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rtc: fix rtcinstant delay computation

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This commit is contained in:
xoviat 2023-08-21 18:33:10 -05:00
parent 5bfddfc9b6
commit 8878ce046c
1 changed files with 4 additions and 3 deletions
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7
embassy-stm32/src/rtc/v2.rs
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@ -54,8 +54,8 @@ impl core::ops::Sub for RtcInstant {
trace!("self st: {}", st);
let self_ticks = st as u32 * 256 + self.ssr as u32;
let other_ticks = rhs.st as u32 * 256 + rhs.ssr as u32;
let self_ticks = st as u32 * 256 + (255 - self.ssr as u32);
let other_ticks = rhs.st as u32 * 256 + (255 - rhs.ssr as u32);
let rtc_ticks = self_ticks - other_ticks;
trace!("self ticks: {}", self_ticks);
@ -65,7 +65,8 @@ impl core::ops::Sub for RtcInstant {
// TODO: read prescaler
Duration::from_ticks(
((((st as u32 * 256 + self.ssr as u32) - (rhs.st as u32 * 256 + rhs.ssr as u32)) * TICK_HZ as u32) as u32
((((st as u32 * 256 + (255u32 - self.ssr as u32)) - (rhs.st as u32 * 256 + (255u32 - rhs.ssr as u32)))
* TICK_HZ as u32) as u32
/ 256u32) as u64,
)
}