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stm32/timer: Fix frequency off-by-one

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This commit is contained in:
Grant Miller 2023-12-01 22:06:48 -06:00
parent ce4dd67f3b
commit 8c0e2748db
1 changed files with 4 additions and 1 deletions
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5
embassy-stm32/src/timer/mod.rs
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@ -46,7 +46,10 @@ pub(crate) mod sealed {
assert!(f > 0); assert!(f > 0);
let pclk_ticks_per_timer_period = timer_f / f; let pclk_ticks_per_timer_period = timer_f / f;
let psc: u16 = unwrap!(((pclk_ticks_per_timer_period - 1) / (1 << 16)).try_into()); let psc: u16 = unwrap!(((pclk_ticks_per_timer_period - 1) / (1 << 16)).try_into());
let arr: u16 = unwrap!((pclk_ticks_per_timer_period / (u32::from(psc) + 1)).try_into()); let divide_by = pclk_ticks_per_timer_period / (u32::from(psc) + 1);
// the timer counts `0..=arr`, we want it to count `0..divide_by`
let arr = unwrap!(u16::try_from(divide_by - 1));
let regs = Self::regs(); let regs = Self::regs();
regs.psc().write(|r| r.set_psc(psc)); regs.psc().write(|r| r.set_psc(psc));