robert-hh e33db80a59 samd/clock_config: Extend the SAMD51 us-counter to 60 bit. ... This removes the difference in the time.ticks_us() range between SAMD21 and SAMD51. The function mp_hal_ticks_us_64() is added and used for: - SAMD51's mp_hal_ticks_us and mp_hal_delay_us(). For SAMD21, keep the previous methods, which are faster. - mp_hal_ticks_ms() and mp_hal_tick_ms_64(), which saves some bytes and removes a potential race condition every 50 days. Also set the us-counter for SAMD51 to 16 MHz for a faster reading of the microsecond value. Note: With SAMD51, mp_hal_ticks_us_64() has a 60 bit range only, which is still a long time (~36000 years).		2022-10-25 23:26:14 +11:00
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samd21	samd/machine_rtc: Add the machine.RTC class.	2022-10-25 23:20:09 +11:00
samd51	samd/clock_config: Extend the SAMD51 us-counter to 60 bit.	2022-10-25 23:26:14 +11:00