start playing around with dcf77

Cargo.toml

@@ -14,3 +14,7 @@ embassy-stm32 = { git = "https://github.com/embassy-rs/embassy", features = ["de
 embassy-sync = { version = "0.3", features = ["nightly"] }
 embassy-time = { version = "0.1.3", features = ["defmt", "nightly"] }
 panic-probe = { version = "0.3", features = ["print-defmt"] }
+
+[profile.release]
+debug = true
+opt-level = "z"

src/main.rs

@@ -12,10 +12,10 @@ use embassy_executor::Spawner;
 use embassy_stm32::{
 	exti::ExtiInput,
 	gpio::{Input, Level, Output, Pull, Speed},
-	peripherals::{PA5, PC13}
+	peripherals::{PA0, PA1, PA5, PC13}
 };
 use embassy_sync::blocking_mutex::raw::ThreadModeRawMutex;
-use embassy_time::{Duration, Timer};
+use embassy_time::{Duration, Instant, Timer};
 use panic_probe as _;
 use static_mutex::StaticMutex;
 
@@ -24,6 +24,8 @@ type MutexGuard<'a, T> = embassy_sync::mutex::MutexGuard<'a, ThreadModeRawMutex,
 
 type NucleoLed = Output<'static, PA5>;
 type NucleoButton = ExtiInput<'static, PC13>;
+type POn = Output<'static, PA0>;
+type Tco = ExtiInput<'static, PA1>;
 
 static LED: StaticMutex<NucleoLed> = StaticMutex::new();
 static BLINKING: Mutex<bool> = Mutex::new(true);
@@ -54,10 +56,60 @@ async fn button_handler(mut button: NucleoButton) {
 	}
 }
 
+#[embassy_executor::task]
+async fn query_time(mut pon: POn, mut tco: Tco, interval: Duration) {
+	loop {
+		pon.set_low();
+		info!("Waiting");
+		tco.wait_for_falling_edge().await;
+		// for _ in 0 .. 10 {
+		// 	info!("Receiving");
+		// 	let mut bytes = 0u64;
+		// 	for _ in 0 .. 60 {
+		// 		bytes = (bytes << 1) | (tco.is_low() as u64);
+		// 		Timer::after(Duration::from_millis(100)).await;
+		// 	}
+		// 	info!("DCF77: {:X}", bytes);
+		// }
+		let start = Instant::now();
+		let mut next = start;
+		for _ in 0 .. 120 {
+			let mut bytes = 0u16;
+			for _ in 0 .. 10 {
+				bytes = (bytes << 1) | (tco.is_low() as u16);
+				next += Duration::from_millis(100);
+				Timer::at(next).await;
+			}
+			println!(
+				"{}{}{}{}{}{}{}{}{}{} ({})",
+				(bytes >> 9) & 1,
+				(bytes >> 8) & 1,
+				(bytes >> 7) & 1,
+				(bytes >> 6) & 1,
+				(bytes >> 5) & 1,
+				(bytes >> 4) & 1,
+				(bytes >> 3) & 1,
+				(bytes >> 2) & 1,
+				(bytes >> 1) & 1,
+				bytes & 1,
+				start.elapsed().as_millis()
+			);
+		}
+		pon.set_high();
+
+		Timer::after(interval).await;
+	}
+}
+
 #[embassy_executor::main]
 async fn main(spawner: Spawner) {
 	let p = embassy_stm32::init(Default::default());
 
+	let pon = Output::new(p.PA0, Level::High, Speed::Low);
+	let tco = ExtiInput::new(Input::new(p.PA1, Pull::None), p.EXTI1);
+
+	unwrap!(spawner.spawn(query_time(pon, tco, Duration::from_secs(300))));
+
 	LED.init(Output::new(p.PA5, Level::Low, Speed::Low)).await;
 	let button = ExtiInput::new(Input::new(p.PC13, Pull::Up), p.EXTI13);