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mbed library sources

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Superseded

This library was superseded by mbed-dev - https://os.mbed.com/users/mbed_official/code/mbed-dev/.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_STM32F4/rtc_api.c@635:a11c0372f0ba, 2015-09-30 (annotated)

Committer:
mbed_official
Date:
Wed Sep 30 17:00:09 2015 +0100
Revision:
635:a11c0372f0ba
Parent:
442:d916d321e60f 
Synchronized with git revision d29c98dae61be0946ddf3a3c641c7726056f9452



Full URL: https://github.com/mbedmicro/mbed/commit/d29c98dae61be0946ddf3a3c641c7726056f9452/



Added support for SAMW25

Who changed what in which revision?

UserRevisionLine numberNew contents of line
mbed_official 235:685d5f11838f 1 /* mbed Microcontroller Library
mbed_official 235:685d5f11838f 2 *******************************************************************************
mbed_official 235:685d5f11838f 3 * Copyright (c) 2014, STMicroelectronics
mbed_official 235:685d5f11838f 4 * All rights reserved.
mbed_official 235:685d5f11838f 5 *
mbed_official 235:685d5f11838f 6 * Redistribution and use in source and binary forms, with or without
mbed_official 235:685d5f11838f 7 * modification, are permitted provided that the following conditions are met:
mbed_official 235:685d5f11838f 8 *
mbed_official 235:685d5f11838f 9 * 1. Redistributions of source code must retain the above copyright notice,
mbed_official 235:685d5f11838f 10 * this list of conditions and the following disclaimer.
mbed_official 235:685d5f11838f 11 * 2. Redistributions in binary form must reproduce the above copyright notice,
mbed_official 235:685d5f11838f 12 * this list of conditions and the following disclaimer in the documentation
mbed_official 235:685d5f11838f 13 * and/or other materials provided with the distribution.
mbed_official 235:685d5f11838f 14 * 3. Neither the name of STMicroelectronics nor the names of its contributors
mbed_official 235:685d5f11838f 15 * may be used to endorse or promote products derived from this software
mbed_official 235:685d5f11838f 16 * without specific prior written permission.
mbed_official 235:685d5f11838f 17 *
mbed_official 235:685d5f11838f 18 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
mbed_official 235:685d5f11838f 19 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
mbed_official 235:685d5f11838f 20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
mbed_official 235:685d5f11838f 21 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
mbed_official 235:685d5f11838f 22 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
mbed_official 235:685d5f11838f 23 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
mbed_official 235:685d5f11838f 24 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
mbed_official 235:685d5f11838f 25 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
mbed_official 235:685d5f11838f 26 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
mbed_official 235:685d5f11838f 27 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
mbed_official 235:685d5f11838f 28 *******************************************************************************
mbed_official 235:685d5f11838f 29 */
mbed_official 235:685d5f11838f 30 #include "rtc_api.h"
mbed_official 235:685d5f11838f 31
mbed_official 235:685d5f11838f 32 #if DEVICE_RTC
mbed_official 235:685d5f11838f 33
mbed_official 285:31249416b6f9 34 #include "mbed_error.h"
mbed_official 235:685d5f11838f 35
mbed_official 235:685d5f11838f 36 static int rtc_inited = 0;
mbed_official 235:685d5f11838f 37
mbed_official 235:685d5f11838f 38 static RTC_HandleTypeDef RtcHandle;
mbed_official 235:685d5f11838f 39
mbed_official 235:685d5f11838f 40 void rtc_init(void)
mbed_official 235:685d5f11838f 41 {
mbed_official 235:685d5f11838f 42 RCC_OscInitTypeDef RCC_OscInitStruct;
mbed_official 235:685d5f11838f 43 uint32_t rtc_freq = 0;
mbed_official 235:685d5f11838f 44
mbed_official 235:685d5f11838f 45 if (rtc_inited) return;
mbed_official 235:685d5f11838f 46 rtc_inited = 1;
mbed_official 235:685d5f11838f 47
mbed_official 235:685d5f11838f 48 RtcHandle.Instance = RTC;
mbed_official 235:685d5f11838f 49
mbed_official 235:685d5f11838f 50 // Enable Power clock
mbed_official 235:685d5f11838f 51 __PWR_CLK_ENABLE();
mbed_official 235:685d5f11838f 52
mbed_official 235:685d5f11838f 53 // Enable access to Backup domain
mbed_official 235:685d5f11838f 54 HAL_PWR_EnableBkUpAccess();
mbed_official 235:685d5f11838f 55
mbed_official 235:685d5f11838f 56 // Reset Backup domain
mbed_official 235:685d5f11838f 57 __HAL_RCC_BACKUPRESET_FORCE();
mbed_official 235:685d5f11838f 58 __HAL_RCC_BACKUPRESET_RELEASE();
mbed_official 235:685d5f11838f 59
mbed_official 235:685d5f11838f 60 // Enable LSE Oscillator
mbed_official 235:685d5f11838f 61 RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_LSE;
mbed_official 235:685d5f11838f 62 RCC_OscInitStruct.PLL.PLLState = RCC_PLL_NONE; /* Mandatory, otherwise the PLL is reconfigured! */
mbed_official 235:685d5f11838f 63 RCC_OscInitStruct.LSEState = RCC_LSE_ON; /* External 32.768 kHz clock on OSC_IN/OSC_OUT */
mbed_official 235:685d5f11838f 64 if (HAL_RCC_OscConfig(&RCC_OscInitStruct) == HAL_OK) {
mbed_official 235:685d5f11838f 65 // Connect LSE to RTC
mbed_official 235:685d5f11838f 66 __HAL_RCC_RTC_CLKPRESCALER(RCC_RTCCLKSOURCE_LSE);
mbed_official 235:685d5f11838f 67 __HAL_RCC_RTC_CONFIG(RCC_RTCCLKSOURCE_LSE);
mbed_official 235:685d5f11838f 68 rtc_freq = LSE_VALUE;
mbed_official 235:685d5f11838f 69 } else {
mbed_official 235:685d5f11838f 70 // Enable LSI clock
mbed_official 235:685d5f11838f 71 RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_LSI | RCC_OSCILLATORTYPE_LSE;
mbed_official 235:685d5f11838f 72 RCC_OscInitStruct.PLL.PLLState = RCC_PLL_NONE; // Mandatory, otherwise the PLL is reconfigured!
mbed_official 235:685d5f11838f 73 RCC_OscInitStruct.LSEState = RCC_LSE_OFF;
mbed_official 235:685d5f11838f 74 RCC_OscInitStruct.LSIState = RCC_LSI_ON;
mbed_official 235:685d5f11838f 75 if (HAL_RCC_OscConfig(&RCC_OscInitStruct) != HAL_OK) {
mbed_official 235:685d5f11838f 76 error("RTC error: LSI clock initialization failed.");
mbed_official 235:685d5f11838f 77 }
mbed_official 235:685d5f11838f 78 // Connect LSI to RTC
mbed_official 235:685d5f11838f 79 __HAL_RCC_RTC_CLKPRESCALER(RCC_RTCCLKSOURCE_LSI);
mbed_official 235:685d5f11838f 80 __HAL_RCC_RTC_CONFIG(RCC_RTCCLKSOURCE_LSI);
mbed_official 235:685d5f11838f 81 // [TODO] This value is LSI typical value. To be measured precisely using a timer input capture
mbed_official 235:685d5f11838f 82 rtc_freq = LSI_VALUE;
mbed_official 235:685d5f11838f 83 }
mbed_official 235:685d5f11838f 84
mbed_official 235:685d5f11838f 85 // Enable RTC
mbed_official 235:685d5f11838f 86 __HAL_RCC_RTC_ENABLE();
mbed_official 235:685d5f11838f 87
mbed_official 235:685d5f11838f 88 RtcHandle.Init.HourFormat = RTC_HOURFORMAT_24;
mbed_official 235:685d5f11838f 89 RtcHandle.Init.AsynchPrediv = 127;
mbed_official 235:685d5f11838f 90 RtcHandle.Init.SynchPrediv = (rtc_freq / 128) - 1;
mbed_official 235:685d5f11838f 91 RtcHandle.Init.OutPut = RTC_OUTPUT_DISABLE;
mbed_official 235:685d5f11838f 92 RtcHandle.Init.OutPutPolarity = RTC_OUTPUT_POLARITY_HIGH;
mbed_official 235:685d5f11838f 93 RtcHandle.Init.OutPutType = RTC_OUTPUT_TYPE_OPENDRAIN;
mbed_official 235:685d5f11838f 94
mbed_official 235:685d5f11838f 95 if (HAL_RTC_Init(&RtcHandle) != HAL_OK) {
mbed_official 235:685d5f11838f 96 error("RTC error: RTC initialization failed.");
mbed_official 235:685d5f11838f 97 }
mbed_official 235:685d5f11838f 98 }
mbed_official 235:685d5f11838f 99
mbed_official 235:685d5f11838f 100 void rtc_free(void)
mbed_official 235:685d5f11838f 101 {
mbed_official 235:685d5f11838f 102 // Enable Power clock
mbed_official 235:685d5f11838f 103 __PWR_CLK_ENABLE();
mbed_official 235:685d5f11838f 104
mbed_official 235:685d5f11838f 105 // Enable access to Backup domain
mbed_official 235:685d5f11838f 106 HAL_PWR_EnableBkUpAccess();
mbed_official 235:685d5f11838f 107
mbed_official 235:685d5f11838f 108 // Reset Backup domain
mbed_official 235:685d5f11838f 109 __HAL_RCC_BACKUPRESET_FORCE();
mbed_official 235:685d5f11838f 110 __HAL_RCC_BACKUPRESET_RELEASE();
mbed_official 235:685d5f11838f 111
mbed_official 235:685d5f11838f 112 // Disable access to Backup domain
mbed_official 235:685d5f11838f 113 HAL_PWR_DisableBkUpAccess();
mbed_official 235:685d5f11838f 114
mbed_official 235:685d5f11838f 115 // Disable LSI and LSE clocks
mbed_official 235:685d5f11838f 116 RCC_OscInitTypeDef RCC_OscInitStruct;
mbed_official 235:685d5f11838f 117 RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_LSI | RCC_OSCILLATORTYPE_LSE;
mbed_official 235:685d5f11838f 118 RCC_OscInitStruct.PLL.PLLState = RCC_PLL_NONE;
mbed_official 235:685d5f11838f 119 RCC_OscInitStruct.LSIState = RCC_LSI_OFF;
mbed_official 235:685d5f11838f 120 RCC_OscInitStruct.LSEState = RCC_LSE_OFF;
mbed_official 235:685d5f11838f 121 HAL_RCC_OscConfig(&RCC_OscInitStruct);
mbed_official 235:685d5f11838f 122
mbed_official 235:685d5f11838f 123 rtc_inited = 0;
mbed_official 235:685d5f11838f 124 }
mbed_official 235:685d5f11838f 125
mbed_official 235:685d5f11838f 126 int rtc_isenabled(void)
mbed_official 235:685d5f11838f 127 {
mbed_official 235:685d5f11838f 128 return rtc_inited;
mbed_official 235:685d5f11838f 129 }
mbed_official 235:685d5f11838f 130
mbed_official 235:685d5f11838f 131 /*
mbed_official 235:685d5f11838f 132 RTC Registers
mbed_official 235:685d5f11838f 133 RTC_WeekDay 1=monday, 2=tuesday, ..., 7=sunday
mbed_official 235:685d5f11838f 134 RTC_Month 1=january, 2=february, ..., 12=december
mbed_official 235:685d5f11838f 135 RTC_Date day of the month 1-31
mbed_official 235:685d5f11838f 136 RTC_Year year 0-99
mbed_official 235:685d5f11838f 137 struct tm
mbed_official 235:685d5f11838f 138 tm_sec seconds after the minute 0-61
mbed_official 235:685d5f11838f 139 tm_min minutes after the hour 0-59
mbed_official 235:685d5f11838f 140 tm_hour hours since midnight 0-23
mbed_official 235:685d5f11838f 141 tm_mday day of the month 1-31
mbed_official 235:685d5f11838f 142 tm_mon months since January 0-11
mbed_official 235:685d5f11838f 143 tm_year years since 1900
mbed_official 235:685d5f11838f 144 tm_wday days since Sunday 0-6
mbed_official 235:685d5f11838f 145 tm_yday days since January 1 0-365
mbed_official 235:685d5f11838f 146 tm_isdst Daylight Saving Time flag
mbed_official 235:685d5f11838f 147 */
mbed_official 235:685d5f11838f 148 time_t rtc_read(void)
mbed_official 235:685d5f11838f 149 {
mbed_official 235:685d5f11838f 150 RTC_DateTypeDef dateStruct;
mbed_official 235:685d5f11838f 151 RTC_TimeTypeDef timeStruct;
mbed_official 235:685d5f11838f 152 struct tm timeinfo;
mbed_official 235:685d5f11838f 153
mbed_official 235:685d5f11838f 154 RtcHandle.Instance = RTC;
mbed_official 235:685d5f11838f 155
mbed_official 235:685d5f11838f 156 // Read actual date and time
mbed_official 235:685d5f11838f 157 // Warning: the time must be read first!
mbed_official 235:685d5f11838f 158 HAL_RTC_GetTime(&RtcHandle, &timeStruct, FORMAT_BIN);
mbed_official 235:685d5f11838f 159 HAL_RTC_GetDate(&RtcHandle, &dateStruct, FORMAT_BIN);
mbed_official 235:685d5f11838f 160
mbed_official 235:685d5f11838f 161 // Setup a tm structure based on the RTC
mbed_official 235:685d5f11838f 162 timeinfo.tm_wday = dateStruct.WeekDay;
mbed_official 235:685d5f11838f 163 timeinfo.tm_mon = dateStruct.Month - 1;
mbed_official 235:685d5f11838f 164 timeinfo.tm_mday = dateStruct.Date;
mbed_official 235:685d5f11838f 165 timeinfo.tm_year = dateStruct.Year + 100;
mbed_official 235:685d5f11838f 166 timeinfo.tm_hour = timeStruct.Hours;
mbed_official 235:685d5f11838f 167 timeinfo.tm_min = timeStruct.Minutes;
mbed_official 235:685d5f11838f 168 timeinfo.tm_sec = timeStruct.Seconds;
mbed_official 235:685d5f11838f 169
mbed_official 235:685d5f11838f 170 // Convert to timestamp
mbed_official 235:685d5f11838f 171 time_t t = mktime(&timeinfo);
mbed_official 235:685d5f11838f 172
mbed_official 235:685d5f11838f 173 return t;
mbed_official 235:685d5f11838f 174 }
mbed_official 235:685d5f11838f 175
mbed_official 235:685d5f11838f 176 void rtc_write(time_t t)
mbed_official 235:685d5f11838f 177 {
mbed_official 235:685d5f11838f 178 RTC_DateTypeDef dateStruct;
mbed_official 235:685d5f11838f 179 RTC_TimeTypeDef timeStruct;
mbed_official 235:685d5f11838f 180
mbed_official 235:685d5f11838f 181 RtcHandle.Instance = RTC;
mbed_official 235:685d5f11838f 182
mbed_official 235:685d5f11838f 183 // Convert the time into a tm
mbed_official 235:685d5f11838f 184 struct tm *timeinfo = localtime(&t);
mbed_official 235:685d5f11838f 185
mbed_official 235:685d5f11838f 186 // Fill RTC structures
mbed_official 235:685d5f11838f 187 dateStruct.WeekDay = timeinfo->tm_wday;
mbed_official 235:685d5f11838f 188 dateStruct.Month = timeinfo->tm_mon + 1;
mbed_official 235:685d5f11838f 189 dateStruct.Date = timeinfo->tm_mday;
mbed_official 235:685d5f11838f 190 dateStruct.Year = timeinfo->tm_year - 100;
mbed_official 235:685d5f11838f 191 timeStruct.Hours = timeinfo->tm_hour;
mbed_official 235:685d5f11838f 192 timeStruct.Minutes = timeinfo->tm_min;
mbed_official 235:685d5f11838f 193 timeStruct.Seconds = timeinfo->tm_sec;
mbed_official 235:685d5f11838f 194 timeStruct.TimeFormat = RTC_HOURFORMAT12_PM;
mbed_official 235:685d5f11838f 195 timeStruct.DayLightSaving = RTC_DAYLIGHTSAVING_NONE;
mbed_official 235:685d5f11838f 196 timeStruct.StoreOperation = RTC_STOREOPERATION_RESET;
mbed_official 235:685d5f11838f 197
mbed_official 235:685d5f11838f 198 // Change the RTC current date/time
mbed_official 235:685d5f11838f 199 HAL_RTC_SetDate(&RtcHandle, &dateStruct, FORMAT_BIN);
mbed_official 235:685d5f11838f 200 HAL_RTC_SetTime(&RtcHandle, &timeStruct, FORMAT_BIN);
mbed_official 235:685d5f11838f 201 }
mbed_official 235:685d5f11838f 202
mbed_official 235:685d5f11838f 203 #endif