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RTC. Minor documentation improvements. 

git-svn-id: svn://svn.code.sf.net/p/chibios/svn/trunk@3378 35acf78f-673a-0410-8e92-d51de3d6d3f4
This commit is contained in:
barthess 2011-09-21 17:42:30 +00:00
parent ae42ff1857
commit 8dfb19e436
1 changed files with 4 additions and 3 deletions
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7
os/hal/platforms/STM32/rtc_lld.c
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@ -109,13 +109,15 @@ CH_IRQ_HANDLER(RTC_IRQHandler) {
* @brief Enable access to registers and initialize RTC if BKP domain * @brief Enable access to registers and initialize RTC if BKP domain
* was previously reseted. * was previously reseted.
* *
* @note: Cold start time of LSE oscillator on STM32 platform
* takes about 3 seconds.
*
* @notapi * @notapi
*/ */
void rtc_lld_init(void){ void rtc_lld_init(void){
uint32_t preload = 0; uint32_t preload = 0;
rccEnableBKPInterface(FALSE); rccEnableBKPInterface(FALSE);
//RCC->APB1ENR |= (RCC_APB1ENR_BKPEN | RCC_APB1ENR_PWREN);
/* enable access to BKP registers */ /* enable access to BKP registers */
PWR->CR |= PWR_CR_DBP; PWR->CR |= PWR_CR_DBP;
@ -124,8 +126,7 @@ void rtc_lld_init(void){
#if STM32_RTC == STM32_RTC_LSE #if STM32_RTC == STM32_RTC_LSE
if (! ((RCC->BDCR & RCC_BDCR_RTCEN) || (RCC->BDCR & RCC_BDCR_LSEON))){ if (! ((RCC->BDCR & RCC_BDCR_RTCEN) || (RCC->BDCR & RCC_BDCR_LSEON))){
RCC->BDCR |= RCC_BDCR_LSEON; RCC->BDCR |= RCC_BDCR_LSEON;
/* Note: cold start time of LSE oscillator on STM32 is about 3 seconds. */
while(!(RCC->BDCR & RCC_BDCR_LSERDY)) while(!(RCC->BDCR & RCC_BDCR_LSERDY))
; ;
RCC->BDCR |= RCC_BDCR_RTCEN; RCC->BDCR |= RCC_BDCR_RTCEN;