Calendar
Calendar Partially Functions Abnormally
- Description
When the internal RC oscillator is used as the slow-speed system clock, the calendar calibration fails, and the Calendar module cannot work properly.
- Cause
During hardware design, the Calendar module is not expected to support using the internal RC oscillator as the clock source.
- Impact
There is no clock input, so calendar calibration fails, and the Calendar module cannot work properly.
- Recommended Workaround
Note that when the internal RC oscillator is chosen (in custom_config.h) as the slow-speed system clock, both the app_rtc and alarm cannot work properly. To avoid this limitation, you can choose 32K RTC as the slow-speed system clock.
The recommended workaround is available on GR551x SDK V1.6.06 and later versions.