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Use saturating_sub to make sure we don't overflow

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Jomer.Dev 2024-01-29 17:14:23 +01:00
parent 681393150d
commit 0708ce1410
1 changed files with 2 additions and 2 deletions
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embassy-rp/src/uart/mod.rs
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@ -604,8 +604,8 @@ impl<'d, T: Instance> UartRx<'d, T, Async> {
return match (all_full, last_was_break) { return match (all_full, last_was_break) {
(true, true) | (false, _) => { (true, true) | (false, _) => {
// We got less than the full amount + a break, or the full amount // We got less than the full amount + a break, or the full amount
// and the last byte was a break. Subtract the break off. // and the last byte was a break. Subtract the break off by adding one to sval.
Ok((next_addr - 1) - sval) Ok(next_addr.saturating_sub(1 + sval))
} }
(true, false) => { (true, false) => {
// We finished the whole DMA, and the last DMA'd byte was NOT a break // We finished the whole DMA, and the last DMA'd byte was NOT a break