diff options
| -rw-r--r-- | ports/stm32/rtc.c | 7 |
1 files changed, 4 insertions, 3 deletions
diff --git a/ports/stm32/rtc.c b/ports/stm32/rtc.c index 029da5fc0..de4988994 100644 --- a/ports/stm32/rtc.c +++ b/ports/stm32/rtc.c @@ -132,13 +132,14 @@ void rtc_init_start(bool force_init) { // provide some status information rtc_info |= 0x40000 | (RCC->BDCR & 7) | (RCC->CSR & 3) << 8; return; - } else if (((RCC->BDCR & RCC_BDCR_RTCSEL) == RCC_BDCR_RTCSEL_1) && ((RCC->CSR & 3) == 3)) { - // LSI configured & enabled & ready --> no need to (re-)init RTC + } else if ((RCC->BDCR & RCC_BDCR_RTCSEL) == RCC_BDCR_RTCSEL_1) { + // LSI configured as the RTC clock source --> no need to (re-)init RTC // remove Backup Domain write protection HAL_PWR_EnableBkUpAccess(); // Clear source Reset Flag __HAL_RCC_CLEAR_RESET_FLAGS(); - RCC->CSR |= 1; + // Turn the LSI on (it may need this even if the RTC is running) + RCC->CSR |= RCC_CSR_LSION; // provide some status information rtc_info |= 0x80000 | (RCC->BDCR & 7) | (RCC->CSR & 3) << 8; return; |