[Enhancement] Add date retention support to stm32f1xx boards #1187
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Add date retention for the stm32f1xx
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Hi @josh-gaby |
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Replaced by stm32duino/STM32RTC#41 |
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Add date retention through power cycles on stm32f1xx based boards
On these chips, the date details are only stored in SRAM while running, because of this, dates are not being retained after a power off even with VBAT connected.
This is fixed by using backup registers DR2 and DR3 to store the date data each time it is updated by HAL_RTC_SetDate and whenever RTC_DateUpdate is called. Doing this means that the date can then extracted when the RTC is next initialized.