117 lines
4.2 KiB
Rust
117 lines
4.2 KiB
Rust
#![no_std]
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#![no_main]
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#![feature(type_alias_impl_trait)]
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#[path = "../example_common.rs"]
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mod example_common;
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use defmt::assert_eq;
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use embassy_executor::Spawner;
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use embassy_stm32::dma::NoDma;
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use embassy_stm32::interrupt;
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use embassy_stm32::usart::{Config, Error, Uart};
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use embassy_time::{Duration, Instant};
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use example_common::*;
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#[embassy_executor::main]
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async fn main(_spawner: Spawner) {
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let p = embassy_stm32::init(config());
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info!("Hello World!");
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// Arduino pins D0 and D1
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// They're connected together with a 1K resistor.
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#[cfg(feature = "stm32f103c8")]
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let (mut tx, mut rx, mut usart, mut irq) = (p.PA9, p.PA10, p.USART1, interrupt::take!(USART1));
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#[cfg(feature = "stm32g491re")]
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let (mut tx, mut rx, mut usart, mut irq) = (p.PC4, p.PC5, p.USART1, interrupt::take!(USART1));
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#[cfg(feature = "stm32g071rb")]
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let (mut tx, mut rx, mut usart, mut irq) = (p.PC4, p.PC5, p.USART1, interrupt::take!(USART1));
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#[cfg(feature = "stm32f429zi")]
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let (mut tx, mut rx, mut usart, mut irq) = (p.PG14, p.PG9, p.USART6, interrupt::take!(USART6));
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#[cfg(feature = "stm32wb55rg")]
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let (mut tx, mut rx, mut usart, mut irq) = (p.PA2, p.PA3, p.LPUART1, interrupt::take!(LPUART1));
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#[cfg(feature = "stm32h755zi")]
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let (mut tx, mut rx, mut usart, mut irq) = (p.PB6, p.PB7, p.USART1, interrupt::take!(USART1));
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#[cfg(feature = "stm32u585ai")]
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let (mut tx, mut rx, mut usart, mut irq) = (p.PD8, p.PD9, p.USART3, interrupt::take!(USART3));
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#[cfg(feature = "stm32h563zi")]
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let (mut tx, mut rx, mut usart, mut irq) = (p.PB6, p.PB7, p.LPUART1, interrupt::take!(LPUART1));
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#[cfg(feature = "stm32c031c6")]
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let (mut tx, mut rx, mut usart, mut irq) = (p.PB6, p.PB7, p.USART1, interrupt::take!(USART1));
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{
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let config = Config::default();
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let mut usart = Uart::new(&mut usart, &mut rx, &mut tx, &mut irq, NoDma, NoDma, 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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usart.blocking_write(&data).unwrap();
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let mut buf = [0; 2];
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usart.blocking_read(&mut buf).unwrap();
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assert_eq!(buf, data);
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}
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// Test error handling with with an overflow error
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{
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let config = Config::default();
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let mut usart = Uart::new(&mut usart, &mut rx, &mut tx, &mut irq, NoDma, NoDma, config);
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// Send enough bytes to fill the RX FIFOs off all USART versions.
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let data = [0xC0, 0xDE, 0x12, 0x23, 0x34];
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usart.blocking_write(&data).unwrap();
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usart.blocking_flush().unwrap();
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// The error should be reported first.
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let mut buf = [0; 1];
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let err = usart.blocking_read(&mut buf);
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assert_eq!(err, Err(Error::Overrun));
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// At least the first data byte should still be available on all USART versions.
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usart.blocking_read(&mut buf).unwrap();
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assert_eq!(buf[0], data[0]);
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}
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// Test that baudrate divider is calculated correctly.
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// Do it by comparing the time it takes to send a known number of bytes.
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for baudrate in [
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300,
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9600,
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115200,
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250_000,
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337_934,
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#[cfg(not(feature = "stm32f103c8"))]
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1_000_000,
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#[cfg(not(feature = "stm32f103c8"))]
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2_000_000,
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] {
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info!("testing baudrate {}", baudrate);
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let mut config = Config::default();
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config.baudrate = baudrate;
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let mut usart = Uart::new(&mut usart, &mut rx, &mut tx, &mut irq, NoDma, NoDma, config);
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let n = (baudrate as usize / 100).max(64);
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let start = Instant::now();
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for _ in 0..n {
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usart.blocking_write(&[0x00]).unwrap();
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}
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let dur = Instant::now() - start;
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let want_dur = Duration::from_micros(n as u64 * 10 * 1_000_000 / (baudrate as u64));
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let fuzz = want_dur / 5;
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if dur < want_dur - fuzz || dur > want_dur + fuzz {
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defmt::panic!(
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"bad duration for baudrate {}: got {:?} want {:?}",
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baudrate,
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dur,
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want_dur
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);
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}
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}
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info!("Test OK");
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cortex_m::asm::bkpt();
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}
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