330 lines
9.5 KiB
C
330 lines
9.5 KiB
C
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/*
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ChibiOS/RT - Copyright (C) 2006-2013 Giovanni Di Sirio
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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/*
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Concepts and parts of this file have been contributed by Uladzimir Pylinsky
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aka barthess.
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*/
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/**
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* @file STM32/RTCv1/rtc_lld.c
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* @brief STM32 RTC subsystem low level driver header.
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*
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* @addtogroup RTC
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* @{
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*/
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#include "ch.h"
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#include "hal.h"
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#if HAL_USE_RTC || defined(__DOXYGEN__)
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/*===========================================================================*/
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/* Driver local definitions. */
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/*===========================================================================*/
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/*===========================================================================*/
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/* Driver exported variables. */
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/*===========================================================================*/
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/**
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* @brief RTC driver identifier.
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*/
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RTCDriver RTCD1;
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/*===========================================================================*/
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/* Driver local variables and types. */
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/*===========================================================================*/
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/*===========================================================================*/
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/* Driver local functions. */
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/*===========================================================================*/
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/**
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* @brief Wait for synchronization of RTC registers with APB1 bus.
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* @details This function must be invoked before trying to read RTC registers
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* in the backup domain: DIV, CNT, ALR. CR registers can always
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* be read.
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*
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* @notapi
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*/
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#define rtc_lld_apb1_sync() {while ((RTC->CRL & RTC_CRL_RSF) == 0);}
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/**
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* @brief Wait for for previous write operation complete.
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* @details This function must be invoked before writing to any RTC registers
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*
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* @notapi
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*/
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#define rtc_lld_wait_write() {while ((RTC->CRL & RTC_CRL_RTOFF) == 0);}
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/**
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* @brief Acquires write access to RTC registers.
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* @details Before writing to the backup domain RTC registers the previous
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* write operation must be completed. Use this function before
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* writing to PRL, CNT, ALR registers.
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*
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* @notapi
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*/
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#define rtc_lld_acquire() {rtc_lld_wait_write(); RTC->CRL |= RTC_CRL_CNF;}
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/**
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* @brief Releases write access to RTC registers.
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*
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* @notapi
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*/
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#define rtc_lld_release() {RTC->CRL &= ~RTC_CRL_CNF;}
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/*===========================================================================*/
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/* Driver interrupt handlers. */
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/*===========================================================================*/
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/**
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* @brief RTC interrupt handler.
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*
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* @isr
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*/
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CH_IRQ_HANDLER(RTC_IRQHandler) {
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uint16_t flags;
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CH_IRQ_PROLOGUE();
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/* This wait works only when AHB1 bus was previously powered off by any
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reason (standby, reset, etc). In other cases it does nothing.*/
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rtc_lld_apb1_sync();
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/* Mask of all enabled and pending sources.*/
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flags = RTC->CRH & RTC->CRL;
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RTC->CRL &= ~(RTC_CRL_SECF | RTC_CRL_ALRF | RTC_CRL_OWF);
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if (flags & RTC_CRL_SECF)
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RTCD1.callback(&RTCD1, RTC_EVENT_SECOND);
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if (flags & RTC_CRL_ALRF)
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RTCD1.callback(&RTCD1, RTC_EVENT_ALARM);
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if (flags & RTC_CRL_OWF)
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RTCD1.callback(&RTCD1, RTC_EVENT_OVERFLOW);
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CH_IRQ_EPILOGUE();
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}
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/*===========================================================================*/
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/* Driver exported functions. */
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/*===========================================================================*/
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/**
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* @brief Load value of RTCCLK to prescaler registers.
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* @note The pre-scaler must not be set on every reset as RTC clock
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* counts are lost when it is set.
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* @note This function designed to be called from
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* hal_lld_backup_domain_init(). Because there is only place
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* where possible to detect BKP domain reset event reliably.
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*
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* @notapi
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*/
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void rtc_lld_set_prescaler(void){
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rtc_lld_acquire();
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RTC->PRLH = (uint16_t)((STM32_RTCCLK - 1) >> 16) & 0x000F;
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RTC->PRLL = (uint16_t)(((STM32_RTCCLK - 1)) & 0xFFFF);
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rtc_lld_release();
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}
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/**
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* @brief Initialize RTC.
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*
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* @notapi
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*/
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void rtc_lld_init(void){
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/* RSF bit must be cleared by software after an APB1 reset or an APB1 clock
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stop. Otherwise its value will not be actual. */
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RTC->CRL &= ~RTC_CRL_RSF;
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/* Required because access to PRL.*/
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rtc_lld_apb1_sync();
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/* All interrupts initially disabled.*/
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rtc_lld_wait_write();
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RTC->CRH = 0;
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/* Callback initially disabled.*/
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RTCD1.callback = NULL;
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/* IRQ vector permanently assigned to this driver.*/
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nvicEnableVector(RTC_IRQn, CORTEX_PRIORITY_MASK(STM32_RTC_IRQ_PRIORITY));
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}
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/**
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* @brief Set current time.
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* @note Fractional part will be silently ignored. There is no possibility
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* to change it on STM32F1xx platform.
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*
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* @param[in] rtcp pointer to RTC driver structure
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* @param[in] timespec pointer to a @p RTCTime structure
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*
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* @notapi
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*/
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void rtc_lld_set_time(RTCDriver *rtcp, const RTCTime *timespec) {
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(void)rtcp;
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rtc_lld_acquire();
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RTC->CNTH = (uint16_t)(timespec->tv_sec >> 16);
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RTC->CNTL = (uint16_t)(timespec->tv_sec & 0xFFFF);
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rtc_lld_release();
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}
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/**
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* @brief Get current time.
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*
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* @param[in] rtcp pointer to RTC driver structure
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* @param[in] timespec pointer to a @p RTCTime structure
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*
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* @notapi
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*/
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void rtc_lld_get_time(RTCDriver *rtcp, RTCTime *timespec) {
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(void)rtcp;
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uint32_t time_frac;
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/* Required because access to CNT and DIV.*/
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rtc_lld_apb1_sync();
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/* Loops until two consecutive read returning the same value.*/
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do {
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timespec->tv_sec = ((uint32_t)(RTC->CNTH) << 16) + RTC->CNTL;
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time_frac = (((uint32_t)RTC->DIVH) << 16) + (uint32_t)RTC->DIVL;
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} while ((timespec->tv_sec) != (((uint32_t)(RTC->CNTH) << 16) + RTC->CNTL));
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timespec->tv_msec = (uint16_t)(((STM32_RTCCLK - 1 - time_frac) * 1000) /
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STM32_RTCCLK);
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}
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/**
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* @brief Set alarm time.
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*
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* @note Default value after BKP domain reset is 0xFFFFFFFF
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*
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* @param[in] rtcp pointer to RTC driver structure
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* @param[in] alarm alarm identifier
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* @param[in] alarmspec pointer to a @p RTCAlarm structure
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*
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* @notapi
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*/
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void rtc_lld_set_alarm(RTCDriver *rtcp,
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rtcalarm_t alarm,
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const RTCAlarm *alarmspec) {
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(void)rtcp;
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(void)alarm;
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rtc_lld_acquire();
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if (alarmspec != NULL) {
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RTC->ALRH = (uint16_t)(alarmspec->tv_sec >> 16);
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RTC->ALRL = (uint16_t)(alarmspec->tv_sec & 0xFFFF);
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}
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else {
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RTC->ALRH = 0;
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RTC->ALRL = 0;
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}
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rtc_lld_release();
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}
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/**
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* @brief Get current alarm.
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* @note If an alarm has not been set then the returned alarm specification
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* is not meaningful.
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*
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* @note Default value after BKP domain reset is 0xFFFFFFFF.
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*
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* @param[in] rtcp pointer to RTC driver structure
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* @param[in] alarm alarm identifier
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* @param[out] alarmspec pointer to a @p RTCAlarm structure
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*
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* @notapi
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*/
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void rtc_lld_get_alarm(RTCDriver *rtcp,
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rtcalarm_t alarm,
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RTCAlarm *alarmspec) {
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(void)rtcp;
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(void)alarm;
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/* Required because access to ALR.*/
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rtc_lld_apb1_sync();
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alarmspec->tv_sec = ((RTC->ALRH << 16) + RTC->ALRL);
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}
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/**
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* @brief Enables or disables RTC callbacks.
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* @details This function enables or disables callbacks, use a @p NULL pointer
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* in order to disable a callback.
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*
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* @param[in] rtcp pointer to RTC driver structure
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* @param[in] callback callback function pointer or @p NULL
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*
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* @notapi
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*/
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void rtc_lld_set_callback(RTCDriver *rtcp, rtccb_t callback) {
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if (callback != NULL) {
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/* IRQ sources enabled only after setting up the callback.*/
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rtcp->callback = callback;
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rtc_lld_wait_write();
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RTC->CRL &= ~(RTC_CRL_OWF | RTC_CRL_ALRF | RTC_CRL_SECF);
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RTC->CRH = RTC_CRH_OWIE | RTC_CRH_ALRIE | RTC_CRH_SECIE;
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}
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else {
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rtc_lld_wait_write();
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RTC->CRH = 0;
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/* Callback set to NULL only after disabling the IRQ sources.*/
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rtcp->callback = NULL;
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}
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}
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#include "chrtclib.h"
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/**
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* @brief Get current time in format suitable for usage in FatFS.
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*
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* @param[in] rtcp pointer to RTC driver structure
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* @return FAT time value.
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*
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* @api
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*/
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uint32_t rtc_lld_get_time_fat(RTCDriver *rtcp) {
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uint32_t fattime;
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struct tm timp;
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rtcGetTimeTm(rtcp, &timp);
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fattime = (timp.tm_sec) >> 1;
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fattime |= (timp.tm_min) << 5;
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fattime |= (timp.tm_hour) << 11;
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fattime |= (timp.tm_mday) << 16;
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fattime |= (timp.tm_mon + 1) << 21;
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fattime |= (timp.tm_year - 80) << 25;
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return fattime;
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}
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#endif /* HAL_USE_RTC */
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/** @} */
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