gabriel della-monica / mbed-src

mbed library sources

Fork of mbed-src by mbed official

targets/hal/TARGET_STM/TARGET_DISCO_L053C8/rtc_api.c@376:cb4d9db17537, 2014-10-31 (annotated)

Committer:
mbed_official
Date:
Fri Oct 31 11:00:10 2014 +0000
Revision:
376:cb4d9db17537
Child:
439:c4382fcbbaed
Synchronized with git revision 07b49da75eac883fc8916d3d6b6962664b8db29e



Full URL: https://github.com/mbedmicro/mbed/commit/07b49da75eac883fc8916d3d6b6962664b8db29e/



Targets: DISCO_L053C8 - new platform - STM32L0 Discovery board

Who changed what in which revision?

UserRevisionLine numberNew contents of line
mbed_official 376:cb4d9db17537 1 /* mbed Microcontroller Library
mbed_official 376:cb4d9db17537 2 *******************************************************************************
mbed_official 376:cb4d9db17537 3 * Copyright (c) 2014, STMicroelectronics
mbed_official 376:cb4d9db17537 4 * All rights reserved.
mbed_official 376:cb4d9db17537 5 *
mbed_official 376:cb4d9db17537 6 * Redistribution and use in source and binary forms, with or without
mbed_official 376:cb4d9db17537 7 * modification, are permitted provided that the following conditions are met:
mbed_official 376:cb4d9db17537 8 *
mbed_official 376:cb4d9db17537 9 * 1. Redistributions of source code must retain the above copyright notice,
mbed_official 376:cb4d9db17537 10 * this list of conditions and the following disclaimer.
mbed_official 376:cb4d9db17537 11 * 2. Redistributions in binary form must reproduce the above copyright notice,
mbed_official 376:cb4d9db17537 12 * this list of conditions and the following disclaimer in the documentation
mbed_official 376:cb4d9db17537 13 * and/or other materials provided with the distribution.
mbed_official 376:cb4d9db17537 14 * 3. Neither the name of STMicroelectronics nor the names of its contributors
mbed_official 376:cb4d9db17537 15 * may be used to endorse or promote products derived from this software
mbed_official 376:cb4d9db17537 16 * without specific prior written permission.
mbed_official 376:cb4d9db17537 17 *
mbed_official 376:cb4d9db17537 18 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
mbed_official 376:cb4d9db17537 19 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
mbed_official 376:cb4d9db17537 20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
mbed_official 376:cb4d9db17537 21 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
mbed_official 376:cb4d9db17537 22 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
mbed_official 376:cb4d9db17537 23 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
mbed_official 376:cb4d9db17537 24 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
mbed_official 376:cb4d9db17537 25 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
mbed_official 376:cb4d9db17537 26 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
mbed_official 376:cb4d9db17537 27 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
mbed_official 376:cb4d9db17537 28 *******************************************************************************
mbed_official 376:cb4d9db17537 29 */
mbed_official 376:cb4d9db17537 30 #include "rtc_api.h"
mbed_official 376:cb4d9db17537 31
mbed_official 376:cb4d9db17537 32 #if DEVICE_RTC
mbed_official 376:cb4d9db17537 33
mbed_official 376:cb4d9db17537 34 #include "mbed_error.h"
mbed_official 376:cb4d9db17537 35
mbed_official 376:cb4d9db17537 36 static int rtc_inited = 0;
mbed_official 376:cb4d9db17537 37
mbed_official 376:cb4d9db17537 38 static RTC_HandleTypeDef RtcHandle;
mbed_official 376:cb4d9db17537 39
mbed_official 376:cb4d9db17537 40 void rtc_init(void) {
mbed_official 376:cb4d9db17537 41 RCC_OscInitTypeDef RCC_OscInitStruct;
mbed_official 376:cb4d9db17537 42 uint32_t rtc_freq = 0;
mbed_official 376:cb4d9db17537 43
mbed_official 376:cb4d9db17537 44 if (rtc_inited) return;
mbed_official 376:cb4d9db17537 45 rtc_inited = 1;
mbed_official 376:cb4d9db17537 46
mbed_official 376:cb4d9db17537 47 RtcHandle.Instance = RTC;
mbed_official 376:cb4d9db17537 48
mbed_official 376:cb4d9db17537 49 // Enable Power clock
mbed_official 376:cb4d9db17537 50 __PWR_CLK_ENABLE();
mbed_official 376:cb4d9db17537 51
mbed_official 376:cb4d9db17537 52 // Enable access to Backup domain
mbed_official 376:cb4d9db17537 53 HAL_PWR_EnableBkUpAccess();
mbed_official 376:cb4d9db17537 54
mbed_official 376:cb4d9db17537 55 // Reset Backup domain
mbed_official 376:cb4d9db17537 56 __HAL_RCC_BACKUPRESET_FORCE();
mbed_official 376:cb4d9db17537 57 __HAL_RCC_BACKUPRESET_RELEASE();
mbed_official 376:cb4d9db17537 58
mbed_official 376:cb4d9db17537 59 // Enable LSE Oscillator
mbed_official 376:cb4d9db17537 60 RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_LSE;
mbed_official 376:cb4d9db17537 61 RCC_OscInitStruct.PLL.PLLState = RCC_PLL_NONE; /* Mandatory, otherwise the PLL is reconfigured! */
mbed_official 376:cb4d9db17537 62 RCC_OscInitStruct.LSEState = RCC_LSE_ON; /* External 32.768 kHz clock on OSC_IN/OSC_OUT */
mbed_official 376:cb4d9db17537 63 if (HAL_RCC_OscConfig(&RCC_OscInitStruct) == HAL_OK) {
mbed_official 376:cb4d9db17537 64 // Connect LSE to RTC
mbed_official 376:cb4d9db17537 65 __HAL_RCC_RTC_CLKPRESCALER(RCC_RTCCLKSOURCE_LSE);
mbed_official 376:cb4d9db17537 66 __HAL_RCC_RTC_CONFIG(RCC_RTCCLKSOURCE_LSE);
mbed_official 376:cb4d9db17537 67 rtc_freq = LSE_VALUE;
mbed_official 376:cb4d9db17537 68 } else {
mbed_official 376:cb4d9db17537 69 // Enable LSI clock
mbed_official 376:cb4d9db17537 70 RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_LSI | RCC_OSCILLATORTYPE_LSE;
mbed_official 376:cb4d9db17537 71 RCC_OscInitStruct.PLL.PLLState = RCC_PLL_NONE; // Mandatory, otherwise the PLL is reconfigured!
mbed_official 376:cb4d9db17537 72 RCC_OscInitStruct.LSEState = RCC_LSE_OFF;
mbed_official 376:cb4d9db17537 73 RCC_OscInitStruct.LSIState = RCC_LSI_ON;
mbed_official 376:cb4d9db17537 74 if (HAL_RCC_OscConfig(&RCC_OscInitStruct) != HAL_OK) {
mbed_official 376:cb4d9db17537 75 error("RTC error: LSI clock initialization failed.");
mbed_official 376:cb4d9db17537 76 }
mbed_official 376:cb4d9db17537 77 // Connect LSI to RTC
mbed_official 376:cb4d9db17537 78 __HAL_RCC_RTC_CLKPRESCALER(RCC_RTCCLKSOURCE_LSI);
mbed_official 376:cb4d9db17537 79 __HAL_RCC_RTC_CONFIG(RCC_RTCCLKSOURCE_LSI);
mbed_official 376:cb4d9db17537 80 // [TODO] This value is LSI typical value. To be measured precisely using a timer input capture
mbed_official 376:cb4d9db17537 81 rtc_freq = 32000;
mbed_official 376:cb4d9db17537 82 }
mbed_official 376:cb4d9db17537 83
mbed_official 376:cb4d9db17537 84 // Enable RTC
mbed_official 376:cb4d9db17537 85 __HAL_RCC_RTC_ENABLE();
mbed_official 376:cb4d9db17537 86
mbed_official 376:cb4d9db17537 87 RtcHandle.Init.HourFormat = RTC_HOURFORMAT_24;
mbed_official 376:cb4d9db17537 88 RtcHandle.Init.AsynchPrediv = 127;
mbed_official 376:cb4d9db17537 89 RtcHandle.Init.SynchPrediv = (rtc_freq / 128) - 1;
mbed_official 376:cb4d9db17537 90 RtcHandle.Init.OutPut = RTC_OUTPUT_DISABLE;
mbed_official 376:cb4d9db17537 91 RtcHandle.Init.OutPutPolarity = RTC_OUTPUT_POLARITY_HIGH;
mbed_official 376:cb4d9db17537 92 RtcHandle.Init.OutPutType = RTC_OUTPUT_TYPE_OPENDRAIN;
mbed_official 376:cb4d9db17537 93
mbed_official 376:cb4d9db17537 94 if (HAL_RTC_Init(&RtcHandle) != HAL_OK) {
mbed_official 376:cb4d9db17537 95 error("RTC error: RTC initialization failed.");
mbed_official 376:cb4d9db17537 96 }
mbed_official 376:cb4d9db17537 97 }
mbed_official 376:cb4d9db17537 98
mbed_official 376:cb4d9db17537 99 void rtc_free(void) {
mbed_official 376:cb4d9db17537 100 // Enable Power clock
mbed_official 376:cb4d9db17537 101 __PWR_CLK_ENABLE();
mbed_official 376:cb4d9db17537 102
mbed_official 376:cb4d9db17537 103 // Enable access to Backup domain
mbed_official 376:cb4d9db17537 104 HAL_PWR_EnableBkUpAccess();
mbed_official 376:cb4d9db17537 105
mbed_official 376:cb4d9db17537 106 // Reset Backup domain
mbed_official 376:cb4d9db17537 107 __HAL_RCC_BACKUPRESET_FORCE();
mbed_official 376:cb4d9db17537 108 __HAL_RCC_BACKUPRESET_RELEASE();
mbed_official 376:cb4d9db17537 109
mbed_official 376:cb4d9db17537 110 // Disable access to Backup domain
mbed_official 376:cb4d9db17537 111 HAL_PWR_DisableBkUpAccess();
mbed_official 376:cb4d9db17537 112
mbed_official 376:cb4d9db17537 113 // Disable LSI and LSE clocks
mbed_official 376:cb4d9db17537 114 RCC_OscInitTypeDef RCC_OscInitStruct;
mbed_official 376:cb4d9db17537 115 RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_LSI | RCC_OSCILLATORTYPE_LSE;
mbed_official 376:cb4d9db17537 116 RCC_OscInitStruct.PLL.PLLState = RCC_PLL_NONE;
mbed_official 376:cb4d9db17537 117 RCC_OscInitStruct.LSIState = RCC_LSI_OFF;
mbed_official 376:cb4d9db17537 118 RCC_OscInitStruct.LSEState = RCC_LSE_OFF;
mbed_official 376:cb4d9db17537 119 HAL_RCC_OscConfig(&RCC_OscInitStruct);
mbed_official 376:cb4d9db17537 120
mbed_official 376:cb4d9db17537 121 rtc_inited = 0;
mbed_official 376:cb4d9db17537 122 }
mbed_official 376:cb4d9db17537 123
mbed_official 376:cb4d9db17537 124 int rtc_isenabled(void) {
mbed_official 376:cb4d9db17537 125 return rtc_inited;
mbed_official 376:cb4d9db17537 126 }
mbed_official 376:cb4d9db17537 127
mbed_official 376:cb4d9db17537 128 /*
mbed_official 376:cb4d9db17537 129 RTC Registers
mbed_official 376:cb4d9db17537 130 RTC_WeekDay 1=monday, 2=tuesday, ..., 7=sunday
mbed_official 376:cb4d9db17537 131 RTC_Month 1=january, 2=february, ..., 12=december
mbed_official 376:cb4d9db17537 132 RTC_Date day of the month 1-31
mbed_official 376:cb4d9db17537 133 RTC_Year year 0-99
mbed_official 376:cb4d9db17537 134 struct tm
mbed_official 376:cb4d9db17537 135 tm_sec seconds after the minute 0-61
mbed_official 376:cb4d9db17537 136 tm_min minutes after the hour 0-59
mbed_official 376:cb4d9db17537 137 tm_hour hours since midnight 0-23
mbed_official 376:cb4d9db17537 138 tm_mday day of the month 1-31
mbed_official 376:cb4d9db17537 139 tm_mon months since January 0-11
mbed_official 376:cb4d9db17537 140 tm_year years since 1900
mbed_official 376:cb4d9db17537 141 tm_wday days since Sunday 0-6
mbed_official 376:cb4d9db17537 142 tm_yday days since January 1 0-365
mbed_official 376:cb4d9db17537 143 tm_isdst Daylight Saving Time flag
mbed_official 376:cb4d9db17537 144 */
mbed_official 376:cb4d9db17537 145 time_t rtc_read(void) {
mbed_official 376:cb4d9db17537 146 RTC_DateTypeDef dateStruct;
mbed_official 376:cb4d9db17537 147 RTC_TimeTypeDef timeStruct;
mbed_official 376:cb4d9db17537 148 struct tm timeinfo;
mbed_official 376:cb4d9db17537 149
mbed_official 376:cb4d9db17537 150 RtcHandle.Instance = RTC;
mbed_official 376:cb4d9db17537 151
mbed_official 376:cb4d9db17537 152 // Read actual date and time
mbed_official 376:cb4d9db17537 153 // Warning: the time must be read first!
mbed_official 376:cb4d9db17537 154 HAL_RTC_GetTime(&RtcHandle, &timeStruct, FORMAT_BIN);
mbed_official 376:cb4d9db17537 155 HAL_RTC_GetDate(&RtcHandle, &dateStruct, FORMAT_BIN);
mbed_official 376:cb4d9db17537 156
mbed_official 376:cb4d9db17537 157 // Setup a tm structure based on the RTC
mbed_official 376:cb4d9db17537 158 timeinfo.tm_wday = dateStruct.WeekDay;
mbed_official 376:cb4d9db17537 159 timeinfo.tm_mon = dateStruct.Month - 1;
mbed_official 376:cb4d9db17537 160 timeinfo.tm_mday = dateStruct.Date;
mbed_official 376:cb4d9db17537 161 timeinfo.tm_year = dateStruct.Year + 100;
mbed_official 376:cb4d9db17537 162 timeinfo.tm_hour = timeStruct.Hours;
mbed_official 376:cb4d9db17537 163 timeinfo.tm_min = timeStruct.Minutes;
mbed_official 376:cb4d9db17537 164 timeinfo.tm_sec = timeStruct.Seconds;
mbed_official 376:cb4d9db17537 165
mbed_official 376:cb4d9db17537 166 // Convert to timestamp
mbed_official 376:cb4d9db17537 167 time_t t = mktime(&timeinfo);
mbed_official 376:cb4d9db17537 168
mbed_official 376:cb4d9db17537 169 return t;
mbed_official 376:cb4d9db17537 170 }
mbed_official 376:cb4d9db17537 171
mbed_official 376:cb4d9db17537 172 void rtc_write(time_t t) {
mbed_official 376:cb4d9db17537 173 RTC_DateTypeDef dateStruct;
mbed_official 376:cb4d9db17537 174 RTC_TimeTypeDef timeStruct;
mbed_official 376:cb4d9db17537 175
mbed_official 376:cb4d9db17537 176 RtcHandle.Instance = RTC;
mbed_official 376:cb4d9db17537 177
mbed_official 376:cb4d9db17537 178 // Convert the time into a tm
mbed_official 376:cb4d9db17537 179 struct tm *timeinfo = localtime(&t);
mbed_official 376:cb4d9db17537 180
mbed_official 376:cb4d9db17537 181 // Fill RTC structures
mbed_official 376:cb4d9db17537 182 dateStruct.WeekDay = timeinfo->tm_wday;
mbed_official 376:cb4d9db17537 183 dateStruct.Month = timeinfo->tm_mon + 1;
mbed_official 376:cb4d9db17537 184 dateStruct.Date = timeinfo->tm_mday;
mbed_official 376:cb4d9db17537 185 dateStruct.Year = timeinfo->tm_year - 100;
mbed_official 376:cb4d9db17537 186 timeStruct.Hours = timeinfo->tm_hour;
mbed_official 376:cb4d9db17537 187 timeStruct.Minutes = timeinfo->tm_min;
mbed_official 376:cb4d9db17537 188 timeStruct.Seconds = timeinfo->tm_sec;
mbed_official 376:cb4d9db17537 189 timeStruct.TimeFormat = RTC_HOURFORMAT12_PM;
mbed_official 376:cb4d9db17537 190 timeStruct.DayLightSaving = RTC_DAYLIGHTSAVING_NONE;
mbed_official 376:cb4d9db17537 191 timeStruct.StoreOperation = RTC_STOREOPERATION_RESET;
mbed_official 376:cb4d9db17537 192
mbed_official 376:cb4d9db17537 193 // Change the RTC current date/time
mbed_official 376:cb4d9db17537 194 HAL_RTC_SetDate(&RtcHandle, &dateStruct, FORMAT_BIN);
mbed_official 376:cb4d9db17537 195 HAL_RTC_SetTime(&RtcHandle, &timeStruct, FORMAT_BIN);
mbed_official 376:cb4d9db17537 196 }
mbed_official 376:cb4d9db17537 197
mbed_official 376:cb4d9db17537 198 #endif