Heartbeat LED blink in separate embassy task

src/bin/main.rs

@@ -9,7 +9,7 @@
 
 use defmt::info;
 use embassy_executor::Spawner;
-use embassy_time::{Duration, Timer};
+use embassy_time::Timer;
 use esp_hal::clock::CpuClock;
 use esp_hal::spi::master::{Spi, Config as SpiConfig};
 use esp_hal::time::Rate;
@@ -27,6 +27,8 @@ extern crate alloc;
 // For more information see: <https://docs.espressif.com/projects/esp-idf/en/stable/esp32/api-reference/system/app_image_format.html#application-description>
 esp_bootloader_esp_idf::esp_app_desc!();
 
+const LED_SPI_HZ: u32 = 3_200_000;
+
 #[allow(
   clippy::large_stack_frames,
   reason = "it's not unusual to allocate larger buffers etc. in main"
@@ -45,22 +47,34 @@ async fn main(spawner: Spawner) -> ! {
   let timg0 = TimerGroup::new(peripherals.TIMG0);
   esp_rtos::start(timg0.timer0);
 
-  // TODO: Spawn some tasks
-  let _ = spawner;
-
-  const LED_SPI_HZ: u32 = 3_200_000;
   let spi = Spi::new(peripherals.SPI2,
                      SpiConfig::default().with_frequency(Rate::from_hz(LED_SPI_HZ)))
     .unwrap()
     .with_mosi(peripherals.GPIO48);
-  let mut led = WS2812SPI::new(spi);
+  let led = WS2812SPI::new(spi);
+  spawner.spawn(heartbeat_task(led)).unwrap();
 
   info!("Padmapper initialized!");
 
+  // Idle forever
   loop {
-    led.color_send_by_spi(Color([0, 0, 8]), LED_SPI_HZ).unwrap();
-    Timer::after(Duration::from_secs(1)).await;
-    led.color_send_by_spi(Color([8, 0, 8]), LED_SPI_HZ).unwrap();
-    Timer::after(Duration::from_secs(1)).await;
+    Timer::after_secs(6 * 60 * 60).await;
+  }
+}
+
+#[embassy_executor::task]
+async fn heartbeat_task(mut led: WS2812SPI<Spi<'static, esp_hal::Blocking>>) {
+  let on_color = Color([8, 0, 0]);
+  let off_color = Color([0, 0, 0]);
+
+  loop {
+    led.color_send_by_spi(on_color, LED_SPI_HZ).unwrap();
+    Timer::after_millis(100).await;
+    led.color_send_by_spi(off_color, LED_SPI_HZ).unwrap();
+    Timer::after_millis(100).await;
+    led.color_send_by_spi(on_color, LED_SPI_HZ).unwrap();
+    Timer::after_millis(100).await;
+    led.color_send_by_spi(off_color, LED_SPI_HZ).unwrap();
+    Timer::after_millis(700).await;
   }
 }