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/*
ChibiOS/RT - Copyright (C) 2006,2007,2008,2009,2010,
2011,2012 Giovanni Di Sirio.
This file is part of ChibiOS/RT.
ChibiOS/RT is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
ChibiOS/RT is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
/*
Concepts and parts of this file have been contributed by Uladzimir Pylinsky
aka barthess.
*/
/**
* @file STM32/RTCv2/rtc_lld.c
* @brief STM32L1xx/STM32F2xx/STM32F4xx RTC low level driver.
*
* @addtogroup RTC
* @{
*/
#include "ch.h"
#include "hal.h"
#if HAL_USE_RTC || defined(__DOXYGEN__)
/*===========================================================================*/
/* Driver exported variables. */
/*===========================================================================*/
/**
* @brief RTC driver identifier.
*/
RTCDriver RTCD1;
/*===========================================================================*/
/* Driver local variables. */
/*===========================================================================*/
/*===========================================================================*/
/* Driver local functions. */
/*===========================================================================*/
/**
* @brief Wait for synchronization of RTC registers with APB1 bus.
* @details This function must be invoked before trying to read RTC registers.
*
* @notapi
*/
#define rtc_lld_apb1_sync() {while ((RTCD1.id_rtc->ISR & RTC_ISR_RSF) == 0);}
/**
* @brief Beginning of configuration procedure.
*
* @notapi
*/
#define rtc_lld_enter_init() { \
RTCD1.id_rtc->ISR |= RTC_ISR_INIT; \
while ((RTCD1.id_rtc->ISR & RTC_ISR_INITF) == 0) \
; \
}
/**
* @brief Finalizing of configuration procedure.
*
* @notapi
*/
#define rtc_lld_exit_init() {RTCD1.id_rtc->ISR &= ~RTC_ISR_INIT;}
/*===========================================================================*/
/* Driver interrupt handlers. */
/*===========================================================================*/
/*===========================================================================*/
/* Driver exported functions. */
/*===========================================================================*/
/**
* @brief Enable access to registers.
*
* @api
*/
void rtc_lld_init(void){
RTCD1.id_rtc = RTC;
/* Asynchronous part of preloader. Set it to maximum value. */
uint32_t prediv_a = 0x7F;
/* Disable write protection. */
RTCD1.id_rtc->WPR = 0xCA;
RTCD1.id_rtc->WPR = 0x53;
/* If calendar not init yet. */
if (!(RTC->ISR & RTC_ISR_INITS)){
rtc_lld_enter_init();
/* Prescaler register must be written in two SEPARATE writes. */
RTCD1.id_rtc->PRER = prediv_a << 16;
RTCD1.id_rtc->PRER = ((STM32_RTCCLK / (prediv_a + 1)) - 1) & 0x7FFF;
rtc_lld_exit_init();
}
}
/**
* @brief Set current time.
* @note Fractional part will be silently ignored. There is no possibility
* to set it on STM32 platform.
*
* @param[in] rtcp pointer to RTC driver structure
* @param[in] timespec pointer to a @p RTCTime structure
*
* @api
*/
void rtc_lld_set_time(RTCDriver *rtcp, const RTCTime *timespec) {
(void)rtcp;
rtc_lld_enter_init();
if (timespec->h12)
RTCD1.id_rtc->CR |= RTC_CR_FMT;
else
RTCD1.id_rtc->CR &= ~RTC_CR_FMT;
RTCD1.id_rtc->TR = timespec->tv_time;
RTCD1.id_rtc->DR = timespec->tv_date;
rtc_lld_exit_init();
}
/**
* @brief Get current time.
*
* @param[in] rtcp pointer to RTC driver structure
* @param[out] timespec pointer to a @p RTCTime structure
*
* @api
*/
void rtc_lld_get_time(RTCDriver *rtcp, RTCTime *timespec) {
(void)rtcp;
rtc_lld_apb1_sync();
#if STM32_RTC_HAS_SUBSECONDS
timespec->tv_msec =
(1000 * ((RTCD1.id_rtc->PRER & 0x7FFF) - RTCD1.id_rtc->SSR)) /
((RTCD1.id_rtc->PRER & 0x7FFF) + 1);
#endif /* STM32_RTC_HAS_SUBSECONDS */
timespec->tv_time = RTCD1.id_rtc->TR;
timespec->tv_date = RTCD1.id_rtc->DR;
}
/**
* @brief Set alarm time.
*
* @note Default value after BKP domain reset for both comparators is 0.
* @note Function does not performs any checks of alarm time validity.
*
* @param[in] rtcp Pointer to RTC driver structure.
* @param[in] alarm Alarm identifier. Can be 1 or 2.
* @param[in] alarmspec Pointer to a @p RTCAlarm structure.
*
* @api
*/
void rtc_lld_set_alarm(RTCDriver *rtcp,
rtcalarm_t alarm,
const RTCAlarm *alarmspec) {
if (alarm == 1){
if (alarmspec != NULL){
rtcp->id_rtc->CR &= ~RTC_CR_ALRAE;
while(!(rtcp->id_rtc->ISR & RTC_ISR_ALRAWF))
;
rtcp->id_rtc->ALRMAR = alarmspec->tv_datetime;
rtcp->id_rtc->CR |= RTC_CR_ALRAE;
rtcp->id_rtc->CR |= RTC_CR_ALRAIE;
}
else {
rtcp->id_rtc->CR &= ~RTC_CR_ALRAIE;
rtcp->id_rtc->CR &= ~RTC_CR_ALRAE;
}
}
else{
if (alarmspec != NULL){
rtcp->id_rtc->CR &= ~RTC_CR_ALRBE;
while(!(rtcp->id_rtc->ISR & RTC_ISR_ALRBWF))
;
rtcp->id_rtc->ALRMBR = alarmspec->tv_datetime;
rtcp->id_rtc->CR |= RTC_CR_ALRBE;
rtcp->id_rtc->CR |= RTC_CR_ALRBIE;
}
else {
rtcp->id_rtc->CR &= ~RTC_CR_ALRBIE;
rtcp->id_rtc->CR &= ~RTC_CR_ALRBE;
}
}
}
/**
* @brief Get alarm time.
*
* @param[in] rtcp pointer to RTC driver structure
* @param[in] alarm alarm identifier
* @param[out] alarmspec pointer to a @p RTCAlarm structure
*
* @api
*/
void rtc_lld_get_alarm(RTCDriver *rtcp,
rtcalarm_t alarm,
RTCAlarm *alarmspec) {
if (alarm == 1)
alarmspec->tv_datetime = rtcp->id_rtc->ALRMAR;
else
alarmspec->tv_datetime = rtcp->id_rtc->ALRMBR;
}
/**
* @brief Sets time of periodic wakeup.
*
* @note Default value after BKP domain reset is 0x0000FFFF
*
* @param[in] rtcp pointer to RTC driver structure
* @param[in] wakeupspec pointer to a @p RTCWakeup structure
*
* @api
*/
void rtcSetPeriodicWakeup_v2(RTCDriver *rtcp, RTCWakeup *wakeupspec){
chDbgCheck((wakeupspec->wakeup != 0x30000),
"rtc_lld_set_periodic_wakeup, forbidden combination");
if (wakeupspec != NULL){
rtcp->id_rtc->CR &= ~RTC_CR_WUTE;
while(!(rtcp->id_rtc->ISR & RTC_ISR_WUTWF))
;
rtcp->id_rtc->WUTR = wakeupspec->wakeup & 0xFFFF;
rtcp->id_rtc->CR = (wakeupspec->wakeup >> 16) & 0x7;
rtcp->id_rtc->CR |= RTC_CR_WUTIE;
rtcp->id_rtc->CR |= RTC_CR_WUTE;
}
else {
rtcp->id_rtc->CR &= ~RTC_CR_WUTIE;
rtcp->id_rtc->CR &= ~RTC_CR_WUTE;
}
}
/**
* @brief Gets time of periodic wakeup.
*
* @note Default value after BKP domain reset is 0x0000FFFF
*
* @param[in] rtcp pointer to RTC driver structure
* @param[out] wakeupspec pointer to a @p RTCWakeup structure
*
* @api
*/
void rtcGetPeriodicWakeup_v2(RTCDriver *rtcp, RTCWakeup *wakeupspec){
wakeupspec->wakeup = 0;
wakeupspec->wakeup |= rtcp->id_rtc->WUTR;
wakeupspec->wakeup |= (((uint32_t)rtcp->id_rtc->CR) & 0x7) << 16;
}
#endif /* HAL_USE_RTC */
/** @} */
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