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stm32/usart: add baudrate calc test.

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This commit is contained in:
Dario Nieuwenhuis 2023-05-02 02:52:37 +02:00
parent a61701b756
commit 2bb6e93e86
4 changed files with 72 additions and 24 deletions
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1
tests/stm32/Cargo.toml
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@ -3,6 +3,7 @@ edition = "2021"
name = "embassy-stm32-tests"
version = "0.1.0"
license = "MIT OR Apache-2.0"
autobins = false
[features]
stm32f103c8 = ["embassy-stm32/stm32f103c8", "not-gpdma"] # Blue Pill

9
tests/stm32/build.rs
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@ -6,15 +6,16 @@ fn main() -> Result<(), Box<dyn Error>> {
let out = PathBuf::from(env::var("OUT_DIR").unwrap());
fs::write(out.join("link_ram.x"), include_bytes!("link_ram.x")).unwrap();
println!("cargo:rustc-link-search={}", out.display());
println!("cargo:rerun-if-changed=link_ram.x");
println!("cargo:rustc-link-arg-bins=--nmagic");
// too little RAM to run from RAM.
#[cfg(any(feature = "stm32c031c6"))]
if cfg!(any(feature = "stm32c031c6")) {
println!("cargo:rustc-link-arg-bins=-Tlink.x");
#[cfg(not(any(feature = "stm32c031c6")))]
println!("cargo:rerun-if-changed=link.x");
} else {
println!("cargo:rustc-link-arg-bins=-Tlink_ram.x");
println!("cargo:rerun-if-changed=link_ram.x");
}
println!("cargo:rustc-link-arg-bins=-Tdefmt.x");

61
tests/stm32/src/bin/usart.rs
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@ -9,6 +9,7 @@ use embassy_executor::Spawner;
use embassy_stm32::dma::NoDma;
use embassy_stm32::interrupt;
use embassy_stm32::usart::{Config, Uart};
use embassy_time::{Duration, Instant};
use example_common::*;
#[embassy_executor::main]
@ -19,26 +20,27 @@ async fn main(_spawner: Spawner) {
// Arduino pins D0 and D1
// They're connected together with a 1K resistor.
#[cfg(feature = "stm32f103c8")]
let (tx, rx, usart, irq) = (p.PA9, p.PA10, p.USART1, interrupt::take!(USART1));
let (mut tx, mut rx, mut usart, mut irq) = (p.PA9, p.PA10, p.USART1, interrupt::take!(USART1));
#[cfg(feature = "stm32g491re")]
let (tx, rx, usart, irq) = (p.PC4, p.PC5, p.USART1, interrupt::take!(USART1));
let (mut tx, mut rx, mut usart, mut irq) = (p.PC4, p.PC5, p.USART1, interrupt::take!(USART1));
#[cfg(feature = "stm32g071rb")]
let (tx, rx, usart, irq) = (p.PC4, p.PC5, p.USART1, interrupt::take!(USART1));
let (mut tx, mut rx, mut usart, mut irq) = (p.PC4, p.PC5, p.USART1, interrupt::take!(USART1));
#[cfg(feature = "stm32f429zi")]
let (tx, rx, usart, irq) = (p.PG14, p.PG9, p.USART6, interrupt::take!(USART6));
let (mut tx, mut rx, mut usart, mut irq) = (p.PG14, p.PG9, p.USART6, interrupt::take!(USART6));
#[cfg(feature = "stm32wb55rg")]
let (tx, rx, usart, irq) = (p.PA2, p.PA3, p.LPUART1, interrupt::take!(LPUART1));
let (mut tx, mut rx, mut usart, mut irq) = (p.PA2, p.PA3, p.LPUART1, interrupt::take!(LPUART1));
#[cfg(feature = "stm32h755zi")]
let (tx, rx, usart, irq) = (p.PB6, p.PB7, p.USART1, interrupt::take!(USART1));
let (mut tx, mut rx, mut usart, mut irq) = (p.PB6, p.PB7, p.USART1, interrupt::take!(USART1));
#[cfg(feature = "stm32u585ai")]
let (tx, rx, usart, irq) = (p.PD8, p.PD9, p.USART3, interrupt::take!(USART3));
let (mut tx, mut rx, mut usart, mut irq) = (p.PD8, p.PD9, p.USART3, interrupt::take!(USART3));
#[cfg(feature = "stm32h563zi")]
let (tx, rx, usart, irq) = (p.PB6, p.PB7, p.LPUART1, interrupt::take!(LPUART1));
let (mut tx, mut rx, mut usart, mut irq) = (p.PB6, p.PB7, p.LPUART1, interrupt::take!(LPUART1));
#[cfg(feature = "stm32c031c6")]
let (tx, rx, usart, irq) = (p.PB6, p.PB7, p.USART1, interrupt::take!(USART1));
let (mut tx, mut rx, mut usart, mut irq) = (p.PB6, p.PB7, p.USART1, interrupt::take!(USART1));
{
let config = Config::default();
let mut usart = Uart::new(usart, rx, tx, irq, NoDma, NoDma, config);
let mut usart = Uart::new(&mut usart, &mut rx, &mut tx, &mut irq, NoDma, NoDma, config);
// We can't send too many bytes, they have to fit in the FIFO.
// This is because we aren't sending+receiving at the same time.
@ -49,6 +51,45 @@ async fn main(_spawner: Spawner) {
let mut buf = [0; 2];
usart.blocking_read(&mut buf).unwrap();
assert_eq!(buf, data);
}
// Test that baudrate divider is calculated correctly.
// Do it by comparing the time it takes to send a known number of bytes.
for baudrate in [
300,
9600,
115200,
250_000,
337_934,
#[cfg(not(feature = "stm32f103c8"))]
1_000_000,
#[cfg(not(feature = "stm32f103c8"))]
2_000_000,
] {
info!("testing baudrate {}", baudrate);
let mut config = Config::default();
config.baudrate = baudrate;
let mut usart = Uart::new(&mut usart, &mut rx, &mut tx, &mut irq, NoDma, NoDma, config);
let n = (baudrate as usize / 100).max(64);
let start = Instant::now();
for _ in 0..n {
usart.blocking_write(&[0x00]).unwrap();
}
let dur = Instant::now() - start;
let want_dur = Duration::from_micros(n as u64 * 10 * 1_000_000 / (baudrate as u64));
let fuzz = want_dur / 5;
if dur < want_dur - fuzz || dur > want_dur + fuzz {
defmt::panic!(
"bad duration for baudrate {}: got {:?} want {:?}",
baudrate,
dur,
want_dur
);
}
}
info!("Test OK");
cortex_m::asm::bkpt();

5
tests/stm32/src/example_common.rs
View File

@ -16,5 +16,10 @@ pub fn config() -> Config {
config.rcc.pll1.q_ck = Some(Hertz(100_000_000));
}
#[cfg(feature = "stm32u585ai")]
{
config.rcc.mux = embassy_stm32::rcc::ClockSrc::MSI(embassy_stm32::rcc::MSIRange::Range48mhz);
}
config
}