cpu/qn908x/periph_timer: Implement timer_set() #19087
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This fixes test failures in tests/periph_timer_short_relative_set. Note: This differs a bit from the implementation in e.g. nRF5x or STM32 in that it always briefly pauses the timer. The issue is that when running the timer can take a few ticks to actually react to the new compare target. So even if the previously written target is still in the future, the timer may not fire anyway. Pausing the timer while setting and setting the target at least one higher than the current count reliably triggers the IRQ.
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🕐 Waiting for PR status (GitHub check) to be set, probably by CI. Bors will automatically try to run when all required PR statuses are set. |
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bors merge |
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Build succeeded: |
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Thx :) |
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Contribution description
This fixes test failures in tests/periph_timer_short_relative_set.
Note: This differs a bit from the implementation in e.g. nRF5x or STM32 in that it always briefly pauses the timer. The issue is that when running the timer can take a few ticks to actually react to the new compare target. So even if the previously written target is still in the future, the timer may not fire anyway. Pausing the timer while setting and setting the target at least one higher than the current count reliably triggers the IRQ.
Testing procedure
Run
tests/periph_timer_short_relative_setat least a few dozen times (or use #19030 to have a few dozen repetitions of the test case in a single run of the test application). It should now succeed.Issues/PRs references
None