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RTC. Driver improvements 

git-svn-id: svn://svn.code.sf.net/p/chibios/svn/trunk@3352 35acf78f-673a-0410-8e92-d51de3d6d3f4
master
barthess 2011-09-19 13:54:07 +00:00
parent 9ced1d4e65
commit 31a099cb10
3 changed files with 45 additions and 22 deletions
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9
os/hal/dox/rtc.dox
View File

@ -30,5 +30,14 @@
* @pre In order to use the RTC driver the @p HAL_USE_RTC option
* must be enabled in @p halconf.h.
*
* @note STM32 Errata notes:
* Description
* When the LSIRDY flag is set, the clock may still be out of the
* specified frequency range (fLSI parameter, see LSI oscillator
* characteristics in the product datasheet).
* Workaround
* To have a fully stabilized clock in the specified range, a
* software temporization of 100 uS should be added.
*
* @ingroup IO
*/

41
os/hal/platforms/STM32/rtc_lld.c
View File

@ -112,29 +112,42 @@ CH_IRQ_HANDLER(RTC_IRQHandler) {
* @notapi
*/
void rtc_lld_init(void){
rccEnableBKP(FALSE); /* enable interface clocking */
PWR->CR |= PWR_CR_DBP; /* enable access */
rccEnableBKPInterface(FALSE);
if (!(RCC->BDCR & (RCC_BDCR_RTCEN | RCC_BDCR_LSEON))){ /* BKP domain was reseted */
RCC->BDCR |= RTC_CLOCK_SOURCE; /* select clocking from LSE */
RCC->BDCR |= RCC_BDCR_LSEON; /* switch LSE on */
while(!(RCC->BDCR & RCC_BDCR_LSEON)) /* wait for stabilization */
/* Ensure that RTC_CNT and RTC_DIV contain actual values after enabling
* clocking on APB1, because these values only update when APB1 functioning.*/
RTC->CRL &= ~(RTC_CRL_RSF);
while (!(RTC->CRL & RTC_CRL_RSF))
;
RCC->BDCR |= RCC_BDCR_RTCEN; /* run clock */
/* enable access to BKP registers */
PWR->CR |= PWR_CR_DBP;
if (! ((RCC->BDCR & RCC_BDCR_RTCEN) || (RCC->BDCR & RCC_BDCR_LSEON))){
RCC->BDCR |= RTC_CLOCK_SOURCE;
/* for LSE source we must wait until source became stable */
#if defined(RTC_CLOCK_SOURCE) == defined(RCC_BDCR_RTCSEL_LSE)
RCC->BDCR |= RCC_BDCR_LSEON;
while(!(RCC->BDCR & RCC_BDCR_LSERDY))
;
#endif
RCC->BDCR |= RCC_BDCR_RTCEN;
}
#if defined(RTC_CLOCK_SOURCE) == defined(RCC_BDCR_RTCSEL_LSE)
uint32_t preload = STM32_LSECLK - 1UL;
uint32_t preload = STM32_LSECLK - 1;
#elif defined(RTC_CLOCK_SOURCE) == defined(RCC_BDCR_RTCSEL_LSI)
uint32_t preload = STM32_LSICLK - 1UL;
uint32_t preload = STM32_LSICLK - 1;
#elif defined(RTC_CLOCK_SOURCE) == defined(RCC_BDCR_RTCSEL_HSE)
uint32_t preload = (STM32_HSICLK / 128UL) - 1UL;
uint32_t preload = (STM32_HSICLK / 128) - 1;
#else
#error "RTC clock source not selected"
#endif /* RTC_CLOCK_SOURCE == RCC_BDCR_RTCSEL_LSE */
/* Write preload register only if value changed */
if (preload != (((uint32_t)(RTC->PRLH)) << 16) + RTC->PRLH){
if (preload != ((((uint32_t)(RTC->PRLH)) << 16) + RTC->PRLL)){
while(!(RTC->CRL & RTC_CRL_RTOFF))
;
@ -147,12 +160,6 @@ void rtc_lld_init(void){
;
}
/* Ensure that RTC_CNT and RTC_DIV contain actual values after enabling
* clocking on APB1, because these values only update when APB1 functioning.*/
RTC->CRL &= ~(RTC_CRL_RSF);
while (!(RTC->CRL & RTC_CRL_RSF))
;
/* disable all interrupts and clear all even flags just to be safe */
RTC->CRH &= ~(RTC_CRH_OWIE | RTC_CRH_ALRIE | RTC_CRH_SECIE);
RTC->CRL &= ~(RTC_CRL_SECF | RTC_CRL_ALRF | RTC_CRL_OWF);

17
os/hal/platforms/STM32F1xx/stm32_rcc.h
View File

@ -203,7 +203,7 @@
/** @} */
/**
* @brief Bakup domain interface specific RCC operations
* @brief Backup domain interface specific RCC operations
* @{
*/
/**
@ -214,7 +214,7 @@
*
* @api
*/
#define rccEnableBKP(lp) \
#define rccEnableBKPInterface(lp) \
rccEnableAPB1((RCC_APB1ENR_BKPEN | RCC_APB1ENR_PWREN), lp);
/**
@ -225,15 +225,22 @@
*
* @api
*/
#define rccDisableBKP(lp) \
#define rccDisableBKPInterface(lp) \
rccDisableAPB1((RCC_APB1ENR_BKPEN | RCC_APB1ENR_PWREN), lp);
/**
* @brief Resets the Backup Domain.
* @brief Resets the Backup Domain interface.
*
* @api
*/
#define rccResetBKP(lp) rccResetAPB1(RCC_APB1ENR_BKPRST);
#define rccResetBKPInterface() rccResetAPB1(RCC_APB1ENR_BKPRST);
/**
* @brief Resets the entire Backup Domain.
*
* @api
*/
#define rccResetBKP() (RCC->BDCR |= RCC_BDCR_BDRST);
/** @} */
/**