diff options
| -rw-r--r-- | stmhal/rtc.c | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/stmhal/rtc.c b/stmhal/rtc.c index 6bed3d1e62..1d349a6e90 100644 --- a/stmhal/rtc.c +++ b/stmhal/rtc.c @@ -178,6 +178,17 @@ void rtc_init(void) { RTCHandle.Init.OutPutPolarity = RTC_OUTPUT_POLARITY_HIGH; RTCHandle.Init.OutPutType = RTC_OUTPUT_TYPE_OPENDRAIN; + // if LTE enabled & ready --> no need to (re-)init RTC + if ((RCC->BDCR & (RCC_BDCR_LSEON | RCC_BDCR_LSERDY)) == (RCC_BDCR_LSEON | RCC_BDCR_LSERDY)) { + // remove Backup Domain write protection + PWR->CR |= PWR_CR_DBP; + // Clear source Reset Flag + __HAL_RCC_CLEAR_RESET_FLAGS(); + // provide some status information + rtc_info |= 0x40000 | (RCC->BDCR & 7) | (RCC->CSR & 3) << 8; + return; + } + mp_uint_t tick = HAL_GetTick(); if (HAL_RTC_Init(&RTCHandle) != HAL_OK) { |