working async buffered uart

usart_async/src/bin/main.rs

@@ -7,17 +7,21 @@ use embassy_executor::Spawner;
 use embassy_time::{Duration, Timer};
 use embassy_stm32::usart::{Config, Uart};
 use embassy_stm32::bind_interrupts;
+use embassy_stm32::usart::{BufferedUart, BufferedInterruptHandler};
 use embassy_stm32::mode::Async;
+use embedded_io_async::{Read, Write};
+use embassy_stm32::peripherals;
+use static_cell::StaticCell;
 use {defmt_rtt as _, panic_probe as _};
 
 bind_interrupts!(
     struct Irqs {
-        USART1 => embassy_stm32::usart::InterruptHandler<embassy_stm32::peripherals::USART1>;
+        USART1 => BufferedInterruptHandler<peripherals::USART1>;
     }
 );
 
 #[embassy_executor::task]
-async fn receive_uart(mut uart: Uart<'static, Async>) {
+async fn receive_uart(mut uart: BufferedUart<'static>) {
     let mut buf = [0u8; 1];
     loop {
         unwrap!(uart.read(&mut buf).await);
@@ -32,8 +36,24 @@ async fn main(spawner: Spawner) {
     info!("tititititi");
     let p = embassy_stm32::init(Default::default());
 
+    static TX_BUF: StaticCell<[u8; 256]> = StaticCell::new();
+    static RX_BUF: StaticCell<[u8; 256]> = StaticCell::new();
+    let tx_buf = TX_BUF.init([0; 256]);
+    let rx_buf = RX_BUF.init([0; 256]);
+
+    let mut cfg = Config::default();
+    cfg.baudrate = 230_400;
+
     let config = Config::default();
-    let usart = Uart::new(p.USART1, p.PA10, p.PA9, Irqs, p.GPDMA1_CH1, p.GPDMA1_CH0, config).unwrap();
+    let usart = BufferedUart::new(
+        p.USART1,
+        p.PA10, // RX
+        p.PA9,  // TX
+        tx_buf,
+        rx_buf,
+        Irqs,
+        cfg,
+    ).unwrap();
 
     info!("starting echo");
     spawner.spawn(receive_uart(usart)).unwrap();
@@ -43,7 +63,5 @@ async fn main(spawner: Spawner) {
         counter = counter.wrapping_add(1);
         info!("CPU doing other work: {}", counter);
         Timer::after(Duration::from_millis(300)).await;
-
     }
-
 }