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Diff: targets/TARGET_STM/TARGET_STM32F3/rtc_api.c
- Revision:
- 149:156823d33999
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/targets/TARGET_STM/TARGET_STM32F3/rtc_api.c Fri Oct 28 11:17:30 2016 +0100 @@ -0,0 +1,296 @@ +/* mbed Microcontroller Library + ******************************************************************************* + * Copyright (c) 2016, STMicroelectronics + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions are met: + * + * 1. Redistributions of source code must retain the above copyright notice, + * this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright notice, + * this list of conditions and the following disclaimer in the documentation + * and/or other materials provided with the distribution. + * 3. Neither the name of STMicroelectronics nor the names of its contributors + * may be used to endorse or promote products derived from this software + * without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" + * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE + * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE + * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL + * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR + * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER + * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, + * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE + * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + ******************************************************************************* + */ +#include "rtc_api.h" +#include "rtc_api_hal.h" + +#if DEVICE_RTC + +#include "mbed_error.h" + +#if RTC_LSI + static int rtc_inited = 0; +#endif + +static RTC_HandleTypeDef RtcHandle; + +#if RTC_LSI + #define RTC_CLOCK LSI_VALUE +#else + #define RTC_CLOCK LSE_VALUE +#endif + +#if DEVICE_LOWPOWERTIMER + #define RTC_ASYNCH_PREDIV ((RTC_CLOCK - 1) / 0x8000) + #define RTC_SYNCH_PREDIV (RTC_CLOCK / (RTC_ASYNCH_PREDIV + 1) - 1) +#else + #define RTC_ASYNCH_PREDIV (0x007F) + #define RTC_SYNCH_PREDIV (RTC_CLOCK / (RTC_ASYNCH_PREDIV + 1) - 1) +#endif + +#if DEVICE_LOWPOWERTIMER + static void (*irq_handler)(void); + static void RTC_IRQHandler(); +#endif + +void rtc_init(void) +{ + RCC_OscInitTypeDef RCC_OscInitStruct; + +#if RTC_LSI + if (rtc_inited) return; + rtc_inited = 1; +#endif + + RtcHandle.Instance = RTC; + +#if !RTC_LSI + // Enable LSE Oscillator + RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_LSE; + RCC_OscInitStruct.PLL.PLLState = RCC_PLL_NONE; /* Mandatory, otherwise the PLL is reconfigured! */ + RCC_OscInitStruct.LSEState = RCC_LSE_ON; /* External 32.768 kHz clock on OSC_IN/OSC_OUT */ + if (HAL_RCC_OscConfig(&RCC_OscInitStruct) == HAL_OK) { + // Connect LSE to RTC + __HAL_RCC_RTC_CONFIG(RCC_RTCCLKSOURCE_LSE); + } else { + error("RTC error: LSE clock initialization failed."); + } +#else + // Enable Power clock + __PWR_CLK_ENABLE(); + + // Enable access to Backup domain + HAL_PWR_EnableBkUpAccess(); + + // Reset Backup domain + __HAL_RCC_BACKUPRESET_FORCE(); + __HAL_RCC_BACKUPRESET_RELEASE(); + + // Enable LSI clock + RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_LSI | RCC_OSCILLATORTYPE_LSE; + RCC_OscInitStruct.PLL.PLLState = RCC_PLL_NONE; // Mandatory, otherwise the PLL is reconfigured! + RCC_OscInitStruct.LSEState = RCC_LSE_OFF; + RCC_OscInitStruct.LSIState = RCC_LSI_ON; + if (HAL_RCC_OscConfig(&RCC_OscInitStruct) != HAL_OK) { + error("RTC error: LSI clock initialization failed."); + } + // Connect LSI to RTC + __HAL_RCC_RTC_CONFIG(RCC_RTCCLKSOURCE_LSI); +#endif + + // Enable RTC + __HAL_RCC_RTC_ENABLE(); + + RtcHandle.Init.HourFormat = RTC_HOURFORMAT_24; + RtcHandle.Init.AsynchPrediv = RTC_ASYNCH_PREDIV; + RtcHandle.Init.SynchPrediv = RTC_SYNCH_PREDIV; + RtcHandle.Init.OutPut = RTC_OUTPUT_DISABLE; + RtcHandle.Init.OutPutPolarity = RTC_OUTPUT_POLARITY_HIGH; + RtcHandle.Init.OutPutType = RTC_OUTPUT_TYPE_OPENDRAIN; + + if (HAL_RTC_Init(&RtcHandle) != HAL_OK) { + error("RTC error: RTC initialization failed."); + } + +#if DEVICE_LOWPOWERTIMER +#if RTC_LSI + rtc_write(0); +#else + if (!rtc_isenabled()) { + rtc_write(0); + } +#endif + NVIC_ClearPendingIRQ(RTC_WKUP_IRQn); + NVIC_DisableIRQ(RTC_WKUP_IRQn); + NVIC_SetVector(RTC_WKUP_IRQn, (uint32_t)RTC_IRQHandler); + NVIC_EnableIRQ(RTC_WKUP_IRQn); +#endif +} + +void rtc_free(void) +{ +#if RTC_LSI + // Enable Power clock + __PWR_CLK_ENABLE(); + + // Enable access to Backup domain + HAL_PWR_EnableBkUpAccess(); + + // Reset Backup domain + __HAL_RCC_BACKUPRESET_FORCE(); + __HAL_RCC_BACKUPRESET_RELEASE(); + + // Disable access to Backup domain + HAL_PWR_DisableBkUpAccess(); +#endif + + // Disable LSI and LSE clocks + RCC_OscInitTypeDef RCC_OscInitStruct; + RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_LSI | RCC_OSCILLATORTYPE_LSE; + RCC_OscInitStruct.PLL.PLLState = RCC_PLL_NONE; + RCC_OscInitStruct.LSIState = RCC_LSI_OFF; + RCC_OscInitStruct.LSEState = RCC_LSE_OFF; + HAL_RCC_OscConfig(&RCC_OscInitStruct); + +#if RTC_LSI + rtc_inited = 0; +#endif +} + +int rtc_isenabled(void) +{ +#if RTC_LSI + return rtc_inited; +#else + if ((RTC->ISR & RTC_ISR_INITS) == RTC_ISR_INITS) return 1; + else return 0; +#endif +} + +/* + RTC Registers + RTC_WeekDay 1=monday, 2=tuesday, ..., 7=sunday + RTC_Month 1=january, 2=february, ..., 12=december + RTC_Date day of the month 1-31 + RTC_Year year 0-99 + struct tm + tm_sec seconds after the minute 0-61 + tm_min minutes after the hour 0-59 + tm_hour hours since midnight 0-23 + tm_mday day of the month 1-31 + tm_mon months since January 0-11 + tm_year years since 1900 + tm_wday days since Sunday 0-6 + tm_yday days since January 1 0-365 + tm_isdst Daylight Saving Time flag +*/ +time_t rtc_read(void) +{ + RTC_DateTypeDef dateStruct; + RTC_TimeTypeDef timeStruct; + struct tm timeinfo; + + RtcHandle.Instance = RTC; + + // Read actual date and time + // Warning: the time must be read first! + HAL_RTC_GetTime(&RtcHandle, &timeStruct, FORMAT_BIN); + HAL_RTC_GetDate(&RtcHandle, &dateStruct, FORMAT_BIN); + + // Setup a tm structure based on the RTC + timeinfo.tm_wday = dateStruct.WeekDay; + timeinfo.tm_mon = dateStruct.Month - 1; + timeinfo.tm_mday = dateStruct.Date; + timeinfo.tm_year = dateStruct.Year + 68; + timeinfo.tm_hour = timeStruct.Hours; + timeinfo.tm_min = timeStruct.Minutes; + timeinfo.tm_sec = timeStruct.Seconds; + // Daylight Saving Time information is not available + timeinfo.tm_isdst = -1; + + // Convert to timestamp + time_t t = mktime(&timeinfo); + + return t; +} + +void rtc_write(time_t t) +{ + RTC_DateTypeDef dateStruct; + RTC_TimeTypeDef timeStruct; + + RtcHandle.Instance = RTC; + + // Convert the time into a tm + struct tm *timeinfo = localtime(&t); + + // Fill RTC structures + dateStruct.WeekDay = timeinfo->tm_wday; + dateStruct.Month = timeinfo->tm_mon + 1; + dateStruct.Date = timeinfo->tm_mday; + dateStruct.Year = timeinfo->tm_year - 68; + timeStruct.Hours = timeinfo->tm_hour; + timeStruct.Minutes = timeinfo->tm_min; + timeStruct.Seconds = timeinfo->tm_sec; + timeStruct.TimeFormat = RTC_HOURFORMAT_24; + timeStruct.DayLightSaving = RTC_DAYLIGHTSAVING_NONE; + timeStruct.StoreOperation = RTC_STOREOPERATION_RESET; + + // Change the RTC current date/time + HAL_RTC_SetDate(&RtcHandle, &dateStruct, FORMAT_BIN); + HAL_RTC_SetTime(&RtcHandle, &timeStruct, FORMAT_BIN); +} + +#if DEVICE_LOWPOWERTIMER + +static void RTC_IRQHandler() +{ + HAL_RTCEx_WakeUpTimerIRQHandler(&RtcHandle); +} + +void HAL_RTCEx_WakeUpTimerEventCallback(RTC_HandleTypeDef *hrtc) +{ + if (irq_handler) { + // Fire the user callback + irq_handler(); + } +} + +void rtc_set_irq_handler(uint32_t handler) +{ + irq_handler = (void (*)(void))handler; +} + +uint32_t rtc_read_subseconds(void) +{ + return 1000000.f * ((double)(RTC_SYNCH_PREDIV - RTC->SSR) / (RTC_SYNCH_PREDIV + 1)); +} + +void rtc_set_wake_up_timer(uint32_t delta) +{ + uint32_t wake_up_counter = delta / (2000000 / RTC_CLOCK); + + if (HAL_RTCEx_SetWakeUpTimer_IT(&RtcHandle, wake_up_counter, + RTC_WAKEUPCLOCK_RTCCLK_DIV2) != HAL_OK) { + error("Set wake up timer failed\n"); + } +} + +void rtc_deactivate_wake_up_timer(void) +{ + HAL_RTCEx_DeactivateWakeUpTimer(&RtcHandle); +} + +void rtc_synchronize(void) +{ + HAL_RTC_WaitForSynchro(&RtcHandle); +} +#endif // DEVICE_LOWPOWERTIMER + +#endif