eeb2d1db6f
* Ensure that uart is configured to account for clock changes, not just boot defaults * fix examples * changelog --------- Co-authored-by: Jesse Braham <jessebraham@users.noreply.github.com>
99 lines
2.7 KiB
Rust
99 lines
2.7 KiB
Rust
//! embassy serial
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//!
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//! This is an example of running the embassy executor and asynchronously
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//! writing to and reading from uart
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#![no_std]
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#![no_main]
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#![feature(type_alias_impl_trait)]
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use esp32s2_hal::{
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clock::ClockControl,
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embassy::{self, executor::Executor},
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interrupt,
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peripherals::{Interrupt, Peripherals, UART0},
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prelude::*,
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Uart,
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};
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use esp_backtrace as _;
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use esp_hal_common::uart::{config::AtCmdConfig, UartRx, UartTx};
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use heapless::Vec;
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use static_cell::make_static;
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// rx_fifo_full_threshold
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const READ_BUF_SIZE: usize = 64;
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// EOT (CTRL-D)
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const AT_CMD: u8 = 0x04;
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#[embassy_executor::task]
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async fn writer(mut tx: UartTx<'static, UART0>) {
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esp_println::println!("writing...");
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embedded_io_async::Write::write(
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&mut tx,
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b"Hello async serial. Enter something ended with EOT (CTRL-D).\r\n",
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)
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.await
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.unwrap();
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embedded_io_async::Write::flush(&mut tx).await.unwrap();
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}
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#[embassy_executor::task]
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async fn reader(mut rx: UartRx<'static, UART0>) {
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esp_println::println!("reading...");
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// max message size to receive
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// leave some extra space for AT-CMD characters
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const MAX_BUFFER_SIZE: usize = 10 * READ_BUF_SIZE + 16;
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let mut rbuf: Vec<u8, MAX_BUFFER_SIZE> = Vec::new();
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let mut offset = 0;
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while let Ok(len) = embedded_io_async::Read::read(&mut rx, &mut rbuf[offset..]).await {
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offset += len;
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if offset == 0 {
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rbuf.truncate(0);
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break;
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}
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// if set_at_cmd is used than stop reading
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if len < READ_BUF_SIZE {
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rbuf.truncate(offset);
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break;
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}
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}
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}
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#[entry]
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fn main() -> ! {
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esp_println::println!("Init!");
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let peripherals = Peripherals::take();
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let mut system = peripherals.SYSTEM.split();
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let clocks = ClockControl::boot_defaults(system.clock_control).freeze();
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#[cfg(feature = "embassy-time-timg0")]
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{
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let timer_group0 = esp32s2_hal::timer::TimerGroup::new(
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peripherals.TIMG0,
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&clocks,
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&mut system.peripheral_clock_control,
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);
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embassy::init(&clocks, timer_group0.timer0);
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}
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let mut uart0 = Uart::new(
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peripherals.UART0,
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&clocks,
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&mut system.peripheral_clock_control,
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);
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uart0.set_at_cmd(AtCmdConfig::new(None, None, None, AT_CMD, None));
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uart0
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.set_rx_fifo_full_threshold(READ_BUF_SIZE as u16)
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.unwrap();
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let (tx, rx) = uart0.split();
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interrupt::enable(Interrupt::UART0, interrupt::Priority::Priority1).unwrap();
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let executor = make_static!(Executor::new());
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executor.run(|spawner| {
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spawner.spawn(reader(rx)).ok();
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spawner.spawn(writer(tx)).ok();
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});
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}
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