working blocking uart

usart_blocking/src/bin/main.rs

@@ -0,0 +1,28 @@
+// src/bin/main.rs
+#![no_std]
+#![no_main]
+
+use defmt::*;
+use embassy_stm32::usart::{Config, Uart};
+use embassy_time::{Duration, Timer};
+use {defmt_rtt as _, panic_probe as _};
+
+#[cortex_m_rt::entry]
+fn main() -> ! {
+    info!("tititititi");
+
+    let p = embassy_stm32::init(Default::default());
+
+    let config = Config::default();
+    let mut usart = Uart::new_blocking(p.USART1, p.PA10, p.PA9, config).unwrap();
+
+    info!("starting echo");
+
+    let mut buf = [0u8; 1];
+    loop {
+        unwrap!(usart.blocking_read(&mut buf));
+        unwrap!(usart.blocking_write(&buf));
+        unwrap!(usart.blocking_write(b"a\r\n"));
+        Timer::after(Duration::from_secs(2));
+    }
+}

usart_blocking/src/lib.rs

@@ -0,0 +1 @@
+#![no_std]