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Implement rtc_poweron function

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This commit is contained in:
lakshbhatia 2016-03-01 19:11:38 +01:00
parent 22e291132e
commit 1db5d41935
1 changed files with 22 additions and 22 deletions
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44
cpu/stm32l1/periph/rtc.c
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@ -48,31 +48,12 @@ static uint8_t byte2bcd(uint8_t value);
/** /**
* @brief Initializes the RTC to use LSE (external 32.768 kHz oscillator) as a * @brief Initializes the RTC to use LSE (external 32.768 kHz oscillator) as a
* clocl source. Verify that your board has this oscillator. If other clock * clock source. Verify that your board has this oscillator. If other clock
* source is used, then also the prescaler constants should be changed. * source is used, then also the prescaler constants should be changed.
*/ */
void rtc_init(void) void rtc_init(void)
{ {
/* Enable write access to RTC registers */ rtc_poweron();
RCC->APB1ENR |= RCC_APB1ENR_PWREN;
PWR->CR |= PWR_CR_DBP;
/* Reset RTC domain */
RCC->CSR |= RCC_CSR_RTCRST;
RCC->CSR &= ~(RCC_CSR_RTCRST);
/* Enable the LSE clock (external 32.768 kHz oscillator) */
RCC->CSR &= ~(RCC_CSR_LSEON);
RCC->CSR &= ~(RCC_CSR_LSEBYP);
RCC->CSR |= RCC_CSR_LSEON;
while ( (RCC->CSR & RCC_CSR_LSERDY) == 0 );
/* Switch RTC to LSE clock source */
RCC->CSR &= ~(RCC_CSR_RTCSEL);
RCC->CSR |= RCC_CSR_RTCSEL_LSE;
/* Enable the RTC */
RCC->CSR |= RCC_CSR_RTCEN;
/* Unlock RTC write protection */ /* Unlock RTC write protection */
RTC->WPR = RTC_WRITE_PROTECTION_KEY1; RTC->WPR = RTC_WRITE_PROTECTION_KEY1;
@ -211,7 +192,26 @@ void rtc_clear_alarm(void)
void rtc_poweron(void) void rtc_poweron(void)
{ {
/* RTC on STM32L1 is online even on sleep modes. No need to power on. */ /* Enable write access to RTC registers */
RCC->APB1ENR |= RCC_APB1ENR_PWREN;
PWR->CR |= PWR_CR_DBP;
/* Reset RTC domain */
RCC->CSR |= RCC_CSR_RTCRST;
RCC->CSR &= ~(RCC_CSR_RTCRST);
/* Enable the LSE clock (external 32.768 kHz oscillator) */
RCC->CSR &= ~(RCC_CSR_LSEON);
RCC->CSR &= ~(RCC_CSR_LSEBYP);
RCC->CSR |= RCC_CSR_LSEON;
while ( (RCC->CSR & RCC_CSR_LSERDY) == 0 );
/* Switch RTC to LSE clock source */
RCC->CSR &= ~(RCC_CSR_RTCSEL);
RCC->CSR |= RCC_CSR_RTCSEL_LSE;
/* Enable the RTC */
RCC->CSR |= RCC_CSR_RTCEN;
} }
void rtc_poweroff(void) void rtc_poweroff(void)