86 lines
2.2 KiB
Rust
86 lines
2.2 KiB
Rust
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use embedded_hal::digital::v2::OutputPin;
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use nrf52832_hal::gpio::{Output, Pin, PushPull};
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/// Control the backlight.
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///
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/// There are three active-low backlight pins, each connected to a FET that
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/// toggles backlight power through a resistor.
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///
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/// - Low: 2.2 kΩ
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/// - Mid: 100 Ω
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/// - High: 30 Ω
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///
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/// Through combinations of these pins, 7 brightness levels (+ off) can be
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/// configured.
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pub struct Backlight {
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low: Pin<Output<PushPull>>,
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mid: Pin<Output<PushPull>>,
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high: Pin<Output<PushPull>>,
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/// The current brightness level (value between 0 and 7).
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brightness: u8,
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}
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impl Backlight {
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/// Initialize the backlight with the specified level (0–7).
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pub fn init(
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low: Pin<Output<PushPull>>,
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mid: Pin<Output<PushPull>>,
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high: Pin<Output<PushPull>>,
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brightness: u8,
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) -> Self {
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let mut backlight = Self {
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low,
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mid,
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high,
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brightness,
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};
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backlight.set(brightness);
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backlight
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}
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/// Set the brightness level. Must be a value between 0 (off) and 7 (max
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/// brightness). Higher values are clamped to 7.
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pub fn set(&mut self, mut brightness: u8) {
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if brightness > 7 {
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brightness = 7;
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}
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if brightness & 0x01 > 0 {
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self.low.set_low().unwrap();
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} else {
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self.low.set_high().unwrap();
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}
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if brightness & 0x02 > 0 {
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self.mid.set_low().unwrap();
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} else {
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self.mid.set_high().unwrap();
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}
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if brightness & 0x04 > 0 {
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self.high.set_low().unwrap();
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} else {
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self.high.set_high().unwrap();
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}
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self.brightness = brightness;
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}
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/// Turn off the backlight.
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pub fn off(&mut self) {
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self.set(0);
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}
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/// Increase backlight brightness.
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pub fn brighter(&mut self) {
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self.set(self.brightness + 1);
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}
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/// Decrease backlight brightness.
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pub fn darker(&mut self) {
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self.set(self.brightness - 1);
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}
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/// Return the current brightness level (value between 0 and 7).
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pub fn get_brightness(&self) -> u8 {
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self.brightness
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}
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}
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