Merge pull request #3512 from EnmanuelParache/stm32_usart_set_baudrate

stm32/usart: Changing baud rate

examples/stm32l1/src/bin/usart.rs

@@ -0,0 +1,37 @@
+#![no_std]
+#![no_main]
+
+use cortex_m_rt::entry;
+use defmt::*;
+use embassy_stm32::usart::{Config, Uart};
+use embassy_stm32::{bind_interrupts, peripherals, usart};
+use {defmt_rtt as _, panic_probe as _};
+
+bind_interrupts!(struct Irqs {
+    USART2 => usart::InterruptHandler<peripherals::USART2>;
+});
+
+#[entry]
+fn main() -> ! {
+    info!("Hello World!");
+
+    let p = embassy_stm32::init(Default::default());
+
+    let config = Config::default();
+    let mut usart = Uart::new_blocking(p.USART2, p.PA3, p.PA2, config).unwrap();
+    let desired_baudrate = 9600; // Default is 115200 and 9600 is used as example
+
+    match usart.set_baudrate(desired_baudrate) {
+        Ok(_) => info!("Baud rate set to {}", desired_baudrate),
+        Err(err) => error!("Error setting baudrate to {}: {}", desired_baudrate, err),
+    }
+
+    unwrap!(usart.blocking_write(b"Hello Embassy World!\r\n"));
+    info!("wrote Hello, starting echo");
+
+    let mut buf = [0u8; 1];
+    loop {
+        unwrap!(usart.blocking_read(&mut buf));
+        unwrap!(usart.blocking_write(&buf));
+    }
+}