led and backlight

src/main.rs

@@ -0,0 +1,69 @@
+#![no_std]
+#![no_main]
+
+mod backlight;
+mod led;
+
+use esp_backtrace as _;
+use esp_bootloader_esp_idf::esp_app_desc;
+use esp_hal::ledc::timer::{self, TimerIFace};
+use esp_hal::ledc::{LSGlobalClkSource, Ledc, LowSpeed};
+use esp_hal::{init, rmt::Rmt, time::Rate, Config};
+use esp_println::println;
+use smart_leds::hsv::{hsv2rgb, Hsv};
+use smart_leds::{brightness, gamma};
+
+esp_app_desc!();
+
+#[esp_hal::main]
+fn main() -> ! {
+    let peripherals = init(Config::default());
+
+    let mut led = {
+        let rmt = Rmt::new(peripherals.RMT, Rate::from_mhz(80)).expect("Failed to init RMT");
+        led::RgbLed::new(rmt.channel0, peripherals.GPIO8).expect("Failed to init RGB LED")
+    };
+
+    let mut ledc = Ledc::new(peripherals.LEDC);
+    ledc.set_global_slow_clock(LSGlobalClkSource::APBClk);
+    let mut timer = ledc.timer::<LowSpeed>(timer::Number::Timer0);
+    timer
+        .configure(timer::config::Config {
+            duty: timer::config::Duty::Duty8Bit,
+            clock_source: timer::LSClockSource::APBClk,
+            frequency: Rate::from_khz(5),
+        })
+        .expect("Failed to configure backlight timer");
+    let mut backlight =
+        backlight::LcdBacklight::new(&timer, peripherals.GPIO22).expect("Failed to init backlight");
+
+    let delay = esp_hal::delay::Delay::new();
+
+    let levels = [1.0f32, 0.75, 0.5, 0.25, 0.0, 0.5];
+    let mut level_idx = 0;
+
+    loop {
+        for hue in 0..=255 {
+            let rgb = hsv2rgb(Hsv {
+                hue,
+                sat: 255,
+                val: 255,
+            });
+            let lit = brightness(gamma(core::iter::once(rgb)), 40)
+                .next()
+                .unwrap();
+            led.set_rgb(lit).unwrap();
+
+            if hue % 32 == 0 {
+                println!("hue {hue}: ({}, {}, {})", lit.r, lit.g, lit.b);
+            }
+
+            delay.delay_millis(10);
+        }
+
+        let level = levels[level_idx % levels.len()];
+        backlight.set_level(level).unwrap();
+        println!("backlight level: {level}");
+        level_idx += 1;
+    }
+}