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Add a comment on cur_count variable #117

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Merged
eldruin merged 1 commit into from
Apr 13, 2026
Merged

Add a comment on cur_count variable #117

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6 changes: 6 additions & 0 deletions mdbook/src/15-interrupts/examples/count-debounce.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -67,6 +67,12 @@ fn main() -> ! {
unsafe { pac::NVIC::unmask(pac::Interrupt::GPIOTE) };
pac::NVIC::unpend(pac::Interrupt::GPIOTE);

// Because we're not disabling GPIOTE interrupts even during the debounce timer countdown,
// we can get extra button interrupts even during the debounce interval.
// It would be reasonable to disable button interrupts when the debounce timer is started
// and re-enable them when it expires, but this would require a debounce timer interrupt handler.
// To make a simple "fix" for this that doesn't hurt the readability,
// we introduce the cur_count "guard" variable.
let mut cur_count = 0;
loop {
// "wait for interrupt": CPU goes to sleep until an interrupt.
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