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stm32: adc: fix blocking_delay_us() overflowing when sys freq is high

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e.g. H503 running at 250 MHz resulted in an upper bound of 17 us here.
casting up to u64 for intermediate calc allows the upper bound to be
increased by a factor of 1e6
This commit is contained in:
Torin Cooper-Bennun 2024-04-16 15:13:31 +01:00
parent 8e850de592
commit d928663bae
1 changed files with 6 additions and 1 deletions
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7
embassy-stm32/src/adc/mod.rs
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@ -76,7 +76,12 @@ pub(crate) fn blocking_delay_us(us: u32) {
#[cfg(time)]
embassy_time::block_for(embassy_time::Duration::from_micros(us));
#[cfg(not(time))]
cortex_m::asm::delay(unsafe { crate::rcc::get_freqs() }.sys.unwrap().0 * us / 1_000_000);
{
let freq = unsafe { crate::rcc::get_freqs() }.sys.unwrap().0 as u64;
let us = us as u64;
let cycles = freq * us / 1_000_000;
cortex_m::asm::delay(cycles as u32);
}
}
/// ADC instance.