tests/rp: test error conditions for uart
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pennae
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19588a9e6f
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1 changed files with 148 additions and 11 deletions
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@ -4,28 +4,165 @@
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use defmt::{assert_eq, *};
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use embassy_executor::Spawner;
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use embassy_rp::uart::{Config, Uart};
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use embassy_rp::gpio::{Level, Output};
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use embassy_rp::uart::{Blocking, Config, Error, Instance, Parity, Uart, UartRx};
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use embassy_time::{Duration, Timer};
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use {defmt_rtt as _, panic_probe as _};
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fn read<const N: usize>(uart: &mut Uart<'_, impl Instance, Blocking>) -> Result<[u8; N], Error> {
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let mut buf = [255; N];
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uart.blocking_read(&mut buf)?;
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Ok(buf)
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}
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fn read1<const N: usize>(uart: &mut UartRx<'_, impl Instance, Blocking>) -> Result<[u8; N], Error> {
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let mut buf = [255; N];
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uart.blocking_read(&mut buf)?;
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Ok(buf)
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}
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async fn send(pin: &mut Output<'_, impl embassy_rp::gpio::Pin>, v: u8, parity: Option<bool>) {
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pin.set_low();
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Timer::after(Duration::from_millis(1)).await;
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for i in 0..8 {
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if v & (1 << i) == 0 {
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pin.set_low();
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} else {
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pin.set_high();
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}
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Timer::after(Duration::from_millis(1)).await;
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}
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if let Some(b) = parity {
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if b {
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pin.set_high();
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} else {
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pin.set_low();
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}
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Timer::after(Duration::from_millis(1)).await;
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}
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pin.set_high();
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Timer::after(Duration::from_millis(1)).await;
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}
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#[embassy_executor::main]
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async fn main(_spawner: Spawner) {
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let p = embassy_rp::init(Default::default());
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info!("Hello World!");
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let (tx, rx, uart) = (p.PIN_0, p.PIN_1, p.UART0);
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let (mut tx, mut rx, mut uart) = (p.PIN_0, p.PIN_1, p.UART0);
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{
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let config = Config::default();
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let mut uart = Uart::new_blocking(uart, tx, rx, config);
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let mut uart = Uart::new_blocking(&mut uart, &mut tx, &mut rx, config);
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// We can't send too many bytes, they have to fit in the FIFO.
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// This is because we aren't sending+receiving at the same time.
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let data = [0xC0, 0xDE];
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uart.blocking_write(&data).unwrap();
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assert_eq!(read(&mut uart).unwrap(), data);
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}
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let mut buf = [0; 2];
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uart.blocking_read(&mut buf).unwrap();
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assert_eq!(buf, data);
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info!("test overflow detection");
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{
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let config = Config::default();
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let mut uart = Uart::new_blocking(&mut uart, &mut tx, &mut rx, config);
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let data = [
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1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29,
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30, 31, 32,
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];
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let overflow = [
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101, 102, 103, 104, 105, 106, 107, 108, 109, 110, 111, 112, 113, 114, 115, 116,
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];
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uart.blocking_write(&data).unwrap();
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uart.blocking_write(&overflow).unwrap();
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while uart.busy() {}
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// prefix in fifo is valid
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assert_eq!(read(&mut uart).unwrap(), data);
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// next received character causes overrun error and is discarded
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uart.blocking_write(&[1, 2, 3]).unwrap();
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assert_eq!(read::<1>(&mut uart).unwrap_err(), Error::Overrun);
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assert_eq!(read(&mut uart).unwrap(), [2, 3]);
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}
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info!("test break detection");
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{
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let config = Config::default();
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let mut uart = Uart::new_blocking(&mut uart, &mut tx, &mut rx, config);
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// break on empty fifo
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uart.send_break(20).await;
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uart.blocking_write(&[64]).unwrap();
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assert_eq!(read::<1>(&mut uart).unwrap_err(), Error::Break);
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assert_eq!(read(&mut uart).unwrap(), [64]);
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// break on partially filled fifo
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uart.blocking_write(&[65; 2]).unwrap();
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uart.send_break(20).await;
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uart.blocking_write(&[66]).unwrap();
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assert_eq!(read(&mut uart).unwrap(), [65; 2]);
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assert_eq!(read::<1>(&mut uart).unwrap_err(), Error::Break);
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assert_eq!(read(&mut uart).unwrap(), [66]);
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}
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// parity detection. here we bitbang to not require two uarts.
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info!("test parity error detection");
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{
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let mut pin = Output::new(&mut tx, Level::High);
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let mut config = Config::default();
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config.baudrate = 1000;
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config.parity = Parity::ParityEven;
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let mut uart = UartRx::new_blocking(&mut uart, &mut rx, config);
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async fn chr(pin: &mut Output<'_, impl embassy_rp::gpio::Pin>, v: u8, parity: u8) {
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send(pin, v, Some(parity != 0)).await;
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}
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// first check that we can send correctly
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chr(&mut pin, 64, 1).await;
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assert_eq!(read1(&mut uart).unwrap(), [64]);
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// all good, check real errors
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chr(&mut pin, 2, 1).await;
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chr(&mut pin, 3, 0).await;
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chr(&mut pin, 4, 0).await;
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chr(&mut pin, 5, 0).await;
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assert_eq!(read1(&mut uart).unwrap(), [2, 3]);
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assert_eq!(read1::<1>(&mut uart).unwrap_err(), Error::Parity);
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assert_eq!(read1(&mut uart).unwrap(), [5]);
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}
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// framing error detection. here we bitbang because there's no other way.
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info!("test framing error detection");
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{
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let mut pin = Output::new(&mut tx, Level::High);
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let mut config = Config::default();
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config.baudrate = 1000;
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let mut uart = UartRx::new_blocking(&mut uart, &mut rx, config);
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async fn chr(pin: &mut Output<'_, impl embassy_rp::gpio::Pin>, v: u8, good: bool) {
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if good {
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send(pin, v, None).await;
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} else {
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send(pin, v, Some(false)).await;
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}
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}
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// first check that we can send correctly
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chr(&mut pin, 64, true).await;
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assert_eq!(read1(&mut uart).unwrap(), [64]);
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// all good, check real errors
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chr(&mut pin, 2, true).await;
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chr(&mut pin, 3, true).await;
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chr(&mut pin, 4, false).await;
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chr(&mut pin, 5, true).await;
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assert_eq!(read1(&mut uart).unwrap(), [2, 3]);
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assert_eq!(read1::<1>(&mut uart).unwrap_err(), Error::Framing);
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assert_eq!(read1(&mut uart).unwrap(), [5]);
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}
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info!("Test OK");
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cortex_m::asm::bkpt();
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