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    • Damien George's avatar
    • T S's avatar
      stmhal: Implement delayed RTC initialization with LSI fallback. · 86aa16be
      T S authored
      If RTC is already running at boot then it's left alone.  Otherwise, RTC is
      started at boot but startup function returns straight away.  RTC startup
      is then finished the first time it is used.  Fallback to LSI if LSE fails
      to start in a certain time.
      
      Also included:
       MICROPY_HW_CLK_LAST_FREQ
              hold pyb.freq() parameters in RTC backup reg
       MICROPY_HW_RTC_USE_US
              option to present datetime sub-seconds in microseconds
       MICROPY_HW_RTC_USE_CALOUT
              option to enable RTC calibration output
      
      CLK_LAST_FREQ and RTC_USE_CALOUT are enabled for PYBv1.0.
      86aa16be