input via exti

2sem_sem2/Cargo.toml

@@ -12,7 +12,7 @@ panic-halt = "1.0.0"
 
 embassy-executor = { version = "0.9.1", features = ["arch-cortex-m", "executor-thread"] }
 embassy-futures = "0.1.2"
-embassy-stm32 = { version = "0.4.0", features = ["unstable-pac", "stm32u575zi", "time-driver-any", "memory-x", "defmt"] }
+embassy-stm32 = { version = "0.4.0", features = ["unstable-pac", "stm32u575zi", "time-driver-any", "memory-x", "defmt", "exti"] }
 embassy-sync = "0.7.2"
 embassy-time = { version = "0.5.0", features = ["tick-hz-32_768"] }
 embassy-usb = "0.5.1"

2sem_sem2/src/bin/main.rs

@@ -5,10 +5,9 @@
 use core::sync::atomic::{AtomicBool, Ordering};
 use defmt::info;
 use embassy_executor::Spawner;
-use embassy_stm32::exti;
+use embassy_stm32::exti::ExtiInput;
 use embassy_stm32::gpio;
-use embassy_stm32::gpio::{Input, Output, Pull};
-use embassy_stm32::usart::{Config, InterruptHandler, Uart, UartRx, UartTx};
+use embassy_stm32::gpio::{Output, Pull};
 use embassy_sync::blocking_mutex::raw::CriticalSectionRawMutex;
 use embassy_sync::channel::Channel;
 use embassy_sync::channel::Sender;
@@ -18,6 +17,7 @@ use heapless::Vec;
 use {defmt_rtt as _, panic_probe as _};
 
 static PIPE: Channel<CriticalSectionRawMutex, u8, 64> = Channel::new();
+static PIPE_REC: Channel<CriticalSectionRawMutex, u8, 64> = Channel::new();
 static SEND_ALLOWED: AtomicBool = AtomicBool::new(true);
 // static REC_ALLOWED: AtomicBool = AtomicBool::new(true);
 
@@ -26,17 +26,19 @@ async fn main(spawner: Spawner) {
     info!("tititititi");
 
     let p = embassy_stm32::init(Default::default());
-    let mut tx = Output::new(p.PF2, gpio::Level::High, gpio::Speed::VeryHigh);
-    let rx = Input::new(p.PA3, Pull::Up);
+    let tx = Output::new(p.PF2, gpio::Level::High, gpio::Speed::VeryHigh);
+    let rx = ExtiInput::new(p.PA3, p.EXTI3, Pull::Up);
 
-    let config = Config::default();
+    // let config = Config::default();
     let sender = PIPE.sender();
+    let receiver_sender = PIPE_REC.sender();
     // let receiver = PIPE.receiver();
 
     spawner.spawn(bit_send(tx)).unwrap();
+    spawner.spawn(bit_receive(rx, receiver_sender)).unwrap();
 
     info!("starting echo");
-    let mut v: Vec<u8, 38, u8> = Vec::new();
+    let v: Vec<u8, 38, u8> = Vec::new();
 
     loop {
         let slovko = "ahoj";
@@ -108,10 +110,38 @@ async fn bit_send(mut pin: Output<'static>) {
 }
 
 #[embassy_executor::task]
-async fn bit_receive(mut pin: Input<'static>) {
-    let mut ticker = Ticker::every(Duration::from_millis(10));
+async fn bit_receive(
+    mut pin: ExtiInput<'static>,
+    sender: Sender<'static, CriticalSectionRawMutex, u8, 64>,
+) {
+    let mut last_tick = embassy_time::Instant::now();
+    let mut measured_bit_time = 0;
+
     loop {
-        // bitrate
-        ticker.next().await;
+        pin.wait_for_any_edge().await;
+
+        let now = embassy_time::Instant::now();
+        let diff = now.duration_since(last_tick).as_ticks();
+        last_tick = now;
+
+        if diff == 0 {
+            continue;
+        }
+
+        if measured_bit_time == 0 {
+            measured_bit_time = diff;
+            let bit_val = if pin.is_high() { 0 } else { 1 };
+            sender.send(bit_val).await;
+            continue;
+        }
+
+        let count = (diff + (measured_bit_time / 2)) / measured_bit_time;
+
+        let bit_val = if pin.is_high() { 0 } else { 1 };
+
+        for _ in 0..count {
+            info!("{}", bit_val);
+            sender.send(bit_val).await;
+        }
     }
 }