Alternate LED state to demonstrate HW bringup

Cargo.lock

@@ -1092,6 +1092,7 @@ dependencies = [
  "esp-rtos",
  "rtt-target",
  "static_cell",
+ "ws2812-rs",
 ]
 
 [[package]]
@@ -1570,6 +1571,16 @@ dependencies = [
  "memchr",
 ]
 
+[[package]]
+name = "ws2812-rs"
+version = "0.3.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "a31238e916943f43bc2cc4572e121688091483c89b31eec5e861f54853d60a4d"
+dependencies = [
+ "embassy-time",
+ "embedded-hal 1.0.0",
+]
+
 [[package]]
 name = "xtensa-lx"
 version = "0.13.0"

Cargo.toml

@@ -28,6 +28,7 @@ rtt-target       = { version = "0.6.2", features = ["defmt"] }
 
 critical-section = "1.2.0"
 static_cell      = "2.1.1"
+ws2812-rs = "0.3.1"
 
 
 [profile.dev]

src/bin/main.rs

@@ -11,7 +11,10 @@ use defmt::info;
 use embassy_executor::Spawner;
 use embassy_time::{Duration, Timer};
 use esp_hal::clock::CpuClock;
+use esp_hal::spi::master::{Spi, Config as SpiConfig};
+use esp_hal::time::Rate;
 use esp_hal::timer::timg::TimerGroup;
+use ws2812_rs::{WS2812SPI, SendColorBySPI, Color};
 
 #[panic_handler]
 fn panic(_: &core::panic::PanicInfo) -> ! {
@@ -42,15 +45,22 @@ async fn main(spawner: Spawner) -> ! {
   let timg0 = TimerGroup::new(peripherals.TIMG0);
   esp_rtos::start(timg0.timer0);
 
-  info!("Embassy initialized!");
-
   // 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);
+
+  info!("Padmapper initialized!");
+
   loop {
-    info!("Hello world!");
+    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;
   }
-
-  // for inspiration have a look at the examples at https://github.com/esp-rs/esp-hal/tree/esp-hal-v1.0.0/examples
 }