RTC. Setting and getting time works on STM32F4x
git-svn-id: svn://svn.code.sf.net/p/chibios/svn/branches/rtc_dev@3596 35acf78f-673a-0410-8e92-d51de3d6d3f4
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@ -320,6 +320,7 @@
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/* RTC attributes.*/
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#define STM32_HAS_RTC TRUE
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#define RTC_HAS_SUBSECONDS TRUE
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/* SDIO attributes.*/
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#define STM32_HAS_SDIO TRUE
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@ -31,6 +31,24 @@
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#if HAL_USE_RTC || defined(__DOXYGEN__)
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/*===========================================================================*/
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/* Notes. */
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/*===========================================================================*/
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/*
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This structure is used to hold the values representing a calendar time.
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It contains the following members, with the meanings as shown.
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int tm_sec // seconds after minute [0-61] (61 allows for 2 leap-seconds)
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int tm_min // minutes after hour [0-59]
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int tm_hour // hours after midnight [0-23]
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int tm_mday // day of the month [1-31]
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int tm_mon // month of year [0-11]
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int tm_year // current year-1900
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int tm_wday // days since Sunday [0-6]
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int tm_yday // days since January 1st [0-365]
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int tm_isdst // daylight savings indicator (1 = yes, 0 = no, -1 = unknown)
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*/
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/*===========================================================================*/
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/* Driver exported variables. */
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/*===========================================================================*/
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@ -65,7 +83,11 @@ RTCDriver RTCD1;
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* @notapi
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*/
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void rtc_lld_init(void){
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uint32_t preload;
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/* Asynchronous part of preloader. Set it to maximum value. */
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#define PREDIV_A ((uint32_t)0x7F)
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/* Add async part to preload value. */
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uint32_t preload = PREDIV_A << 16;
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/* Enables access to BKP registers.*/
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PWR->CR |= PWR_CR_DBP;
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@ -77,35 +99,35 @@ void rtc_lld_init(void){
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}
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#if STM32_RTC == STM32_RTC_LSE
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#define RTC_CLK STM32_LSECLK
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if (!(RCC->BDCR & RCC_BDCR_LSEON)) {
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RCC->BDCR |= RCC_BDCR_LSEON;
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while (!(RCC->BDCR & RCC_BDCR_LSERDY))
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;
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}
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preload = STM32_LSECLK - 1;
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#elif STM32_RTC == STM32_RTC_LSI
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#define RTC_CLK STM32_LSICLK
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/* TODO: Move the LSI clock initialization in the HAL low level driver.*/
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RCC->CSR |= RCC_CSR_LSION;
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while (!(RCC->CSR & RCC_CSR_LSIRDY))
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;
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/* According to errata sheet we must wait additional 100 uS for
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stabilization.
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TODO: Change this code, software loops are not reliable.*/
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uint32_t tmo = (STM32_SYSCLK / 1000000) * 100;
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while (tmo--)
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;
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preload = STM32_LSICLK - 1;
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#elif STM32_RTC == STM32_RTC_HSE
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preload = (STM32_HSICLK / 128) - 1;
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#define RTC_CLK (STM32_HSICLK / 31)
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#endif
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/* Add sync part to preload value. */
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preload |= ((RTC_CLK / (PREDIV_A + 1)) - 1) & 0x7FFF;
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/* Selects clock source (previously enabled and stabilized).*/
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RCC->BDCR = (RCC->BDCR & ~RCC_BDCR_RTCSEL) | STM32_RTC;
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/* RTC enabled regardless its previous status.*/
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RCC->BDCR |= RCC_BDCR_RTCEN;
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if (!(RTC->ISR & RTC_ISR_INITS)){/* Calendar not init yet. */
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/* If calendar not init yet. */
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if (!(RTC->ISR & RTC_ISR_INITS)){
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/* Disable write protection on RTC registers. */
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RTC->WPR = 0xCA;
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RTC->WPR = 0x53;
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@ -115,13 +137,9 @@ void rtc_lld_init(void){
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while(!(RTC->ISR & RTC_ISR_INITF))
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;
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/* Prescaler registers must be written in by two separate writes. */
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RTC->PRER = 0x007F00FF;
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RTC->PRER = 0x007F00FF;
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RTC->PRER = preload;
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RTC->PRER = preload;
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RTC->ISR &= ~RTC_ISR_INIT;
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/* Wait until calendar data will updated. */
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while(!(RTC->ISR & RTC_ISR_RSF))
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;
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}
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/* Callback initially disabled.*/
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@ -147,10 +165,6 @@ void rtc_lld_set_time(RTCDriver *rtcp, const RTCTime *timespec) {
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RTC->TR = timespec->tv_time;
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RTC->DR = timespec->tv_date;
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RTC->ISR &= ~RTC_ISR_INIT;
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/* Wait until calendar data will updated. */
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while(!(RTC->ISR & RTC_ISR_RSF))
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;
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}
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/**
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@ -173,8 +187,14 @@ void rtc_lld_get_time(RTCDriver *rtcp, RTCTime *timespec) {
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timespec->tv_time = RTC->TR;
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timespec->tv_date = RTC->DR;
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#if RTC_HAS_SUBSECONDS
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timespec->tv_msec = ((RTC->PRER & 0x7FFF) - RTC->SSR) / ((RTC->PRER & 0x7FFF) + 1);
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#else
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timespec->tv_msec = 0;
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#endif /* STM32_RTC_HAS_SUBSECONDS */
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}
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/**
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* @brief Set alarm time.
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*
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@ -189,7 +209,6 @@ void rtc_lld_get_time(RTCDriver *rtcp, RTCTime *timespec) {
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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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(void)alarmspec;
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@ -41,7 +41,7 @@
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#define RTC_SUPPORTS_CALLBACKS TRUE
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/**
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* @brief One alarm comparator available.
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* @brief Two alarm comparators available on STM32F4x.
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*/
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#define RTC_ALARMS 2
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@ -62,6 +62,10 @@
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#error "invalid source selected for RTC clock"
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#endif
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#if RTC_SUPPORTS_CALLBACKS && !(HAL_USE_EXT)
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#error "interrupts from STM32 RTC works only through EXTI"
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#endif
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/*===========================================================================*/
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/* Driver data structures and types. */
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/*===========================================================================*/
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@ -97,13 +101,18 @@ typedef void (*rtccb_t)(RTCDriver *rtcp, rtcevent_t event);
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*/
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struct RTCTime {
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/**
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* @brief RTC date register in BCD format.
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* @brief RTC date register in STM32 BCD format.
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*/
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uint32_t tv_date;
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/**
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* @brief RTC time register in BCD format.
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* @brief RTC time register in STM32 BCD format.
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*/
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uint32_t tv_time;
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/**
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* @brief Fractional part of time.
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* @note If platform does not support subseconds than always zero.
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*/
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uint16_t tv_msec;
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};
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@ -112,7 +121,7 @@ struct RTCTime {
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*/
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struct RTCAlarm {
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/**
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* @brief Date and time of alarm in BCD.
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* @brief Date and time of alarm in STM32 BCD.
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*/
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uint32_t tv_datetime;
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};
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@ -24,7 +24,7 @@
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RTCTime timespec;
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RTCAlarm alarmspec;
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#define TEST_ALARM_WAKEUP FALSE
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#define TEST_ALARM_WAKEUP TRUE
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#if TEST_ALARM_WAKEUP
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chThdCreateStatic(blinkWA, sizeof(blinkWA), NORMALPRIO, blink_thd, NULL);
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/* set alarm in near future */
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rtcGetTime(×pec);
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rtcGetTime(&RTCD1, ×pec);
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alarmspec.tv_sec = timespec.tv_sec + 60;
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rtcSetAlarm(&alarmspec);
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rtcSetAlarm(&RTCD1, 0, &alarmspec);
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while (TRUE){
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chThdSleepSeconds(10);
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