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Superseded
This library was superseded by mbed-dev - https://os.mbed.com/users/mbed_official/code/mbed-dev/.
Development branch of the mbed library sources. This library is kept in synch with the latest changes from the mbed SDK and it is not guaranteed to work.
If you are looking for a stable and tested release, please import one of the official mbed library releases:
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targets/hal/TARGET_STM/TARGET_NUCLEO_F401RE/rtc_api.c
- Committer:
- mbed_official
- Date:
- 2014-11-07
- Revision:
- 393:17d2d502961d
- Parent:
- 285:31249416b6f9
- Child:
- 402:09075a3b15e3
File content as of revision 393:17d2d502961d:
/* mbed Microcontroller Library ******************************************************************************* * Copyright (c) 2014, 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" #if DEVICE_RTC #include "mbed_error.h" static int rtc_inited = 0; static RTC_HandleTypeDef RtcHandle; void rtc_init(void) { RCC_OscInitTypeDef RCC_OscInitStruct; uint32_t rtc_freq = 0; if (rtc_inited) return; rtc_inited = 1; RtcHandle.Instance = RTC; // 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 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_CLKPRESCALER(RCC_RTCCLKSOURCE_LSE); __HAL_RCC_RTC_CONFIG(RCC_RTCCLKSOURCE_LSE); rtc_freq = LSE_VALUE; } else { // 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_CLKPRESCALER(RCC_RTCCLKSOURCE_LSI); __HAL_RCC_RTC_CONFIG(RCC_RTCCLKSOURCE_LSI); // [TODO] This value is LSI typical value. To be measured precisely using a timer input capture rtc_freq = 32000; } // Enable RTC __HAL_RCC_RTC_ENABLE(); RtcHandle.Init.HourFormat = RTC_HOURFORMAT_24; RtcHandle.Init.AsynchPrediv = 127; RtcHandle.Init.SynchPrediv = (rtc_freq / 128) - 1; 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."); } } void rtc_free(void) { // 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(); // 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); rtc_inited = 0; } int rtc_isenabled(void) { return rtc_inited; } /* 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 + 100; timeinfo.tm_hour = timeStruct.Hours; timeinfo.tm_min = timeStruct.Minutes; timeinfo.tm_sec = timeStruct.Seconds; // 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 - 100; timeStruct.Hours = timeinfo->tm_hour; timeStruct.Minutes = timeinfo->tm_min; timeStruct.Seconds = timeinfo->tm_sec; timeStruct.TimeFormat = RTC_HOURFORMAT12_PM; 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); } #endif