15574cd665
This commit adds time.ticks_ms/us support using RTC1 as the timebase. It also adds the time.ticks_add/diff helper functions. This feature can be enabled using MICROPY_PY_TIME_TICKS. If disabled the system uses the legacy sleep methods and does not have any ticks functions. In addition support for MICROPY_EVENT_POLL_HOOK was added to the time.sleep_ms(x) function, making this function more power efficient and allows support for select.poll/asyncio. To support this, the RTC's CCR0 was used to schedule a ~1msec event to wakeup the CPU. Some important notes about the RTC timebase: - Since the granularity of RTC1's ticks are approx 30usec, time.ticks_us is not perfect, does not have 1us resolution, but is otherwise quite usable. For tighter measurments the ticker's 1MHz counter should be used. - time.ticks_ms(x) should *not* be called in an IRQ with higher prio than the RTC overflow irq (3). If so it introduces a race condition and possibly leads to wrong tick calculations. See #6171 and #6202. |
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