mbed library sources. Supersedes mbed-src.
Fork of mbed-dev by
targets/TARGET_STM/TARGET_STM32F1/rtc_api.c
- Committer:
- <>
- Date:
- 2016-10-28
- Revision:
- 149:156823d33999
File content as of revision 149:156823d33999:
/* 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; if (rtc_inited) return; rtc_inited = 1; 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 RCC_OscInitStruct.LSIState = RCC_LSI_OFF; if (HAL_RCC_OscConfig(&RCC_OscInitStruct) == HAL_OK) { // Check if LSE has started correctly // Connect LSE to RTC __HAL_RCC_RTC_CONFIG(RCC_RTCCLKSOURCE_LSE); } else { error("Cannot initialize RTC with LSE\n"); } #else // Enable Power clock __HAL_RCC_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("Cannot initialize RTC with LSI\n"); } // Connect LSI to RTC __HAL_RCC_RTC_CONFIG(RCC_RTCCLKSOURCE_LSI); // This value is LSI typical value. To be measured precisely using a timer input capture for example. #endif // Enable RTC __HAL_RCC_RTC_ENABLE(); RtcHandle.Init.AsynchPrediv = RTC_AUTO_1_SECOND; if (HAL_RTC_Init(&RtcHandle) != HAL_OK) { error("RTC error: RTC initialization failed."); } } 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); 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; 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; timeStruct.Hours = timeinfo->tm_hour; timeStruct.Minutes = timeinfo->tm_min; timeStruct.Seconds = timeinfo->tm_sec; // Change the RTC current date/time HAL_RTC_SetDate(&RtcHandle, &dateStruct, FORMAT_BIN); HAL_RTC_SetTime(&RtcHandle, &timeStruct, FORMAT_BIN); } #endif