working data catch

semestralka_1d_rx_bez_dma/src/bin/main.rs

@@ -37,7 +37,7 @@ use core::cell::RefCell;
 use embassy_sync::channel::Channel;
 
 static RX_PIN_GLOBAL: Mutex<RefCell<Option<&'static Input<'static>>>> = Mutex::new(RefCell::new(None));
-static PD6_BITS: Channel<CriticalSectionRawMutex, u8, 512> = Channel::new();
+static PD6_BITS: Channel<CriticalSectionRawMutex, u8, 4096> = Channel::new();
 
 bind_interrupts!(struct Irqs {
     USART1 => BufferedInterruptHandler<peripherals::USART1>;
@@ -120,10 +120,14 @@ async fn main(spawner: Spawner) {
     // EDN OF SOFTWARE UART
 
     unsafe { cortex_m::peripheral::NVIC::unmask(pac::Interrupt::TIM7); }
+    let mut last_bit: Option<u8> = None;
     loop {
-        if let Ok(bit) = PD6_BITS.try_receive() {
-            // only called when ISR pushed something
+        while let Ok(bit) = PD6_BITS.try_receive() {
+            if Some(bit) != last_bit {
+                // PD6 level changed since the last sample → print one 'c'
                 info!("c");
+                last_bit = Some(bit);
+            }
         }
         yield_now().await;
     }
@@ -133,11 +137,9 @@ async fn main(spawner: Spawner) {
 fn TIM7() {
     let tim = unsafe { pac::TIM7 };
 
-    // acknowledge update
     if tim.sr().read().uif() {
         tim.sr().modify(|w| w.set_uif(false));
 
-        // quick PD6 read
         let bit = cortex_m::interrupt::free(|cs| {
             RX_PIN_GLOBAL
                 .borrow(cs)
@@ -145,14 +147,9 @@ fn TIM7() {
                 .as_ref()
                 .map(|pin| pin.is_high())
                 .unwrap_or(false)
-        });
+        }) as u8;
 
-        // track state change; push if different
-        static mut LAST: bool = false;
-        if bit != unsafe { LAST } {
-            unsafe { LAST = bit; }
-            let _ = PD6_BITS.try_send(bit as u8);
-        }
+        let _ = PD6_BITS.try_send(bit);
     }
 }