From f3d3b8899358ce8540bf5b2107a71b02ff941213 Mon Sep 17 00:00:00 2001
From: Roi Bachynskyi <roybachynskyi@gmail.com>
Date: Mon, 15 Sep 2025 00:38:23 +0300
Subject: lpc55: dma and async usart

---
 examples/lpc55s69/src/bin/usart_async.rs | 70 ++++++++++++++++++++++++++++++++
 1 file changed, 70 insertions(+)
 create mode 100644 examples/lpc55s69/src/bin/usart_async.rs

(limited to 'examples/lpc55s69/src')

diff --git a/examples/lpc55s69/src/bin/usart_async.rs b/examples/lpc55s69/src/bin/usart_async.rs
new file mode 100644
index 000000000..b06abd477
--- /dev/null
+++ b/examples/lpc55s69/src/bin/usart_async.rs
@@ -0,0 +1,70 @@
+#![no_std]
+#![no_main]
+
+use core::str::from_utf8_mut;
+
+use defmt::*;
+use embassy_executor::Spawner;
+use embassy_nxp::bind_interrupts;
+use embassy_nxp::gpio::{Level, Output};
+use embassy_nxp::peripherals::USART2;
+use embassy_nxp::usart::{Config, InterruptHandler, Usart};
+use embassy_time::Timer;
+use {defmt_rtt as _, panic_halt as _};
+
+bind_interrupts!(struct Irqs {
+        FLEXCOMM2 => InterruptHandler<USART2>;
+    }
+);
+
+#[embassy_executor::task]
+async fn blinky_task(mut led: Output<'static>) {
+    loop {
+        info!("[TASK] led off!");
+        led.set_high();
+        Timer::after_millis(500).await;
+
+        info!("[TASK] led on!");
+        led.set_low();
+        Timer::after_millis(500).await;
+    }
+}
+
+#[embassy_executor::main]
+async fn main(spawner: Spawner) {
+    let p = embassy_nxp::init(Default::default());
+    let mut usart = Usart::new(
+        p.USART2,
+        p.PIO0_27,
+        p.PIO1_24,
+        Irqs,
+        p.DMA_CH11,
+        p.DMA_CH10,
+        Config::default(),
+    );
+    let led = Output::new(p.PIO1_6, Level::Low);
+    spawner.spawn(blinky_task(led).unwrap());
+    info!("[MAIN] Entering main loop");
+    loop {
+        let tx_buf = b"Hello, Ferris!";
+        let mut rx_buf = [0u8; 14];
+        info!("[MAIN] Write a message");
+        usart.write(tx_buf).await.unwrap();
+        Timer::after_millis(500).await;
+
+        info!("[MAIN] Read a message");
+        match usart.read(&mut rx_buf).await {
+            Ok(_) => match from_utf8_mut(&mut rx_buf) {
+                Ok(str) => {
+                    info!("[MAIN] The message is: {}", str);
+                }
+                Err(_) => {
+                    error!("[MAIN] Error in converting to UTF8");
+                }
+            },
+            Err(e) => warn!("[MAIN] Error: {}", e),
+        }
+
+        Timer::after_millis(500).await;
+    }
+}
-- 
cgit