diff --git a/usart_async/src/bin/main.rs b/usart_async/src/bin/main.rs
index 7150307..db6a6fb 100644
--- a/usart_async/src/bin/main.rs
+++ b/usart_async/src/bin/main.rs
@@ -3,26 +3,48 @@
 #![no_main]
 
 use defmt::*;
-use embassy_stm32::usart::{Config, Uart};
+use embassy_executor::Spawner;
 use embassy_time::{Duration, Timer};
+use embassy_stm32::usart::{Config, Uart};
+use embassy_stm32::bind_interrupts;
+use embassy_stm32::mode::Async;
 use {defmt_rtt as _, panic_probe as _};
 
-#[cortex_m_rt::entry]
-fn main() -> ! {
-    info!("tititititi");
+bind_interrupts!(
+    struct Irqs {
+        USART1 => embassy_stm32::usart::InterruptHandler<embassy_stm32::peripherals::USART1>;
+    }
+);
 
+#[embassy_executor::task]
+async fn receive_uart(mut uart: Uart<'static, Async>) {
+    let mut buf = [0u8; 1];
+    loop {
+        unwrap!(uart.read(&mut buf).await);
+        unwrap!(uart.write(&buf).await);
+        unwrap!(uart.write(b"a\r\n").await);
+        info!("uart received {}", buf[0]);
+        Timer::after(Duration::from_secs(1)).await;
+    }
+}
+
+#[embassy_executor::main]
+async fn main(spawner: Spawner) {
+    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();
+    let usart = Uart::new(p.USART1, p.PA10, p.PA9, Irqs, p.GPDMA1_CH1, p.GPDMA1_CH0, config).unwrap();
 
     info!("starting echo");
+    spawner.spawn(receive_uart(usart)).unwrap();
 
-    let mut buf = [0u8; 1];
+    let mut counter: u8 = 230;
     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));
+        counter = counter.wrapping_add(1);
+        info!("CPU doing other work: {}", counter);
+        Timer::after(Duration::from_millis(300)).await;
+
     }
+
 }