add rgb check and example

examples/embassy-rgb-check/src/main.rs

@@ -0,0 +1,70 @@
+#![deny(unsafe_code)]
+#![no_std]
+#![no_main]
+
+use cortex_m as _;
+use defmt::info;
+use defmt_rtt as _;
+use embassy_executor::Spawner;
+use embassy_stm32::gpio::{Level, Output, Speed};
+use embassy_time::Timer;
+use panic_probe as _;
+
+const HOLD_MS: u64 = 1000;
+
+// main: cycle each RGB pin high and low in order so the LED wiring can be checked.
+// Input: the Embassy spawner, which this example does not use.
+// Output: never returns.
+#[embassy_executor::main]
+async fn main(_spawner: Spawner) {
+    let p = embassy_stm32::init(Default::default());
+    let _gnd = Output::new(p.PA0, Level::Low, Speed::Low);
+    let mut red = Output::new(p.PA1, Level::Low, Speed::Low);
+    let mut green = Output::new(p.PA2, Level::Low, Speed::Low);
+    let mut blue = Output::new(p.PA3, Level::Low, Speed::Low);
+    let mut led = Output::new(p.PC13, Level::High, Speed::Low);
+
+    loop {
+        info!("expected: red high, green low, blue low");
+        red.set_high();
+        green.set_low();
+        blue.set_low();
+        led.set_low();
+        Timer::after_millis(HOLD_MS).await;
+
+        info!("expected: red low, green low, blue low");
+        red.set_low();
+        green.set_low();
+        blue.set_low();
+        led.set_high();
+        Timer::after_millis(HOLD_MS).await;
+
+        info!("expected: red low, green high, blue low");
+        red.set_low();
+        green.set_high();
+        blue.set_low();
+        led.set_low();
+        Timer::after_millis(HOLD_MS).await;
+
+        info!("expected: red low, green low, blue low");
+        red.set_low();
+        green.set_low();
+        blue.set_low();
+        led.set_high();
+        Timer::after_millis(HOLD_MS).await;
+
+        info!("expected: red low, green low, blue high");
+        red.set_low();
+        green.set_low();
+        blue.set_high();
+        led.set_low();
+        Timer::after_millis(HOLD_MS).await;
+
+        info!("expected: red low, green low, blue low");
+        red.set_low();
+        green.set_low();
+        blue.set_low();
+        led.set_high();
+        Timer::after_millis(HOLD_MS).await;
+    }
+}