57 lines
2.1 KiB
Markdown
57 lines
2.1 KiB
Markdown
<h1 align="center"> LittlevGL - Open-source Embedded GUI Library in Rust</h1>
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<p align="center">
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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.
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</p>
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<p align="center">
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LittlevGL is compatible with <samp>#![no_std]</samp> environments by default.
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</p>
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<h4 align="center">
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<a href="https://lvgl.io/">Official LittlevGL Website </a> ·
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<a href="https://github.com/littlevgl/lvgl">C library repository</a> ·
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<a href="https://lvgl.io/demos">Live demo</a>
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</h4>
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---
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## Usage
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Edit your `Cargo.toml` file dependencies with:
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```
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$ cargo add lvgl
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```
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The build requires the environment variable bellow to be set:
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- `DEP_LV_CONFIG_PATH`: Path to the directory containing the `lv_conf.h` header file used for configuration of LittlevGL library.
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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:
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```shell script
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$ DEP_LV_CONFIG_PATH=`pwd` cargo build
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```
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### Building for embedded environments
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We make use of `bindgen` for generating the bindings to LittlevGL at build time. There is a problem in cargo when building
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for `no_std`, so we need to use a workaround to build "lvgl-rs". The mainstrem issue in cargo is being tracked at
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[rust-lang/cargo#7915](https://github.com/rust-lang/cargo/issues/7915).
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```shell
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$ DEP_LV_CONFIG_PATH=`pwd` cargo build -Zfeatures=build_dep
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```
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#### Requirements / Limitations
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LittlevGL C libary do allocate memory dynamically and we need to allocate memory on the heap in the Rust side as well
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([`Box`](https://doc.rust-lang.org/beta/alloc/boxed/struct.Box.html)).
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That is required, so we can safely provide Rust pointers through FFI. For that reason, we do require
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[`alloc`](https://doc.rust-lang.org/alloc/) module to be available.
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## Running the demo
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[This project contains an example that can run in a desktop simulator.](./examples/demo)
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