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This library was superseded by mbed-dev - https://os.mbed.com/users/mbed_official/code/mbed-dev/.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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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_STM32F0/rtc_api.c@630:825f75ca301e, 2015-09-28 (annotated)

Committer:
mbed_official
Date:
Mon Sep 28 10:45:10 2015 +0100
Revision:
630:825f75ca301e
Parent:
469:fc4922e0c183 
Synchronized with git revision 54fbe4144faf309c37205a5d39fa665daa919f10



Full URL: https://github.com/mbedmicro/mbed/commit/54fbe4144faf309c37205a5d39fa665daa919f10/



NUCLEO_F031K6 : Add new target

Who changed what in which revision?

UserRevisionLine numberNew contents of line
mbed_official 441:d2c15dda23c1 1 /* mbed Microcontroller Library
mbed_official 441:d2c15dda23c1 2 *******************************************************************************
mbed_official 630:825f75ca301e 3 * Copyright (c) 2015, STMicroelectronics
mbed_official 441:d2c15dda23c1 4 * All rights reserved.
mbed_official 441:d2c15dda23c1 5 *
mbed_official 441:d2c15dda23c1 6 * Redistribution and use in source and binary forms, with or without
mbed_official 441:d2c15dda23c1 7 * modification, are permitted provided that the following conditions are met:
mbed_official 441:d2c15dda23c1 8 *
mbed_official 441:d2c15dda23c1 9 * 1. Redistributions of source code must retain the above copyright notice,
mbed_official 441:d2c15dda23c1 10 * this list of conditions and the following disclaimer.
mbed_official 441:d2c15dda23c1 11 * 2. Redistributions in binary form must reproduce the above copyright notice,
mbed_official 441:d2c15dda23c1 12 * this list of conditions and the following disclaimer in the documentation
mbed_official 441:d2c15dda23c1 13 * and/or other materials provided with the distribution.
mbed_official 441:d2c15dda23c1 14 * 3. Neither the name of STMicroelectronics nor the names of its contributors
mbed_official 441:d2c15dda23c1 15 * may be used to endorse or promote products derived from this software
mbed_official 441:d2c15dda23c1 16 * without specific prior written permission.
mbed_official 441:d2c15dda23c1 17 *
mbed_official 441:d2c15dda23c1 18 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
mbed_official 441:d2c15dda23c1 19 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
mbed_official 441:d2c15dda23c1 20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
mbed_official 441:d2c15dda23c1 21 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
mbed_official 441:d2c15dda23c1 22 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
mbed_official 441:d2c15dda23c1 23 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
mbed_official 441:d2c15dda23c1 24 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
mbed_official 441:d2c15dda23c1 25 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
mbed_official 441:d2c15dda23c1 26 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
mbed_official 441:d2c15dda23c1 27 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
mbed_official 441:d2c15dda23c1 28 *******************************************************************************
mbed_official 441:d2c15dda23c1 29 */
mbed_official 441:d2c15dda23c1 30 #include "rtc_api.h"
mbed_official 441:d2c15dda23c1 31
mbed_official 441:d2c15dda23c1 32 #if DEVICE_RTC
mbed_official 441:d2c15dda23c1 33
mbed_official 441:d2c15dda23c1 34 #include "mbed_error.h"
mbed_official 441:d2c15dda23c1 35
mbed_official 441:d2c15dda23c1 36 static int rtc_inited = 0;
mbed_official 441:d2c15dda23c1 37
mbed_official 441:d2c15dda23c1 38 static RTC_HandleTypeDef RtcHandle;
mbed_official 441:d2c15dda23c1 39
mbed_official 630:825f75ca301e 40 void rtc_init(void) {
mbed_official 441:d2c15dda23c1 41 RCC_OscInitTypeDef RCC_OscInitStruct;
mbed_official 441:d2c15dda23c1 42 uint32_t rtc_freq = 0;
mbed_official 441:d2c15dda23c1 43
mbed_official 441:d2c15dda23c1 44 if (rtc_inited) return;
mbed_official 441:d2c15dda23c1 45 rtc_inited = 1;
mbed_official 441:d2c15dda23c1 46
mbed_official 441:d2c15dda23c1 47 RtcHandle.Instance = RTC;
mbed_official 441:d2c15dda23c1 48
mbed_official 441:d2c15dda23c1 49 // Enable Power clock
mbed_official 441:d2c15dda23c1 50 __PWR_CLK_ENABLE();
mbed_official 441:d2c15dda23c1 51
mbed_official 441:d2c15dda23c1 52 // Enable access to Backup domain
mbed_official 441:d2c15dda23c1 53 HAL_PWR_EnableBkUpAccess();
mbed_official 441:d2c15dda23c1 54
mbed_official 441:d2c15dda23c1 55 // Reset Backup domain
mbed_official 441:d2c15dda23c1 56 __HAL_RCC_BACKUPRESET_FORCE();
mbed_official 441:d2c15dda23c1 57 __HAL_RCC_BACKUPRESET_RELEASE();
mbed_official 441:d2c15dda23c1 58
mbed_official 441:d2c15dda23c1 59 // Enable LSE Oscillator
mbed_official 441:d2c15dda23c1 60 RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_LSE;
mbed_official 441:d2c15dda23c1 61 RCC_OscInitStruct.PLL.PLLState = RCC_PLL_NONE; // Mandatory, otherwise the PLL is reconfigured!
mbed_official 441:d2c15dda23c1 62 RCC_OscInitStruct.LSEState = RCC_LSE_ON; // External 32.768 kHz clock on OSC_IN/OSC_OUT
mbed_official 441:d2c15dda23c1 63 if (HAL_RCC_OscConfig(&RCC_OscInitStruct) == HAL_OK) {
mbed_official 441:d2c15dda23c1 64 // Connect LSE to RTC
mbed_official 441:d2c15dda23c1 65 __HAL_RCC_RTC_CONFIG(RCC_RTCCLKSOURCE_LSE);
mbed_official 441:d2c15dda23c1 66 rtc_freq = LSE_VALUE;
mbed_official 441:d2c15dda23c1 67 } else {
mbed_official 441:d2c15dda23c1 68 // Enable LSI clock
mbed_official 441:d2c15dda23c1 69 RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_LSI | RCC_OSCILLATORTYPE_LSE;
mbed_official 441:d2c15dda23c1 70 RCC_OscInitStruct.PLL.PLLState = RCC_PLL_NONE; // Mandatory, otherwise the PLL is reconfigured!
mbed_official 441:d2c15dda23c1 71 RCC_OscInitStruct.LSEState = RCC_LSE_OFF;
mbed_official 441:d2c15dda23c1 72 RCC_OscInitStruct.LSIState = RCC_LSI_ON;
mbed_official 441:d2c15dda23c1 73 if (HAL_RCC_OscConfig(&RCC_OscInitStruct) != HAL_OK) {
mbed_official 441:d2c15dda23c1 74 error("RTC error: LSI clock initialization failed.");
mbed_official 441:d2c15dda23c1 75 }
mbed_official 441:d2c15dda23c1 76 // Connect LSI to RTC
mbed_official 441:d2c15dda23c1 77 __HAL_RCC_RTC_CONFIG(RCC_RTCCLKSOURCE_LSI);
mbed_official 441:d2c15dda23c1 78 // This value is LSI typical value. To be measured precisely using a timer input capture for example.
mbed_official 441:d2c15dda23c1 79 rtc_freq = LSI_VALUE;
mbed_official 441:d2c15dda23c1 80 }
mbed_official 441:d2c15dda23c1 81
mbed_official 441:d2c15dda23c1 82 // Enable RTC
mbed_official 441:d2c15dda23c1 83 __HAL_RCC_RTC_ENABLE();
mbed_official 441:d2c15dda23c1 84
mbed_official 441:d2c15dda23c1 85 RtcHandle.Init.HourFormat = RTC_HOURFORMAT_24;
mbed_official 441:d2c15dda23c1 86 RtcHandle.Init.AsynchPrediv = 127;
mbed_official 441:d2c15dda23c1 87 RtcHandle.Init.SynchPrediv = (rtc_freq / 128) - 1;
mbed_official 441:d2c15dda23c1 88 RtcHandle.Init.OutPut = RTC_OUTPUT_DISABLE;
mbed_official 441:d2c15dda23c1 89 RtcHandle.Init.OutPutPolarity = RTC_OUTPUT_POLARITY_HIGH;
mbed_official 441:d2c15dda23c1 90 RtcHandle.Init.OutPutType = RTC_OUTPUT_TYPE_OPENDRAIN;
mbed_official 441:d2c15dda23c1 91
mbed_official 441:d2c15dda23c1 92 if (HAL_RTC_Init(&RtcHandle) != HAL_OK) {
mbed_official 441:d2c15dda23c1 93 error("RTC error: RTC initialization failed.");
mbed_official 441:d2c15dda23c1 94 }
mbed_official 441:d2c15dda23c1 95 }
mbed_official 441:d2c15dda23c1 96
mbed_official 630:825f75ca301e 97 void rtc_free(void) {
mbed_official 441:d2c15dda23c1 98 // Enable Power clock
mbed_official 441:d2c15dda23c1 99 __PWR_CLK_ENABLE();
mbed_official 441:d2c15dda23c1 100
mbed_official 441:d2c15dda23c1 101 // Enable access to Backup domain
mbed_official 441:d2c15dda23c1 102 HAL_PWR_EnableBkUpAccess();
mbed_official 441:d2c15dda23c1 103
mbed_official 441:d2c15dda23c1 104 // Reset Backup domain
mbed_official 441:d2c15dda23c1 105 __HAL_RCC_BACKUPRESET_FORCE();
mbed_official 441:d2c15dda23c1 106 __HAL_RCC_BACKUPRESET_RELEASE();
mbed_official 441:d2c15dda23c1 107
mbed_official 441:d2c15dda23c1 108 // Disable access to Backup domain
mbed_official 441:d2c15dda23c1 109 HAL_PWR_DisableBkUpAccess();
mbed_official 441:d2c15dda23c1 110
mbed_official 441:d2c15dda23c1 111 // Disable LSI and LSE clocks
mbed_official 441:d2c15dda23c1 112 RCC_OscInitTypeDef RCC_OscInitStruct;
mbed_official 441:d2c15dda23c1 113 RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_LSI | RCC_OSCILLATORTYPE_LSE;
mbed_official 441:d2c15dda23c1 114 RCC_OscInitStruct.PLL.PLLState = RCC_PLL_NONE;
mbed_official 441:d2c15dda23c1 115 RCC_OscInitStruct.LSIState = RCC_LSI_OFF;
mbed_official 441:d2c15dda23c1 116 RCC_OscInitStruct.LSEState = RCC_LSE_OFF;
mbed_official 441:d2c15dda23c1 117 HAL_RCC_OscConfig(&RCC_OscInitStruct);
mbed_official 441:d2c15dda23c1 118
mbed_official 441:d2c15dda23c1 119 rtc_inited = 0;
mbed_official 441:d2c15dda23c1 120 }
mbed_official 441:d2c15dda23c1 121
mbed_official 630:825f75ca301e 122 int rtc_isenabled(void) {
mbed_official 441:d2c15dda23c1 123 return rtc_inited;
mbed_official 441:d2c15dda23c1 124 }
mbed_official 441:d2c15dda23c1 125
mbed_official 441:d2c15dda23c1 126 /*
mbed_official 441:d2c15dda23c1 127 RTC Registers
mbed_official 441:d2c15dda23c1 128 RTC_WeekDay 1=monday, 2=tuesday, ..., 7=sunday
mbed_official 441:d2c15dda23c1 129 RTC_Month 1=january, 2=february, ..., 12=december
mbed_official 441:d2c15dda23c1 130 RTC_Date day of the month 1-31
mbed_official 441:d2c15dda23c1 131 RTC_Year year 0-99
mbed_official 441:d2c15dda23c1 132 struct tm
mbed_official 441:d2c15dda23c1 133 tm_sec seconds after the minute 0-61
mbed_official 441:d2c15dda23c1 134 tm_min minutes after the hour 0-59
mbed_official 441:d2c15dda23c1 135 tm_hour hours since midnight 0-23
mbed_official 441:d2c15dda23c1 136 tm_mday day of the month 1-31
mbed_official 441:d2c15dda23c1 137 tm_mon months since January 0-11
mbed_official 441:d2c15dda23c1 138 tm_year years since 1900
mbed_official 441:d2c15dda23c1 139 tm_wday days since Sunday 0-6
mbed_official 441:d2c15dda23c1 140 tm_yday days since January 1 0-365
mbed_official 441:d2c15dda23c1 141 tm_isdst Daylight Saving Time flag
mbed_official 441:d2c15dda23c1 142 */
mbed_official 630:825f75ca301e 143 time_t rtc_read(void) {
mbed_official 441:d2c15dda23c1 144 RTC_DateTypeDef dateStruct;
mbed_official 441:d2c15dda23c1 145 RTC_TimeTypeDef timeStruct;
mbed_official 441:d2c15dda23c1 146 struct tm timeinfo;
mbed_official 441:d2c15dda23c1 147
mbed_official 441:d2c15dda23c1 148 RtcHandle.Instance = RTC;
mbed_official 441:d2c15dda23c1 149
mbed_official 441:d2c15dda23c1 150 // Read actual date and time
mbed_official 441:d2c15dda23c1 151 // Warning: the time must be read first!
mbed_official 441:d2c15dda23c1 152 HAL_RTC_GetTime(&RtcHandle, &timeStruct, FORMAT_BIN);
mbed_official 441:d2c15dda23c1 153 HAL_RTC_GetDate(&RtcHandle, &dateStruct, FORMAT_BIN);
mbed_official 441:d2c15dda23c1 154
mbed_official 441:d2c15dda23c1 155 // Setup a tm structure based on the RTC
mbed_official 441:d2c15dda23c1 156 timeinfo.tm_wday = dateStruct.WeekDay;
mbed_official 441:d2c15dda23c1 157 timeinfo.tm_mon = dateStruct.Month - 1;
mbed_official 441:d2c15dda23c1 158 timeinfo.tm_mday = dateStruct.Date;
mbed_official 441:d2c15dda23c1 159 timeinfo.tm_year = dateStruct.Year + 100;
mbed_official 441:d2c15dda23c1 160 timeinfo.tm_hour = timeStruct.Hours;
mbed_official 441:d2c15dda23c1 161 timeinfo.tm_min = timeStruct.Minutes;
mbed_official 441:d2c15dda23c1 162 timeinfo.tm_sec = timeStruct.Seconds;
mbed_official 441:d2c15dda23c1 163
mbed_official 441:d2c15dda23c1 164 // Convert to timestamp
mbed_official 441:d2c15dda23c1 165 time_t t = mktime(&timeinfo);
mbed_official 441:d2c15dda23c1 166
mbed_official 441:d2c15dda23c1 167 return t;
mbed_official 441:d2c15dda23c1 168 }
mbed_official 441:d2c15dda23c1 169
mbed_official 630:825f75ca301e 170 void rtc_write(time_t t) {
mbed_official 441:d2c15dda23c1 171 RTC_DateTypeDef dateStruct;
mbed_official 441:d2c15dda23c1 172 RTC_TimeTypeDef timeStruct;
mbed_official 441:d2c15dda23c1 173
mbed_official 441:d2c15dda23c1 174 RtcHandle.Instance = RTC;
mbed_official 441:d2c15dda23c1 175
mbed_official 441:d2c15dda23c1 176 // Convert the time into a tm
mbed_official 441:d2c15dda23c1 177 struct tm *timeinfo = localtime(&t);
mbed_official 441:d2c15dda23c1 178
mbed_official 441:d2c15dda23c1 179 // Fill RTC structures
mbed_official 441:d2c15dda23c1 180 dateStruct.WeekDay = timeinfo->tm_wday;
mbed_official 441:d2c15dda23c1 181 dateStruct.Month = timeinfo->tm_mon + 1;
mbed_official 441:d2c15dda23c1 182 dateStruct.Date = timeinfo->tm_mday;
mbed_official 441:d2c15dda23c1 183 dateStruct.Year = timeinfo->tm_year - 100;
mbed_official 441:d2c15dda23c1 184 timeStruct.Hours = timeinfo->tm_hour;
mbed_official 441:d2c15dda23c1 185 timeStruct.Minutes = timeinfo->tm_min;
mbed_official 441:d2c15dda23c1 186 timeStruct.Seconds = timeinfo->tm_sec;
mbed_official 441:d2c15dda23c1 187 timeStruct.TimeFormat = RTC_HOURFORMAT12_PM;
mbed_official 441:d2c15dda23c1 188 timeStruct.DayLightSaving = RTC_DAYLIGHTSAVING_NONE;
mbed_official 441:d2c15dda23c1 189 timeStruct.StoreOperation = RTC_STOREOPERATION_RESET;
mbed_official 441:d2c15dda23c1 190
mbed_official 441:d2c15dda23c1 191 // Change the RTC current date/time
mbed_official 441:d2c15dda23c1 192 HAL_RTC_SetDate(&RtcHandle, &dateStruct, FORMAT_BIN);
mbed_official 441:d2c15dda23c1 193 HAL_RTC_SetTime(&RtcHandle, &timeStruct, FORMAT_BIN);
mbed_official 441:d2c15dda23c1 194 }
mbed_official 441:d2c15dda23c1 195
mbed_official 441:d2c15dda23c1 196 #endif