fetch RTC count more atomically #6004
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@jwfmcclain I think this will fix the problem. The artifacts from this build are here: https://github.com/adafruit/circuitpython/actions/runs/1820321229, so you can download a build and try it. |
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Fixes time.monotonic_ns sometimes jumps forward, and then returns the correct value on the next call #5985.
Fetch RTC counter inside critical section.
Handle case where counter has rolled over but overflow interrupt has not yet occurred.
Thanks to:
https://github.com/tinygo-org/tinygo/blob/release/src/runtime/runtime_atsamd51.go
tinygo-org/tinygo#1870
https://www.eevblog.com/forum/microcontrollers/correct-timing-by-timer-overflow-count/