diff options
| author | iabdalkader <i.abdalkader@gmail.com> | 2020-12-02 23:35:58 +0200 |
|---|---|---|
| committer | Damien George <damien@micropython.org> | 2020-12-07 17:00:21 +1100 |
| commit | 8add94e94e906ecf6c46d49127a8a0590be308b8 (patch) | |
| tree | 108970a51c1285744da215af129a5a862ab64805 | |
| parent | 463a275bc4e99a1d37d523a120fe45976ea021fe (diff) | |
stm32/powerctrl: Disable RTC write protection before changing flags.
| -rw-r--r-- | ports/stm32/powerctrl.c | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/ports/stm32/powerctrl.c b/ports/stm32/powerctrl.c index c36351e31..ce2f6e190 100644 --- a/ports/stm32/powerctrl.c +++ b/ports/stm32/powerctrl.c @@ -689,6 +689,10 @@ void powerctrl_enter_standby_mode(void) { // save RTC interrupts uint32_t save_irq_bits = RTC->CR & CR_BITS; + // disable register write protection + RTC->WPR = 0xca; + RTC->WPR = 0x53; + // disable RTC interrupts RTC->CR &= ~CR_BITS; @@ -714,6 +718,9 @@ void powerctrl_enter_standby_mode(void) { // enable previously-enabled RTC interrupts RTC->CR |= save_irq_bits; + // enable register write protection + RTC->WPR = 0xff; + #if defined(STM32F7) // Enable the internal (eg RTC) wakeup sources // See Errata 2.2.2 "Wakeup from Standby mode when the back-up SRAM regulator is enabled" |