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stm32/dma: don't write to full ringbuf

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xoviat 2023-07-30 10:57:17 -05:00
parent 087e649bc2
commit 6f30e92c7a
1 changed files with 2 additions and 0 deletions
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embassy-stm32/src/dma/ringbuffer.rs
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@ -243,6 +243,8 @@ impl<'a, W: Word> WritableDmaRingBuffer<'a, W> {
Ok((len, self.cap() - (start - self.end))) Ok((len, self.cap() - (start - self.end)))
} }
} else if start == self.end && dma.get_complete_count() == 0 {
Ok((0, 0))
} else if start <= self.end && self.end + buf.len() < self.cap() { } else if start <= self.end && self.end + buf.len() < self.cap() {
// The occupied portion in the ring buffer DOES NOT wrap // The occupied portion in the ring buffer DOES NOT wrap
// and copying elements into the buffer WILL NOT cause it to // and copying elements into the buffer WILL NOT cause it to