/**
* @brief Set current time.
* @note Fractional part will be silently ignored. There is no possibility
* to change it on STM32F1xx platform.
*
* @param[in] rtcp pointer to RTC driver structure
* @param[in] timespec pointer to a @p RTCTime structure
*
* @notapi
*/
void rtc_lld_set_time(RTCDriver *rtcp, const RTCTime *timespec) {
(void)rtcp;
rtc_lld_acquire();
RTC->CNTH = (uint16_t)(timespec->tv_sec >> 16);
RTC->CNTL = (uint16_t)(timespec->tv_sec & 0xFFFF);
rtc_lld_release();
}
/**
* @brief Set alarm time.
*
* @note Default value after BKP domain reset is 0xFFFFFFFF
*
* @param[in] rtcp pointer to RTC driver structure
* @param[in] alarm alarm identifier
* @param[in] alarmspec pointer to a @p RTCAlarm structure
*
* @notapi
*/
void rtc_lld_set_alarm(RTCDriver *rtcp,
rtcalarm_t alarm,
const RTCAlarm *alarmspec) {
(void)rtcp;
(void)alarm;
rtc_lld_acquire();
if (alarmspec != NULL) {
RTC->ALRH = (uint16_t)(alarmspec->tv_sec >> 16);
RTC->ALRL = (uint16_t)(alarmspec->tv_sec & 0xFFFF);
}
/**
* @brief Enable access to registers and initialize RTC if BKP domain
* was previously reseted.
* @note: Cold start time of LSE oscillator on STM32 platform
* takes about 3 seconds.
*
* @notapi
*/
void rtc_lld_init(void){
/* Required because access to PRL.*/
rtc_lld_apb1_sync();
/* Writes preload register only if its value is not equal to desired value.*/
if (STM32_RTCCLK != (((uint32_t)(RTC->PRLH)) << 16) +
((uint32_t)RTC->PRLL) + 1) {
rtc_lld_acquire();
RTC->PRLH = (uint16_t)((STM32_RTCCLK - 1) >> 16);
RTC->PRLL = (uint16_t)((STM32_RTCCLK - 1) & 0xFFFF);
rtc_lld_release();
}
/**
* @brief Load value of RTCCLK to prescaler registers.
* @note The pre-scaler must not be set on every reset as RTC clock
* counts are lost when it is set.
* @note This function designed to be called from
* hal_lld_backup_domain_init(). Because there is only place
* where possible to detect BKP domain reset event reliably.
*
* @notapi
*/
void rtc_lld_set_prescaler(void){
rtc_lld_acquire();
RTC->PRLH = (uint16_t)((STM32_RTCCLK - 1) >> 16) & 0x000F;
RTC->PRLL = (uint16_t)(((STM32_RTCCLK - 1)) & 0xFFFF);
rtc_lld_release();
}
