Async UART TX support

examples/embassy/Cargo.toml

@@ -9,6 +9,7 @@ cortex-m = { version = "0.7", features = ["critical-section-single-core"] }
 cortex-m-rt = "0.7"
 embedded-hal = "1"
 embedded-hal-async = "1"
+embedded-io-async = "0.6"
 
 rtt-target = "0.6"
 panic-rtt-target = "0.2"

examples/embassy/src/bin/async-gpio.rs

@@ -14,7 +14,7 @@ use embedded_hal_async::digital::Wait;
 use panic_rtt_target as _;
 use rtt_target::{rprintln, rtt_init_print};
 use va108xx_embassy::embassy;
-use va108xx_hal::gpio::{handle_interrupt_for_async_gpio, InputDynPinAsync, InputPinAsync, PinsB};
+use va108xx_hal::gpio::{on_interrupt_for_asynch_gpio, InputDynPinAsync, InputPinAsync, PinsB};
 use va108xx_hal::{
     gpio::{DynPin, PinsA},
     pac::{self, interrupt},
@@ -248,11 +248,11 @@ async fn output_task(
 #[interrupt]
 #[allow(non_snake_case)]
 fn OC10() {
-    handle_interrupt_for_async_gpio();
+    on_interrupt_for_asynch_gpio();
 }
 
 #[interrupt]
 #[allow(non_snake_case)]
 fn OC11() {
-    handle_interrupt_for_async_gpio();
+    on_interrupt_for_asynch_gpio();
 }

examples/embassy/src/bin/async-uart.rs

@@ -0,0 +1,87 @@
+#![no_std]
+#![no_main]
+use embassy_executor::Spawner;
+use embassy_time::{Duration, Instant, Ticker};
+use embedded_hal::digital::StatefulOutputPin;
+use embedded_io_async::Write;
+use panic_rtt_target as _;
+use rtt_target::{rprintln, rtt_init_print};
+use va108xx_embassy::embassy;
+use va108xx_hal::{
+    gpio::PinsA,
+    pac::{self, interrupt},
+    prelude::*,
+    uart::{self, on_interrupt_uart_a_tx, TxAsync},
+    InterruptConfig,
+};
+
+const SYSCLK_FREQ: Hertz = Hertz::from_raw(50_000_000);
+
+const STR_LIST: &[&str] = &[
+    "Hello World\r\n",
+    "Smoll\r\n",
+    "A string which is larger than the FIFO size\r\n",
+    "A really large string which is significantly larger than the FIFO size\r\n",
+];
+
+// main is itself an async function.
+#[embassy_executor::main]
+async fn main(_spawner: Spawner) {
+    rtt_init_print!();
+    rprintln!("-- VA108xx Embassy Demo --");
+
+    let mut dp = pac::Peripherals::take().unwrap();
+
+    // Safety: Only called once here.
+    unsafe {
+        embassy::init(
+            &mut dp.sysconfig,
+            &dp.irqsel,
+            SYSCLK_FREQ,
+            dp.tim23,
+            dp.tim22,
+        );
+    }
+
+    let porta = PinsA::new(&mut dp.sysconfig, dp.porta);
+    let mut led0 = porta.pa10.into_readable_push_pull_output();
+    let mut led1 = porta.pa7.into_readable_push_pull_output();
+    let mut led2 = porta.pa6.into_readable_push_pull_output();
+
+    let tx = porta.pa9.into_funsel_2();
+    let rx = porta.pa8.into_funsel_2();
+
+    let uarta = uart::Uart::new_with_interrupt(
+        &mut dp.sysconfig,
+        50.MHz(),
+        dp.uarta,
+        (tx, rx),
+        115200.Hz(),
+        InterruptConfig::new(pac::Interrupt::OC2, true, true),
+    );
+    let (tx, _rx) = uarta.split();
+    let mut async_tx = TxAsync::new(tx);
+    let mut ticker = Ticker::every(Duration::from_secs(1));
+    let mut idx = 0;
+    loop {
+        rprintln!("Current time: {}", Instant::now().as_secs());
+        led0.toggle().ok();
+        led1.toggle().ok();
+        led2.toggle().ok();
+        let _written = async_tx
+            .write(STR_LIST[idx].as_bytes())
+            .await
+            .expect("writing failed");
+        idx += 1;
+        if idx == STR_LIST.len() {
+            idx = 0;
+        }
+        ticker.next().await;
+    }
+}
+
+#[interrupt]
+#[allow(non_snake_case)]
+fn OC2() {
+    on_interrupt_uart_a_tx();
+}