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tinySA/os/hal/ports/STM32/LLD/RTCv2/rtc_lld.c

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/*
ChibiOS/HAL - Copyright (C) 2006-2014 Giovanni Di Sirio
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/
/*
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 "hal.h"
#if HAL_USE_RTC || defined(__DOXYGEN__)
/*===========================================================================*/
/* Driver local definitions. */
/*===========================================================================*/
#define RTC_TR_PM_OFFSET 22
#define RTC_TR_HT_OFFSET 20
#define RTC_TR_HU_OFFSET 16
#define RTC_TR_MNT_OFFSET 12
#define RTC_TR_MNU_OFFSET 8
#define RTC_TR_ST_OFFSET 4
#define RTC_TR_SU_OFFSET 0
#define RTC_DR_YT_OFFSET 20
#define RTC_DR_YU_OFFSET 16
#define RTC_DR_WDU_OFFSET 13
#define RTC_DR_MT_OFFSET 12
#define RTC_DR_MU_OFFSET 8
#define RTC_DR_DT_OFFSET 4
#define RTC_DR_DU_OFFSET 0
/*===========================================================================*/
/* Driver exported variables. */
/*===========================================================================*/
/**
* @brief RTC driver identifier.
*/
RTCDriver RTCD1;
/*===========================================================================*/
/* Driver local variables and types. */
/*===========================================================================*/
/*===========================================================================*/
/* Driver local functions. */
/*===========================================================================*/
/**
* @brief Wait for synchronization of RTC registers with shadow registers.
* @details This function must be invoked before trying to access RTC
* registers.
*
* @notapi
*/
static void rtc_regs_sync(void) {
while ((RTCD1.rtc->ISR & RTC_ISR_RSF) == 0)
;
}
/**
* @brief Beginning of configuration procedure.
*
* @notapi
*/
static void rtc_enter_init(void) {
RTCD1.rtc->ISR |= RTC_ISR_INIT;
while ((RTCD1.rtc->ISR & RTC_ISR_INITF) == 0)
;
}
/**
* @brief Finalizing of configuration procedure.
*
* @notapi
*/
static inline void rtc_exit_init(void) {
RTCD1.rtc->ISR &= ~RTC_ISR_INIT;
}
/**
* @brief Converts time from TR register encoding to timespec.
*
* @param[in] tr TR register value
* @param[out] timespec pointer to a @p RTCDateTime structure
*
* @notapi
*/
static void rtc_decode_time(uint32_t tr, RTCDateTime *timespec) {
uint32_t n;
n = ((tr >> RTC_TR_HT_OFFSET) & 3) * 36000000;
n += ((tr >> RTC_TR_HU_OFFSET) & 15) * 3600000;
n += ((tr >> RTC_TR_MNT_OFFSET) & 7) * 600000;
n += ((tr >> RTC_TR_MNU_OFFSET) & 15) * 60000;
n += ((tr >> RTC_TR_ST_OFFSET) & 7) * 10000;
n += ((tr >> RTC_TR_SU_OFFSET) & 15) * 1000;
timespec->millisecond = n;
}
/**
* @brief Converts date from DR register encoding to timespec.
*
* @param[in] dr DR register value
* @param[out] timespec pointer to a @p RTCDateTime structure
*
* @notapi
*/
static void rtc_decode_date(uint32_t dr, RTCDateTime *timespec) {
timespec->year = (((dr >> RTC_DR_YT_OFFSET) & 15) * 10) +
((dr >> RTC_DR_YU_OFFSET) & 15);
timespec->month = (((dr >> RTC_TR_MNT_OFFSET) & 1) * 10) +
((dr >> RTC_TR_MNU_OFFSET) & 15);
timespec->day = (((dr >> RTC_DR_DT_OFFSET) & 3) * 10) +
((dr >> RTC_DR_DU_OFFSET) & 15);
timespec->dayofweek = (dr >> RTC_DR_WDU_OFFSET) & 1;
}
/**
* @brief Converts time from timespec to TR register encoding.
*
* @param[in] timespec pointer to a @p RTCDateTime structure
* @return the TR register encoding.
*
* @notapi
*/
static uint32_t rtc_encode_time(const RTCDateTime *timespec) {
uint32_t n, tr = 0;
/* Subseconds cannot be set.*/
n = timespec->millisecond / 1000;
/* Seconds conversion.*/
tr = tr | ((n % 10) << RTC_TR_SU_OFFSET);
n /= 10;
tr = tr | ((n % 6) << RTC_TR_ST_OFFSET);
n /= 6;
/* Minutes conversion.*/
tr = tr | ((n % 10) << RTC_TR_MNU_OFFSET);
n /= 10;
tr = tr | ((n % 6) << RTC_TR_MNT_OFFSET);
n /= 6;
/* Hours conversion.*/
tr = tr | ((n % 10) << RTC_TR_HU_OFFSET);
n /= 10;
tr = tr | (n << RTC_TR_HT_OFFSET);
return tr;
}
/**
* @brief Converts a date from timespec to DR register encoding.
*
* @param[in] timespec pointer to a @p RTCDateTime structure
* @return the DR register encoding.
*
* @notapi
*/
static uint32_t rtc_encode_date(const RTCDateTime *timespec) {
uint32_t n, dr = 0;
/* Year conversion. Note, only years last two digits are considered.*/
n = timespec->year;
dr = dr | ((n % 10) << RTC_DR_YU_OFFSET);
n /= 10;
dr = dr | ((n % 10) << RTC_DR_YT_OFFSET);
/* Months conversion.*/
n = timespec->month;
dr = dr | ((n % 10) << RTC_DR_MU_OFFSET);
n /= 10;
dr = dr | ((n % 10) << RTC_DR_MT_OFFSET);
/* Days conversion.*/
n = timespec->day;
dr = dr | ((n % 10) << RTC_DR_DU_OFFSET);
n /= 10;
dr = dr | ((n % 10) << RTC_DR_DT_OFFSET);
/* Days of week conversion.*/
dr = dr | (timespec->dayofweek << RTC_DR_WDU_OFFSET);
return dr;
}
/*===========================================================================*/
/* Driver interrupt handlers. */
/*===========================================================================*/
/*===========================================================================*/
/* Driver exported functions. */
/*===========================================================================*/
/**
* @brief Enable access to registers.
*
* @api
*/
void rtc_lld_init(void) {
/* RTC pointer initialization.*/
RTCD1.rtc = RTC;
/* Disable write protection. */
RTCD1.rtc->WPR = 0xCA;
RTCD1.rtc->WPR = 0x53;
/* If calendar has not been initialized yet then proceed with the
initial setup.*/
if (!(RTCD1.rtc->ISR & RTC_ISR_INITS)) {
rtc_enter_init();
RTCD1.rtc->CR = 0;
RTCD1.rtc->ISR = 0;
RTCD1.rtc->PRER = STM32_RTC_PRER_BITS;
RTCD1.rtc->PRER = STM32_RTC_PRER_BITS;
rtc_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 RTCDateTime structure
*
* @api
*/
void rtc_lld_set_time(RTCDriver *rtcp, const RTCDateTime *timespec) {
uint32_t dr, tr;
tr = rtc_encode_time(timespec);
dr = rtc_encode_date(timespec);
rtc_regs_sync();
rtc_enter_init();
rtcp->rtc->TR = tr;
rtcp->rtc->DR = dr;
rtc_exit_init();
}
/**
* @brief Get current time.
*
* @param[in] rtcp pointer to RTC driver structure
* @param[out] timespec pointer to a @p RTCDateTime structure
*
* @api
*/
void rtc_lld_get_time(RTCDriver *rtcp, RTCDateTime *timespec) {
uint32_t subs;
rtc_regs_sync();
/* Decoding day time, this starts the atomic read sequence, see "Reading
the calendar" in the RTC documentation.*/
rtc_decode_time(rtcp->rtc->TR, timespec);
/* If the RTC is capable of sub-second counting then the value is
normalized in milliseconds and added to the time.*/
#if STM32_RTC_HAS_SUBSECONDS
subs = (((rtcp->rtc->SSR << 16) / STM32_RTC_PRESS_VALUE) * 1000) >> 16;
#else
subs = 0;
#endif /* STM32_RTC_HAS_SUBSECONDS */
timespec->millisecond += subs;
/* Decoding date, this concludes the atomic read sequence.*/
rtc_decode_date(rtcp->rtc->DR, timespec);
}
#if (STM32_RTC_NUM_ALARMS > 0) || defined(__DOXYGEN__)
/**
* @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->rtc->CR &= ~RTC_CR_ALRAE;
while (!(rtcp->rtc->ISR & RTC_ISR_ALRAWF))
;
rtcp->rtc->ALRMAR = alarmspec->alrmr;
rtcp->rtc->CR |= RTC_CR_ALRAE;
rtcp->rtc->CR |= RTC_CR_ALRAIE;
}
else {
rtcp->rtc->CR &= ~RTC_CR_ALRAIE;
rtcp->rtc->CR &= ~RTC_CR_ALRAE;
}
}
#if STM32_RTC_NUM_ALARMS > 1
else {
if (alarmspec != NULL) {
rtcp->rtc->CR &= ~RTC_CR_ALRBE;
while (!(rtcp->rtc->ISR & RTC_ISR_ALRBWF))
;
rtcp->rtc->ALRMBR = alarmspec->alrmr;
rtcp->rtc->CR |= RTC_CR_ALRBE;
rtcp->rtc->CR |= RTC_CR_ALRBIE;
}
else {
rtcp->rtc->CR &= ~RTC_CR_ALRBIE;
rtcp->rtc->CR &= ~RTC_CR_ALRBE;
}
}
#endif /* STM32_RTC_NUM_ALARMS > 1 */
}
/**
* @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->alrmr = rtcp->rtc->ALRMAR;
#if STM32_RTC_NUM_ALARMS > 1
else
alarmspec->alrmr = rtcp->rtc->ALRMBR;
#endif /* STM32_RTC_NUM_ALARMS > 1 */
}
#endif /* STM32_RTC_NUM_ALARMS > 0 */
#if STM32_RTC_HAS_PERIODIC_WAKEUPS || defined(__DOXYGEN__)
/**
* @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 rtcSTM32SetPeriodicWakeup(RTCDriver *rtcp, const RTCWakeup *wakeupspec) {
if (wakeupspec != NULL) {
osalDbgCheck(wakeupspec->wutr != 0x30000);
rtcp->rtc->CR &= ~RTC_CR_WUTE;
while (!(rtcp->rtc->ISR & RTC_ISR_WUTWF))
;
rtcp->rtc->WUTR = wakeupspec->wutr & 0xFFFF;
rtcp->rtc->CR = (wakeupspec->wutr >> 16) & 0x7;
rtcp->rtc->CR |= RTC_CR_WUTIE;
rtcp->rtc->CR |= RTC_CR_WUTE;
}
else {
rtcp->rtc->CR &= ~RTC_CR_WUTIE;
rtcp->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 rtcSTM32GetPeriodicWakeup(RTCDriver *rtcp, RTCWakeup *wakeupspec) {
wakeupspec->wutr = 0;
wakeupspec->wutr |= rtcp->rtc->WUTR;
wakeupspec->wutr |= (((uint32_t)rtcp->rtc->CR) & 0x7) << 16;
}
#endif /* STM32_RTC_HAS_PERIODIC_WAKEUPS */
#endif /* HAL_USE_RTC */
/** @} */
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