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Superseded

This library was superseded by mbed-dev - https://os.mbed.com/users/mbed_official/code/mbed-dev/.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:

Import librarymbed

The official Mbed 2 C/C++ SDK provides the software platform and libraries to build your applications.

Last commit 20 Feb 2019 by mbed official

targets/hal/TARGET_STM/TARGET_STM32F3/rtc_api.c@621:9c82b0f79f3d, 2015-09-11 (annotated)

Committer:
mbed_official
Date:
Fri Sep 11 09:30:09 2015 +0100
Revision:
621:9c82b0f79f3d
Parent:
508:4f5903e025e6 
Synchronized with git revision 6c1d63e069ab9bd86de92e8296ca783681257538



Full URL: https://github.com/mbedmicro/mbed/commit/6c1d63e069ab9bd86de92e8296ca783681257538/



ignore target files not supported by the yotta module

Who changed what in which revision?

UserRevisionLine numberNew contents of line
mbed_official 125:23cc3068a9e4 1 /* mbed Microcontroller Library
mbed_official 125:23cc3068a9e4 2 *******************************************************************************
mbed_official 125:23cc3068a9e4 3 * Copyright (c) 2014, STMicroelectronics
mbed_official 125:23cc3068a9e4 4 * All rights reserved.
mbed_official 125:23cc3068a9e4 5 *
mbed_official 125:23cc3068a9e4 6 * Redistribution and use in source and binary forms, with or without
mbed_official 125:23cc3068a9e4 7 * modification, are permitted provided that the following conditions are met:
mbed_official 125:23cc3068a9e4 8 *
mbed_official 125:23cc3068a9e4 9 * 1. Redistributions of source code must retain the above copyright notice,
mbed_official 125:23cc3068a9e4 10 * this list of conditions and the following disclaimer.
mbed_official 125:23cc3068a9e4 11 * 2. Redistributions in binary form must reproduce the above copyright notice,
mbed_official 125:23cc3068a9e4 12 * this list of conditions and the following disclaimer in the documentation
mbed_official 125:23cc3068a9e4 13 * and/or other materials provided with the distribution.
mbed_official 125:23cc3068a9e4 14 * 3. Neither the name of STMicroelectronics nor the names of its contributors
mbed_official 125:23cc3068a9e4 15 * may be used to endorse or promote products derived from this software
mbed_official 125:23cc3068a9e4 16 * without specific prior written permission.
mbed_official 125:23cc3068a9e4 17 *
mbed_official 125:23cc3068a9e4 18 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
mbed_official 125:23cc3068a9e4 19 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
mbed_official 125:23cc3068a9e4 20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
mbed_official 125:23cc3068a9e4 21 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
mbed_official 125:23cc3068a9e4 22 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
mbed_official 125:23cc3068a9e4 23 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
mbed_official 125:23cc3068a9e4 24 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
mbed_official 125:23cc3068a9e4 25 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
mbed_official 125:23cc3068a9e4 26 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
mbed_official 125:23cc3068a9e4 27 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
mbed_official 125:23cc3068a9e4 28 *******************************************************************************
mbed_official 125:23cc3068a9e4 29 */
mbed_official 125:23cc3068a9e4 30 #include "rtc_api.h"
mbed_official 125:23cc3068a9e4 31
mbed_official 162:937d965048d3 32 #if DEVICE_RTC
mbed_official 162:937d965048d3 33
mbed_official 330:c80ac197fa6a 34 #include "mbed_error.h"
mbed_official 170:bfbcaf535cca 35
mbed_official 125:23cc3068a9e4 36 static int rtc_inited = 0;
mbed_official 125:23cc3068a9e4 37
mbed_official 330:c80ac197fa6a 38 static RTC_HandleTypeDef RtcHandle;
mbed_official 330:c80ac197fa6a 39
mbed_official 330:c80ac197fa6a 40 void rtc_init(void)
mbed_official 330:c80ac197fa6a 41 {
mbed_official 330:c80ac197fa6a 42 RCC_OscInitTypeDef RCC_OscInitStruct;
mbed_official 170:bfbcaf535cca 43 uint32_t rtc_freq = 0;
mbed_official 170:bfbcaf535cca 44
mbed_official 330:c80ac197fa6a 45 if (rtc_inited) return;
mbed_official 330:c80ac197fa6a 46 rtc_inited = 1;
mbed_official 125:23cc3068a9e4 47
mbed_official 330:c80ac197fa6a 48 RtcHandle.Instance = RTC;
mbed_official 125:23cc3068a9e4 49
mbed_official 330:c80ac197fa6a 50 // Enable Power clock
mbed_official 330:c80ac197fa6a 51 __PWR_CLK_ENABLE();
mbed_official 216:577900467c9e 52
mbed_official 330:c80ac197fa6a 53 // Enable access to Backup domain
mbed_official 330:c80ac197fa6a 54 HAL_PWR_EnableBkUpAccess();
mbed_official 330:c80ac197fa6a 55
mbed_official 330:c80ac197fa6a 56 // Reset Backup domain
mbed_official 330:c80ac197fa6a 57 __HAL_RCC_BACKUPRESET_FORCE();
mbed_official 330:c80ac197fa6a 58 __HAL_RCC_BACKUPRESET_RELEASE();
mbed_official 135:067cc8ba23da 59
mbed_official 330:c80ac197fa6a 60 // Enable LSE Oscillator
mbed_official 330:c80ac197fa6a 61 RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_LSE;
mbed_official 330:c80ac197fa6a 62 RCC_OscInitStruct.PLL.PLLState = RCC_PLL_NONE; /* Mandatory, otherwise the PLL is reconfigured! */
mbed_official 330:c80ac197fa6a 63 RCC_OscInitStruct.LSEState = RCC_LSE_ON; /* External 32.768 kHz clock on OSC_IN/OSC_OUT */
mbed_official 330:c80ac197fa6a 64 if (HAL_RCC_OscConfig(&RCC_OscInitStruct) == HAL_OK) {
mbed_official 330:c80ac197fa6a 65 // Connect LSE to RTC
mbed_official 330:c80ac197fa6a 66 __HAL_RCC_RTC_CONFIG(RCC_RTCCLKSOURCE_LSE);
mbed_official 330:c80ac197fa6a 67 rtc_freq = LSE_VALUE;
mbed_official 216:577900467c9e 68 } else {
mbed_official 330:c80ac197fa6a 69 // Enable LSI clock
mbed_official 330:c80ac197fa6a 70 RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_LSI | RCC_OSCILLATORTYPE_LSE;
mbed_official 330:c80ac197fa6a 71 RCC_OscInitStruct.PLL.PLLState = RCC_PLL_NONE; // Mandatory, otherwise the PLL is reconfigured!
mbed_official 330:c80ac197fa6a 72 RCC_OscInitStruct.LSEState = RCC_LSE_OFF;
mbed_official 330:c80ac197fa6a 73 RCC_OscInitStruct.LSIState = RCC_LSI_ON;
mbed_official 330:c80ac197fa6a 74 if (HAL_RCC_OscConfig(&RCC_OscInitStruct) != HAL_OK) {
mbed_official 330:c80ac197fa6a 75 error("RTC error: LSI clock initialization failed.");
mbed_official 330:c80ac197fa6a 76 }
mbed_official 330:c80ac197fa6a 77 // Connect LSI to RTC
mbed_official 330:c80ac197fa6a 78 __HAL_RCC_RTC_CONFIG(RCC_RTCCLKSOURCE_LSI);
mbed_official 330:c80ac197fa6a 79 // Note: The LSI clock can be measured precisely using a timer input capture.
mbed_official 330:c80ac197fa6a 80 rtc_freq = LSI_VALUE;
mbed_official 170:bfbcaf535cca 81 }
mbed_official 216:577900467c9e 82
mbed_official 330:c80ac197fa6a 83 // Enable RTC
mbed_official 330:c80ac197fa6a 84 __HAL_RCC_RTC_ENABLE();
mbed_official 125:23cc3068a9e4 85
mbed_official 330:c80ac197fa6a 86 RtcHandle.Init.HourFormat = RTC_HOURFORMAT_24;
mbed_official 330:c80ac197fa6a 87 RtcHandle.Init.AsynchPrediv = 127;
mbed_official 330:c80ac197fa6a 88 RtcHandle.Init.SynchPrediv = (rtc_freq / 128) - 1;
mbed_official 330:c80ac197fa6a 89 RtcHandle.Init.OutPut = RTC_OUTPUT_DISABLE;
mbed_official 330:c80ac197fa6a 90 RtcHandle.Init.OutPutPolarity = RTC_OUTPUT_POLARITY_HIGH;
mbed_official 330:c80ac197fa6a 91 RtcHandle.Init.OutPutType = RTC_OUTPUT_TYPE_OPENDRAIN;
mbed_official 216:577900467c9e 92
mbed_official 330:c80ac197fa6a 93 if (HAL_RTC_Init(&RtcHandle) != HAL_OK) {
mbed_official 330:c80ac197fa6a 94 error("RTC error: RTC initialization failed.");
mbed_official 330:c80ac197fa6a 95 }
mbed_official 125:23cc3068a9e4 96 }
mbed_official 125:23cc3068a9e4 97
mbed_official 330:c80ac197fa6a 98 void rtc_free(void)
mbed_official 330:c80ac197fa6a 99 {
mbed_official 330:c80ac197fa6a 100 // Enable Power clock
mbed_official 330:c80ac197fa6a 101 __PWR_CLK_ENABLE();
mbed_official 330:c80ac197fa6a 102
mbed_official 330:c80ac197fa6a 103 // Enable access to Backup domain
mbed_official 330:c80ac197fa6a 104 HAL_PWR_EnableBkUpAccess();
mbed_official 330:c80ac197fa6a 105
mbed_official 330:c80ac197fa6a 106 // Reset Backup domain
mbed_official 330:c80ac197fa6a 107 __HAL_RCC_BACKUPRESET_FORCE();
mbed_official 330:c80ac197fa6a 108 __HAL_RCC_BACKUPRESET_RELEASE();
mbed_official 330:c80ac197fa6a 109
mbed_official 330:c80ac197fa6a 110 // Disable access to Backup domain
mbed_official 330:c80ac197fa6a 111 HAL_PWR_DisableBkUpAccess();
mbed_official 330:c80ac197fa6a 112
mbed_official 330:c80ac197fa6a 113 // Disable LSI and LSE clocks
mbed_official 330:c80ac197fa6a 114 RCC_OscInitTypeDef RCC_OscInitStruct;
mbed_official 330:c80ac197fa6a 115 RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_LSI | RCC_OSCILLATORTYPE_LSE;
mbed_official 330:c80ac197fa6a 116 RCC_OscInitStruct.PLL.PLLState = RCC_PLL_NONE;
mbed_official 330:c80ac197fa6a 117 RCC_OscInitStruct.LSIState = RCC_LSI_OFF;
mbed_official 330:c80ac197fa6a 118 RCC_OscInitStruct.LSEState = RCC_LSE_OFF;
mbed_official 330:c80ac197fa6a 119 HAL_RCC_OscConfig(&RCC_OscInitStruct);
mbed_official 216:577900467c9e 120
mbed_official 125:23cc3068a9e4 121 rtc_inited = 0;
mbed_official 125:23cc3068a9e4 122 }
mbed_official 125:23cc3068a9e4 123
mbed_official 330:c80ac197fa6a 124 int rtc_isenabled(void)
mbed_official 330:c80ac197fa6a 125 {
mbed_official 125:23cc3068a9e4 126 return rtc_inited;
mbed_official 125:23cc3068a9e4 127 }
mbed_official 125:23cc3068a9e4 128
mbed_official 125:23cc3068a9e4 129 /*
mbed_official 125:23cc3068a9e4 130 RTC Registers
mbed_official 125:23cc3068a9e4 131 RTC_WeekDay 1=monday, 2=tuesday, ..., 7=sunday
mbed_official 125:23cc3068a9e4 132 RTC_Month 1=january, 2=february, ..., 12=december
mbed_official 125:23cc3068a9e4 133 RTC_Date day of the month 1-31
mbed_official 125:23cc3068a9e4 134 RTC_Year year 0-99
mbed_official 125:23cc3068a9e4 135 struct tm
mbed_official 125:23cc3068a9e4 136 tm_sec seconds after the minute 0-61
mbed_official 125:23cc3068a9e4 137 tm_min minutes after the hour 0-59
mbed_official 125:23cc3068a9e4 138 tm_hour hours since midnight 0-23
mbed_official 125:23cc3068a9e4 139 tm_mday day of the month 1-31
mbed_official 125:23cc3068a9e4 140 tm_mon months since January 0-11
mbed_official 125:23cc3068a9e4 141 tm_year years since 1900
mbed_official 125:23cc3068a9e4 142 tm_wday days since Sunday 0-6
mbed_official 125:23cc3068a9e4 143 tm_yday days since January 1 0-365
mbed_official 125:23cc3068a9e4 144 tm_isdst Daylight Saving Time flag
mbed_official 125:23cc3068a9e4 145 */
mbed_official 330:c80ac197fa6a 146 time_t rtc_read(void)
mbed_official 330:c80ac197fa6a 147 {
mbed_official 125:23cc3068a9e4 148 RTC_DateTypeDef dateStruct;
mbed_official 125:23cc3068a9e4 149 RTC_TimeTypeDef timeStruct;
mbed_official 125:23cc3068a9e4 150 struct tm timeinfo;
mbed_official 135:067cc8ba23da 151
mbed_official 330:c80ac197fa6a 152 RtcHandle.Instance = RTC;
mbed_official 330:c80ac197fa6a 153
mbed_official 125:23cc3068a9e4 154 // Read actual date and time
mbed_official 330:c80ac197fa6a 155 // Warning: the time must be read first!
mbed_official 330:c80ac197fa6a 156 HAL_RTC_GetTime(&RtcHandle, &timeStruct, FORMAT_BIN);
mbed_official 330:c80ac197fa6a 157 HAL_RTC_GetDate(&RtcHandle, &dateStruct, FORMAT_BIN);
mbed_official 135:067cc8ba23da 158
mbed_official 125:23cc3068a9e4 159 // Setup a tm structure based on the RTC
mbed_official 330:c80ac197fa6a 160 timeinfo.tm_wday = dateStruct.WeekDay;
mbed_official 330:c80ac197fa6a 161 timeinfo.tm_mon = dateStruct.Month - 1;
mbed_official 330:c80ac197fa6a 162 timeinfo.tm_mday = dateStruct.Date;
mbed_official 330:c80ac197fa6a 163 timeinfo.tm_year = dateStruct.Year + 100;
mbed_official 330:c80ac197fa6a 164 timeinfo.tm_hour = timeStruct.Hours;
mbed_official 330:c80ac197fa6a 165 timeinfo.tm_min = timeStruct.Minutes;
mbed_official 330:c80ac197fa6a 166 timeinfo.tm_sec = timeStruct.Seconds;
mbed_official 135:067cc8ba23da 167
mbed_official 125:23cc3068a9e4 168 // Convert to timestamp
mbed_official 125:23cc3068a9e4 169 time_t t = mktime(&timeinfo);
mbed_official 135:067cc8ba23da 170
mbed_official 135:067cc8ba23da 171 return t;
mbed_official 125:23cc3068a9e4 172 }
mbed_official 125:23cc3068a9e4 173
mbed_official 330:c80ac197fa6a 174 void rtc_write(time_t t)
mbed_official 330:c80ac197fa6a 175 {
mbed_official 125:23cc3068a9e4 176 RTC_DateTypeDef dateStruct;
mbed_official 125:23cc3068a9e4 177 RTC_TimeTypeDef timeStruct;
mbed_official 125:23cc3068a9e4 178
mbed_official 330:c80ac197fa6a 179 RtcHandle.Instance = RTC;
mbed_official 330:c80ac197fa6a 180
mbed_official 125:23cc3068a9e4 181 // Convert the time into a tm
mbed_official 125:23cc3068a9e4 182 struct tm *timeinfo = localtime(&t);
mbed_official 135:067cc8ba23da 183
mbed_official 125:23cc3068a9e4 184 // Fill RTC structures
mbed_official 330:c80ac197fa6a 185 dateStruct.WeekDay = timeinfo->tm_wday;
mbed_official 330:c80ac197fa6a 186 dateStruct.Month = timeinfo->tm_mon + 1;
mbed_official 330:c80ac197fa6a 187 dateStruct.Date = timeinfo->tm_mday;
mbed_official 330:c80ac197fa6a 188 dateStruct.Year = timeinfo->tm_year - 100;
mbed_official 330:c80ac197fa6a 189 timeStruct.Hours = timeinfo->tm_hour;
mbed_official 330:c80ac197fa6a 190 timeStruct.Minutes = timeinfo->tm_min;
mbed_official 330:c80ac197fa6a 191 timeStruct.Seconds = timeinfo->tm_sec;
mbed_official 330:c80ac197fa6a 192 timeStruct.TimeFormat = RTC_HOURFORMAT12_PM;
mbed_official 330:c80ac197fa6a 193 timeStruct.DayLightSaving = RTC_DAYLIGHTSAVING_NONE;
mbed_official 330:c80ac197fa6a 194 timeStruct.StoreOperation = RTC_STOREOPERATION_RESET;
mbed_official 135:067cc8ba23da 195
mbed_official 125:23cc3068a9e4 196 // Change the RTC current date/time
mbed_official 330:c80ac197fa6a 197 HAL_RTC_SetDate(&RtcHandle, &dateStruct, FORMAT_BIN);
mbed_official 330:c80ac197fa6a 198 HAL_RTC_SetTime(&RtcHandle, &timeStruct, FORMAT_BIN);
mbed_official 125:23cc3068a9e4 199 }
mbed_official 162:937d965048d3 200
mbed_official 162:937d965048d3 201 #endif