add use-vendored-config feature

Without that, I got the following error from cargo:
```
error: target `demo` in package `lvgl` requires the features: `alloc`
Consider enabling them by passing, e.g., `--features="alloc"`
```

.github/workflows/rust.yml

@@ -0,0 +1,33 @@
+name: Rust
+
+on:
+  push:
+    branches: [ master ]
+  pull_request:
+    branches: [ master ]
+
+env:
+  CARGO_TERM_COLOR: always
+  DEP_LV_CONFIG_PATH: /home/runner/work/lvgl-rs/lvgl-rs/examples/include
+
+jobs:
+  build:
+
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Update APT
+        run: sudo apt-get update
+
+      - name: Install SDL2
+        run: sudo apt install libsdl2-dev libsdl2-2.0-0
+
+      - uses: actions/checkout@v2
+        with:
+          submodules: true
+
+      - name: Build
+        run: cargo build --verbose
+
+      - name: Run tests
+        run: cargo test --verbose

Cargo.toml

@@ -1,7 +1,6 @@
 [workspace]
 members = [
     "lvgl",
-    "lvgl-sys",
     "lvgl-codegen",
-    "examples"
+    "lvgl-sys",
 ]

README.md

@@ -1,24 +1,41 @@
-<h1 align="center"> LittlevGL - Open-source Embedded GUI Library in Rust</h1>
+[![SWUbanner](https://raw.githubusercontent.com/vshymanskyy/StandWithUkraine/main/banner2-direct.svg)](https://github.com/vshymanskyy/StandWithUkraine/blob/main/docs/README.md)
 
-![Original LittlevGL demo image](lv_demo.png)
+<h1 align="center"> LVGL - Open-source Embedded GUI Library in Rust</h1>
+
+![Original LVGL demo image](lv_demo.png)
 
 <p align="center">
-LittlevGL provides everything you need to create a Graphical User Interface (GUI) on embedded systems with easy-to-use graphical elements, beautiful visual effects and low memory footprint. 
+LVGL provides everything you need to create a Graphical User Interface (GUI) on embedded systems with easy-to-use graphical elements, beautiful visual effects and low memory footprint. 
 </p>
 <p align="center">
-LittlevGL is compatible with <samp>#![no_std]</samp> environments by default.
+LVGL is compatible with <samp>#![no_std]</samp> environments by default.
 </p>
 
 <h4 align="center">
-<a href="https://lvgl.io/">Official LittlevGL Website </a> &middot; 
+<a href="https://github.com/rafaelcaricio/lvgl-rs-wasm">Rust to WASM demo</a> &middot;
+<a href="https://lvgl.io/">Official LVGL Website </a> &middot;
 <a href="https://github.com/littlevgl/lvgl">C library repository</a> &middot;
-<a href="https://lvgl.io/demos">Live demo</a>
+<a href="https://lvgl.io/demos">Official live demos</a>
 </h4>
 
 ---
 
 ![Rust bindings usage demo code.](demo.png)
 
+## System Build Dependencies
+
+In order to build the `lvgl` project you will need the following system dependencies to be installed:
+
+```
+$ sudo apt install build-essential llvm clang
+```
+
+If you want to build the examples, then you will need to install SDL2 as well.
+
+```
+$ sudo apt install libsdl2-dev
+```
+
 ## Usage
 
 Edit your `Cargo.toml` file dependencies with:
@@ -28,7 +45,7 @@ $ cargo add lvgl
 
 The build requires the environment variable bellow to be set:
 
-- `DEP_LV_CONFIG_PATH`: Path to the directory containing the `lv_conf.h` header file used for configuration of LittlevGL library.
+- `DEP_LV_CONFIG_PATH`: Path to the directory containing the `lv_conf.h` header file used for configuration of LVGL library.
 
 We recommend the `lv_conf.h` file to be in your project's root directory. If so, the command to build your project would be:
 ```shell script
@@ -44,16 +61,22 @@ for `no_std`, so we need to use a workaround to build "lvgl-rs". The mainstrem i
 ```shell
 $ DEP_LV_CONFIG_PATH=`pwd` cargo build -Zfeatures=build_dep
 ```
+### LVGL Global Allocator
 
-#### Requirements / Limitations
-
-LittlevGL C libary do allocate memory dynamically and we need to allocate memory on the heap in the Rust side as well
-([`Box`](https://doc.rust-lang.org/beta/alloc/boxed/struct.Box.html)).
-That is required, so we can safely provide Rust pointers through FFI. For that reason, we do require
-[`alloc`](https://doc.rust-lang.org/alloc/) module to be available.
+A [global allocator](https://doc.rust-lang.org/std/alloc/trait.GlobalAlloc.html) for Rust leveraging the
+[LVGL memory allocator](https://github.com/lvgl/lvgl/blob/master/src/misc/lv_mem.h) is provided, but not enabled 
+by default. Can be enabled by the feature `lvgl_alloc`. This will make all dynamic memory to be allocated by LVGL 
+internal memory manager.
 
 ## Running the demo
 
+**Hint for macOS users**: Before you run the demos you need to make sure you have [libsdl](https://www.libsdl.org)
+installed on your machine. To install it, use HomeBrew:
+
+```shell
+$ brew install sdl2
+```
+
 [This project contains examples that can run in a desktop simulator.](./examples)
 
 First, make sure to pull `lvgl-rs` submodules:
@@ -65,7 +88,7 @@ $ git submodule update
 Then run the `demo` example:
 
 ```shell
-$ DEP_LV_CONFIG_PATH=`pwd`/examples/include cargo run --example demo
+$ DEP_LV_CONFIG_PATH=`pwd`/examples/include cargo run --example demo --features="alloc"
 ```
 
 ## Feature Support

examples/Cargo.toml

@@ -1,32 +0,0 @@
-[package]
-name = "demo"
-version = "0.1.0"
-authors = ["Rafael Caricio <crates@caric.io>"]
-edition = "2018"
-publish = false
-
-[dev-dependencies]
-lvgl = { path = "../lvgl" }
-lvgl-sys = { path = "../lvgl-sys" }
-embedded-graphics = "0.6"
-embedded-graphics-simulator = "0.2.0"
-
-[[example]]
-name = "demo"
-path = "demo.rs"
-
-[[example]]
-name = "bar"
-path = "bar.rs"
-
-[[example]]
-name = "button_click"
-path = "button_click.rs"
-
-[[example]]
-name = "gauge"
-path = "gauge.rs"
-
-[[example]]
-name = "arc"
-path = "arc.rs"

examples/arc.rs

@@ -1,19 +1,42 @@
+use cstr_core::CString;
 use embedded_graphics::pixelcolor::Rgb565;
 use embedded_graphics::prelude::*;
 use embedded_graphics_simulator::{
     OutputSettingsBuilder, SimulatorDisplay, SimulatorEvent, Window,
 };
 use lvgl::style::Style;
-use lvgl::widgets::{Arc, ArcPart, Label, LabelAlign};
-use lvgl::{self, Align, Color, DisplayDriver, Part, State, UI};
+use lvgl::widgets::{Arc, Label, LabelAlign};
+use lvgl::{self, Align, Color, Part, State, UI};
 use lvgl::{LvError, Widget};
 use lvgl_sys;
-use std::sync::{mpsc, Arc as StdArc, Mutex};
-use std::thread::sleep;
-use std::time::Duration;
+use std::time::Instant;
+
+fn mem_info() -> lvgl_sys::lv_mem_monitor_t {
+    let mut info = lvgl_sys::lv_mem_monitor_t {
+        total_size: 0,
+        free_cnt: 0,
+        free_size: 0,
+        free_biggest_size: 0,
+        used_cnt: 0,
+        max_used: 0,
+        used_pct: 0,
+        frag_pct: 0,
+    };
+    unsafe {
+        lvgl_sys::lv_mem_monitor(&mut info as *mut _);
+    }
+    info
+}
 
 fn main() -> Result<(), LvError> {
-    let mut display: SimulatorDisplay<Rgb565> = SimulatorDisplay::new(Size::new(
+    println!("meminfo init: {:?}", mem_info());
+    run_arc_demo()?;
+    println!("meminfo end: {:?}", mem_info());
+    Ok(())
+}
+
+fn run_arc_demo() -> Result<(), LvError> {
+    let display: SimulatorDisplay<Rgb565> = SimulatorDisplay::new(Size::new(
         lvgl_sys::LV_HOR_RES_MAX,
         lvgl_sys::LV_VER_RES_MAX,
     ));
@@ -24,8 +47,7 @@ fn main() -> Result<(), LvError> {
     let mut ui = UI::init()?;
 
     // Implement and register your display:
-    let display_driver = DisplayDriver::new(&mut display);
-    ui.disp_drv_register(display_driver);
+    ui.disp_drv_register(display)?;
 
     // Create screen and widgets
     let mut screen = ui.scr_act()?;
@@ -39,11 +61,11 @@ fn main() -> Result<(), LvError> {
     let mut arc = Arc::new(&mut screen)?;
     arc.set_size(150, 150)?;
     arc.set_align(&mut screen, Align::Center, 0, 10)?;
-    arc.set_start_angle(135, ArcPart::Indicator)?;
-    arc.set_end_angle(135, ArcPart::Indicator)?;
+    arc.set_start_angle(135)?;
+    arc.set_end_angle(135)?;
 
     let mut loading_lbl = Label::new(&mut screen)?;
-    loading_lbl.set_text("Loading...")?;
+    loading_lbl.set_text(CString::new("Loading...").unwrap().as_c_str())?;
     loading_lbl.set_align(&mut arc, Align::OutTopMid, 0, -10)?;
     loading_lbl.set_label_align(LabelAlign::Center)?;
 
@@ -51,38 +73,23 @@ fn main() -> Result<(), LvError> {
     loading_style.set_text_color(State::DEFAULT, Color::from_rgb((0, 0, 0)));
     loading_lbl.add_style(Part::Main, loading_style)?;
 
-    let threaded_ui = StdArc::new(Mutex::new(ui));
-
-    let (stop_ch, read_ch) = mpsc::channel();
-    let closure_ui = threaded_ui.clone();
-    let tick_thr = std::thread::spawn(move || loop {
-        let period = Duration::from_millis(10);
-        closure_ui.lock().unwrap().tick_inc(period);
-
-        sleep(period);
-        if read_ch.try_recv().is_ok() {
-            break;
-        }
-    });
-
     let mut angle = 0;
     let mut forward = true;
-
     let mut i = 0;
+
+    let mut loop_started = Instant::now();
     'running: loop {
         if i > 270 {
             forward = if forward { false } else { true };
             i = 1;
+            println!("meminfo running: {:?}", mem_info());
         }
         angle = if forward { angle + 1 } else { angle - 1 };
-        arc.set_end_angle(angle + 135, ArcPart::Indicator)?;
+        arc.set_end_angle(angle + 135)?;
         i += 1;
 
-        sleep(Duration::from_millis(10));
-
-        threaded_ui.lock().unwrap().task_handler();
-
-        window.update(&display);
+        ui.task_handler();
+        window.update(ui.get_display_ref().unwrap());
 
         for event in window.events() {
             match event {
@@ -90,10 +97,10 @@ fn main() -> Result<(), LvError> {
                 _ => {}
             }
         }
-    }
 
-    stop_ch.send(true).unwrap();
-    tick_thr.join().unwrap();
+        ui.tick_inc(loop_started.elapsed());
+        loop_started = Instant::now();
+    }
 
     Ok(())
 }

examples/bar.rs

@@ -1,18 +1,17 @@
+use cstr_core::CString;
 use embedded_graphics::pixelcolor::Rgb565;
 use embedded_graphics::prelude::*;
 use embedded_graphics_simulator::{
     OutputSettingsBuilder, SimulatorDisplay, SimulatorEvent, Window,
 };
 use lvgl::style::Style;
-use lvgl::widgets::{Bar, BarPart, Label, LabelAlign};
-use lvgl::{self, Align, Animation, Color, DisplayDriver, Event, LvError, Part, State, Widget, UI};
+use lvgl::widgets::{Bar, Label, LabelAlign};
+use lvgl::{self, Align, Animation, Color, Event, LvError, Part, State, Widget, UI};
 use lvgl_sys;
-use std::sync::{mpsc, Arc, Mutex};
-use std::thread::sleep;
-use std::time::Duration;
+use std::time::Instant;
 
 fn main() -> Result<(), LvError> {
-    let mut display: SimulatorDisplay<Rgb565> = SimulatorDisplay::new(Size::new(
+    let display: SimulatorDisplay<Rgb565> = SimulatorDisplay::new(Size::new(
         lvgl_sys::LV_HOR_RES_MAX,
         lvgl_sys::LV_VER_RES_MAX,
     ));
@@ -23,8 +22,7 @@ fn main() -> Result<(), LvError> {
     let mut ui = UI::init()?;
 
     // Implement and register your display:
-    let display_driver = DisplayDriver::new(&mut display);
-    ui.disp_drv_register(display_driver);
+    ui.disp_drv_register(display).unwrap();
 
     // Create screen and widgets
     let mut screen = ui.scr_act()?;
@@ -39,14 +37,17 @@ fn main() -> Result<(), LvError> {
     bar.set_size(175, 20)?;
     bar.set_align(&mut screen, Align::Center, 0, 10)?;
     bar.set_range(0, 100)?;
+    bar.on_event(|_b, _e| {
+        println!("Completed!");
+    })?;
 
     // // Set the indicator style for the bar object
     let mut ind_style = Style::default();
     ind_style.set_bg_color(State::DEFAULT, Color::from_rgb((100, 245, 100)));
-    bar.add_style(BarPart::Indicator, ind_style)?;
+    bar.add_style(Part::All, ind_style)?;
 
     let mut loading_lbl = Label::new(&mut screen)?;
-    loading_lbl.set_text("Loading...")?;
+    loading_lbl.set_text(CString::new("Loading...").unwrap().as_c_str())?;
     loading_lbl.set_align(&mut bar, Align::OutTopMid, 0, -10)?;
     loading_lbl.set_label_align(LabelAlign::Center)?;
 
@@ -54,37 +55,18 @@ fn main() -> Result<(), LvError> {
     loading_style.set_text_color(State::DEFAULT, Color::from_rgb((0, 0, 0)));
     loading_lbl.add_style(Part::Main, loading_style)?;
 
-    let threaded_ui = Arc::new(Mutex::new(ui));
-
-    let (stop_ch, read_ch) = mpsc::channel();
-    let closure_ui = threaded_ui.clone();
-    let tick_thr = std::thread::spawn(move || loop {
-        let period = Duration::from_millis(5);
-        closure_ui.lock().unwrap().tick_inc(period);
-
-        sleep(period);
-        if read_ch.try_recv().is_ok() {
-            break;
-        }
-    });
-
     let mut i = 0;
+    let mut loop_started = Instant::now();
     'running: loop {
         if i > 100 {
             i = 0;
-            threaded_ui
-                .lock()
-                .unwrap()
-                .event_send(&mut loading_lbl, Event::Clicked)?
+            ui.event_send(&mut bar, Event::Clicked)?;
         }
-        bar.set_value(i, Animation::OFF)?;
+        bar.set_value(i, Animation::ON)?;
         i += 1;
 
-        sleep(Duration::from_millis(25));
-
-        threaded_ui.lock().unwrap().task_handler();
-
-        window.update(&display);
+        ui.task_handler();
+        window.update(ui.get_display_ref().unwrap());
 
         for event in window.events() {
             match event {
@@ -92,10 +74,10 @@ fn main() -> Result<(), LvError> {
                 _ => {}
             }
         }
-    }
 
-    stop_ch.send(true).unwrap();
-    tick_thr.join().unwrap();
+        ui.tick_inc(loop_started.elapsed());
+        loop_started = Instant::now();
+    }
 
     Ok(())
 }

examples/button_click.rs

@@ -1,3 +1,4 @@
+use cstr_core::CString;
 use embedded_graphics::pixelcolor::Rgb565;
 use embedded_graphics::prelude::*;
 use embedded_graphics_simulator::{
@@ -5,14 +6,12 @@ use embedded_graphics_simulator::{
 };
 use lvgl::style::Style;
 use lvgl::widgets::{Btn, Label};
-use lvgl::{self, Align, Color, DisplayDriver, Event, LvError, Part, State, Widget, UI};
+use lvgl::{self, Align, Color, Event, LvError, Part, State, Widget, UI};
 use lvgl_sys;
-use std::sync::{mpsc, Arc, Mutex};
-use std::thread::sleep;
-use std::time::Duration;
+use std::time::Instant;
 
 fn main() -> Result<(), LvError> {
-    let mut display: SimulatorDisplay<Rgb565> = SimulatorDisplay::new(Size::new(
+    let display: SimulatorDisplay<Rgb565> = SimulatorDisplay::new(Size::new(
         lvgl_sys::LV_HOR_RES_MAX,
         lvgl_sys::LV_VER_RES_MAX,
     ));
@@ -23,8 +22,7 @@ fn main() -> Result<(), LvError> {
     let mut ui = UI::init()?;
 
     // Implement and register your display:
-    let display_driver = DisplayDriver::new(&mut display);
-    ui.disp_drv_register(display_driver);
+    ui.disp_drv_register(display)?;
 
     // Create screen and widgets
     let mut screen = ui.scr_act()?;
@@ -38,42 +36,29 @@ fn main() -> Result<(), LvError> {
     button.set_align(&mut screen, Align::InLeftMid, 30, 0)?;
     button.set_size(180, 80)?;
     let mut btn_lbl = Label::new(&mut button)?;
-    btn_lbl.set_text("Click me!")?;
+    btn_lbl.set_text(CString::new("Click me!").unwrap().as_c_str())?;
 
     let mut btn_state = false;
     button.on_event(|mut btn, event| {
         if let lvgl::Event::Clicked = event {
             if btn_state {
-                btn_lbl.set_text("Click me!").unwrap();
+                let nt = CString::new("Click me!").unwrap();
+                btn_lbl.set_text(nt.as_c_str()).unwrap();
             } else {
-                btn_lbl.set_text("Clicked!").unwrap();
+                let nt = CString::new("Clicked!").unwrap();
+                btn_lbl.set_text(nt.as_c_str()).unwrap();
             }
             btn_state = !btn_state;
-            println!("Clicked!");
+            println!("Clicked! Inner..");
             btn.toggle().unwrap();
         }
     })?;
 
-    let threaded_ui = Arc::new(Mutex::new(ui));
-
-    let (stop_ch, read_ch) = mpsc::channel();
-    let closure_ui = threaded_ui.clone();
-    let tick_thr = std::thread::spawn(move || loop {
-        let period = Duration::from_millis(5);
-
-        // Needs to be called periodically for LittlevGL internal timing calculations.
-        closure_ui.lock().unwrap().tick_inc(period);
-
-        sleep(period);
-        if read_ch.try_recv().is_ok() {
-            break;
-        }
-    });
-
+    let mut loop_started = Instant::now();
     'running: loop {
-        threaded_ui.lock().unwrap().task_handler();
+        ui.task_handler();
+        window.update(ui.get_display_ref().unwrap());
 
-        window.update(&display);
         for event in window.events() {
             match event {
                 SimulatorEvent::MouseButtonUp {
@@ -82,21 +67,16 @@ fn main() -> Result<(), LvError> {
                 } => {
                     println!("Clicked on: {:?}", point);
                     // Send a event to the button directly
-                    threaded_ui
-                        .lock()
-                        .unwrap()
-                        .event_send(&mut button, Event::Clicked)?;
+                    ui.event_send(&mut button, Event::Clicked)?;
                 }
                 SimulatorEvent::Quit => break 'running,
                 _ => {}
             }
         }
 
-        sleep(Duration::from_millis(5));
+        ui.tick_inc(loop_started.elapsed());
+        loop_started = Instant::now();
     }
 
-    stop_ch.send(true).unwrap();
-    tick_thr.join().unwrap();
-
     Ok(())
 }

examples/demo.rs

@@ -1,3 +1,4 @@
+use cstr_core::CString;
 use embedded_graphics::pixelcolor::Rgb565;
 use embedded_graphics::prelude::*;
 use embedded_graphics_simulator::{
@@ -8,12 +9,11 @@ use lvgl::style::Style;
 use lvgl::widgets::{Label, LabelAlign};
 use lvgl::{Align, Color, LvError, Part, State, Widget, UI};
 use lvgl_sys;
-use std::sync::{mpsc, Arc, Mutex};
 use std::thread::sleep;
-use std::time::Duration;
+use std::time::{Duration, Instant};
 
 fn main() -> Result<(), LvError> {
-    let mut display: SimulatorDisplay<Rgb565> = SimulatorDisplay::new(Size::new(
+    let display: SimulatorDisplay<Rgb565> = SimulatorDisplay::new(Size::new(
         lvgl_sys::LV_HOR_RES_MAX,
         lvgl_sys::LV_VER_RES_MAX,
     ));
@@ -24,15 +24,11 @@ fn main() -> Result<(), LvError> {
     let mut ui = UI::init()?;
 
     // Implement and register your display:
-    let display_driver = lvgl::DisplayDriver::new(&mut display);
-    ui.disp_drv_register(display_driver);
+    ui.disp_drv_register(display).unwrap();
 
     // Create screen and widgets
     let mut screen = ui.scr_act()?;
 
-    let font_roboto_28 = unsafe { &lvgl_sys::lv_theme_get_font_normal() };
-    let font_noto_sans_numeric_28 = unsafe { &noto_sans_numeric_80 };
-
     let mut screen_style = Style::default();
     screen_style.set_bg_color(State::DEFAULT, Color::from_rgb((0, 0, 0)));
     screen_style.set_radius(State::DEFAULT, 0);
@@ -44,7 +40,7 @@ fn main() -> Result<(), LvError> {
     style_time.set_text_color(State::DEFAULT, Color::from_rgb((255, 255, 255)));
     time.add_style(Part::Main, style_time)?;
     time.set_align(&mut screen, Align::Center, 0, 0)?;
-    time.set_text("20:46")?;
+    time.set_text(CString::new("20:46").unwrap().as_c_str())?;
     time.set_width(240)?;
     time.set_height(240)?;
 
@@ -52,7 +48,7 @@ fn main() -> Result<(), LvError> {
     bt.set_width(50)?;
     bt.set_height(80)?;
     bt.set_recolor(true)?;
-    bt.set_text("#5794f2 \u{F293}#")?;
+    bt.set_text(CString::new("#5794f2 \u{F293}#").unwrap().as_c_str())?;
     bt.set_label_align(LabelAlign::Left)?;
     bt.set_align(&mut screen, Align::InTopLeft, 0, 0)?;
 
@@ -60,37 +56,22 @@ fn main() -> Result<(), LvError> {
     power.set_recolor(true)?;
     power.set_width(80)?;
     power.set_height(20)?;
-    power.set_text("#fade2a 20%#")?;
+    power.set_text(CString::new("#fade2a 20%#").unwrap().as_c_str())?;
     power.set_label_align(LabelAlign::Right)?;
     power.set_align(&mut screen, Align::InTopRight, 0, 0)?;
 
-    let threaded_ui = Arc::new(Mutex::new(ui));
-
-    let (stop_ch, read_ch) = mpsc::channel();
-    let closure_ui = threaded_ui.clone();
-    let tick_thr = std::thread::spawn(move || loop {
-        let period = Duration::from_millis(250);
-        closure_ui.lock().unwrap().tick_inc(period);
-
-        sleep(period);
-        if read_ch.try_recv().is_ok() {
-            break;
-        }
-    });
-
     let mut i = 0;
+    let mut loop_started = Instant::now();
     'running: loop {
         if i > 59 {
             i = 0;
         }
-        time.set_text(format!("21:{:02}", i).as_str())?;
+        let val = CString::new(format!("21:{:02}", i)).unwrap();
+        time.set_text(&val)?;
         i = 1 + i;
 
-        sleep(Duration::from_secs(1));
-
-        threaded_ui.lock().unwrap().task_handler();
-
-        window.update(&display);
+        ui.task_handler();
+        window.update(ui.get_display_ref().unwrap());
 
         for event in window.events() {
             match event {
@@ -98,15 +79,16 @@ fn main() -> Result<(), LvError> {
                 _ => {}
             }
         }
-    }
+        sleep(Duration::from_secs(1));
 
-    stop_ch.send(true).unwrap();
-    tick_thr.join().unwrap();
+        ui.tick_inc(loop_started.elapsed());
+        loop_started = Instant::now();
+    }
 
     Ok(())
 }
 
-// Reference to native font for LittlevGL, defined in the file: "fonts_noto_sans_numeric_80.c"
+// Reference to native font for LVGL, defined in the file: "fonts_noto_sans_numeric_80.c"
 // TODO: Create a macro for defining a safe wrapper for fonts.
 // Maybe sometihng like:
 //

examples/gauge.rs

@@ -4,15 +4,13 @@ use embedded_graphics_simulator::{
     OutputSettingsBuilder, SimulatorDisplay, SimulatorEvent, Window,
 };
 use lvgl::style::{Opacity, Style};
-use lvgl::widgets::{Gauge, GaugePart};
-use lvgl::{self, Align, Color, DisplayDriver, LvError, Part, State, Widget, UI};
+use lvgl::widgets::Gauge;
+use lvgl::{self, Align, Color, LvError, Part, State, Widget, UI};
 use lvgl_sys;
-use std::sync::{mpsc, Arc, Mutex};
-use std::thread::sleep;
-use std::time::Duration;
+use std::time::Instant;
 
 fn main() -> Result<(), LvError> {
-    let mut display: SimulatorDisplay<Rgb565> = SimulatorDisplay::new(Size::new(
+    let display: SimulatorDisplay<Rgb565> = SimulatorDisplay::new(Size::new(
         lvgl_sys::LV_HOR_RES_MAX,
         lvgl_sys::LV_VER_RES_MAX,
     ));
@@ -23,8 +21,7 @@ fn main() -> Result<(), LvError> {
     let mut ui = UI::init()?;
 
     // Implement and register your display:
-    let display_driver = DisplayDriver::new(&mut display);
-    ui.disp_drv_register(display_driver);
+    ui.disp_drv_register(display)?;
 
     // Create screen and widgets
     let mut screen = ui.scr_act()?;
@@ -53,31 +50,18 @@ fn main() -> Result<(), LvError> {
     gauge_style.set_scale_end_border_width(State::DEFAULT, 4);
 
     let mut gauge = Gauge::new(&mut screen)?;
-    gauge.add_style(GaugePart::Main, gauge_style)?;
+    gauge.add_style(Part::Main, gauge_style)?;
     gauge.set_align(&mut screen, Align::Center, 0, 0)?;
     gauge.set_value(0, 50)?;
 
-    let threaded_ui = Arc::new(Mutex::new(ui));
-
-    let (stop_ch, read_ch) = mpsc::channel();
-    let closure_ui = threaded_ui.clone();
-    let tick_thr = std::thread::spawn(move || loop {
-        let period = Duration::from_millis(5);
-
-        // Needs to be called periodically for LittlevGL internal timing calculations.
-        closure_ui.lock().unwrap().tick_inc(period);
-
-        sleep(period);
-        if read_ch.try_recv().is_ok() {
-            break;
-        }
-    });
-
     let mut i = 0;
+    let mut loop_started = Instant::now();
     'running: loop {
-        threaded_ui.lock().unwrap().task_handler();
+        gauge.set_value(0, i)?;
+
+        ui.task_handler();
+        window.update(ui.get_display_ref().unwrap());
 
-        window.update(&display);
         for event in window.events() {
             match event {
                 SimulatorEvent::MouseButtonUp {
@@ -91,18 +75,15 @@ fn main() -> Result<(), LvError> {
             }
         }
 
-        sleep(Duration::from_millis(25));
-        gauge.set_value(0, i)?;
-
         if i > 99 {
             i = 0;
         } else {
             i = i + 1;
         }
-    }
 
-    stop_ch.send(true).unwrap();
-    tick_thr.join().unwrap();
+        ui.tick_inc(loop_started.elapsed());
+        loop_started = Instant::now();
+    }
 
     Ok(())
 }

examples/include/lv_conf.h

@@ -80,7 +80,7 @@ typedef int16_t lv_coord_t;
 #define LV_MEM_CUSTOM      0
 #if LV_MEM_CUSTOM == 0
 /* Size of the memory used by `lv_mem_alloc` in bytes (>= 2kB)*/
-#  define LV_MEM_SIZE    (32U * 1024U)
+#  define LV_MEM_SIZE    (1048576U) // 1Mb
 
 /* Complier prefix for a big array declaration */
 #  define LV_MEM_ATTR

lvgl-codegen/Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "lvgl-codegen"
-version = "0.3.0"
+version = "0.5.2"
 description = "Code generation based on LVGL source code"
 authors = ["Rafael Caricio <crates.lvgl@caric.io>"]
 readme = "README.md"
@@ -9,11 +9,10 @@ license = "MIT"
 repository = "https://github.com/rafaelcaricio/lvgl-rs"
 
 [dependencies]
-regex = "1.3.9"
-quote = "1.0.7"
+regex = "1.4.3"
+quote = "1.0.9"
 lazy_static = "1.4.0"
-itertools = "0.9.0"
-proc-macro2 = "1.0.18"
+proc-macro2 = "1.0.27"
 Inflector = "0.11.4"
-syn = { version = "1.0.31", features = ["full"]}
+syn = { version = "1.0.72", features = ["full"]}
 

lvgl-codegen/src/lib.rs

@@ -1,12 +1,11 @@
 use inflector::cases::pascalcase::to_pascal_case;
 use lazy_static::lazy_static;
 use proc_macro2::{Ident, TokenStream};
-use quote::format_ident;
 use quote::quote;
+use quote::{format_ident, ToTokens};
 use regex::Regex;
 use std::collections::HashMap;
 use std::error::Error;
-use syn::export::ToTokens;
 use syn::{FnArg, ForeignItem, ForeignItemFn, Item, ReturnType};
 
 type CGResult<T> = Result<T, Box<dyn Error>>;
@@ -19,7 +18,7 @@ lazy_static! {
         ("i32", "i32"),
         ("u8", "u8"),
         ("bool", "bool"),
-        ("* const cty :: c_char", "&str"),
+        ("* const cty :: c_char", "_"),
     ]
     .iter()
     .cloned()
@@ -50,7 +49,7 @@ impl Rusty for LvWidget {
 
     fn code(&self, _parent: &Self::Parent) -> WrapperResult<TokenStream> {
         // We don't generate for the generic Obj
-        if self.name.eq("obj") {
+        if self.name.as_str().eq("obj") {
             return Err(WrapperError::Skip);
         }
 
@@ -79,7 +78,7 @@ impl LvFunc {
     }
 
     pub fn is_method(&self) -> bool {
-        if self.args.len() > 0 {
+        if !self.args.is_empty() {
             let first_arg = &self.args[0];
             return first_arg.typ.literal_name.contains("lv_obj_t");
         }
@@ -97,19 +96,24 @@ impl Rusty for LvFunc {
         let original_func_name = format_ident!("{}", self.name.as_str());
 
         // generate constructor
-        if new_name.eq("create") {
+        if new_name.as_str().eq("create") {
             return Ok(quote! {
+
                 pub fn new<C>(parent: &mut C) -> crate::LvResult<Self>
                 where
                     C: crate::NativeObject,
                 {
                     unsafe {
                         let ptr = lvgl_sys::#original_func_name(parent.raw()?.as_mut(), core::ptr::null_mut());
-                        let raw = core::ptr::NonNull::new(ptr)?;
-                        let core = <crate::Obj as crate::Widget>::from_raw(raw);
-                        Ok(Self { core })
+                        if let Some(raw) = core::ptr::NonNull::new(ptr) {
+                            let core = <crate::Obj as crate::Widget>::from_raw(raw);
+                            Ok(Self { core })
+                        } else {
+                            Err(crate::LvError::InvalidReference)
+                        }
                     }
                 }
+
             });
         }
 
@@ -259,17 +263,11 @@ impl LvArg {
     }
 
     pub fn get_processing(&self) -> TokenStream {
-        let ident = self.get_name_ident();
         // TODO: A better way to handle this, instead of `is_sometype()`, is using the Rust
         //       type system itself.
-        if self.typ.is_str() {
-            quote! {
-                let #ident = cstr_core::CString::new(#ident)?;
-            }
-        } else {
-            // No need to pre-process this type of argument
-            quote! {}
-        }
+
+        // No need to pre-process this type of argument
+        quote! {}
     }
 
     pub fn get_value_usage(&self) -> TokenStream {
@@ -305,21 +303,21 @@ impl Rusty for LvArg {
 #[derive(Clone)]
 pub struct LvType {
     literal_name: String,
-    r_type: Option<Box<syn::Type>>,
+    _r_type: Option<Box<syn::Type>>,
 }
 
 impl LvType {
     pub fn new(literal_name: String) -> Self {
         Self {
             literal_name,
-            r_type: None,
+            _r_type: None,
         }
     }
 
     pub fn from(r_type: Box<syn::Type>) -> Self {
         Self {
             literal_name: r_type.to_token_stream().to_string(),
-            r_type: Some(r_type),
+            _r_type: Some(r_type),
         }
     }
 
@@ -339,7 +337,7 @@ impl Rusty for LvType {
         match TYPE_MAPPINGS.get(self.literal_name.as_str()) {
             Some(name) => {
                 let val = if self.is_str() {
-                    quote!(&str)
+                    quote!(&cstr_core::CStr)
                 } else {
                     let ident = format_ident!("{}", name);
                     quote!(#ident)
@@ -375,7 +373,7 @@ impl CodeGen {
         &self.widgets
     }
 
-    fn extract_widgets(functions: &Vec<LvFunc>) -> CGResult<Vec<LvWidget>> {
+    fn extract_widgets(functions: &[LvFunc]) -> CGResult<Vec<LvWidget>> {
         let widget_names = Self::get_widget_names(functions);
 
         let widgets = functions.iter().fold(HashMap::new(), |mut ws, f| {
@@ -396,25 +394,25 @@ impl CodeGen {
             ws
         });
 
-        Ok(widgets.values().map(|v| v.clone()).collect())
+        Ok(widgets.values().cloned().collect())
     }
 
-    fn get_widget_names(functions: &Vec<LvFunc>) -> Vec<String> {
+    fn get_widget_names(functions: &[LvFunc]) -> Vec<String> {
         let reg = format!("^{}([^_]+)_create$", LIB_PREFIX);
         let create_func = Regex::new(reg.as_str()).unwrap();
 
         functions
             .iter()
             .filter(|e| create_func.is_match(e.name.as_str()) && e.args.len() == 2)
-            .filter_map(|f| {
-                Some(String::from(
+            .map(|f| {
+                String::from(
                     create_func
                         .captures(f.name.as_str())
                         .unwrap()
                         .get(1)
                         .unwrap()
                         .as_str(),
-                ))
+                )
             })
             .collect::<Vec<_>>()
     }
@@ -573,8 +571,8 @@ mod test {
 
         let code = label_set_text.code(&parent_widget).unwrap();
         let expected_code = quote! {
-            pub fn set_text(&mut self, text: &str) -> crate::LvResult<()> {
-                let text = cstr_core::CString::new(text)?;
+
+            pub fn set_text(&mut self, text: &cstr_core::CStr) -> crate::LvResult<()> {
                 unsafe {
                     lvgl_sys::lv_label_set_text(
                         self.core.raw()?.as_mut(),
@@ -583,6 +581,7 @@ mod test {
                 }
                 Ok(())
             }
+
         };
 
         assert_eq!(code.to_string(), expected_code.to_string());
@@ -636,11 +635,15 @@ mod test {
                 where
                     C: crate::NativeObject,
                 {
+
                     unsafe {
                         let ptr = lvgl_sys::lv_arc_create(parent.raw()?.as_mut(), core::ptr::null_mut());
-                        let raw = core::ptr::NonNull::new(ptr)?;
-                        let core = <crate::Obj as crate::Widget>::from_raw(raw);
-                        Ok(Self { core })
+                        if let Some(raw) = core::ptr::NonNull::new(ptr) {
+                            let core = <crate::Obj as crate::Widget>::from_raw(raw);
+                            Ok(Self { core })
+                        } else {
+                            Err(crate::LvError::InvalidReference)
+                        }
                     }
                 }
             }

lvgl-sys/Cargo.toml

@@ -1,7 +1,7 @@
 [package]
 name = "lvgl-sys"
-description = "Raw bindings to the LittlevGL C library."
-version = "0.3.0"
+description = "Raw bindings to the LVGL C library."
+version = "0.5.2"
 authors = ["Rafael Caricio <crates.lvgl-sys@caric.io>"]
 edition = "2018"
 license = "MIT"
@@ -20,5 +20,8 @@ name = "lvgl_sys"
 cty = "0.2.1"
 
 [build-dependencies]
-cc = "1.0.50"
-bindgen = "0.54.0"
+cc = "1.0.68"
+bindgen = "0.59.2"
+
+[features]
+use-vendored-config = []

lvgl-sys/README.md

@@ -5,7 +5,7 @@ Rust raw bindings for LittlevGL library.
 
 Build requires environment variables to be set:
 
-- `DEP_LV_CONFIG_PATH`: Path to the directory containing the `lv_conf.h` header file used for configuration of LittlevGL library.
+- `DEP_LV_CONFIG_PATH`: Path to the directory containing the `lv_conf.h` header file used for configuration of LVGL library.
 
 We recommend the `lv_conf.h` file to be in your project's root directory. If so, the command to build your project would be:
 ```shell script

lvgl-sys/build.rs

@@ -4,36 +4,50 @@ use std::{env, path::Path, path::PathBuf};
 static CONFIG_NAME: &str = "DEP_LV_CONFIG_PATH";
 
 fn main() {
-    let project_dir = PathBuf::from(env::var("CARGO_MANIFEST_DIR").unwrap())
-        .canonicalize()
-        .unwrap();
+    let project_dir = canonicalize(PathBuf::from(env::var("CARGO_MANIFEST_DIR").unwrap()));
     let shims_dir = project_dir.join("shims");
     let vendor = project_dir.join("vendor");
     let vendor_src = vendor.join("lvgl").join("src");
 
     let lv_config_dir = {
-        let raw_path = env::var(CONFIG_NAME).unwrap_or_else(|_| {
-            panic!(
-                "The environment variable {} is required to be defined",
-                CONFIG_NAME
-            );
-        });
-        let conf_path = PathBuf::from(raw_path);
+        let conf_path = env::var(CONFIG_NAME)
+            .map(PathBuf::from)
+            .unwrap_or_else(|_| {
+                match std::env::var("DOCS_RS") {
+                    Ok(_) => {
+                        // We've detected that we are building for docs.rs
+                        // so let's use the vendored `lv_conf.h` file.
+                        vendor.join("include")
+                    }
+                    Err(_) => {
+                        #[cfg(not(feature = "use-vendored-config"))]
+                        panic!(
+                            "The environment variable {} is required to be defined",
+                            CONFIG_NAME
+                        );
+
+                        #[cfg(feature = "use-vendored-config")]
+                        vendor.join("include")
+                    }
+                }
+            });
 
         if !conf_path.exists() {
-            panic!(format!(
-                "Directory referenced by {} needs to exist",
+            panic!(
+                "Directory {} referenced by {} needs to exist",
+                conf_path.to_string_lossy(),
                 CONFIG_NAME
-            ));
+            );
         }
         if !conf_path.is_dir() {
-            panic!(format!("{} needs to be a directory", CONFIG_NAME));
+            panic!("{} needs to be a directory", CONFIG_NAME);
         }
         if !conf_path.join("lv_conf.h").exists() {
-            panic!(format!(
-                "Directory referenced by {} needs to contain a file called lv_conf.h",
+            panic!(
+                "Directory {} referenced by {} needs to contain a file called lv_conf.h",
+                conf_path.to_string_lossy(),
                 CONFIG_NAME
-            ));
+            );
         }
 
         println!(
@@ -58,29 +72,62 @@ fn main() {
     cfg.define("LV_CONF_INCLUDE_SIMPLE", Some("1"))
         .include(&vendor_src)
         .include(&vendor)
-        .file("string.c")
         .warnings(false)
         .include(&lv_config_dir)
         .compile("lvgl");
 
-    let cc_args = [
+    let mut cc_args = vec![
         "-DLV_CONF_INCLUDE_SIMPLE=1",
         "-I",
         lv_config_dir.to_str().unwrap(),
         "-I",
         vendor.to_str().unwrap(),
+        "-fvisibility=default",
     ];
 
+    // Set correct target triple for bindgen when cross-compiling
+    let target = env::var("TARGET").expect("Cargo build scripts always have TARGET");
+    let host = env::var("HOST").expect("Cargo build scripts always have HOST");
+    if target != host {
+        cc_args.push("-target");
+        cc_args.push(target.as_str());
+    }
+
+    let mut additional_args = Vec::new();
+    if target.ends_with("emscripten") {
+        if let Ok(em_path) = env::var("EMSDK") {
+            additional_args.push("-I".to_string());
+            additional_args.push(format!(
+                "{}/upstream/emscripten/system/include/libc",
+                em_path
+            ));
+            additional_args.push("-I".to_string());
+            additional_args.push(format!(
+                "{}/upstream/emscripten/system/lib/libc/musl/arch/emscripten",
+                em_path
+            ));
+            additional_args.push("-I".to_string());
+            additional_args.push(format!(
+                "{}/upstream/emscripten/system/include/SDL",
+                em_path
+            ));
+        }
+    }
+
     let out_path = PathBuf::from(env::var("OUT_DIR").unwrap());
-    bindgen::Builder::default()
+    let bindings = bindgen::Builder::default()
         .header(shims_dir.join("lvgl_sys.h").to_str().unwrap())
+        .generate_comments(false)
         .layout_tests(false)
         .use_core()
         .rustfmt_bindings(true)
         .ctypes_prefix("cty")
         .clang_args(&cc_args)
+        .clang_args(&additional_args)
         .generate()
-        .expect("Unable to generate bindings")
+        .expect("Unable to generate bindings");
+
+    bindings
         .write_to_file(out_path.join("bindings.rs"))
         .expect("Can't write bindings!");
 }
@@ -96,3 +143,10 @@ fn add_c_files(build: &mut cc::Build, path: impl AsRef<Path>) {
         }
     }
 }
+
+fn canonicalize(path: impl AsRef<Path>) -> PathBuf {
+    let canonicalized = path.as_ref().canonicalize().unwrap();
+    let canonicalized = &*canonicalized.to_string_lossy();
+
+    PathBuf::from(canonicalized.strip_prefix(r"\\?\").unwrap_or(canonicalized))
+}

lvgl-sys/src/lib.rs

@@ -11,6 +11,8 @@ pub fn _bindgen_raw_src() -> &'static str {
     include_str!(concat!(env!("OUT_DIR"), "/bindings.rs"))
 }
 
+mod string_impl;
+
 #[cfg(test)]
 mod tests {
     use super::*;
@@ -20,11 +22,11 @@ mod tests {
         unsafe {
             lv_init();
 
-            let horizontal_resolution = lv_disp_get_hor_res(std::ptr::null_mut());
-            assert_eq!(horizontal_resolution, 480);
+            let horizontal_resolution = lv_disp_get_hor_res(core::ptr::null_mut());
+            assert_eq!(horizontal_resolution, LV_HOR_RES_MAX as i16);
 
-            let vertical_resolution = lv_disp_get_ver_res(std::ptr::null_mut());
-            assert_eq!(vertical_resolution, 320);
+            let vertical_resolution = lv_disp_get_ver_res(core::ptr::null_mut());
+            assert_eq!(vertical_resolution, LV_VER_RES_MAX as i16);
         }
     }
 }

lvgl-sys/src/string_impl.rs

@@ -0,0 +1,159 @@
+// MIT License
+//
+// Copyright (c) 2018 Redox OS
+//
+// Permission is hereby granted, free of charge, to any person obtaining a copy
+// of this software and associated documentation files (the "Software"), to deal
+// in the Software without restriction, including without limitation the rights
+// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+// copies of the Software, and to permit persons to whom the Software is
+// furnished to do so, subject to the following conditions:
+//
+// The above copyright notice and this permission notice shall be included in all
+// copies or substantial portions of the Software.
+//
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+// SOFTWARE.
+
+use core::{ptr, usize};
+use cty::*;
+
+#[no_mangle]
+pub unsafe extern "C" fn strchr(mut s: *const c_char, c: c_int) -> *mut c_char {
+    let c = c as c_char;
+    while *s != 0 {
+        if *s == c {
+            return s as *mut c_char;
+        }
+        s = s.offset(1);
+    }
+    ptr::null_mut()
+}
+
+#[no_mangle]
+pub unsafe extern "C" fn strcmp(s1: *const c_char, s2: *const c_char) -> c_int {
+    strncmp(s1, s2, usize::MAX)
+}
+
+#[no_mangle]
+pub unsafe extern "C" fn strcoll(s1: *const c_char, s2: *const c_char) -> c_int {
+    // relibc has no locale stuff (yet)
+    strcmp(s1, s2)
+}
+
+#[no_mangle]
+pub unsafe extern "C" fn strcpy(dst: *mut c_char, src: *const c_char) -> *mut c_char {
+    let mut i = 0;
+
+    loop {
+        let byte = *src.offset(i);
+        *dst.offset(i) = byte;
+
+        if byte == 0 {
+            break;
+        }
+
+        i += 1;
+    }
+
+    dst
+}
+
+#[no_mangle]
+pub unsafe extern "C" fn strlen(s: *const c_char) -> size_t {
+    strnlen(s, usize::MAX)
+}
+
+#[no_mangle]
+pub unsafe extern "C" fn strnlen(s: *const c_char, size: size_t) -> size_t {
+    let mut i = 0;
+    while i < size {
+        if *s.add(i) == 0 {
+            break;
+        }
+        i += 1;
+    }
+    i as size_t
+}
+
+#[no_mangle]
+pub unsafe extern "C" fn strnlen_s(s: *const c_char, size: size_t) -> size_t {
+    if s.is_null() {
+        0
+    } else {
+        strnlen(s, size)
+    }
+}
+
+#[no_mangle]
+pub unsafe extern "C" fn strcat(s1: *mut c_char, s2: *const c_char) -> *mut c_char {
+    strncat(s1, s2, usize::MAX)
+}
+
+#[no_mangle]
+pub unsafe extern "C" fn strncat(s1: *mut c_char, s2: *const c_char, n: size_t) -> *mut c_char {
+    let len = strlen(s1 as *const c_char);
+    let mut i = 0;
+    while i < n {
+        let b = *s2.add(i);
+        if b == 0 {
+            break;
+        }
+
+        *s1.add(len + i) = b;
+        i += 1;
+    }
+    *s1.add(len + i) = 0;
+
+    s1
+}
+
+#[no_mangle]
+pub unsafe extern "C" fn strncmp(s1: *const c_char, s2: *const c_char, n: size_t) -> c_int {
+    let s1 = core::slice::from_raw_parts(s1 as *const c_uchar, n);
+    let s2 = core::slice::from_raw_parts(s2 as *const c_uchar, n);
+
+    for (&a, &b) in s1.iter().zip(s2.iter()) {
+        let val = (a as c_int) - (b as c_int);
+        if a != b || a == 0 {
+            return val;
+        }
+    }
+
+    0
+}
+
+#[no_mangle]
+pub unsafe extern "C" fn strncpy(dst: *mut c_char, src: *const c_char, n: size_t) -> *mut c_char {
+    let mut i = 0;
+
+    while *src.add(i) != 0 && i < n {
+        *dst.add(i) = *src.add(i);
+        i += 1;
+    }
+
+    for i in i..n {
+        *dst.add(i) = 0;
+    }
+
+    dst
+}
+
+#[no_mangle]
+pub unsafe extern "C" fn strrchr(s: *const c_char, c: c_int) -> *mut c_char {
+    let len = strlen(s) as isize;
+    let c = c as c_char;
+    let mut i = len - 1;
+    while i >= 0 {
+        if *s.offset(i) == c {
+            return s.offset(i) as *mut c_char;
+        }
+        i -= 1;
+    }
+    ptr::null_mut()
+}

lvgl-sys/string.c

@@ -1,83 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0
-/*
- *  linux/lib/string.c
- *
- *  Copyright (C) 1991, 1992  Linus Torvalds
- */
-
-#include <string.h>
-
-size_t strspn(const char *s, const char *accept)
-{
-    const char *p;
-    const char *a;
-    size_t count = 0;
-
-    for (p = s; *p != '\0'; ++p) {
-        for (a = accept; *a != '\0'; ++a) {
-            if (*p == *a)
-                break;
-        }
-        if (*a == '\0')
-            return count;
-        ++count;
-    }
-    return count;
-}
-
-size_t strcspn(const char *s, const char *reject)
-{
-    const char *p;
-    const char *r;
-    size_t count = 0;
-
-    for (p = s; *p != '\0'; ++p) {
-        for (r = reject; *r != '\0'; ++r) {
-            if (*p == *r)
-                return count;
-        }
-        ++count;
-    }
-    return count;
-}
-
-size_t strlen(const char *s)
-{
-    const char *sc;
-
-    for (sc = s; *sc != '\0'; ++sc)
-        /* nothing */;
-    return sc - s;
-}
-
-char *strchr(const char *s, int c)
-{
-    for (; *s != (char)c; ++s)
-        if (*s == '\0')
-            return NULL;
-    return (char *)s;
-}
-
-char *strcpy(char *dest, const char *src)
-{
-    char *tmp = dest;
-
-    while ((*dest++ = *src++) != '\0')
-        /* nothing */;
-    return tmp;
-}
-
-int strcmp(const char *cs, const char *ct)
-{
-    unsigned char c1, c2;
-
-    while (1) {
-        c1 = *cs++;
-        c2 = *ct++;
-        if (c1 != c2)
-            return c1 < c2 ? -1 : 1;
-        if (!c1)
-            break;
-    }
-    return 0;
-}

lvgl-sys/vendor/include/lv_conf.h

@@ -0,0 +1,701 @@
+/**
+ * @file lv_conf.h
+ *
+ */
+
+/*
+ * COPY THIS FILE AS `lv_conf.h` NEXT TO the `lvgl` FOLDER
+ */
+
+#if 1 /*Set it to "1" to enable content*/
+
+#ifndef LV_CONF_H
+#define LV_CONF_H
+/* clang-format off */
+
+#include <stdint.h>
+
+/*====================
+   Graphical settings
+ *====================*/
+
+/* Maximal horizontal and vertical resolution to support by the library.*/
+#define LV_HOR_RES_MAX          (240)
+#define LV_VER_RES_MAX          (240)
+
+/* Color depth:
+ * - 1:  1 byte per pixel
+ * - 8:  RGB332
+ * - 16: RGB565
+ * - 32: ARGB8888
+ */
+#define LV_COLOR_DEPTH     16
+
+/* Swap the 2 bytes of RGB565 color.
+ * Useful if the display has a 8 bit interface (e.g. SPI)*/
+#define LV_COLOR_16_SWAP   0
+
+/* 1: Enable screen transparency.
+ * Useful for OSD or other overlapping GUIs.
+ * Requires `LV_COLOR_DEPTH = 32` colors and the screen's style should be modified: `style.body.opa = ...`*/
+#define LV_COLOR_SCREEN_TRANSP    0
+
+/*Images pixels with this color will not be drawn (with chroma keying)*/
+#define LV_COLOR_TRANSP    LV_COLOR_LIME         /*LV_COLOR_LIME: pure green*/
+
+/* Enable anti-aliasing (lines, and radiuses will be smoothed) */
+#define LV_ANTIALIAS        1
+
+/* Default display refresh period.
+ * Can be changed in the display driver (`lv_disp_drv_t`).*/
+#define LV_DISP_DEF_REFR_PERIOD      30      /*[ms]*/
+
+/* Dot Per Inch: used to initialize default sizes.
+ * E.g. a button with width = LV_DPI / 2 -> half inch wide
+ * (Not so important, you can adjust it to modify default sizes and spaces)*/
+#define LV_DPI              130     /*[px]*/
+
+/* The the real width of the display changes some default values:
+ * default object sizes, layout of examples, etc.
+ * According to the width of the display (hor. res. / dpi)
+ * the displays fall in 4 categories.
+ * The 4th is extra large which has no upper limit so not listed here
+ * The upper limit of the categories are set below in 0.1 inch unit.
+ */
+#define LV_DISP_SMALL_LIMIT  30
+#define LV_DISP_MEDIUM_LIMIT 50
+#define LV_DISP_LARGE_LIMIT  70
+
+/* Type of coordinates. Should be `int16_t` (or `int32_t` for extreme cases) */
+typedef int16_t lv_coord_t;
+
+/*=========================
+   Memory manager settings
+ *=========================*/
+
+/* LittelvGL's internal memory manager's settings.
+ * The graphical objects and other related data are stored here. */
+
+/* 1: use custom malloc/free, 0: use the built-in `lv_mem_alloc` and `lv_mem_free` */
+#define LV_MEM_CUSTOM      0
+#if LV_MEM_CUSTOM == 0
+/* Size of the memory used by `lv_mem_alloc` in bytes (>= 2kB)*/
+#  define LV_MEM_SIZE    (32U * 1024U)
+
+/* Complier prefix for a big array declaration */
+#  define LV_MEM_ATTR
+
+/* Set an address for the memory pool instead of allocating it as an array.
+ * Can be in external SRAM too. */
+#  define LV_MEM_ADR          0
+
+/* Automatically defrag. on free. Defrag. means joining the adjacent free cells. */
+#  define LV_MEM_AUTO_DEFRAG  1
+#else       /*LV_MEM_CUSTOM*/
+#  define LV_MEM_CUSTOM_INCLUDE <stdlib.h>   /*Header for the dynamic memory function*/
+#  define LV_MEM_CUSTOM_ALLOC   malloc       /*Wrapper to malloc*/
+#  define LV_MEM_CUSTOM_FREE    free         /*Wrapper to free*/
+#endif     /*LV_MEM_CUSTOM*/
+
+/* Garbage Collector settings
+ * Used if lvgl is binded to higher level language and the memory is managed by that language */
+#define LV_ENABLE_GC 0
+#if LV_ENABLE_GC != 0
+#  define LV_GC_INCLUDE "gc.h"                           /*Include Garbage Collector related things*/
+#  define LV_MEM_CUSTOM_REALLOC   your_realloc           /*Wrapper to realloc*/
+#  define LV_MEM_CUSTOM_GET_SIZE  your_mem_get_size      /*Wrapper to lv_mem_get_size*/
+#endif /* LV_ENABLE_GC */
+
+/*=======================
+   Input device settings
+ *=======================*/
+
+/* Input device default settings.
+ * Can be changed in the Input device driver (`lv_indev_drv_t`)*/
+
+/* Input device read period in milliseconds */
+#define LV_INDEV_DEF_READ_PERIOD          30
+
+/* Drag threshold in pixels */
+#define LV_INDEV_DEF_DRAG_LIMIT           10
+
+/* Drag throw slow-down in [%]. Greater value -> faster slow-down */
+#define LV_INDEV_DEF_DRAG_THROW           10
+
+/* Long press time in milliseconds.
+ * Time to send `LV_EVENT_LONG_PRESSSED`) */
+#define LV_INDEV_DEF_LONG_PRESS_TIME      400
+
+/* Repeated trigger period in long press [ms]
+ * Time between `LV_EVENT_LONG_PRESSED_REPEAT */
+#define LV_INDEV_DEF_LONG_PRESS_REP_TIME  100
+
+
+/* Gesture threshold in pixels */
+#define LV_INDEV_DEF_GESTURE_LIMIT        50
+
+/* Gesture min velocity at release before swipe (pixels)*/
+#define LV_INDEV_DEF_GESTURE_MIN_VELOCITY 3
+
+/*==================
+ * Feature usage
+ *==================*/
+
+/*1: Enable the Animations */
+#define LV_USE_ANIMATION        1
+#if LV_USE_ANIMATION
+
+/*Declare the type of the user data of animations (can be e.g. `void *`, `int`, `struct`)*/
+typedef void * lv_anim_user_data_t;
+
+#endif
+
+/* 1: Enable shadow drawing*/
+#define LV_USE_SHADOW           1
+#if LV_USE_SHADOW
+/* Allow buffering some shadow calculation
+ * LV_SHADOW_CACHE_SIZE is the max. shadow size to buffer,
+ * where shadow size is `shadow_width + radius`
+ * Caching has LV_SHADOW_CACHE_SIZE^2 RAM cost*/
+#define LV_SHADOW_CACHE_SIZE    0
+#endif
+
+/* 1: Use other blend modes than normal (`LV_BLEND_MODE_...`)*/
+#define LV_USE_BLEND_MODES      1
+
+/* 1: Use the `opa_scale` style property to set the opacity of an object and its children at once*/
+#define LV_USE_OPA_SCALE        1
+
+/* 1: Use image zoom and rotation*/
+#define LV_USE_IMG_TRANSFORM    1
+
+/* 1: Enable object groups (for keyboard/encoder navigation) */
+#define LV_USE_GROUP            1
+#if LV_USE_GROUP
+typedef void * lv_group_user_data_t;
+#endif  /*LV_USE_GROUP*/
+
+/* 1: Enable GPU interface*/
+#define LV_USE_GPU              1   /*Only enables `gpu_fill_cb` and `gpu_blend_cb` in the disp. drv- */
+#define LV_USE_GPU_STM32_DMA2D  0
+
+/* 1: Enable file system (might be required for images */
+#define LV_USE_FILESYSTEM       1
+#if LV_USE_FILESYSTEM
+/*Declare the type of the user data of file system drivers (can be e.g. `void *`, `int`, `struct`)*/
+typedef void * lv_fs_drv_user_data_t;
+#endif
+
+/*1: Add a `user_data` to drivers and objects*/
+#define LV_USE_USER_DATA        1
+
+/*1: Show CPU usage and FPS count in the right bottom corner*/
+#define LV_USE_PERF_MONITOR     0
+
+/*1: Use the functions and types from the older API if possible */
+#define LV_USE_API_EXTENSION_V6  1
+
+/*========================
+ * Image decoder and cache
+ *========================*/
+
+/* 1: Enable indexed (palette) images */
+#define LV_IMG_CF_INDEXED       1
+
+/* 1: Enable alpha indexed images */
+#define LV_IMG_CF_ALPHA         1
+
+/* Default image cache size. Image caching keeps the images opened.
+ * If only the built-in image formats are used there is no real advantage of caching.
+ * (I.e. no new image decoder is added)
+ * With complex image decoders (e.g. PNG or JPG) caching can save the continuous open/decode of images.
+ * However the opened images might consume additional RAM.
+ * LV_IMG_CACHE_DEF_SIZE must be >= 1 */
+#define LV_IMG_CACHE_DEF_SIZE       1
+
+/*Declare the type of the user data of image decoder (can be e.g. `void *`, `int`, `struct`)*/
+typedef void * lv_img_decoder_user_data_t;
+
+/*=====================
+ *  Compiler settings
+ *====================*/
+/* Define a custom attribute to `lv_tick_inc` function */
+#define LV_ATTRIBUTE_TICK_INC
+
+/* Define a custom attribute to `lv_task_handler` function */
+#define LV_ATTRIBUTE_TASK_HANDLER
+
+/* Define a custom attribute to `lv_disp_flush_ready` function */
+#define LV_ATTRIBUTE_FLUSH_READY
+
+/* With size optimization (-Os) the compiler might not align data to
+ * 4 or 8 byte boundary. This alignment will be explicitly applied where needed.
+ * E.g. __attribute__((aligned(4))) */
+#define LV_ATTRIBUTE_MEM_ALIGN
+
+/* Attribute to mark large constant arrays for example
+ * font's bitmaps */
+#define LV_ATTRIBUTE_LARGE_CONST
+
+/* Prefix performance critical functions to place them into a faster memory (e.g RAM)
+ * Uses 15-20 kB extra memory */
+#define LV_ATTRIBUTE_FAST_MEM
+
+/* Export integer constant to binding.
+ * This macro is used with constants in the form of LV_<CONST> that
+ * should also appear on lvgl binding API such as Micropython
+ *
+ * The default value just prevents a GCC warning.
+ */
+#define LV_EXPORT_CONST_INT(int_value) struct _silence_gcc_warning
+
+/*===================
+ *  HAL settings
+ *==================*/
+
+/* 1: use a custom tick source.
+ * It removes the need to manually update the tick with `lv_tick_inc`) */
+#define LV_TICK_CUSTOM     0
+#if LV_TICK_CUSTOM == 1
+#define LV_TICK_CUSTOM_INCLUDE  "something.h"       /*Header for the sys time function*/
+#define LV_TICK_CUSTOM_SYS_TIME_EXPR (millis())     /*Expression evaluating to current systime in ms*/
+#endif   /*LV_TICK_CUSTOM*/
+
+typedef void * lv_disp_drv_user_data_t;             /*Type of user data in the display driver*/
+typedef void * lv_indev_drv_user_data_t;            /*Type of user data in the input device driver*/
+
+/*================
+ * Log settings
+ *===============*/
+
+/*1: Enable the log module*/
+#define LV_USE_LOG      0
+#if LV_USE_LOG
+/* How important log should be added:
+ * LV_LOG_LEVEL_TRACE       A lot of logs to give detailed information
+ * LV_LOG_LEVEL_INFO        Log important events
+ * LV_LOG_LEVEL_WARN        Log if something unwanted happened but didn't cause a problem
+ * LV_LOG_LEVEL_ERROR       Only critical issue, when the system may fail
+ * LV_LOG_LEVEL_NONE        Do not log anything
+ */
+#  define LV_LOG_LEVEL    LV_LOG_LEVEL_WARN
+
+/* 1: Print the log with 'printf';
+ * 0: user need to register a callback with `lv_log_register_print_cb`*/
+#  define LV_LOG_PRINTF   0
+#endif  /*LV_USE_LOG*/
+
+/*=================
+ * Debug settings
+ *================*/
+
+/* If Debug is enabled LittelvGL validates the parameters of the functions.
+ * If an invalid parameter is found an error log message is printed and
+ * the MCU halts at the error. (`LV_USE_LOG` should be enabled)
+ * If you are debugging the MCU you can pause
+ * the debugger to see exactly where  the issue is.
+ *
+ * The behavior of asserts can be overwritten by redefining them here.
+ * E.g. #define LV_ASSERT_MEM(p)  <my_assert_code>
+ */
+#define LV_USE_DEBUG        1
+#if LV_USE_DEBUG
+
+/*Check if the parameter is NULL. (Quite fast) */
+#define LV_USE_ASSERT_NULL      1
+
+/*Checks is the memory is successfully allocated or no. (Quite fast)*/
+#define LV_USE_ASSERT_MEM       1
+
+/*Check the integrity of `lv_mem` after critical operations. (Slow)*/
+#define LV_USE_ASSERT_MEM_INTEGRITY       0
+
+/* Check the strings.
+ * Search for NULL, very long strings, invalid characters, and unnatural repetitions. (Slow)
+ * If disabled `LV_USE_ASSERT_NULL` will be performed instead (if it's enabled) */
+#define LV_USE_ASSERT_STR       0
+
+/* Check NULL, the object's type and existence (e.g. not deleted). (Quite slow)
+ * If disabled `LV_USE_ASSERT_NULL` will be performed instead (if it's enabled) */
+#define LV_USE_ASSERT_OBJ       0
+
+/*Check if the styles are properly initialized. (Fast)*/
+#define LV_USE_ASSERT_STYLE     0
+
+#endif /*LV_USE_DEBUG*/
+
+/*==================
+ *    FONT USAGE
+ *===================*/
+
+/* The built-in fonts contains the ASCII range and some Symbols with  4 bit-per-pixel.
+ * The symbols are available via `LV_SYMBOL_...` defines
+ * More info about fonts: https://docs.lvgl.com/#Fonts
+ * To create a new font go to: https://lvgl.com/ttf-font-to-c-array
+ */
+
+/* Montserrat fonts with bpp = 4
+ * https://fonts.google.com/specimen/Montserrat  */
+#define LV_FONT_MONTSERRAT_12    0
+#define LV_FONT_MONTSERRAT_14    0
+#define LV_FONT_MONTSERRAT_16    1
+#define LV_FONT_MONTSERRAT_18    0
+#define LV_FONT_MONTSERRAT_20    0
+#define LV_FONT_MONTSERRAT_22    0
+#define LV_FONT_MONTSERRAT_24    0
+#define LV_FONT_MONTSERRAT_26    0
+#define LV_FONT_MONTSERRAT_28    0
+#define LV_FONT_MONTSERRAT_30    0
+#define LV_FONT_MONTSERRAT_32    0
+#define LV_FONT_MONTSERRAT_34    0
+#define LV_FONT_MONTSERRAT_36    0
+#define LV_FONT_MONTSERRAT_38    0
+#define LV_FONT_MONTSERRAT_40    0
+#define LV_FONT_MONTSERRAT_42    0
+#define LV_FONT_MONTSERRAT_44    0
+#define LV_FONT_MONTSERRAT_46    0
+#define LV_FONT_MONTSERRAT_48    0
+
+/* Demonstrate special features */
+#define LV_FONT_MONTSERRAT_12_SUBPX      0
+#define LV_FONT_MONTSERRAT_28_COMPRESSED 0  /*bpp = 3*/
+#define LV_FONT_DEJAVU_16_PERSIAN_HEBREW 0  /*Hebrew, Arabic, PErisan letters and all their forms*/
+#define LV_FONT_SIMSUN_16_CJK            0  /*1000 most common CJK radicals*/
+
+/*Pixel perfect monospace font
+ * http://pelulamu.net/unscii/ */
+#define LV_FONT_UNSCII_8     0
+
+/* Optionally declare your custom fonts here.
+ * You can use these fonts as default font too
+ * and they will be available globally. E.g.
+ * #define LV_FONT_CUSTOM_DECLARE LV_FONT_DECLARE(my_font_1) \
+ *                                LV_FONT_DECLARE(my_font_2)
+ */
+#define LV_FONT_CUSTOM_DECLARE
+
+/* Enable it if you have fonts with a lot of characters.
+ * The limit depends on the font size, font face and bpp
+ * but with > 10,000 characters if you see issues probably you need to enable it.*/
+#define LV_FONT_FMT_TXT_LARGE   0
+
+/* Set the pixel order of the display.
+ * Important only if "subpx fonts" are used.
+ * With "normal" font it doesn't matter.
+ */
+#define LV_FONT_SUBPX_BGR    0
+
+/*Declare the type of the user data of fonts (can be e.g. `void *`, `int`, `struct`)*/
+typedef void * lv_font_user_data_t;
+
+/*================
+ *  THEME USAGE
+ *================*/
+
+/*Always enable at least on theme*/
+
+/* No theme, you can apply your styles as you need
+ * No flags. Set LV_THEME_DEFAULT_FLAG 0 */
+ #define LV_USE_THEME_EMPTY       1
+
+/*Simple to the create your theme based on it
+ * No flags. Set LV_THEME_DEFAULT_FLAG 0 */
+ #define LV_USE_THEME_TEMPLATE    1
+
+/* A fast and impressive theme.
+ * Flags:
+ * LV_THEME_MATERIAL_FLAG_LIGHT: light theme
+ * LV_THEME_MATERIAL_FLAG_DARK: dark theme*/
+ #define LV_USE_THEME_MATERIAL    1
+
+/* Mono-color theme for monochrome displays.
+ * If LV_THEME_DEFAULT_COLOR_PRIMARY is LV_COLOR_BLACK the
+ * texts and borders will be black and the background will be
+ * white. Else the colors are inverted.
+ * No flags. Set LV_THEME_DEFAULT_FLAG 0 */
+ #define LV_USE_THEME_MONO        1
+
+#define LV_THEME_DEFAULT_INCLUDE            <stdint.h>      /*Include a header for the init. function*/
+#define LV_THEME_DEFAULT_INIT               lv_theme_material_init
+#define LV_THEME_DEFAULT_COLOR_PRIMARY      LV_COLOR_RED
+#define LV_THEME_DEFAULT_COLOR_SECONDARY    LV_COLOR_BLUE
+#define LV_THEME_DEFAULT_FLAG               LV_THEME_MATERIAL_FLAG_LIGHT
+#define LV_THEME_DEFAULT_FONT_SMALL         &lv_font_montserrat_16
+#define LV_THEME_DEFAULT_FONT_NORMAL        &lv_font_montserrat_16
+#define LV_THEME_DEFAULT_FONT_SUBTITLE      &lv_font_montserrat_16
+#define LV_THEME_DEFAULT_FONT_TITLE         &lv_font_montserrat_16
+
+/*=================
+ *  Text settings
+ *=================*/
+
+/* Select a character encoding for strings.
+ * Your IDE or editor should have the same character encoding
+ * - LV_TXT_ENC_UTF8
+ * - LV_TXT_ENC_ASCII
+ * */
+#define LV_TXT_ENC LV_TXT_ENC_UTF8
+
+ /*Can break (wrap) texts on these chars*/
+#define LV_TXT_BREAK_CHARS                  " ,.;:-_"
+
+/* If a word is at least this long, will break wherever "prettiest"
+ * To disable, set to a value <= 0 */
+#define LV_TXT_LINE_BREAK_LONG_LEN          0
+
+/* Minimum number of characters in a long word to put on a line before a break.
+ * Depends on LV_TXT_LINE_BREAK_LONG_LEN. */
+#define LV_TXT_LINE_BREAK_LONG_PRE_MIN_LEN  3
+
+/* Minimum number of characters in a long word to put on a line after a break.
+ * Depends on LV_TXT_LINE_BREAK_LONG_LEN. */
+#define LV_TXT_LINE_BREAK_LONG_POST_MIN_LEN 3
+
+/* The control character to use for signalling text recoloring. */
+#define LV_TXT_COLOR_CMD "#"
+
+/* Support bidirectional texts.
+ * Allows mixing Left-to-Right and Right-to-Left texts.
+ * The direction will be processed according to the Unicode Bidirectioanl Algorithm:
+ * https://www.w3.org/International/articles/inline-bidi-markup/uba-basics*/
+#define LV_USE_BIDI     0
+#if LV_USE_BIDI
+/* Set the default direction. Supported values:
+ * `LV_BIDI_DIR_LTR` Left-to-Right
+ * `LV_BIDI_DIR_RTL` Right-to-Left
+ * `LV_BIDI_DIR_AUTO` detect texts base direction */
+#define LV_BIDI_BASE_DIR_DEF  LV_BIDI_DIR_AUTO
+#endif
+
+/* Enable Arabic/Persian processing
+ * In these languages characters should be replaced with
+ * an other form based on their position in the text */
+#define LV_USE_ARABIC_PERSIAN_CHARS 0
+
+/*Change the built in (v)snprintf functions*/
+#define LV_SPRINTF_CUSTOM   0
+#if LV_SPRINTF_CUSTOM
+#  define LV_SPRINTF_INCLUDE <stdio.h>
+#  define lv_snprintf     snprintf
+#  define lv_vsnprintf    vsnprintf
+#else   /*!LV_SPRINTF_CUSTOM*/
+#  define LV_SPRINTF_DISABLE_FLOAT 1
+#endif  /*LV_SPRINTF_CUSTOM*/
+
+/*===================
+ *  LV_OBJ SETTINGS
+ *==================*/
+
+#if LV_USE_USER_DATA
+/*Declare the type of the user data of object (can be e.g. `void *`, `int`, `struct`)*/
+typedef void * lv_obj_user_data_t;
+/*Provide a function to free user data*/
+#define LV_USE_USER_DATA_FREE 0
+#if LV_USE_USER_DATA_FREE
+#  define LV_USER_DATA_FREE_INCLUDE  "something.h"  /*Header for user data free function*/
+/* Function prototype : void user_data_free(lv_obj_t * obj); */
+#  define LV_USER_DATA_FREE  (user_data_free)       /*Invoking for user data free function*/
+#endif
+#endif
+
+/*1: enable `lv_obj_realaign()` based on `lv_obj_align()` parameters*/
+#define LV_USE_OBJ_REALIGN          1
+
+/* Enable to make the object clickable on a larger area.
+ * LV_EXT_CLICK_AREA_OFF or 0: Disable this feature
+ * LV_EXT_CLICK_AREA_TINY: The extra area can be adjusted horizontally and vertically (0..255 px)
+ * LV_EXT_CLICK_AREA_FULL: The extra area can be adjusted in all 4 directions (-32k..+32k px)
+ */
+#define LV_USE_EXT_CLICK_AREA  LV_EXT_CLICK_AREA_TINY
+
+/*==================
+ *  LV OBJ X USAGE
+ *================*/
+/*
+ * Documentation of the object types: https://docs.lvgl.com/#Object-types
+ */
+
+/*Arc (dependencies: -)*/
+#define LV_USE_ARC      1
+
+/*Bar (dependencies: -)*/
+#define LV_USE_BAR      1
+
+/*Button (dependencies: lv_cont*/
+#define LV_USE_BTN      1
+
+/*Button matrix (dependencies: -)*/
+#define LV_USE_BTNMATRIX     1
+
+/*Calendar (dependencies: -)*/
+#define LV_USE_CALENDAR 1
+
+/*Canvas (dependencies: lv_img)*/
+#define LV_USE_CANVAS   1
+
+/*Check box (dependencies: lv_btn, lv_label)*/
+#define LV_USE_CHECKBOX       1
+
+/*Chart (dependencies: -)*/
+#define LV_USE_CHART    1
+#if LV_USE_CHART
+#  define LV_CHART_AXIS_TICK_LABEL_MAX_LEN    256
+#endif
+
+/*Container (dependencies: -*/
+#define LV_USE_CONT     1
+
+/*Color picker (dependencies: -*/
+#define LV_USE_CPICKER   1
+
+/*Drop down list (dependencies: lv_page, lv_label, lv_symbol_def.h)*/
+#define LV_USE_DROPDOWN    1
+#if LV_USE_DROPDOWN != 0
+/*Open and close default animation time [ms] (0: no animation)*/
+#  define LV_DROPDOWN_DEF_ANIM_TIME     200
+#endif
+
+/*Gauge (dependencies:lv_bar, lv_linemeter)*/
+#define LV_USE_GAUGE    1
+
+/*Image (dependencies: lv_label*/
+#define LV_USE_IMG      1
+
+/*Image Button (dependencies: lv_btn*/
+#define LV_USE_IMGBTN   1
+#if LV_USE_IMGBTN
+/*1: The imgbtn requires left, mid and right parts and the width can be set freely*/
+#  define LV_IMGBTN_TILED 0
+#endif
+
+/*Keyboard (dependencies: lv_btnm)*/
+#define LV_USE_KEYBOARD       1
+
+/*Label (dependencies: -*/
+#define LV_USE_LABEL    1
+#if LV_USE_LABEL != 0
+/*Hor, or ver. scroll speed [px/sec] in 'LV_LABEL_LONG_ROLL/ROLL_CIRC' mode*/
+#  define LV_LABEL_DEF_SCROLL_SPEED       25
+
+/* Waiting period at beginning/end of animation cycle */
+#  define LV_LABEL_WAIT_CHAR_COUNT        3
+
+/*Enable selecting text of the label */
+#  define LV_LABEL_TEXT_SEL               0
+
+/*Store extra some info in labels (12 bytes) to speed up drawing of very long texts*/
+#  define LV_LABEL_LONG_TXT_HINT          0
+#endif
+
+/*LED (dependencies: -)*/
+#define LV_USE_LED      1
+#if LV_USE_LED
+#  define LV_LED_BRIGHT_MIN  120      /*Minimal brightness*/
+#  define LV_LED_BRIGHT_MAX  255     /*Maximal brightness*/
+#endif
+
+/*Line (dependencies: -*/
+#define LV_USE_LINE     1
+
+/*List (dependencies: lv_page, lv_btn, lv_label, (lv_img optionally for icons ))*/
+#define LV_USE_LIST     1
+#if LV_USE_LIST != 0
+/*Default animation time of focusing to a list element [ms] (0: no animation)  */
+#  define LV_LIST_DEF_ANIM_TIME  100
+#endif
+
+/*Line meter (dependencies: *;)*/
+#define LV_USE_LINEMETER   1
+#if LV_USE_LINEMETER
+/* Draw line more precisely at cost of performance.
+ * Useful if there are lot of lines any minor are visible
+ * 0: No extra precision
+ * 1: Some extra precision
+ * 2: Best precision
+ */
+#  define LV_LINEMETER_PRECISE    0
+#endif
+
+/*Mask (dependencies: -)*/
+#define LV_USE_OBJMASK  1
+
+/*Message box (dependencies: lv_rect, lv_btnm, lv_label)*/
+#define LV_USE_MSGBOX     1
+
+/*Page (dependencies: lv_cont)*/
+#define LV_USE_PAGE     1
+#if LV_USE_PAGE != 0
+/*Focus default animation time [ms] (0: no animation)*/
+#  define LV_PAGE_DEF_ANIM_TIME     400
+#endif
+
+/*Preload (dependencies: lv_arc, lv_anim)*/
+#define LV_USE_SPINNER      1
+#if LV_USE_SPINNER != 0
+#  define LV_SPINNER_DEF_ARC_LENGTH   60      /*[deg]*/
+#  define LV_SPINNER_DEF_SPIN_TIME    1000    /*[ms]*/
+#  define LV_SPINNER_DEF_ANIM         LV_SPINNER_TYPE_SPINNING_ARC
+#endif
+
+/*Roller (dependencies: lv_ddlist)*/
+#define LV_USE_ROLLER    1
+#if LV_USE_ROLLER != 0
+/*Focus animation time [ms] (0: no animation)*/
+#  define LV_ROLLER_DEF_ANIM_TIME     200
+
+/*Number of extra "pages" when the roller is infinite*/
+#  define LV_ROLLER_INF_PAGES         7
+#endif
+
+/*Slider (dependencies: lv_bar)*/
+#define LV_USE_SLIDER    1
+
+/*Spinbox (dependencies: lv_ta)*/
+#define LV_USE_SPINBOX       1
+
+/*Switch (dependencies: lv_slider)*/
+#define LV_USE_SWITCH       1
+
+/*Text area (dependencies: lv_label, lv_page)*/
+#define LV_USE_TEXTAREA       1
+#if LV_USE_TEXTAREA != 0
+#  define LV_TEXTAREA_DEF_CURSOR_BLINK_TIME 400     /*ms*/
+#  define LV_TEXTAREA_DEF_PWD_SHOW_TIME     1500    /*ms*/
+#endif
+
+/*Table (dependencies: lv_label)*/
+#define LV_USE_TABLE    1
+#if LV_USE_TABLE
+#  define LV_TABLE_COL_MAX    12
+#endif
+
+/*Tab (dependencies: lv_page, lv_btnm)*/
+#define LV_USE_TABVIEW      1
+#  if LV_USE_TABVIEW != 0
+/*Time of slide animation [ms] (0: no animation)*/
+#  define LV_TABVIEW_DEF_ANIM_TIME    300
+#endif
+
+/*Tileview (dependencies: lv_page) */
+#define LV_USE_TILEVIEW     1
+#if LV_USE_TILEVIEW
+/*Time of slide animation [ms] (0: no animation)*/
+#  define LV_TILEVIEW_DEF_ANIM_TIME   300
+#endif
+
+/*Window (dependencies: lv_cont, lv_btn, lv_label, lv_img, lv_page)*/
+#define LV_USE_WIN      1
+
+/*==================
+ * Non-user section
+ *==================*/
+
+#if defined(_MSC_VER) && !defined(_CRT_SECURE_NO_WARNINGS)    /* Disable warnings for Visual Studio*/
+#  define _CRT_SECURE_NO_WARNINGS
+#endif
+
+/*--END OF LV_CONF_H--*/
+
+#endif /*LV_CONF_H*/
+
+#endif /*End of "Content enable"*/

lvgl-sys/vendor/lvgl

@@ -1 +1 @@
-Subproject commit 1ca1934dbe8e826ef1ed1690005fb678fea3a1f3
+Subproject commit 524709472757405ac0eef8d6d002632526430df3

lvgl/Cargo.toml

@@ -1,7 +1,7 @@
 [package]
 name = "lvgl"
-description = "LittlevGL bindings for Rust. A powerful and easy-to-use embedded GUI with many widgets, advanced visual effects (opacity, antialiasing, animations) and low memory requirements (16K RAM, 64K Flash)."
-version = "0.3.0"
+description = "LVGL bindings for Rust. A powerful and easy-to-use embedded GUI with many widgets, advanced visual effects (opacity, antialiasing, animations) and low memory requirements (16K RAM, 64K Flash)."
+version = "0.5.2"
 authors = ["Rafael Caricio <crates.lvgl@caric.io>"]
 edition = "2018"
 repository = "https://github.com/rafaelcaricio/lvgl-rs"
@@ -12,15 +12,47 @@ keywords = ["littlevgl", "lvgl", "graphical_interfaces"]
 build = "build.rs"
 
 [dependencies]
-lvgl-sys = { version = "0.3.0", path = "../lvgl-sys" }
+lvgl-sys = { version = "0.5.2", path = "../lvgl-sys" }
 cty = "0.2.1"
-embedded-graphics = "0.6.2"
-cstr_core = { version = "0.2.0", default-features = false, features = ["alloc"] }
+embedded-graphics = "0.7.1"
+cstr_core = "0.2.3"
 bitflags = "1.2.1"
 
-[build-dependencies]
-quote = "1.0.7"
-proc-macro2 = "1.0.18"
-lvgl-codegen = { version = "0.3.0", path = "../lvgl-codegen" }
-lvgl-sys = { version = "0.3.0", path = "../lvgl-sys" }
+[features]
+alloc = ["cstr_core/alloc"]
+lvgl_alloc = ["alloc"]
+use-vendored-config = ["lvgl-sys/use-vendored-config"]
 
+[build-dependencies]
+quote = "1.0.9"
+proc-macro2 = "1.0.24"
+lvgl-codegen = { version = "0.5.2", path = "../lvgl-codegen" }
+lvgl-sys = { version = "0.5.2", path = "../lvgl-sys" }
+
+[dev-dependencies]
+embedded-graphics-simulator = "0.3.0"
+heapless = "0.7.13"
+
+[[example]]
+name = "demo"
+path = "../examples/demo.rs"
+required-features = ["alloc"]
+
+[[example]]
+name = "bar"
+path = "../examples/bar.rs"
+required-features = ["alloc"]
+
+[[example]]
+name = "button_click"
+path = "../examples/button_click.rs"
+required-features = ["alloc"]
+
+[[example]]
+name = "gauge"
+path = "../examples/gauge.rs"
+
+[[example]]
+name = "arc"
+path = "../examples/arc.rs"
+required-features = ["lvgl_alloc"]

lvgl/src/allocator.rs

@@ -0,0 +1,20 @@
+use core::alloc::{GlobalAlloc, Layout};
+
+// Register the global allocator
+#[global_allocator]
+static ALLOCATOR: LvglAlloc = LvglAlloc;
+
+pub struct LvglAlloc;
+
+unsafe impl GlobalAlloc for LvglAlloc {
+    unsafe fn alloc(&self, layout: Layout) -> *mut u8 {
+        // Make sure LVGL is initialized!
+        crate::lvgl_init();
+        lvgl_sys::lv_mem_alloc(layout.size() as lvgl_sys::size_t) as *mut u8
+    }
+
+    unsafe fn dealloc(&self, ptr: *mut u8, _layout: Layout) {
+        crate::lvgl_init();
+        lvgl_sys::lv_mem_free(ptr as *const cty::c_void)
+    }
+}

lvgl/src/display.rs

@@ -1,138 +0,0 @@
-use crate::Color;
-use alloc::boxed::Box;
-use core::mem::MaybeUninit;
-use embedded_graphics::prelude::*;
-use embedded_graphics::{drawable, DrawTarget};
-
-pub struct DisplayDriver {
-    pub(crate) raw: lvgl_sys::lv_disp_drv_t,
-}
-
-impl DisplayDriver {
-    // we should accept a Rc<RefCell<T>> and throw it in a box and add to the user_data of the callback handler function
-    pub fn new<T, C>(device: &mut T) -> Self
-    where
-        T: DrawTarget<C>,
-        C: PixelColor + From<Color>,
-    {
-        let disp_drv = unsafe {
-            // Declare a buffer for the refresh rate
-            // TODO: Make this an external configuration
-            const REFRESH_BUFFER_LEN: usize = 2;
-            let refresh_buffer1 = vec![
-                Color::from_rgb((0, 0, 0)).raw;
-                lvgl_sys::LV_HOR_RES_MAX as usize * REFRESH_BUFFER_LEN
-            ];
-
-            let refresh_buffer2 = vec![
-                Color::from_rgb((0, 0, 0)).raw;
-                lvgl_sys::LV_HOR_RES_MAX as usize * REFRESH_BUFFER_LEN
-            ];
-
-            // Create a display buffer for LittlevGL
-            let mut display_buffer = MaybeUninit::<lvgl_sys::lv_disp_buf_t>::uninit();
-            // Initialize the display buffer
-            lvgl_sys::lv_disp_buf_init(
-                display_buffer.as_mut_ptr(),
-                Box::into_raw(refresh_buffer1.into_boxed_slice()) as *mut cty::c_void,
-                Box::into_raw(refresh_buffer2.into_boxed_slice()) as *mut cty::c_void,
-                lvgl_sys::LV_HOR_RES_MAX * REFRESH_BUFFER_LEN as u32,
-            );
-            let display_buffer = Box::new(display_buffer.assume_init());
-
-            // Basic initialization of the display driver
-            let mut disp_drv = MaybeUninit::<lvgl_sys::lv_disp_drv_t>::uninit();
-            lvgl_sys::lv_disp_drv_init(disp_drv.as_mut_ptr());
-            let mut disp_drv = disp_drv.assume_init();
-            // Assign the buffer to the display
-            disp_drv.buffer = Box::into_raw(display_buffer);
-            // Set your driver function
-            disp_drv.flush_cb = Some(display_callback_wrapper::<T, C>);
-            // TODO: DrawHandler type here
-            // Safety: `user_data` is set to NULL in C code.
-            disp_drv.user_data = device as *mut _ as *mut cty::c_void;
-            disp_drv
-        };
-        Self { raw: disp_drv }
-    }
-}
-
-// We need to keep a reference to the DisplayDriver in UI if we implement Drop
-// impl Drop for DisplayDriver {
-//     fn drop(&mut self) {
-//         // grab the user data and deref the DrawHandler to free the instance for dealloc in the Rust universe.
-//         unimplemented!()
-//     }
-// }
-
-// a reference is kept to the external drawing target (T)
-// the reference is kept in the callback function of the drawing handler
-// we need a reference counter for the drawing target and free the ref counter when the display is
-// destroyed.
-//type DrawHandler = Rc<RefCell<u8>>;
-//
-// impl Drop for DrawHandler {
-//     fn drop(&mut self) {
-//         unimplemented!()
-//     }
-// }
-
-unsafe extern "C" fn display_callback_wrapper<T, C>(
-    disp_drv: *mut lvgl_sys::lv_disp_drv_t,
-    area: *const lvgl_sys::lv_area_t,
-    color_p: *mut lvgl_sys::lv_color_t,
-) where
-    T: DrawTarget<C>,
-    C: PixelColor + From<Color>,
-{
-    // In the `std` world we would make sure to capture panics here and make them not escape across
-    // the FFI boundary. Since this library is focused on embedded platforms, we don't
-    // have an standard unwinding mechanism to rely upon.
-    let display_driver = *disp_drv;
-    // Rust code closure reference
-    if !display_driver.user_data.is_null() {
-        let device = &mut *(display_driver.user_data as *mut T);
-        let x1 = (*area).x1;
-        let x2 = (*area).x2;
-        let y1 = (*area).y1;
-        let y2 = (*area).y2;
-        // TODO: Can we do anything when there is a error while flushing?
-        let _ = display_flush(device, (x1, x2), (y1, y2), color_p);
-    }
-    // Indicate to LittlevGL that we are ready with the flushing
-    lvgl_sys::lv_disp_flush_ready(disp_drv);
-}
-
-// We separate this display flush function to reduce the amount of unsafe code we need to write.
-// This also provides a good separation of concerns, what is necessary from LittlevGL to work and
-// what is the lvgl-rs wrapper responsibility.
-fn display_flush<T, C>(
-    display: &mut T,
-    (x1, x2): (i16, i16),
-    (y1, y2): (i16, i16),
-    color_p: *mut lvgl_sys::lv_color_t,
-) -> Result<(), T::Error>
-where
-    T: DrawTarget<C>,
-    C: PixelColor + From<Color>,
-{
-    let ys = y1..=y2;
-    let xs = (x1..=x2).enumerate();
-    let x_len = (x2 - x1 + 1) as usize;
-
-    // We use iterators here to ensure that the Rust compiler can apply all possible
-    // optimizations at compile time.
-    let pixels = ys
-        .enumerate()
-        .map(|(iy, y)| {
-            xs.clone().map(move |(ix, x)| {
-                let color_len = x_len * iy + ix;
-                let lv_color = unsafe { *color_p.add(color_len) };
-                let raw_color = Color::from_raw(lv_color);
-                drawable::Pixel(Point::new(x as i32, y as i32), raw_color.into())
-            })
-        })
-        .flatten();
-
-    Ok(display.draw_iter(pixels)?)
-}

lvgl/src/global.rs

@@ -1,72 +0,0 @@
-use crate::{DisplayDriver, Event, LvError, LvResult, Obj, Widget};
-use alloc::boxed::Box;
-use core::marker::PhantomData;
-use core::ptr;
-use core::ptr::NonNull;
-use core::sync::atomic::{AtomicBool, Ordering};
-use core::time::Duration;
-
-// There can only be a single reference to LittlevGL library.
-static LVGL_IN_USE: AtomicBool = AtomicBool::new(false);
-
-pub struct UI {
-    // LittlevGL is not thread-safe by default.
-    _not_sync: PhantomData<*mut ()>,
-}
-
-// LittlevGL does not use thread locals.
-unsafe impl Send for UI {}
-
-impl UI {
-    pub fn init() -> LvResult<Self> {
-        if !LVGL_IN_USE.compare_and_swap(false, true, Ordering::SeqCst) {
-            unsafe {
-                lvgl_sys::lv_init();
-            }
-            Ok(Self {
-                _not_sync: PhantomData,
-            })
-        } else {
-            Err(LvError::AlreadyInUse)
-        }
-    }
-
-    pub fn disp_drv_register(&mut self, display: DisplayDriver) {
-        // Throw display driver into a box and add to user data (if we need to get the display back)
-        // or simply forget the display pointer/object to prevent Drop to be called
-        // register it
-        unsafe {
-            let boxed = Box::new(display.raw);
-            lvgl_sys::lv_disp_drv_register(Box::into_raw(boxed));
-        }
-    }
-
-    pub fn scr_act(&self) -> LvResult<Obj> {
-        unsafe {
-            let screen = lvgl_sys::lv_disp_get_scr_act(ptr::null_mut());
-            Ok(Obj::from_raw(NonNull::new(screen)?))
-        }
-    }
-
-    pub fn event_send<T>(&mut self, obj: &mut T, event: Event<T::SpecialEvent>) -> LvResult<()>
-    where
-        T: Widget,
-    {
-        unsafe {
-            lvgl_sys::lv_event_send(obj.raw()?.as_mut(), event.into(), ptr::null_mut());
-        }
-        Ok(())
-    }
-
-    pub fn tick_inc(&mut self, tick_period: Duration) {
-        unsafe {
-            lvgl_sys::lv_tick_inc(tick_period.as_millis() as u32);
-        }
-    }
-
-    pub fn task_handler(&mut self) {
-        unsafe {
-            lvgl_sys::lv_task_handler();
-        }
-    }
-}

lvgl/src/lib.rs

@@ -1,19 +1,68 @@
-#![feature(try_trait)]
-#![no_std]
+//! [![github]](https://github.com/rafaelcaricio/lvgl-rs) [![crates-io]](https://crates.io/crates/lvgl) [![docs-rs]](crate)
+//!
+//! [github]: https://img.shields.io/badge/github-8da0cb?style=for-the-badge&labelColor=555555&logo=github
+//! [crates-io]: https://img.shields.io/badge/crates.io-fc8d62?style=for-the-badge&labelColor=555555&logo=rust
+//! [docs-rs]: https://img.shields.io/badge/docs.rs-66c2a5?style=for-the-badge&labelColor=555555&logoColor=white&logo=data:image/svg+xml;base64,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
+//!
+//! <br>
+//!
+//! [LVGL][1] bindings for Rust. A powerful and easy-to-use embedded GUI with many widgets, advanced visual effects, and
+//! low memory footprint. This crate is compatible with `#![no_std]` environments by default.
+//!
+//! [1]: https://docs.lvgl.io/v7/en/html/get-started/quick-overview.html
+//!
+
+#![cfg_attr(not(test), no_std)]
 
-#[macro_use]
-extern crate alloc;
 #[macro_use]
 extern crate bitflags;
 
-mod display;
-mod global;
+#[cfg(feature = "lvgl_alloc")]
+extern crate alloc;
+
+// We can ONLY use `alloc::boxed::Box` if `lvgl_alloc` is enabled.
+// That is because we use `Box` to send memory references to LVGL. Since the global allocator, when
+// `lvgl_alloc` feature is enabled, is the LVGL memory manager then everything is in LVGL
+// managed memory anyways. In that case we can use the Rust's provided Box definition.
+//
+#[cfg(feature = "lvgl_alloc")]
+use ::alloc::boxed::Box;
+
+#[cfg(feature = "lvgl_alloc")]
+mod allocator;
+
 mod support;
+mod ui;
 #[macro_use]
 mod lv_core;
 pub mod widgets;
 
-pub use display::DisplayDriver;
-pub use global::UI;
+#[cfg(not(feature = "lvgl_alloc"))]
+pub(crate) mod mem;
+
+// When LVGL allocator is not used on the Rust code, we need a way to add objects to the LVGL
+// managed memory. We implement a very simple `Box` that has the minimal features to copy memory
+// safely to the LVGL managed memory.
+//
+#[cfg(not(feature = "lvgl_alloc"))]
+use crate::mem::Box;
+
 pub use lv_core::*;
 pub use support::*;
+pub use ui::*;
+
+use core::sync::atomic::{AtomicBool, Ordering};
+
+// Initialize LVGL only once.
+static LVGL_INITIALIZED: AtomicBool = AtomicBool::new(false);
+
+pub(crate) fn lvgl_init() {
+    if LVGL_INITIALIZED
+        .compare_exchange(false, true, Ordering::Relaxed, Ordering::Relaxed)
+        .is_ok()
+    {
+        unsafe {
+            lvgl_sys::lv_init();
+        }
+    }
+}

lvgl/src/lv_core/obj.rs

@@ -1,9 +1,9 @@
 use crate::lv_core::style::Style;
+use crate::Box;
 use crate::{Align, LvError, LvResult};
-use alloc::boxed::Box;
 use core::ptr;
 
-/// Represents a native LittlevGL object
+/// Represents a native LVGL object
 pub trait NativeObject {
     /// Provide common way to access to the underlying native object pointer.
     fn raw(&self) -> LvResult<ptr::NonNull<lvgl_sys::lv_obj_t>>;
@@ -28,7 +28,7 @@ impl NativeObject for Obj {
     }
 }
 
-/// A wrapper for all LittlevGL common operations on generic objects.
+/// A wrapper for all LVGL common operations on generic objects.
 pub trait Widget: NativeObject {
     type SpecialEvent;
     type Part: Into<u8>;
@@ -40,7 +40,7 @@ pub trait Widget: NativeObject {
     ///
     unsafe fn from_raw(raw_pointer: ptr::NonNull<lvgl_sys::lv_obj_t>) -> Self;
 
-    fn add_style(&mut self, part: Self::Part, style: Style) -> LvResult<()> {
+    fn add_style(&self, part: Self::Part, style: Style) -> LvResult<()> {
         unsafe {
             lvgl_sys::lv_obj_add_style(self.raw()?.as_mut(), part.into(), Box::into_raw(style.raw));
         };
@@ -146,8 +146,8 @@ macro_rules! define_object {
                 unsafe {
                     let mut raw = self.raw()?;
                     let obj = raw.as_mut();
-                    let user_closure = alloc::boxed::Box::new(f);
-                    obj.user_data = alloc::boxed::Box::into_raw(user_closure) as *mut cty::c_void;
+                    let user_closure = $crate::Box::new(f);
+                    obj.user_data = $crate::Box::into_raw(user_closure) as *mut cty::c_void;
                     lvgl_sys::lv_obj_set_event_cb(
                         obj,
                         lvgl_sys::lv_event_cb_t::Some($crate::support::event_callback::<Self, F>),
@@ -179,19 +179,19 @@ macro_rules! define_object {
 bitflags! {
     pub struct State: u32 {
         /// Normal, released
-        const DEFAULT  = lvgl_sys::LV_STATE_DEFAULT;
+        const DEFAULT  = lvgl_sys::LV_STATE_DEFAULT as u32;
         /// Toggled or checked
-        const CHECKED  = lvgl_sys::LV_STATE_CHECKED;
+        const CHECKED  = lvgl_sys::LV_STATE_CHECKED as u32;
         /// Focused via keypad or encoder or clicked via touchpad/mouse
-        const FOCUSED  = lvgl_sys::LV_STATE_FOCUSED;
+        const FOCUSED  = lvgl_sys::LV_STATE_FOCUSED as u32;
         /// Edit by an encoder
-        const EDITED   = lvgl_sys::LV_STATE_EDITED;
+        const EDITED   = lvgl_sys::LV_STATE_EDITED as u32;
         /// Hovered by mouse (not supported now)
-        const HOVERED  = lvgl_sys::LV_STATE_HOVERED;
+        const HOVERED  = lvgl_sys::LV_STATE_HOVERED as u32;
         /// Pressed
-        const PRESSED  = lvgl_sys::LV_STATE_PRESSED;
+        const PRESSED  = lvgl_sys::LV_STATE_PRESSED as u32;
         /// Disabled or inactive
-        const DISABLED = lvgl_sys::LV_STATE_DISABLED;
+        const DISABLED = lvgl_sys::LV_STATE_DISABLED as u32;
     }
 }
 
@@ -206,9 +206,9 @@ pub enum Part {
     All,
 }
 
-impl Into<u8> for Part {
-    fn into(self) -> u8 {
-        match self {
+impl From<Part> for u8 {
+    fn from(self_: Part) -> u8 {
+        match self_ {
             Part::Main => lvgl_sys::LV_OBJ_PART_MAIN as u8,
             Part::All => lvgl_sys::LV_OBJ_PART_ALL as u8,
         }

lvgl/src/lv_core/style.rs

@@ -1,26 +1,26 @@
+use crate::Box;
 use crate::{Color, LvResult, State};
-use alloc::boxed::Box;
 use core::mem;
-use cstr_core::CString;
+use cstr_core::CStr;
 
 pub enum Themes {
     Pretty,
 }
 
+#[derive(Clone)]
 pub struct Style {
     pub(crate) raw: Box<lvgl_sys::lv_style_t>,
 }
 
 impl Style {
-    pub fn set_value_str(&mut self, state: State, value: &str) -> LvResult<()> {
+    pub fn set_value_str(&mut self, state: State, value: &CStr) -> LvResult<()> {
         let native_state: u32 = state.get_bits();
-        let string = CString::new(value)?;
         unsafe {
             lvgl_sys::_lv_style_set_ptr(
                 self.raw.as_mut(),
-                (lvgl_sys::LV_STYLE_VALUE_STR
+                (lvgl_sys::LV_STYLE_VALUE_STR as u32
                     | (native_state << lvgl_sys::LV_STYLE_STATE_POS as u32)) as u16,
-                string.into_raw() as *mut cty::c_void,
+                value.as_ptr() as *mut cty::c_void,
             );
         }
         Ok(())
@@ -40,122 +40,122 @@ impl Default for Style {
 
 bitflags! {
     pub struct Opacity: u32 {
-        const OPA_TRANSP = lvgl_sys::LV_OPA_TRANSP;
-        const OPA_0 = lvgl_sys::LV_OPA_0;
-        const OPA_10 = lvgl_sys::LV_OPA_10;
-        const OPA_20 = lvgl_sys::LV_OPA_20;
-        const OPA_30 = lvgl_sys::LV_OPA_30;
-        const OPA_40 = lvgl_sys::LV_OPA_40;
-        const OPA_50 = lvgl_sys::LV_OPA_50;
-        const OPA_60 = lvgl_sys::LV_OPA_60;
-        const OPA_70 = lvgl_sys::LV_OPA_70;
-        const OPA_80 = lvgl_sys::LV_OPA_80;
-        const OPA_90 = lvgl_sys::LV_OPA_90;
-        const OPA_100 = lvgl_sys::LV_OPA_100;
-        const OPA_COVER = lvgl_sys::LV_OPA_COVER;
+        const OPA_TRANSP = lvgl_sys::LV_OPA_TRANSP as u32;
+        const OPA_0 = lvgl_sys::LV_OPA_0 as u32;
+        const OPA_10 = lvgl_sys::LV_OPA_10 as u32;
+        const OPA_20 = lvgl_sys::LV_OPA_20 as u32;
+        const OPA_30 = lvgl_sys::LV_OPA_30 as u32;
+        const OPA_40 = lvgl_sys::LV_OPA_40 as u32;
+        const OPA_50 = lvgl_sys::LV_OPA_50 as u32;
+        const OPA_60 = lvgl_sys::LV_OPA_60 as u32;
+        const OPA_70 = lvgl_sys::LV_OPA_70 as u32;
+        const OPA_80 = lvgl_sys::LV_OPA_80 as u32;
+        const OPA_90 = lvgl_sys::LV_OPA_90 as u32;
+        const OPA_100 = lvgl_sys::LV_OPA_100 as u32;
+        const OPA_COVER = lvgl_sys::LV_OPA_COVER as u32;
     }
 }
 
-impl Into<u8> for Opacity {
-    fn into(self) -> u8 {
-        self.bits as u8
+impl From<Opacity> for u8 {
+    fn from(self_: Opacity) -> u8 {
+        self_.bits as u8
     }
 }
 
 bitflags! {
     pub struct StyleProp: u32 {
-        const RADIUS = lvgl_sys::LV_STYLE_RADIUS;
-        const CLIP_CORNER = lvgl_sys::LV_STYLE_CLIP_CORNER;
-        const SIZE = lvgl_sys::LV_STYLE_SIZE;
-        const TRANSFORM_WIDTH = lvgl_sys::LV_STYLE_TRANSFORM_WIDTH;
-        const TRANSFORM_HEIGHT = lvgl_sys::LV_STYLE_TRANSFORM_HEIGHT;
-        const TRANSFORM_ANGLE = lvgl_sys::LV_STYLE_TRANSFORM_ANGLE;
-        const TRANSFORM_ZOOM = lvgl_sys::LV_STYLE_TRANSFORM_ZOOM;
-        const OPA_SCALE = lvgl_sys::LV_STYLE_OPA_SCALE;
-        const PAD_TOP = lvgl_sys::LV_STYLE_PAD_TOP;
-        const PAD_BOTTOM = lvgl_sys::LV_STYLE_PAD_BOTTOM;
-        const PAD_LEFT = lvgl_sys::LV_STYLE_PAD_LEFT;
-        const PAD_RIGHT = lvgl_sys::LV_STYLE_PAD_RIGHT;
-        const PAD_INNER = lvgl_sys::LV_STYLE_PAD_INNER;
-        const MARGIN_TOP = lvgl_sys::LV_STYLE_MARGIN_TOP;
-        const MARGIN_BOTTOM = lvgl_sys::LV_STYLE_MARGIN_BOTTOM;
-        const MARGIN_LEFT = lvgl_sys::LV_STYLE_MARGIN_LEFT;
-        const MARGIN_RIGHT = lvgl_sys::LV_STYLE_MARGIN_RIGHT;
-        const BG_BLEND_MODE = lvgl_sys::LV_STYLE_BG_BLEND_MODE;
-        const BG_MAIN_STOP = lvgl_sys::LV_STYLE_BG_MAIN_STOP;
-        const BG_GRAD_STOP = lvgl_sys::LV_STYLE_BG_GRAD_STOP;
-        const BG_GRAD_DIR = lvgl_sys::LV_STYLE_BG_GRAD_DIR;
-        const BG_COLOR = lvgl_sys::LV_STYLE_BG_COLOR;
-        const BG_GRAD_COLOR = lvgl_sys::LV_STYLE_BG_GRAD_COLOR;
-        const BG_OPA = lvgl_sys::LV_STYLE_BG_OPA;
-        const BORDER_WIDTH = lvgl_sys::LV_STYLE_BORDER_WIDTH;
-        const BORDER_SIDE = lvgl_sys::LV_STYLE_BORDER_SIDE;
-        const BORDER_BLEND_MODE = lvgl_sys::LV_STYLE_BORDER_BLEND_MODE;
-        const BORDER_POST = lvgl_sys::LV_STYLE_BORDER_POST;
-        const BORDER_COLOR = lvgl_sys::LV_STYLE_BORDER_COLOR;
-        const BORDER_OPA = lvgl_sys::LV_STYLE_BORDER_OPA;
-        const OUTLINE_WIDTH = lvgl_sys::LV_STYLE_OUTLINE_WIDTH;
-        const OUTLINE_PAD = lvgl_sys::LV_STYLE_OUTLINE_PAD;
-        const OUTLINE_BLEND_MODE = lvgl_sys::LV_STYLE_OUTLINE_BLEND_MODE;
-        const OUTLINE_COLOR = lvgl_sys::LV_STYLE_OUTLINE_COLOR;
-        const OUTLINE_OPA = lvgl_sys::LV_STYLE_OUTLINE_OPA;
-        const SHADOW_WIDTH = lvgl_sys::LV_STYLE_SHADOW_WIDTH;
-        const SHADOW_OFS_X = lvgl_sys::LV_STYLE_SHADOW_OFS_X;
-        const SHADOW_OFS_Y = lvgl_sys::LV_STYLE_SHADOW_OFS_Y;
-        const SHADOW_SPREAD = lvgl_sys::LV_STYLE_SHADOW_SPREAD;
-        const SHADOW_BLEND_MODE = lvgl_sys::LV_STYLE_SHADOW_BLEND_MODE;
-        const SHADOW_COLOR = lvgl_sys::LV_STYLE_SHADOW_COLOR;
-        const SHADOW_OPA = lvgl_sys::LV_STYLE_SHADOW_OPA;
-        const PATTERN_BLEND_MODE = lvgl_sys::LV_STYLE_PATTERN_BLEND_MODE;
-        const PATTERN_REPEAT = lvgl_sys::LV_STYLE_PATTERN_REPEAT;
-        const PATTERN_RECOLOR = lvgl_sys::LV_STYLE_PATTERN_RECOLOR;
-        const PATTERN_OPA = lvgl_sys::LV_STYLE_PATTERN_OPA;
-        const PATTERN_RECOLOR_OPA = lvgl_sys::LV_STYLE_PATTERN_RECOLOR_OPA;
-        const PATTERN_IMAGE = lvgl_sys::LV_STYLE_PATTERN_IMAGE;
-        const VALUE_LETTER_SPACE = lvgl_sys::LV_STYLE_VALUE_LETTER_SPACE;
-        const VALUE_LINE_SPACE = lvgl_sys::LV_STYLE_VALUE_LINE_SPACE;
-        const VALUE_BLEND_MODE = lvgl_sys::LV_STYLE_VALUE_BLEND_MODE;
-        const VALUE_OFS_X = lvgl_sys::LV_STYLE_VALUE_OFS_X;
-        const VALUE_OFS_Y = lvgl_sys::LV_STYLE_VALUE_OFS_Y;
-        const VALUE_ALIGN = lvgl_sys::LV_STYLE_VALUE_ALIGN;
-        const VALUE_COLOR = lvgl_sys::LV_STYLE_VALUE_COLOR;
-        const VALUE_OPA = lvgl_sys::LV_STYLE_VALUE_OPA;
-        const VALUE_FONT = lvgl_sys::LV_STYLE_VALUE_FONT;
-        const VALUE_STR = lvgl_sys::LV_STYLE_VALUE_STR;
-        const TEXT_LETTER_SPACE = lvgl_sys::LV_STYLE_TEXT_LETTER_SPACE;
-        const TEXT_LINE_SPACE = lvgl_sys::LV_STYLE_TEXT_LINE_SPACE;
-        const TEXT_DECOR = lvgl_sys::LV_STYLE_TEXT_DECOR;
-        const TEXT_BLEND_MODE = lvgl_sys::LV_STYLE_TEXT_BLEND_MODE;
-        const TEXT_COLOR = lvgl_sys::LV_STYLE_TEXT_COLOR;
-        const TEXT_SEL_COLOR = lvgl_sys::LV_STYLE_TEXT_SEL_COLOR;
-        const TEXT_OPA = lvgl_sys::LV_STYLE_TEXT_OPA;
-        const TEXT_FONT = lvgl_sys::LV_STYLE_TEXT_FONT;
-        const LINE_WIDTH = lvgl_sys::LV_STYLE_LINE_WIDTH;
-        const LINE_BLEND_MODE = lvgl_sys::LV_STYLE_LINE_BLEND_MODE;
-        const LINE_DASH_WIDTH = lvgl_sys::LV_STYLE_LINE_DASH_WIDTH;
-        const LINE_DASH_GAP = lvgl_sys::LV_STYLE_LINE_DASH_GAP;
-        const LINE_ROUNDED = lvgl_sys::LV_STYLE_LINE_ROUNDED;
-        const LINE_COLOR = lvgl_sys::LV_STYLE_LINE_COLOR;
-        const LINE_OPA = lvgl_sys::LV_STYLE_LINE_OPA;
-        const IMAGE_BLEND_MODE = lvgl_sys::LV_STYLE_IMAGE_BLEND_MODE;
-        const IMAGE_RECOLOR = lvgl_sys::LV_STYLE_IMAGE_RECOLOR;
-        const IMAGE_OPA = lvgl_sys::LV_STYLE_IMAGE_OPA;
-        const IMAGE_RECOLOR_OPA = lvgl_sys::LV_STYLE_IMAGE_RECOLOR_OPA;
-        const TRANSITION_TIME = lvgl_sys::LV_STYLE_TRANSITION_TIME;
-        const TRANSITION_DELAY = lvgl_sys::LV_STYLE_TRANSITION_DELAY;
-        const TRANSITION_PROP_1 = lvgl_sys::LV_STYLE_TRANSITION_PROP_1;
-        const TRANSITION_PROP_2 = lvgl_sys::LV_STYLE_TRANSITION_PROP_2;
-        const TRANSITION_PROP_3 = lvgl_sys::LV_STYLE_TRANSITION_PROP_3;
-        const TRANSITION_PROP_4 = lvgl_sys::LV_STYLE_TRANSITION_PROP_4;
-        const TRANSITION_PROP_5 = lvgl_sys::LV_STYLE_TRANSITION_PROP_5;
-        const TRANSITION_PROP_6 = lvgl_sys::LV_STYLE_TRANSITION_PROP_6;
-        const TRANSITION_PATH = lvgl_sys::LV_STYLE_TRANSITION_PATH;
-        const SCALE_WIDTH = lvgl_sys::LV_STYLE_SCALE_WIDTH;
-        const SCALE_BORDER_WIDTH = lvgl_sys::LV_STYLE_SCALE_BORDER_WIDTH;
-        const SCALE_END_BORDER_WIDTH = lvgl_sys::LV_STYLE_SCALE_END_BORDER_WIDTH;
-        const SCALE_END_LINE_WIDTH = lvgl_sys::LV_STYLE_SCALE_END_LINE_WIDTH;
-        const SCALE_GRAD_COLOR = lvgl_sys::LV_STYLE_SCALE_GRAD_COLOR;
-        const SCALE_END_COLOR = lvgl_sys::LV_STYLE_SCALE_END_COLOR;
+        const RADIUS = lvgl_sys::LV_STYLE_RADIUS as u32;
+        const CLIP_CORNER = lvgl_sys::LV_STYLE_CLIP_CORNER as u32;
+        const SIZE = lvgl_sys::LV_STYLE_SIZE as u32;
+        const TRANSFORM_WIDTH = lvgl_sys::LV_STYLE_TRANSFORM_WIDTH as u32;
+        const TRANSFORM_HEIGHT = lvgl_sys::LV_STYLE_TRANSFORM_HEIGHT as u32;
+        const TRANSFORM_ANGLE = lvgl_sys::LV_STYLE_TRANSFORM_ANGLE as u32;
+        const TRANSFORM_ZOOM = lvgl_sys::LV_STYLE_TRANSFORM_ZOOM as u32;
+        const OPA_SCALE = lvgl_sys::LV_STYLE_OPA_SCALE as u32;
+        const PAD_TOP = lvgl_sys::LV_STYLE_PAD_TOP as u32;
+        const PAD_BOTTOM = lvgl_sys::LV_STYLE_PAD_BOTTOM as u32;
+        const PAD_LEFT = lvgl_sys::LV_STYLE_PAD_LEFT as u32;
+        const PAD_RIGHT = lvgl_sys::LV_STYLE_PAD_RIGHT as u32;
+        const PAD_INNER = lvgl_sys::LV_STYLE_PAD_INNER as u32;
+        const MARGIN_TOP = lvgl_sys::LV_STYLE_MARGIN_TOP as u32;
+        const MARGIN_BOTTOM = lvgl_sys::LV_STYLE_MARGIN_BOTTOM as u32;
+        const MARGIN_LEFT = lvgl_sys::LV_STYLE_MARGIN_LEFT as u32;
+        const MARGIN_RIGHT = lvgl_sys::LV_STYLE_MARGIN_RIGHT as u32;
+        const BG_BLEND_MODE = lvgl_sys::LV_STYLE_BG_BLEND_MODE as u32;
+        const BG_MAIN_STOP = lvgl_sys::LV_STYLE_BG_MAIN_STOP as u32;
+        const BG_GRAD_STOP = lvgl_sys::LV_STYLE_BG_GRAD_STOP as u32;
+        const BG_GRAD_DIR = lvgl_sys::LV_STYLE_BG_GRAD_DIR as u32;
+        const BG_COLOR = lvgl_sys::LV_STYLE_BG_COLOR as u32;
+        const BG_GRAD_COLOR = lvgl_sys::LV_STYLE_BG_GRAD_COLOR as u32;
+        const BG_OPA = lvgl_sys::LV_STYLE_BG_OPA as u32;
+        const BORDER_WIDTH = lvgl_sys::LV_STYLE_BORDER_WIDTH as u32;
+        const BORDER_SIDE = lvgl_sys::LV_STYLE_BORDER_SIDE as u32;
+        const BORDER_BLEND_MODE = lvgl_sys::LV_STYLE_BORDER_BLEND_MODE as u32;
+        const BORDER_POST = lvgl_sys::LV_STYLE_BORDER_POST as u32;
+        const BORDER_COLOR = lvgl_sys::LV_STYLE_BORDER_COLOR as u32;
+        const BORDER_OPA = lvgl_sys::LV_STYLE_BORDER_OPA as u32;
+        const OUTLINE_WIDTH = lvgl_sys::LV_STYLE_OUTLINE_WIDTH as u32;
+        const OUTLINE_PAD = lvgl_sys::LV_STYLE_OUTLINE_PAD as u32;
+        const OUTLINE_BLEND_MODE = lvgl_sys::LV_STYLE_OUTLINE_BLEND_MODE as u32;
+        const OUTLINE_COLOR = lvgl_sys::LV_STYLE_OUTLINE_COLOR as u32;
+        const OUTLINE_OPA = lvgl_sys::LV_STYLE_OUTLINE_OPA as u32;
+        const SHADOW_WIDTH = lvgl_sys::LV_STYLE_SHADOW_WIDTH as u32;
+        const SHADOW_OFS_X = lvgl_sys::LV_STYLE_SHADOW_OFS_X as u32;
+        const SHADOW_OFS_Y = lvgl_sys::LV_STYLE_SHADOW_OFS_Y as u32;
+        const SHADOW_SPREAD = lvgl_sys::LV_STYLE_SHADOW_SPREAD as u32;
+        const SHADOW_BLEND_MODE = lvgl_sys::LV_STYLE_SHADOW_BLEND_MODE as u32;
+        const SHADOW_COLOR = lvgl_sys::LV_STYLE_SHADOW_COLOR as u32;
+        const SHADOW_OPA = lvgl_sys::LV_STYLE_SHADOW_OPA as u32;
+        const PATTERN_BLEND_MODE = lvgl_sys::LV_STYLE_PATTERN_BLEND_MODE as u32;
+        const PATTERN_REPEAT = lvgl_sys::LV_STYLE_PATTERN_REPEAT as u32;
+        const PATTERN_RECOLOR = lvgl_sys::LV_STYLE_PATTERN_RECOLOR as u32;
+        const PATTERN_OPA = lvgl_sys::LV_STYLE_PATTERN_OPA as u32;
+        const PATTERN_RECOLOR_OPA = lvgl_sys::LV_STYLE_PATTERN_RECOLOR_OPA as u32;
+        const PATTERN_IMAGE = lvgl_sys::LV_STYLE_PATTERN_IMAGE as u32;
+        const VALUE_LETTER_SPACE = lvgl_sys::LV_STYLE_VALUE_LETTER_SPACE as u32;
+        const VALUE_LINE_SPACE = lvgl_sys::LV_STYLE_VALUE_LINE_SPACE as u32;
+        const VALUE_BLEND_MODE = lvgl_sys::LV_STYLE_VALUE_BLEND_MODE as u32;
+        const VALUE_OFS_X = lvgl_sys::LV_STYLE_VALUE_OFS_X as u32;
+        const VALUE_OFS_Y = lvgl_sys::LV_STYLE_VALUE_OFS_Y as u32;
+        const VALUE_ALIGN = lvgl_sys::LV_STYLE_VALUE_ALIGN as u32;
+        const VALUE_COLOR = lvgl_sys::LV_STYLE_VALUE_COLOR as u32;
+        const VALUE_OPA = lvgl_sys::LV_STYLE_VALUE_OPA as u32;
+        const VALUE_FONT = lvgl_sys::LV_STYLE_VALUE_FONT as u32;
+        const VALUE_STR = lvgl_sys::LV_STYLE_VALUE_STR as u32;
+        const TEXT_LETTER_SPACE = lvgl_sys::LV_STYLE_TEXT_LETTER_SPACE as u32;
+        const TEXT_LINE_SPACE = lvgl_sys::LV_STYLE_TEXT_LINE_SPACE as u32;
+        const TEXT_DECOR = lvgl_sys::LV_STYLE_TEXT_DECOR as u32;
+        const TEXT_BLEND_MODE = lvgl_sys::LV_STYLE_TEXT_BLEND_MODE as u32;
+        const TEXT_COLOR = lvgl_sys::LV_STYLE_TEXT_COLOR as u32;
+        const TEXT_SEL_COLOR = lvgl_sys::LV_STYLE_TEXT_SEL_COLOR as u32;
+        const TEXT_OPA = lvgl_sys::LV_STYLE_TEXT_OPA as u32;
+        const TEXT_FONT = lvgl_sys::LV_STYLE_TEXT_FONT as u32;
+        const LINE_WIDTH = lvgl_sys::LV_STYLE_LINE_WIDTH as u32;
+        const LINE_BLEND_MODE = lvgl_sys::LV_STYLE_LINE_BLEND_MODE as u32;
+        const LINE_DASH_WIDTH = lvgl_sys::LV_STYLE_LINE_DASH_WIDTH as u32;
+        const LINE_DASH_GAP = lvgl_sys::LV_STYLE_LINE_DASH_GAP as u32;
+        const LINE_ROUNDED = lvgl_sys::LV_STYLE_LINE_ROUNDED as u32;
+        const LINE_COLOR = lvgl_sys::LV_STYLE_LINE_COLOR as u32;
+        const LINE_OPA = lvgl_sys::LV_STYLE_LINE_OPA as u32;
+        const IMAGE_BLEND_MODE = lvgl_sys::LV_STYLE_IMAGE_BLEND_MODE as u32;
+        const IMAGE_RECOLOR = lvgl_sys::LV_STYLE_IMAGE_RECOLOR as u32;
+        const IMAGE_OPA = lvgl_sys::LV_STYLE_IMAGE_OPA as u32;
+        const IMAGE_RECOLOR_OPA = lvgl_sys::LV_STYLE_IMAGE_RECOLOR_OPA as u32;
+        const TRANSITION_TIME = lvgl_sys::LV_STYLE_TRANSITION_TIME as u32;
+        const TRANSITION_DELAY = lvgl_sys::LV_STYLE_TRANSITION_DELAY as u32;
+        const TRANSITION_PROP_1 = lvgl_sys::LV_STYLE_TRANSITION_PROP_1 as u32;
+        const TRANSITION_PROP_2 = lvgl_sys::LV_STYLE_TRANSITION_PROP_2 as u32;
+        const TRANSITION_PROP_3 = lvgl_sys::LV_STYLE_TRANSITION_PROP_3 as u32;
+        const TRANSITION_PROP_4 = lvgl_sys::LV_STYLE_TRANSITION_PROP_4 as u32;
+        const TRANSITION_PROP_5 = lvgl_sys::LV_STYLE_TRANSITION_PROP_5 as u32;
+        const TRANSITION_PROP_6 = lvgl_sys::LV_STYLE_TRANSITION_PROP_6 as u32;
+        const TRANSITION_PATH = lvgl_sys::LV_STYLE_TRANSITION_PATH as u32;
+        const SCALE_WIDTH = lvgl_sys::LV_STYLE_SCALE_WIDTH as u32;
+        const SCALE_BORDER_WIDTH = lvgl_sys::LV_STYLE_SCALE_BORDER_WIDTH as u32;
+        const SCALE_END_BORDER_WIDTH = lvgl_sys::LV_STYLE_SCALE_END_BORDER_WIDTH as u32;
+        const SCALE_END_LINE_WIDTH = lvgl_sys::LV_STYLE_SCALE_END_LINE_WIDTH as u32;
+        const SCALE_GRAD_COLOR = lvgl_sys::LV_STYLE_SCALE_GRAD_COLOR as u32;
+        const SCALE_END_COLOR = lvgl_sys::LV_STYLE_SCALE_END_COLOR as u32;
     }
 }
 
@@ -166,8 +166,8 @@ impl Style {
         unsafe {
             lvgl_sys::_lv_style_set_int(
                 self.raw.as_mut(),
-                (lvgl_sys::LV_STYLE_RADIUS | (native_state << lvgl_sys::LV_STYLE_STATE_POS as u32))
-                    as u16,
+                (lvgl_sys::LV_STYLE_RADIUS as u32
+                    | (native_state << lvgl_sys::LV_STYLE_STATE_POS as u32)) as u16,
                 value,
             );
         }
@@ -178,7 +178,7 @@ impl Style {
         unsafe {
             lvgl_sys::_lv_style_set_int(
                 self.raw.as_mut(),
-                (lvgl_sys::LV_STYLE_CLIP_CORNER
+                (lvgl_sys::LV_STYLE_CLIP_CORNER as u32
                     | (native_state << lvgl_sys::LV_STYLE_STATE_POS as u32)) as u16,
                 value,
             );
@@ -190,8 +190,8 @@ impl Style {
         unsafe {
             lvgl_sys::_lv_style_set_int(
                 self.raw.as_mut(),
-                (lvgl_sys::LV_STYLE_SIZE | (native_state << lvgl_sys::LV_STYLE_STATE_POS as u32))
-                    as u16,
+                (lvgl_sys::LV_STYLE_SIZE as u32
+                    | (native_state << lvgl_sys::LV_STYLE_STATE_POS as u32)) as u16,
                 value,
             );
         }
@@ -202,7 +202,7 @@ impl Style {
         unsafe {
             lvgl_sys::_lv_style_set_int(
                 self.raw.as_mut(),
-                (lvgl_sys::LV_STYLE_TRANSFORM_WIDTH
+                (lvgl_sys::LV_STYLE_TRANSFORM_WIDTH as u32
                     | (native_state << lvgl_sys::LV_STYLE_STATE_POS as u32)) as u16,
                 value,
             );
@@ -214,7 +214,7 @@ impl Style {
         unsafe {
             lvgl_sys::_lv_style_set_int(
                 self.raw.as_mut(),
-                (lvgl_sys::LV_STYLE_TRANSFORM_HEIGHT
+                (lvgl_sys::LV_STYLE_TRANSFORM_HEIGHT as u32
                     | (native_state << lvgl_sys::LV_STYLE_STATE_POS as u32)) as u16,
                 value,
             );
@@ -226,7 +226,7 @@ impl Style {
         unsafe {
             lvgl_sys::_lv_style_set_int(
                 self.raw.as_mut(),
-                (lvgl_sys::LV_STYLE_TRANSFORM_ANGLE
+                (lvgl_sys::LV_STYLE_TRANSFORM_ANGLE as u32
                     | (native_state << lvgl_sys::LV_STYLE_STATE_POS as u32)) as u16,
                 value,
             );
@@ -238,7 +238,7 @@ impl Style {
         unsafe {
             lvgl_sys::_lv_style_set_int(
                 self.raw.as_mut(),
-                (lvgl_sys::LV_STYLE_TRANSFORM_ZOOM
+                (lvgl_sys::LV_STYLE_TRANSFORM_ZOOM as u32
                     | (native_state << lvgl_sys::LV_STYLE_STATE_POS as u32)) as u16,
                 value,
             );
@@ -250,7 +250,7 @@ impl Style {
         unsafe {
             lvgl_sys::_lv_style_set_opa(
                 self.raw.as_mut(),
-                (lvgl_sys::LV_STYLE_OPA_SCALE
+                (lvgl_sys::LV_STYLE_OPA_SCALE as u32
                     | (native_state << lvgl_sys::LV_STYLE_STATE_POS as u32)) as u16,
                 value.into(),
             );
@@ -262,8 +262,8 @@ impl Style {
         unsafe {
             lvgl_sys::_lv_style_set_int(
                 self.raw.as_mut(),
-                (lvgl_sys::LV_STYLE_PAD_TOP | (native_state << lvgl_sys::LV_STYLE_STATE_POS as u32))
-                    as u16,
+                (lvgl_sys::LV_STYLE_PAD_TOP as u32
+                    | (native_state << lvgl_sys::LV_STYLE_STATE_POS as u32)) as u16,
                 value,
             );
         }
@@ -274,7 +274,7 @@ impl Style {
         unsafe {
             lvgl_sys::_lv_style_set_int(
                 self.raw.as_mut(),
-                (lvgl_sys::LV_STYLE_PAD_BOTTOM
+                (lvgl_sys::LV_STYLE_PAD_BOTTOM as u32
                     | (native_state << lvgl_sys::LV_STYLE_STATE_POS as u32)) as u16,
                 value,
             );
@@ -286,7 +286,7 @@ impl Style {
         unsafe {
             lvgl_sys::_lv_style_set_int(
                 self.raw.as_mut(),
-                (lvgl_sys::LV_STYLE_PAD_LEFT
+                (lvgl_sys::LV_STYLE_PAD_LEFT as u32
                     | (native_state << lvgl_sys::LV_STYLE_STATE_POS as u32)) as u16,
                 value,
             );
@@ -298,7 +298,7 @@ impl Style {
         unsafe {
             lvgl_sys::_lv_style_set_int(
                 self.raw.as_mut(),
-                (lvgl_sys::LV_STYLE_PAD_RIGHT
+                (lvgl_sys::LV_STYLE_PAD_RIGHT as u32
                     | (native_state << lvgl_sys::LV_STYLE_STATE_POS as u32)) as u16,
                 value,
             );
@@ -310,7 +310,7 @@ impl Style {
         unsafe {
             lvgl_sys::_lv_style_set_int(
                 self.raw.as_mut(),
-                (lvgl_sys::LV_STYLE_PAD_INNER
+                (lvgl_sys::LV_STYLE_PAD_INNER as u32
                     | (native_state << lvgl_sys::LV_STYLE_STATE_POS as u32)) as u16,
                 value,
             );
@@ -322,7 +322,7 @@ impl Style {
         unsafe {
             lvgl_sys::_lv_style_set_int(
                 self.raw.as_mut(),
-                (lvgl_sys::LV_STYLE_MARGIN_TOP
+                (lvgl_sys::LV_STYLE_MARGIN_TOP as u32
                     | (native_state << lvgl_sys::LV_STYLE_STATE_POS as u32)) as u16,
                 value,
             );
@@ -334,7 +334,7 @@ impl Style {
         unsafe {
             lvgl_sys::_lv_style_set_int(
                 self.raw.as_mut(),
-                (lvgl_sys::LV_STYLE_MARGIN_BOTTOM
+                (lvgl_sys::LV_STYLE_MARGIN_BOTTOM as u32
                     | (native_state << lvgl_sys::LV_STYLE_STATE_POS as u32)) as u16,
                 value,
             );
@@ -346,7 +346,7 @@ impl Style {
         unsafe {
             lvgl_sys::_lv_style_set_int(
                 self.raw.as_mut(),
-                (lvgl_sys::LV_STYLE_MARGIN_LEFT
+                (lvgl_sys::LV_STYLE_MARGIN_LEFT as u32
                     | (native_state << lvgl_sys::LV_STYLE_STATE_POS as u32)) as u16,
                 value,
             );
@@ -358,7 +358,7 @@ impl Style {
         unsafe {
             lvgl_sys::_lv_style_set_int(
                 self.raw.as_mut(),
-                (lvgl_sys::LV_STYLE_MARGIN_RIGHT
+                (lvgl_sys::LV_STYLE_MARGIN_RIGHT as u32
                     | (native_state << lvgl_sys::LV_STYLE_STATE_POS as u32)) as u16,
                 value,
             );
@@ -370,7 +370,7 @@ impl Style {
         unsafe {
             lvgl_sys::_lv_style_set_int(
                 self.raw.as_mut(),
-                (lvgl_sys::LV_STYLE_BG_BLEND_MODE
+                (lvgl_sys::LV_STYLE_BG_BLEND_MODE as u32
                     | (native_state << lvgl_sys::LV_STYLE_STATE_POS as u32)) as u16,
                 value,
             );
@@ -382,7 +382,7 @@ impl Style {
         unsafe {
             lvgl_sys::_lv_style_set_int(
                 self.raw.as_mut(),
-                (lvgl_sys::LV_STYLE_BG_MAIN_STOP
+                (lvgl_sys::LV_STYLE_BG_MAIN_STOP as u32
                     | (native_state << lvgl_sys::LV_STYLE_STATE_POS as u32)) as u16,
                 value,
             );
@@ -394,7 +394,7 @@ impl Style {
         unsafe {
             lvgl_sys::_lv_style_set_int(
                 self.raw.as_mut(),
-                (lvgl_sys::LV_STYLE_BG_GRAD_STOP
+                (lvgl_sys::LV_STYLE_BG_GRAD_STOP as u32
                     | (native_state << lvgl_sys::LV_STYLE_STATE_POS as u32)) as u16,
                 value,
             );
@@ -406,7 +406,7 @@ impl Style {
         unsafe {
             lvgl_sys::_lv_style_set_int(
                 self.raw.as_mut(),
-                (lvgl_sys::LV_STYLE_BG_GRAD_DIR
+                (lvgl_sys::LV_STYLE_BG_GRAD_DIR as u32
                     | (native_state << lvgl_sys::LV_STYLE_STATE_POS as u32)) as u16,
                 value,
             );
@@ -418,7 +418,7 @@ impl Style {
         unsafe {
             lvgl_sys::_lv_style_set_color(
                 self.raw.as_mut(),
-                (lvgl_sys::LV_STYLE_BG_COLOR
+                (lvgl_sys::LV_STYLE_BG_COLOR as u32
                     | (native_state << lvgl_sys::LV_STYLE_STATE_POS as u32)) as u16,
                 value.raw,
             );
@@ -430,7 +430,7 @@ impl Style {
         unsafe {
             lvgl_sys::_lv_style_set_color(
                 self.raw.as_mut(),
-                (lvgl_sys::LV_STYLE_BG_GRAD_COLOR
+                (lvgl_sys::LV_STYLE_BG_GRAD_COLOR as u32
                     | (native_state << lvgl_sys::LV_STYLE_STATE_POS as u32)) as u16,
                 value.raw,
             );
@@ -442,8 +442,8 @@ impl Style {
         unsafe {
             lvgl_sys::_lv_style_set_opa(
                 self.raw.as_mut(),
-                (lvgl_sys::LV_STYLE_BG_OPA | (native_state << lvgl_sys::LV_STYLE_STATE_POS as u32))
-                    as u16,
+                (lvgl_sys::LV_STYLE_BG_OPA as u32
+                    | (native_state << lvgl_sys::LV_STYLE_STATE_POS as u32)) as u16,
                 value.into(),
             );
         }
@@ -454,7 +454,7 @@ impl Style {
         unsafe {
             lvgl_sys::_lv_style_set_int(
                 self.raw.as_mut(),
-                (lvgl_sys::LV_STYLE_BORDER_WIDTH
+                (lvgl_sys::LV_STYLE_BORDER_WIDTH as u32
                     | (native_state << lvgl_sys::LV_STYLE_STATE_POS as u32)) as u16,
                 value,
             );
@@ -466,7 +466,7 @@ impl Style {
         unsafe {
             lvgl_sys::_lv_style_set_int(
                 self.raw.as_mut(),
-                (lvgl_sys::LV_STYLE_BORDER_SIDE
+                (lvgl_sys::LV_STYLE_BORDER_SIDE as u32
                     | (native_state << lvgl_sys::LV_STYLE_STATE_POS as u32)) as u16,
                 value,
             );
@@ -478,7 +478,7 @@ impl Style {
         unsafe {
             lvgl_sys::_lv_style_set_int(
                 self.raw.as_mut(),
-                (lvgl_sys::LV_STYLE_BORDER_BLEND_MODE
+                (lvgl_sys::LV_STYLE_BORDER_BLEND_MODE as u32
                     | (native_state << lvgl_sys::LV_STYLE_STATE_POS as u32)) as u16,
                 value,
             );
@@ -490,7 +490,7 @@ impl Style {
         unsafe {
             lvgl_sys::_lv_style_set_int(
                 self.raw.as_mut(),
-                (lvgl_sys::LV_STYLE_BORDER_POST
+                (lvgl_sys::LV_STYLE_BORDER_POST as u32
                     | (native_state << lvgl_sys::LV_STYLE_STATE_POS as u32)) as u16,
                 value,
             );
@@ -502,7 +502,7 @@ impl Style {
         unsafe {
             lvgl_sys::_lv_style_set_color(
                 self.raw.as_mut(),
-                (lvgl_sys::LV_STYLE_BORDER_COLOR
+                (lvgl_sys::LV_STYLE_BORDER_COLOR as u32
                     | (native_state << lvgl_sys::LV_STYLE_STATE_POS as u32)) as u16,
                 value.raw,
             );
@@ -514,7 +514,7 @@ impl Style {
         unsafe {
             lvgl_sys::_lv_style_set_opa(
                 self.raw.as_mut(),
-                (lvgl_sys::LV_STYLE_BORDER_OPA
+                (lvgl_sys::LV_STYLE_BORDER_OPA as u32
                     | (native_state << lvgl_sys::LV_STYLE_STATE_POS as u32)) as u16,
                 value.into(),
             );
@@ -526,7 +526,7 @@ impl Style {
         unsafe {
             lvgl_sys::_lv_style_set_int(
                 self.raw.as_mut(),
-                (lvgl_sys::LV_STYLE_OUTLINE_WIDTH
+                (lvgl_sys::LV_STYLE_OUTLINE_WIDTH as u32
                     | (native_state << lvgl_sys::LV_STYLE_STATE_POS as u32)) as u16,
                 value,
             );
@@ -538,7 +538,7 @@ impl Style {
         unsafe {
             lvgl_sys::_lv_style_set_int(
                 self.raw.as_mut(),
-                (lvgl_sys::LV_STYLE_OUTLINE_PAD
+                (lvgl_sys::LV_STYLE_OUTLINE_PAD as u32
                     | (native_state << lvgl_sys::LV_STYLE_STATE_POS as u32)) as u16,
                 value,
             );
@@ -550,7 +550,7 @@ impl Style {
         unsafe {
             lvgl_sys::_lv_style_set_int(
                 self.raw.as_mut(),
-                (lvgl_sys::LV_STYLE_OUTLINE_BLEND_MODE
+                (lvgl_sys::LV_STYLE_OUTLINE_BLEND_MODE as u32
                     | (native_state << lvgl_sys::LV_STYLE_STATE_POS as u32)) as u16,
                 value,
             );
@@ -562,7 +562,7 @@ impl Style {
         unsafe {
             lvgl_sys::_lv_style_set_color(
                 self.raw.as_mut(),
-                (lvgl_sys::LV_STYLE_OUTLINE_COLOR
+                (lvgl_sys::LV_STYLE_OUTLINE_COLOR as u32
                     | (native_state << lvgl_sys::LV_STYLE_STATE_POS as u32)) as u16,
                 value.raw,
             );
@@ -574,7 +574,7 @@ impl Style {
         unsafe {
             lvgl_sys::_lv_style_set_opa(
                 self.raw.as_mut(),
-                (lvgl_sys::LV_STYLE_OUTLINE_OPA
+                (lvgl_sys::LV_STYLE_OUTLINE_OPA as u32
                     | (native_state << lvgl_sys::LV_STYLE_STATE_POS as u32)) as u16,
                 value.into(),
             );
@@ -586,7 +586,7 @@ impl Style {
         unsafe {
             lvgl_sys::_lv_style_set_int(
                 self.raw.as_mut(),
-                (lvgl_sys::LV_STYLE_SHADOW_WIDTH
+                (lvgl_sys::LV_STYLE_SHADOW_WIDTH as u32
                     | (native_state << lvgl_sys::LV_STYLE_STATE_POS as u32)) as u16,
                 value,
             );
@@ -598,7 +598,7 @@ impl Style {
         unsafe {
             lvgl_sys::_lv_style_set_int(
                 self.raw.as_mut(),
-                (lvgl_sys::LV_STYLE_SHADOW_OFS_X
+                (lvgl_sys::LV_STYLE_SHADOW_OFS_X as u32
                     | (native_state << lvgl_sys::LV_STYLE_STATE_POS as u32)) as u16,
                 value,
             );
@@ -610,7 +610,7 @@ impl Style {
         unsafe {
             lvgl_sys::_lv_style_set_int(
                 self.raw.as_mut(),
-                (lvgl_sys::LV_STYLE_SHADOW_OFS_Y
+                (lvgl_sys::LV_STYLE_SHADOW_OFS_Y as u32
                     | (native_state << lvgl_sys::LV_STYLE_STATE_POS as u32)) as u16,
                 value,
             );
@@ -622,7 +622,7 @@ impl Style {
         unsafe {
             lvgl_sys::_lv_style_set_int(
                 self.raw.as_mut(),
-                (lvgl_sys::LV_STYLE_SHADOW_SPREAD
+                (lvgl_sys::LV_STYLE_SHADOW_SPREAD as u32
                     | (native_state << lvgl_sys::LV_STYLE_STATE_POS as u32)) as u16,
                 value,
             );
@@ -634,7 +634,7 @@ impl Style {
         unsafe {
             lvgl_sys::_lv_style_set_int(
                 self.raw.as_mut(),
-                (lvgl_sys::LV_STYLE_SHADOW_BLEND_MODE
+                (lvgl_sys::LV_STYLE_SHADOW_BLEND_MODE as u32
                     | (native_state << lvgl_sys::LV_STYLE_STATE_POS as u32)) as u16,
                 value,
             );
@@ -646,7 +646,7 @@ impl Style {
         unsafe {
             lvgl_sys::_lv_style_set_color(
                 self.raw.as_mut(),
-                (lvgl_sys::LV_STYLE_SHADOW_COLOR
+                (lvgl_sys::LV_STYLE_SHADOW_COLOR as u32
                     | (native_state << lvgl_sys::LV_STYLE_STATE_POS as u32)) as u16,
                 value.raw,
             );
@@ -658,7 +658,7 @@ impl Style {
         unsafe {
             lvgl_sys::_lv_style_set_opa(
                 self.raw.as_mut(),
-                (lvgl_sys::LV_STYLE_SHADOW_OPA
+                (lvgl_sys::LV_STYLE_SHADOW_OPA as u32
                     | (native_state << lvgl_sys::LV_STYLE_STATE_POS as u32)) as u16,
                 value.into(),
             );
@@ -670,7 +670,7 @@ impl Style {
         unsafe {
             lvgl_sys::_lv_style_set_int(
                 self.raw.as_mut(),
-                (lvgl_sys::LV_STYLE_PATTERN_REPEAT
+                (lvgl_sys::LV_STYLE_PATTERN_REPEAT as u32
                     | (native_state << lvgl_sys::LV_STYLE_STATE_POS as u32)) as u16,
                 value,
             );
@@ -682,7 +682,7 @@ impl Style {
         unsafe {
             lvgl_sys::_lv_style_set_int(
                 self.raw.as_mut(),
-                (lvgl_sys::LV_STYLE_PATTERN_BLEND_MODE
+                (lvgl_sys::LV_STYLE_PATTERN_BLEND_MODE as u32
                     | (native_state << lvgl_sys::LV_STYLE_STATE_POS as u32)) as u16,
                 value,
             );
@@ -694,7 +694,7 @@ impl Style {
         unsafe {
             lvgl_sys::_lv_style_set_color(
                 self.raw.as_mut(),
-                (lvgl_sys::LV_STYLE_PATTERN_RECOLOR
+                (lvgl_sys::LV_STYLE_PATTERN_RECOLOR as u32
                     | (native_state << lvgl_sys::LV_STYLE_STATE_POS as u32)) as u16,
                 value.raw,
             );
@@ -706,7 +706,7 @@ impl Style {
         unsafe {
             lvgl_sys::_lv_style_set_opa(
                 self.raw.as_mut(),
-                (lvgl_sys::LV_STYLE_PATTERN_OPA
+                (lvgl_sys::LV_STYLE_PATTERN_OPA as u32
                     | (native_state << lvgl_sys::LV_STYLE_STATE_POS as u32)) as u16,
                 value.into(),
             );
@@ -718,7 +718,7 @@ impl Style {
         unsafe {
             lvgl_sys::_lv_style_set_opa(
                 self.raw.as_mut(),
-                (lvgl_sys::LV_STYLE_PATTERN_RECOLOR_OPA
+                (lvgl_sys::LV_STYLE_PATTERN_RECOLOR_OPA as u32
                     | (native_state << lvgl_sys::LV_STYLE_STATE_POS as u32)) as u16,
                 value.into(),
             );
@@ -730,7 +730,7 @@ impl Style {
         unsafe {
             lvgl_sys::_lv_style_set_int(
                 self.raw.as_mut(),
-                (lvgl_sys::LV_STYLE_VALUE_LETTER_SPACE
+                (lvgl_sys::LV_STYLE_VALUE_LETTER_SPACE as u32
                     | (native_state << lvgl_sys::LV_STYLE_STATE_POS as u32)) as u16,
                 value,
             );
@@ -742,7 +742,7 @@ impl Style {
         unsafe {
             lvgl_sys::_lv_style_set_int(
                 self.raw.as_mut(),
-                (lvgl_sys::LV_STYLE_VALUE_LINE_SPACE
+                (lvgl_sys::LV_STYLE_VALUE_LINE_SPACE as u32
                     | (native_state << lvgl_sys::LV_STYLE_STATE_POS as u32)) as u16,
                 value,
             );
@@ -754,7 +754,7 @@ impl Style {
         unsafe {
             lvgl_sys::_lv_style_set_int(
                 self.raw.as_mut(),
-                (lvgl_sys::LV_STYLE_VALUE_BLEND_MODE
+                (lvgl_sys::LV_STYLE_VALUE_BLEND_MODE as u32
                     | (native_state << lvgl_sys::LV_STYLE_STATE_POS as u32)) as u16,
                 value,
             );
@@ -766,7 +766,7 @@ impl Style {
         unsafe {
             lvgl_sys::_lv_style_set_int(
                 self.raw.as_mut(),
-                (lvgl_sys::LV_STYLE_VALUE_OFS_X
+                (lvgl_sys::LV_STYLE_VALUE_OFS_X as u32
                     | (native_state << lvgl_sys::LV_STYLE_STATE_POS as u32)) as u16,
                 value,
             );
@@ -778,7 +778,7 @@ impl Style {
         unsafe {
             lvgl_sys::_lv_style_set_int(
                 self.raw.as_mut(),
-                (lvgl_sys::LV_STYLE_VALUE_OFS_Y
+                (lvgl_sys::LV_STYLE_VALUE_OFS_Y as u32
                     | (native_state << lvgl_sys::LV_STYLE_STATE_POS as u32)) as u16,
                 value,
             );
@@ -790,7 +790,7 @@ impl Style {
         unsafe {
             lvgl_sys::_lv_style_set_int(
                 self.raw.as_mut(),
-                (lvgl_sys::LV_STYLE_VALUE_ALIGN
+                (lvgl_sys::LV_STYLE_VALUE_ALIGN as u32
                     | (native_state << lvgl_sys::LV_STYLE_STATE_POS as u32)) as u16,
                 value,
             );
@@ -802,7 +802,7 @@ impl Style {
         unsafe {
             lvgl_sys::_lv_style_set_color(
                 self.raw.as_mut(),
-                (lvgl_sys::LV_STYLE_VALUE_COLOR
+                (lvgl_sys::LV_STYLE_VALUE_COLOR as u32
                     | (native_state << lvgl_sys::LV_STYLE_STATE_POS as u32)) as u16,
                 value.raw,
             );
@@ -814,7 +814,7 @@ impl Style {
         unsafe {
             lvgl_sys::_lv_style_set_opa(
                 self.raw.as_mut(),
-                (lvgl_sys::LV_STYLE_VALUE_OPA
+                (lvgl_sys::LV_STYLE_VALUE_OPA as u32
                     | (native_state << lvgl_sys::LV_STYLE_STATE_POS as u32)) as u16,
                 value.into(),
             );
@@ -826,7 +826,7 @@ impl Style {
         unsafe {
             lvgl_sys::_lv_style_set_int(
                 self.raw.as_mut(),
-                (lvgl_sys::LV_STYLE_TEXT_LETTER_SPACE
+                (lvgl_sys::LV_STYLE_TEXT_LETTER_SPACE as u32
                     | (native_state << lvgl_sys::LV_STYLE_STATE_POS as u32)) as u16,
                 value,
             );
@@ -838,7 +838,7 @@ impl Style {
         unsafe {
             lvgl_sys::_lv_style_set_int(
                 self.raw.as_mut(),
-                (lvgl_sys::LV_STYLE_TEXT_LINE_SPACE
+                (lvgl_sys::LV_STYLE_TEXT_LINE_SPACE as u32
                     | (native_state << lvgl_sys::LV_STYLE_STATE_POS as u32)) as u16,
                 value,
             );
@@ -850,7 +850,7 @@ impl Style {
         unsafe {
             lvgl_sys::_lv_style_set_int(
                 self.raw.as_mut(),
-                (lvgl_sys::LV_STYLE_TEXT_DECOR
+                (lvgl_sys::LV_STYLE_TEXT_DECOR as u32
                     | (native_state << lvgl_sys::LV_STYLE_STATE_POS as u32)) as u16,
                 value,
             );
@@ -862,7 +862,7 @@ impl Style {
         unsafe {
             lvgl_sys::_lv_style_set_int(
                 self.raw.as_mut(),
-                (lvgl_sys::LV_STYLE_TEXT_BLEND_MODE
+                (lvgl_sys::LV_STYLE_TEXT_BLEND_MODE as u32
                     | (native_state << lvgl_sys::LV_STYLE_STATE_POS as u32)) as u16,
                 value,
             );
@@ -874,7 +874,7 @@ impl Style {
         unsafe {
             lvgl_sys::_lv_style_set_color(
                 self.raw.as_mut(),
-                (lvgl_sys::LV_STYLE_TEXT_COLOR
+                (lvgl_sys::LV_STYLE_TEXT_COLOR as u32
                     | (native_state << lvgl_sys::LV_STYLE_STATE_POS as u32)) as u16,
                 value.raw,
             );
@@ -886,7 +886,7 @@ impl Style {
         unsafe {
             lvgl_sys::_lv_style_set_color(
                 self.raw.as_mut(),
-                (lvgl_sys::LV_STYLE_TEXT_SEL_COLOR
+                (lvgl_sys::LV_STYLE_TEXT_SEL_COLOR as u32
                     | (native_state << lvgl_sys::LV_STYLE_STATE_POS as u32)) as u16,
                 value.raw,
             );
@@ -898,7 +898,7 @@ impl Style {
         unsafe {
             lvgl_sys::_lv_style_set_opa(
                 self.raw.as_mut(),
-                (lvgl_sys::LV_STYLE_TEXT_OPA
+                (lvgl_sys::LV_STYLE_TEXT_OPA as u32
                     | (native_state << lvgl_sys::LV_STYLE_STATE_POS as u32)) as u16,
                 value.into(),
             );
@@ -910,7 +910,7 @@ impl Style {
         unsafe {
             lvgl_sys::_lv_style_set_int(
                 self.raw.as_mut(),
-                (lvgl_sys::LV_STYLE_LINE_WIDTH
+                (lvgl_sys::LV_STYLE_LINE_WIDTH as u32
                     | (native_state << lvgl_sys::LV_STYLE_STATE_POS as u32)) as u16,
                 value,
             );
@@ -922,7 +922,7 @@ impl Style {
         unsafe {
             lvgl_sys::_lv_style_set_int(
                 self.raw.as_mut(),
-                (lvgl_sys::LV_STYLE_LINE_BLEND_MODE
+                (lvgl_sys::LV_STYLE_LINE_BLEND_MODE as u32
                     | (native_state << lvgl_sys::LV_STYLE_STATE_POS as u32)) as u16,
                 value,
             );
@@ -934,7 +934,7 @@ impl Style {
         unsafe {
             lvgl_sys::_lv_style_set_int(
                 self.raw.as_mut(),
-                (lvgl_sys::LV_STYLE_LINE_DASH_WIDTH
+                (lvgl_sys::LV_STYLE_LINE_DASH_WIDTH as u32
                     | (native_state << lvgl_sys::LV_STYLE_STATE_POS as u32)) as u16,
                 value,
             );
@@ -946,7 +946,7 @@ impl Style {
         unsafe {
             lvgl_sys::_lv_style_set_int(
                 self.raw.as_mut(),
-                (lvgl_sys::LV_STYLE_LINE_DASH_GAP
+                (lvgl_sys::LV_STYLE_LINE_DASH_GAP as u32
                     | (native_state << lvgl_sys::LV_STYLE_STATE_POS as u32)) as u16,
                 value,
             );
@@ -958,7 +958,7 @@ impl Style {
         unsafe {
             lvgl_sys::_lv_style_set_int(
                 self.raw.as_mut(),
-                (lvgl_sys::LV_STYLE_LINE_ROUNDED
+                (lvgl_sys::LV_STYLE_LINE_ROUNDED as u32
                     | (native_state << lvgl_sys::LV_STYLE_STATE_POS as u32)) as u16,
                 value,
             );
@@ -970,7 +970,7 @@ impl Style {
         unsafe {
             lvgl_sys::_lv_style_set_color(
                 self.raw.as_mut(),
-                (lvgl_sys::LV_STYLE_LINE_COLOR
+                (lvgl_sys::LV_STYLE_LINE_COLOR as u32
                     | (native_state << lvgl_sys::LV_STYLE_STATE_POS as u32)) as u16,
                 value.raw,
             );
@@ -982,7 +982,7 @@ impl Style {
         unsafe {
             lvgl_sys::_lv_style_set_opa(
                 self.raw.as_mut(),
-                (lvgl_sys::LV_STYLE_LINE_OPA
+                (lvgl_sys::LV_STYLE_LINE_OPA as u32
                     | (native_state << lvgl_sys::LV_STYLE_STATE_POS as u32)) as u16,
                 value.into(),
             );
@@ -994,7 +994,7 @@ impl Style {
         unsafe {
             lvgl_sys::_lv_style_set_int(
                 self.raw.as_mut(),
-                (lvgl_sys::LV_STYLE_IMAGE_BLEND_MODE
+                (lvgl_sys::LV_STYLE_IMAGE_BLEND_MODE as u32
                     | (native_state << lvgl_sys::LV_STYLE_STATE_POS as u32)) as u16,
                 value,
             );
@@ -1006,7 +1006,7 @@ impl Style {
         unsafe {
             lvgl_sys::_lv_style_set_color(
                 self.raw.as_mut(),
-                (lvgl_sys::LV_STYLE_IMAGE_RECOLOR
+                (lvgl_sys::LV_STYLE_IMAGE_RECOLOR as u32
                     | (native_state << lvgl_sys::LV_STYLE_STATE_POS as u32)) as u16,
                 value.raw,
             );
@@ -1018,7 +1018,7 @@ impl Style {
         unsafe {
             lvgl_sys::_lv_style_set_opa(
                 self.raw.as_mut(),
-                (lvgl_sys::LV_STYLE_IMAGE_OPA
+                (lvgl_sys::LV_STYLE_IMAGE_OPA as u32
                     | (native_state << lvgl_sys::LV_STYLE_STATE_POS as u32)) as u16,
                 value.into(),
             );
@@ -1030,7 +1030,7 @@ impl Style {
         unsafe {
             lvgl_sys::_lv_style_set_opa(
                 self.raw.as_mut(),
-                (lvgl_sys::LV_STYLE_IMAGE_RECOLOR_OPA
+                (lvgl_sys::LV_STYLE_IMAGE_RECOLOR_OPA as u32
                     | (native_state << lvgl_sys::LV_STYLE_STATE_POS as u32)) as u16,
                 value.into(),
             );
@@ -1042,7 +1042,7 @@ impl Style {
         unsafe {
             lvgl_sys::_lv_style_set_int(
                 self.raw.as_mut(),
-                (lvgl_sys::LV_STYLE_TRANSITION_TIME
+                (lvgl_sys::LV_STYLE_TRANSITION_TIME as u32
                     | (native_state << lvgl_sys::LV_STYLE_STATE_POS as u32)) as u16,
                 value,
             );
@@ -1054,7 +1054,7 @@ impl Style {
         unsafe {
             lvgl_sys::_lv_style_set_int(
                 self.raw.as_mut(),
-                (lvgl_sys::LV_STYLE_TRANSITION_DELAY
+                (lvgl_sys::LV_STYLE_TRANSITION_DELAY as u32
                     | (native_state << lvgl_sys::LV_STYLE_STATE_POS as u32)) as u16,
                 value,
             );
@@ -1066,7 +1066,7 @@ impl Style {
         unsafe {
             lvgl_sys::_lv_style_set_int(
                 self.raw.as_mut(),
-                (lvgl_sys::LV_STYLE_TRANSITION_PROP_1
+                (lvgl_sys::LV_STYLE_TRANSITION_PROP_1 as u32
                     | (native_state << lvgl_sys::LV_STYLE_STATE_POS as u32)) as u16,
                 value,
             );
@@ -1078,7 +1078,7 @@ impl Style {
         unsafe {
             lvgl_sys::_lv_style_set_int(
                 self.raw.as_mut(),
-                (lvgl_sys::LV_STYLE_TRANSITION_PROP_2
+                (lvgl_sys::LV_STYLE_TRANSITION_PROP_2 as u32
                     | (native_state << lvgl_sys::LV_STYLE_STATE_POS as u32)) as u16,
                 value,
             );
@@ -1090,7 +1090,7 @@ impl Style {
         unsafe {
             lvgl_sys::_lv_style_set_int(
                 self.raw.as_mut(),
-                (lvgl_sys::LV_STYLE_TRANSITION_PROP_3
+                (lvgl_sys::LV_STYLE_TRANSITION_PROP_3 as u32
                     | (native_state << lvgl_sys::LV_STYLE_STATE_POS as u32)) as u16,
                 value,
             );
@@ -1102,7 +1102,7 @@ impl Style {
         unsafe {
             lvgl_sys::_lv_style_set_int(
                 self.raw.as_mut(),
-                (lvgl_sys::LV_STYLE_TRANSITION_PROP_4
+                (lvgl_sys::LV_STYLE_TRANSITION_PROP_4 as u32
                     | (native_state << lvgl_sys::LV_STYLE_STATE_POS as u32)) as u16,
                 value,
             );
@@ -1114,7 +1114,7 @@ impl Style {
         unsafe {
             lvgl_sys::_lv_style_set_int(
                 self.raw.as_mut(),
-                (lvgl_sys::LV_STYLE_TRANSITION_PROP_5
+                (lvgl_sys::LV_STYLE_TRANSITION_PROP_5 as u32
                     | (native_state << lvgl_sys::LV_STYLE_STATE_POS as u32)) as u16,
                 value,
             );
@@ -1126,7 +1126,7 @@ impl Style {
         unsafe {
             lvgl_sys::_lv_style_set_int(
                 self.raw.as_mut(),
-                (lvgl_sys::LV_STYLE_TRANSITION_PROP_6
+                (lvgl_sys::LV_STYLE_TRANSITION_PROP_6 as u32
                     | (native_state << lvgl_sys::LV_STYLE_STATE_POS as u32)) as u16,
                 value,
             );
@@ -1138,7 +1138,7 @@ impl Style {
         unsafe {
             lvgl_sys::_lv_style_set_int(
                 self.raw.as_mut(),
-                (lvgl_sys::LV_STYLE_SCALE_WIDTH
+                (lvgl_sys::LV_STYLE_SCALE_WIDTH as u32
                     | (native_state << lvgl_sys::LV_STYLE_STATE_POS as u32)) as u16,
                 value,
             );
@@ -1150,7 +1150,7 @@ impl Style {
         unsafe {
             lvgl_sys::_lv_style_set_int(
                 self.raw.as_mut(),
-                (lvgl_sys::LV_STYLE_SCALE_BORDER_WIDTH
+                (lvgl_sys::LV_STYLE_SCALE_BORDER_WIDTH as u32
                     | (native_state << lvgl_sys::LV_STYLE_STATE_POS as u32)) as u16,
                 value,
             );
@@ -1162,7 +1162,7 @@ impl Style {
         unsafe {
             lvgl_sys::_lv_style_set_int(
                 self.raw.as_mut(),
-                (lvgl_sys::LV_STYLE_SCALE_END_BORDER_WIDTH
+                (lvgl_sys::LV_STYLE_SCALE_END_BORDER_WIDTH as u32
                     | (native_state << lvgl_sys::LV_STYLE_STATE_POS as u32)) as u16,
                 value,
             );
@@ -1174,7 +1174,7 @@ impl Style {
         unsafe {
             lvgl_sys::_lv_style_set_int(
                 self.raw.as_mut(),
-                (lvgl_sys::LV_STYLE_SCALE_END_LINE_WIDTH
+                (lvgl_sys::LV_STYLE_SCALE_END_LINE_WIDTH as u32
                     | (native_state << lvgl_sys::LV_STYLE_STATE_POS as u32)) as u16,
                 value,
             );
@@ -1186,8 +1186,8 @@ impl Style {
         unsafe {
             lvgl_sys::_lv_style_set_color(
                 self.raw.as_mut(),
-                (lvgl_sys::LV_STYLE_SCALE_GRAD_COLOR
-                    | (native_state << lvgl_sys::LV_STYLE_STATE_POS as u32)) as u16,
+                (lvgl_sys::LV_STYLE_SCALE_GRAD_COLOR as u32
+                    | (native_state << lvgl_sys::LV_STYLE_STATE_POS)) as u16,
                 value.raw,
             );
         }
@@ -1198,8 +1198,8 @@ impl Style {
         unsafe {
             lvgl_sys::_lv_style_set_color(
                 self.raw.as_mut(),
-                (lvgl_sys::LV_STYLE_SCALE_END_COLOR
-                    | (native_state << lvgl_sys::LV_STYLE_STATE_POS as u32)) as u16,
+                (lvgl_sys::LV_STYLE_SCALE_END_COLOR as u32
+                    | (native_state << lvgl_sys::LV_STYLE_STATE_POS)) as u16,
                 value.raw,
             );
         }

lvgl/src/mem.rs

@@ -0,0 +1,174 @@
+use core::mem;
+use core::ops::{Deref, DerefMut};
+use core::ptr::NonNull;
+
+/// Places a sized `T` into LVGL memory.
+///
+/// This is useful for cases when we need to allocate memory on Rust side
+/// and handover the management of that memory to LVGL. May also be used in cases we
+/// want to use dynamic memory in the Rust side.
+pub(crate) struct Box<T>(NonNull<T>);
+
+impl<T> Box<T> {
+    /// Allocate memory using LVGL memory API and place `T` in the LVGL tracked memory.
+    pub fn new(value: T) -> Box<T> {
+        let size = mem::size_of::<T>();
+        let inner = unsafe {
+            let ptr = lvgl_sys::lv_mem_alloc(size as lvgl_sys::size_t) as *mut T;
+
+            // LVGL should align the memory address for us!
+            assert_eq!(
+                ptr as usize % mem::align_of::<T>(),
+                0,
+                "Memory address not aligned!"
+            );
+
+            NonNull::new(ptr)
+                .map(|p| {
+                    p.as_ptr().write(value);
+                    p
+                })
+                .unwrap_or_else(|| {
+                    panic!("Could not allocate memory {} bytes", size);
+                })
+        };
+        Box(inner)
+    }
+
+    pub fn into_raw(self) -> *mut T {
+        let b = mem::ManuallyDrop::new(self);
+        b.0.as_ptr()
+    }
+}
+
+impl<T> Drop for Box<T> {
+    fn drop(&mut self) {
+        unsafe {
+            lvgl_sys::lv_mem_free(self.0.as_ptr() as *const cty::c_void);
+        }
+    }
+}
+
+impl<T> DerefMut for Box<T> {
+    fn deref_mut(&mut self) -> &mut Self::Target {
+        self.as_mut()
+    }
+}
+
+impl<T> Deref for Box<T> {
+    type Target = T;
+
+    fn deref(&self) -> &Self::Target {
+        unsafe { self.0.as_ref() }
+    }
+}
+
+impl<T> AsMut<T> for Box<T> {
+    fn as_mut(&mut self) -> &mut T {
+        unsafe { self.0.as_mut() }
+    }
+}
+
+impl<T: Clone> Clone for Box<T> {
+    fn clone(&self) -> Self {
+        unsafe { Self::new(self.0.as_ref().clone()) }
+    }
+}
+
+#[cfg(test)]
+mod test {
+    use super::*;
+    use std::vec::Vec;
+
+    #[test]
+    fn place_value_in_lv_mem() {
+        crate::lvgl_init();
+
+        let v = Box::new(5);
+        drop(v);
+        let v = Box::new(10);
+        drop(v);
+    }
+
+    #[test]
+    fn place_complex_value_in_lv_mem() {
+        crate::lvgl_init();
+
+        #[repr(C)]
+        #[derive(Debug)]
+        struct Point {
+            x: u64,
+            y: i8,
+            t: i32,
+            disp: i32,
+        }
+
+        let initial_mem_info = mem_info();
+
+        let mut keep = Vec::new();
+        for i in 0..100 {
+            let p = Point {
+                x: i,
+                y: 42,
+                t: 0,
+                disp: -100,
+            };
+
+            println!("{:?}", p);
+            let mut b = Box::new(p);
+
+            println!("memory address is {:p}", b.as_mut());
+
+            let point = b.as_mut();
+            if point.x != i {
+                println!("{:?}", point);
+            }
+            assert_eq!(point.x, i);
+
+            let info = mem_info();
+            println!("mem info: {:?}", &info);
+            keep.push(b);
+        }
+        drop(keep);
+
+        unsafe {
+            lvgl_sys::lv_mem_defrag();
+        }
+
+        let final_info = mem_info();
+        println!("mem info: {:?}", &final_info);
+
+        // If this fails, we are leaking memory! BOOM! \o/
+        assert_eq!(initial_mem_info.free_size, final_info.free_size)
+    }
+
+    #[test]
+    fn clone_object_in_lv_mem() {
+        crate::lvgl_init();
+
+        let v1 = Box::new(5);
+        let v2 = v1.clone();
+
+        // Ensure that the two objects have identical values.
+        assert_eq!(*v1, *v2);
+        // They should have different memory addresses, however.
+        assert_ne!(v1.into_raw() as usize, v2.into_raw() as usize);
+    }
+
+    fn mem_info() -> lvgl_sys::lv_mem_monitor_t {
+        let mut info = lvgl_sys::lv_mem_monitor_t {
+            total_size: 0,
+            free_cnt: 0,
+            free_size: 0,
+            free_biggest_size: 0,
+            used_cnt: 0,
+            max_used: 0,
+            used_pct: 0,
+            frag_pct: 0,
+        };
+        unsafe {
+            lvgl_sys::lv_mem_monitor(&mut info as *mut _);
+        }
+        info
+    }
+}

lvgl/src/support.rs

@@ -1,8 +1,6 @@
 use crate::Widget;
-use bitflags::_core::option::NoneError;
 use core::convert::{TryFrom, TryInto};
 use core::ptr::NonNull;
-use cstr_core::NulError;
 use embedded_graphics::pixelcolor::{Rgb565, Rgb888};
 
 pub type LvResult<T> = Result<T, LvError>;
@@ -11,22 +9,10 @@ pub type LvResult<T> = Result<T, LvError>;
 pub enum LvError {
     InvalidReference,
     Uninitialized,
-    InvalidNulByteString,
+    LvOOMemory,
     AlreadyInUse,
 }
 
-impl From<NoneError> for LvError {
-    fn from(_: NoneError) -> Self {
-        LvError::InvalidReference
-    }
-}
-
-impl From<NulError> for LvError {
-    fn from(_: NulError) -> Self {
-        LvError::InvalidNulByteString
-    }
-}
-
 #[derive(Clone)]
 pub struct Color {
     pub(crate) raw: lvgl_sys::lv_color_t,
@@ -41,6 +27,18 @@ impl Color {
     pub fn from_raw(raw: lvgl_sys::lv_color_t) -> Self {
         Self { raw }
     }
+
+    pub fn r(&self) -> u8 {
+        unsafe { lvgl_sys::_LV_COLOR_GET_R(self.raw) as u8 }
+    }
+
+    pub fn g(&self) -> u8 {
+        unsafe { lvgl_sys::_LV_COLOR_GET_G(self.raw) as u8 }
+    }
+
+    pub fn b(&self) -> u8 {
+        unsafe { lvgl_sys::_LV_COLOR_GET_B(self.raw) as u8 }
+    }
 }
 
 impl From<Color> for Rgb888 {
@@ -67,7 +65,7 @@ impl From<Color> for Rgb565 {
     }
 }
 
-/// Events are triggered in LittlevGL when something happens which might be interesting to
+/// Events are triggered in LVGL when something happens which might be interesting to
 /// the user, e.g. if an object:
 ///  - is clicked
 ///  - is dragged
@@ -114,23 +112,25 @@ impl<S> TryFrom<lvgl_sys::lv_event_t> for Event<S> {
     type Error = ();
 
     fn try_from(value: u8) -> Result<Self, Self::Error> {
+        const LV_EVENT_PRESSED: u32 = lvgl_sys::LV_EVENT_PRESSED as u32;
+        const LV_EVENT_PRESSING: u32 = lvgl_sys::LV_EVENT_PRESSING as u32;
+        const LV_EVENT_PRESS_LOST: u32 = lvgl_sys::LV_EVENT_PRESS_LOST as u32;
+        const LV_EVENT_SHORT_CLICKED: u32 = lvgl_sys::LV_EVENT_SHORT_CLICKED as u32;
+        const LV_EVENT_CLICKED: u32 = lvgl_sys::LV_EVENT_CLICKED as u32;
+        const LV_EVENT_LONG_PRESSED: u32 = lvgl_sys::LV_EVENT_LONG_PRESSED as u32;
+        const LV_EVENT_LONG_PRESSED_REPEAT: u32 = lvgl_sys::LV_EVENT_LONG_PRESSED_REPEAT as u32;
+        const LV_EVENT_RELEASED: u32 = lvgl_sys::LV_EVENT_RELEASED as u32;
+
         match value as u32 {
-            lvgl_sys::LV_EVENT_PRESSED => Ok(Event::Pressed),
-            lvgl_sys::LV_EVENT_PRESSING => Ok(Event::Pressing),
-            lvgl_sys::LV_EVENT_PRESS_LOST => Ok(Event::PressLost),
-            lvgl_sys::LV_EVENT_SHORT_CLICKED => Ok(Event::ShortClicked),
-            lvgl_sys::LV_EVENT_CLICKED => Ok(Event::Clicked),
-            lvgl_sys::LV_EVENT_LONG_PRESSED => Ok(Event::LongPressed),
-            lvgl_sys::LV_EVENT_LONG_PRESSED_REPEAT => Ok(Event::LongPressedRepeat),
-            lvgl_sys::LV_EVENT_RELEASED => Ok(Event::Released),
+            LV_EVENT_PRESSED => Ok(Event::Pressed),
+            LV_EVENT_PRESSING => Ok(Event::Pressing),
+            LV_EVENT_PRESS_LOST => Ok(Event::PressLost),
+            LV_EVENT_SHORT_CLICKED => Ok(Event::ShortClicked),
+            LV_EVENT_CLICKED => Ok(Event::Clicked),
+            LV_EVENT_LONG_PRESSED => Ok(Event::LongPressed),
+            LV_EVENT_LONG_PRESSED_REPEAT => Ok(Event::LongPressedRepeat),
+            LV_EVENT_RELEASED => Ok(Event::Released),
             _ => Err(()),
-            // _ => {
-            //     if let Ok(special_event_type) = S::try_from(value) {
-            //         Ok(Event::Special(special_event_type))
-            //     } else {
-            //         Err(())
-            //     }
-            // }
         }
     }
 }
@@ -203,9 +203,9 @@ pub enum Align {
     OutRightBottom,
 }
 
-impl Into<u8> for Align {
-    fn into(self) -> u8 {
-        let native = match self {
+impl From<Align> for u8 {
+    fn from(self_: Align) -> u8 {
+        let native = match self_ {
             Align::Center => lvgl_sys::LV_ALIGN_CENTER,
             Align::InTopLeft => lvgl_sys::LV_ALIGN_IN_TOP_LEFT,
             Align::InTopMid => lvgl_sys::LV_ALIGN_IN_TOP_MID,
@@ -245,3 +245,23 @@ impl From<Animation> for lvgl_sys::lv_anim_enable_t {
         }
     }
 }
+
+#[cfg(test)]
+mod test {
+    use super::*;
+
+    #[test]
+    fn color_properties_accessible() {
+        let color = Color::from_rgb((206, 51, 255));
+
+        if lvgl_sys::LV_COLOR_DEPTH == 32 {
+            assert_eq!(color.r(), 206);
+            assert_eq!(color.g(), 51);
+            assert_eq!(color.b(), 255);
+        } else if lvgl_sys::LV_COLOR_DEPTH == 16 {
+            assert_eq!(color.r(), 25);
+            assert_eq!(color.g(), 12);
+            assert_eq!(color.b(), 31);
+        }
+    }
+}

lvgl/src/ui.rs

@@ -0,0 +1,200 @@
+use crate::Box;
+use crate::{Color, Event, LvError, LvResult, Obj, Widget};
+use core::marker::PhantomData;
+use core::mem::MaybeUninit;
+use core::ptr;
+use core::ptr::NonNull;
+use core::sync::atomic::{AtomicBool, Ordering};
+use core::time::Duration;
+use embedded_graphics::draw_target::DrawTarget;
+use embedded_graphics::prelude::*;
+use embedded_graphics::{pixelcolor::PixelColor, Pixel};
+
+// There can only be a single reference to LVGL library.
+static LVGL_IN_USE: AtomicBool = AtomicBool::new(false);
+
+// TODO: Make this an external configuration
+const REFRESH_BUFFER_LEN: usize = 2;
+// Declare a buffer for the refresh rate
+pub(crate) const BUF_SIZE: usize = lvgl_sys::LV_HOR_RES_MAX as usize * REFRESH_BUFFER_LEN;
+
+pub struct UI<T, C>
+where
+    T: DrawTarget<Color = C>,
+    C: PixelColor + From<Color>,
+{
+    // LVGL is not thread-safe by default.
+    _not_sync: PhantomData<*mut ()>,
+    // Later we can add possibility to have multiple displays by using `heapless::Vec`
+    display_data: Option<DisplayUserData<T, C>>,
+}
+
+// LVGL does not use thread locals.
+unsafe impl<T, C> Send for UI<T, C>
+where
+    T: DrawTarget<Color = C>,
+    C: PixelColor + From<Color>,
+{
+}
+
+impl<T, C> UI<T, C>
+where
+    T: DrawTarget<Color = C>,
+    C: PixelColor + From<Color>,
+{
+    pub fn init() -> LvResult<Self> {
+        if LVGL_IN_USE
+            .compare_exchange(false, true, Ordering::Relaxed, Ordering::Relaxed)
+            .is_ok()
+        {
+            crate::lvgl_init();
+            Ok(Self {
+                _not_sync: PhantomData,
+                display_data: None,
+            })
+        } else {
+            Err(LvError::AlreadyInUse)
+        }
+    }
+
+    pub fn disp_drv_register(&mut self, display: T) -> LvResult<()> {
+        self.display_data = Some(DisplayUserData {
+            display,
+            phantom: PhantomData,
+        });
+
+        let refresh_buffer1 = [Color::from_rgb((0, 0, 0)).raw; BUF_SIZE];
+        let refresh_buffer2 = [Color::from_rgb((0, 0, 0)).raw; BUF_SIZE];
+
+        let mut disp_buf = MaybeUninit::<lvgl_sys::lv_disp_buf_t>::uninit();
+        let mut disp_drv = MaybeUninit::<lvgl_sys::lv_disp_drv_t>::uninit();
+
+        unsafe {
+            // Initialize the display buffer
+            lvgl_sys::lv_disp_buf_init(
+                disp_buf.as_mut_ptr(),
+                Box::into_raw(Box::new(refresh_buffer1)) as *mut cty::c_void,
+                Box::into_raw(Box::new(refresh_buffer2)) as *mut cty::c_void,
+                lvgl_sys::LV_HOR_RES_MAX * REFRESH_BUFFER_LEN as u32,
+            );
+            // Basic initialization of the display driver
+            lvgl_sys::lv_disp_drv_init(disp_drv.as_mut_ptr());
+            let mut disp_drv = Box::new(disp_drv.assume_init());
+            // Assign the buffer to the display
+            disp_drv.buffer = Box::into_raw(Box::new(disp_buf.assume_init()));
+            // Set your driver function
+            disp_drv.flush_cb = Some(display_callback_wrapper::<T, C>);
+            disp_drv.user_data = &mut self.display_data as *mut _ as *mut cty::c_void;
+            // We need to remember to deallocate the `disp_drv` memory when dropping UI
+            lvgl_sys::lv_disp_drv_register(Box::into_raw(disp_drv));
+        };
+
+        Ok(())
+    }
+
+    pub fn get_display_ref(&self) -> Option<&T> {
+        match self.display_data.as_ref() {
+            None => None,
+            Some(v) => Some(&v.display),
+        }
+    }
+
+    pub fn scr_act(&self) -> LvResult<Obj> {
+        unsafe {
+            let screen = lvgl_sys::lv_disp_get_scr_act(ptr::null_mut());
+            if let Some(v) = NonNull::new(screen) {
+                Ok(Obj::from_raw(v))
+            } else {
+                Err(LvError::InvalidReference)
+            }
+        }
+    }
+
+    pub fn event_send<W>(&mut self, obj: &mut W, event: Event<W::SpecialEvent>) -> LvResult<()>
+    where
+        W: Widget,
+    {
+        unsafe {
+            lvgl_sys::lv_event_send(obj.raw()?.as_mut(), event.into(), ptr::null_mut());
+        }
+        Ok(())
+    }
+
+    pub fn tick_inc(&mut self, tick_period: Duration) {
+        unsafe {
+            lvgl_sys::lv_tick_inc(tick_period.as_millis() as u32);
+        }
+    }
+
+    pub fn task_handler(&mut self) {
+        unsafe {
+            lvgl_sys::lv_task_handler();
+        }
+    }
+}
+
+pub(crate) struct DisplayUserData<T, C>
+where
+    T: DrawTarget<Color = C>,
+    C: PixelColor + From<Color>,
+{
+    display: T,
+    phantom: PhantomData<C>,
+}
+
+unsafe extern "C" fn display_callback_wrapper<T, C>(
+    disp_drv: *mut lvgl_sys::lv_disp_drv_t,
+    area: *const lvgl_sys::lv_area_t,
+    color_p: *mut lvgl_sys::lv_color_t,
+) where
+    T: DrawTarget<Color = C>,
+    C: PixelColor + From<Color>,
+{
+    // In the `std` world we would make sure to capture panics here and make them not escape across
+    // the FFI boundary. Since this library is focused on embedded platforms, we don't
+    // have an standard unwinding mechanism to rely upon.
+    let display_driver = *disp_drv;
+    // Rust code closure reference
+    if !display_driver.user_data.is_null() {
+        let user_data = &mut *(display_driver.user_data as *mut DisplayUserData<T, C>);
+        let x1 = (*area).x1;
+        let x2 = (*area).x2;
+        let y1 = (*area).y1;
+        let y2 = (*area).y2;
+        // TODO: Can we do anything when there is a error while flushing?
+        let _ = display_flush(&mut user_data.display, (x1, x2), (y1, y2), color_p);
+    }
+    // Indicate to LVGL that we are ready with the flushing
+    lvgl_sys::lv_disp_flush_ready(disp_drv);
+}
+
+// We separate this display flush function to reduce the amount of unsafe code we need to write.
+// This also provides a good separation of concerns, what is necessary from LVGL to work and
+// what is the lvgl-rs wrapper responsibility.
+fn display_flush<T, C>(
+    display: &mut T,
+    (x1, x2): (i16, i16),
+    (y1, y2): (i16, i16),
+    color_p: *mut lvgl_sys::lv_color_t,
+) -> Result<(), T::Error>
+where
+    T: DrawTarget<Color = C>,
+    C: PixelColor + From<Color>,
+{
+    let ys = y1..=y2;
+    let xs = (x1..=x2).enumerate();
+    let x_len = (x2 - x1 + 1) as usize;
+
+    // We use iterators here to ensure that the Rust compiler can apply all possible
+    // optimizations at compile time.
+    let pixels = ys.enumerate().flat_map(|(iy, y)| {
+        xs.clone().map(move |(ix, x)| {
+            let color_len = x_len * iy + ix;
+            let lv_color = unsafe { *color_p.add(color_len) };
+            let raw_color = Color::from_raw(lv_color);
+            Pixel(Point::new(x as i32, y as i32), raw_color.into())
+        })
+    });
+
+    display.draw_iter(pixels)
+}

lvgl/src/widgets/mod.rs

@@ -5,7 +5,7 @@ mod label;
 
 include!(concat!(env!("OUT_DIR"), "/generated.rs"));
 
-use crate::{NativeObject, Widget};
+use crate::NativeObject;
 pub use arc::*;
 pub use bar::*;
 pub use gauge::*;