teralytic / mbed-dev

mbed library sources. Supersedes mbed-src.

Fork of mbed by teralytic

targets/hal/TARGET_STM/TARGET_STM32F2/rtc_api.c@148:4802eb17e82b, 2016-10-17 (annotated)

Committer:
rodriguise
Date:
Mon Oct 17 18:47:01 2016 +0000
Revision:
148:4802eb17e82b
Parent:
144:ef7eb2e8f9f7 
backup

Who changed what in which revision?

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<> 144:ef7eb2e8f9f7 1 /* mbed Microcontroller Library
<> 144:ef7eb2e8f9f7 2 *******************************************************************************
<> 144:ef7eb2e8f9f7 3 * Copyright (c) 2016, STMicroelectronics
<> 144:ef7eb2e8f9f7 4 * All rights reserved.
<> 144:ef7eb2e8f9f7 5 *
<> 144:ef7eb2e8f9f7 6 * Redistribution and use in source and binary forms, with or without
<> 144:ef7eb2e8f9f7 7 * modification, are permitted provided that the following conditions are met:
<> 144:ef7eb2e8f9f7 8 *
<> 144:ef7eb2e8f9f7 9 * 1. Redistributions of source code must retain the above copyright notice,
<> 144:ef7eb2e8f9f7 10 * this list of conditions and the following disclaimer.
<> 144:ef7eb2e8f9f7 11 * 2. Redistributions in binary form must reproduce the above copyright notice,
<> 144:ef7eb2e8f9f7 12 * this list of conditions and the following disclaimer in the documentation
<> 144:ef7eb2e8f9f7 13 * and/or other materials provided with the distribution.
<> 144:ef7eb2e8f9f7 14 * 3. Neither the name of STMicroelectronics nor the names of its contributors
<> 144:ef7eb2e8f9f7 15 * may be used to endorse or promote products derived from this software
<> 144:ef7eb2e8f9f7 16 * without specific prior written permission.
<> 144:ef7eb2e8f9f7 17 *
<> 144:ef7eb2e8f9f7 18 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
<> 144:ef7eb2e8f9f7 19 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
<> 144:ef7eb2e8f9f7 20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
<> 144:ef7eb2e8f9f7 21 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
<> 144:ef7eb2e8f9f7 22 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
<> 144:ef7eb2e8f9f7 23 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
<> 144:ef7eb2e8f9f7 24 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
<> 144:ef7eb2e8f9f7 25 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
<> 144:ef7eb2e8f9f7 26 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
<> 144:ef7eb2e8f9f7 27 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
<> 144:ef7eb2e8f9f7 28 *******************************************************************************
<> 144:ef7eb2e8f9f7 29 */
<> 144:ef7eb2e8f9f7 30 #include "rtc_api.h"
<> 144:ef7eb2e8f9f7 31
<> 144:ef7eb2e8f9f7 32 #if DEVICE_RTC
<> 144:ef7eb2e8f9f7 33
<> 144:ef7eb2e8f9f7 34 #include "mbed_error.h"
<> 144:ef7eb2e8f9f7 35
<> 144:ef7eb2e8f9f7 36 #if DEVICE_RTC_LSI
<> 144:ef7eb2e8f9f7 37 static int rtc_inited = 0;
<> 144:ef7eb2e8f9f7 38 #endif
<> 144:ef7eb2e8f9f7 39
<> 144:ef7eb2e8f9f7 40 static RTC_HandleTypeDef RtcHandle;
<> 144:ef7eb2e8f9f7 41
<> 144:ef7eb2e8f9f7 42 void rtc_init(void)
<> 144:ef7eb2e8f9f7 43 {
<> 144:ef7eb2e8f9f7 44 RCC_OscInitTypeDef RCC_OscInitStruct;
<> 144:ef7eb2e8f9f7 45 uint32_t rtc_freq = 0;
<> 144:ef7eb2e8f9f7 46
<> 144:ef7eb2e8f9f7 47 #if DEVICE_RTC_LSI
<> 144:ef7eb2e8f9f7 48 rtc_inited = 1;
<> 144:ef7eb2e8f9f7 49 #endif
<> 144:ef7eb2e8f9f7 50
<> 144:ef7eb2e8f9f7 51 RtcHandle.Instance = RTC;
<> 144:ef7eb2e8f9f7 52
<> 144:ef7eb2e8f9f7 53 #if !DEVICE_RTC_LSI
<> 144:ef7eb2e8f9f7 54 // Enable LSE Oscillator
<> 144:ef7eb2e8f9f7 55 RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_LSE;
<> 144:ef7eb2e8f9f7 56 RCC_OscInitStruct.PLL.PLLState = RCC_PLL_NONE; /* Mandatory, otherwise the PLL is reconfigured! */
<> 144:ef7eb2e8f9f7 57 RCC_OscInitStruct.LSEState = RCC_LSE_ON; /* External 32.768 kHz clock on OSC_IN/OSC_OUT */
<> 144:ef7eb2e8f9f7 58 if (HAL_RCC_OscConfig(&RCC_OscInitStruct) == HAL_OK) {
<> 144:ef7eb2e8f9f7 59 // Connect LSE to RTC
<> 144:ef7eb2e8f9f7 60 __HAL_RCC_RTC_CLKPRESCALER(RCC_RTCCLKSOURCE_LSE);
<> 144:ef7eb2e8f9f7 61 __HAL_RCC_RTC_CONFIG(RCC_RTCCLKSOURCE_LSE);
<> 144:ef7eb2e8f9f7 62 rtc_freq = LSE_VALUE;
<> 144:ef7eb2e8f9f7 63 } else {
<> 144:ef7eb2e8f9f7 64 error("RTC error: LSE clock initialization failed.");
<> 144:ef7eb2e8f9f7 65 }
<> 144:ef7eb2e8f9f7 66 #else
<> 144:ef7eb2e8f9f7 67 // Enable Power clock
<> 144:ef7eb2e8f9f7 68 __PWR_CLK_ENABLE();
<> 144:ef7eb2e8f9f7 69
<> 144:ef7eb2e8f9f7 70 // Enable access to Backup domain
<> 144:ef7eb2e8f9f7 71 HAL_PWR_EnableBkUpAccess();
<> 144:ef7eb2e8f9f7 72
<> 144:ef7eb2e8f9f7 73 // Reset Backup domain
<> 144:ef7eb2e8f9f7 74 __HAL_RCC_BACKUPRESET_FORCE();
<> 144:ef7eb2e8f9f7 75 __HAL_RCC_BACKUPRESET_RELEASE();
<> 144:ef7eb2e8f9f7 76
<> 144:ef7eb2e8f9f7 77 // Enable LSI clock
<> 144:ef7eb2e8f9f7 78 RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_LSI | RCC_OSCILLATORTYPE_LSE;
<> 144:ef7eb2e8f9f7 79 RCC_OscInitStruct.PLL.PLLState = RCC_PLL_NONE; // Mandatory, otherwise the PLL is reconfigured!
<> 144:ef7eb2e8f9f7 80 RCC_OscInitStruct.LSEState = RCC_LSE_OFF;
<> 144:ef7eb2e8f9f7 81 RCC_OscInitStruct.LSIState = RCC_LSI_ON;
<> 144:ef7eb2e8f9f7 82 if (HAL_RCC_OscConfig(&RCC_OscInitStruct) != HAL_OK) {
<> 144:ef7eb2e8f9f7 83 error("RTC error: LSI clock initialization failed.");
<> 144:ef7eb2e8f9f7 84 }
<> 144:ef7eb2e8f9f7 85 // Connect LSI to RTC
<> 144:ef7eb2e8f9f7 86 __HAL_RCC_RTC_CLKPRESCALER(RCC_RTCCLKSOURCE_LSI);
<> 144:ef7eb2e8f9f7 87 __HAL_RCC_RTC_CONFIG(RCC_RTCCLKSOURCE_LSI);
<> 144:ef7eb2e8f9f7 88 // [TODO] This value is LSI typical value. To be measured precisely using a timer input capture
<> 144:ef7eb2e8f9f7 89 rtc_freq = LSI_VALUE;
<> 144:ef7eb2e8f9f7 90 #endif
<> 144:ef7eb2e8f9f7 91
<> 144:ef7eb2e8f9f7 92 // Enable RTC
<> 144:ef7eb2e8f9f7 93 __HAL_RCC_RTC_ENABLE();
<> 144:ef7eb2e8f9f7 94
<> 144:ef7eb2e8f9f7 95 RtcHandle.Init.HourFormat = RTC_HOURFORMAT_24;
<> 144:ef7eb2e8f9f7 96 RtcHandle.Init.AsynchPrediv = 127;
<> 144:ef7eb2e8f9f7 97 RtcHandle.Init.SynchPrediv = (rtc_freq / 128) - 1;
<> 144:ef7eb2e8f9f7 98 RtcHandle.Init.OutPut = RTC_OUTPUT_DISABLE;
<> 144:ef7eb2e8f9f7 99 RtcHandle.Init.OutPutPolarity = RTC_OUTPUT_POLARITY_HIGH;
<> 144:ef7eb2e8f9f7 100 RtcHandle.Init.OutPutType = RTC_OUTPUT_TYPE_OPENDRAIN;
<> 144:ef7eb2e8f9f7 101
<> 144:ef7eb2e8f9f7 102 if (HAL_RTC_Init(&RtcHandle) != HAL_OK) {
<> 144:ef7eb2e8f9f7 103 error("RTC error: RTC initialization failed.");
<> 144:ef7eb2e8f9f7 104 }
<> 144:ef7eb2e8f9f7 105 }
<> 144:ef7eb2e8f9f7 106
<> 144:ef7eb2e8f9f7 107 void rtc_free(void)
<> 144:ef7eb2e8f9f7 108 {
<> 144:ef7eb2e8f9f7 109 #if DEVICE_RTC_LSI
<> 144:ef7eb2e8f9f7 110 // Enable Power clock
<> 144:ef7eb2e8f9f7 111 __PWR_CLK_ENABLE();
<> 144:ef7eb2e8f9f7 112
<> 144:ef7eb2e8f9f7 113 // Enable access to Backup domain
<> 144:ef7eb2e8f9f7 114 HAL_PWR_EnableBkUpAccess();
<> 144:ef7eb2e8f9f7 115
<> 144:ef7eb2e8f9f7 116 // Reset Backup domain
<> 144:ef7eb2e8f9f7 117 __HAL_RCC_BACKUPRESET_FORCE();
<> 144:ef7eb2e8f9f7 118 __HAL_RCC_BACKUPRESET_RELEASE();
<> 144:ef7eb2e8f9f7 119
<> 144:ef7eb2e8f9f7 120 // Disable access to Backup domain
<> 144:ef7eb2e8f9f7 121 HAL_PWR_DisableBkUpAccess();
<> 144:ef7eb2e8f9f7 122 #endif
<> 144:ef7eb2e8f9f7 123
<> 144:ef7eb2e8f9f7 124 // Disable LSI and LSE clocks
<> 144:ef7eb2e8f9f7 125 RCC_OscInitTypeDef RCC_OscInitStruct;
<> 144:ef7eb2e8f9f7 126 RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_LSI | RCC_OSCILLATORTYPE_LSE;
<> 144:ef7eb2e8f9f7 127 RCC_OscInitStruct.PLL.PLLState = RCC_PLL_NONE;
<> 144:ef7eb2e8f9f7 128 RCC_OscInitStruct.LSIState = RCC_LSI_OFF;
<> 144:ef7eb2e8f9f7 129 RCC_OscInitStruct.LSEState = RCC_LSE_OFF;
<> 144:ef7eb2e8f9f7 130 HAL_RCC_OscConfig(&RCC_OscInitStruct);
<> 144:ef7eb2e8f9f7 131 #if DEVICE_RTC_LSI
<> 144:ef7eb2e8f9f7 132 rtc_inited = 0;
<> 144:ef7eb2e8f9f7 133 #endif
<> 144:ef7eb2e8f9f7 134 }
<> 144:ef7eb2e8f9f7 135
<> 144:ef7eb2e8f9f7 136 int rtc_isenabled(void)
<> 144:ef7eb2e8f9f7 137 {
<> 144:ef7eb2e8f9f7 138 #if DEVICE_RTC_LSI
<> 144:ef7eb2e8f9f7 139 return rtc_inited;
<> 144:ef7eb2e8f9f7 140 #else
<> 144:ef7eb2e8f9f7 141 if ((RTC->ISR & RTC_ISR_INITS) == RTC_ISR_INITS) {
<> 144:ef7eb2e8f9f7 142 return 1;
<> 144:ef7eb2e8f9f7 143 } else {
<> 144:ef7eb2e8f9f7 144 return 0;
<> 144:ef7eb2e8f9f7 145 }
<> 144:ef7eb2e8f9f7 146 #endif
<> 144:ef7eb2e8f9f7 147 }
<> 144:ef7eb2e8f9f7 148
<> 144:ef7eb2e8f9f7 149 /*
<> 144:ef7eb2e8f9f7 150 RTC Registers
<> 144:ef7eb2e8f9f7 151 RTC_WeekDay 1=monday, 2=tuesday, ..., 7=sunday
<> 144:ef7eb2e8f9f7 152 RTC_Month 1=january, 2=february, ..., 12=december
<> 144:ef7eb2e8f9f7 153 RTC_Date day of the month 1-31
<> 144:ef7eb2e8f9f7 154 RTC_Year year 0-99
<> 144:ef7eb2e8f9f7 155 struct tm
<> 144:ef7eb2e8f9f7 156 tm_sec seconds after the minute 0-61
<> 144:ef7eb2e8f9f7 157 tm_min minutes after the hour 0-59
<> 144:ef7eb2e8f9f7 158 tm_hour hours since midnight 0-23
<> 144:ef7eb2e8f9f7 159 tm_mday day of the month 1-31
<> 144:ef7eb2e8f9f7 160 tm_mon months since January 0-11
<> 144:ef7eb2e8f9f7 161 tm_year years since 1900
<> 144:ef7eb2e8f9f7 162 tm_wday days since Sunday 0-6
<> 144:ef7eb2e8f9f7 163 tm_yday days since January 1 0-365
<> 144:ef7eb2e8f9f7 164 tm_isdst Daylight Saving Time flag
<> 144:ef7eb2e8f9f7 165 */
<> 144:ef7eb2e8f9f7 166 time_t rtc_read(void)
<> 144:ef7eb2e8f9f7 167 {
<> 144:ef7eb2e8f9f7 168 RTC_DateTypeDef dateStruct;
<> 144:ef7eb2e8f9f7 169 RTC_TimeTypeDef timeStruct;
<> 144:ef7eb2e8f9f7 170 struct tm timeinfo;
<> 144:ef7eb2e8f9f7 171
<> 144:ef7eb2e8f9f7 172 RtcHandle.Instance = RTC;
<> 144:ef7eb2e8f9f7 173
<> 144:ef7eb2e8f9f7 174 // Read actual date and time
<> 144:ef7eb2e8f9f7 175 // Warning: the time must be read first!
<> 144:ef7eb2e8f9f7 176 HAL_RTC_GetTime(&RtcHandle, &timeStruct, FORMAT_BIN);
<> 144:ef7eb2e8f9f7 177 HAL_RTC_GetDate(&RtcHandle, &dateStruct, FORMAT_BIN);
<> 144:ef7eb2e8f9f7 178
<> 144:ef7eb2e8f9f7 179 // Setup a tm structure based on the RTC
<> 144:ef7eb2e8f9f7 180 timeinfo.tm_wday = dateStruct.WeekDay;
<> 144:ef7eb2e8f9f7 181 timeinfo.tm_mon = dateStruct.Month - 1;
<> 144:ef7eb2e8f9f7 182 timeinfo.tm_mday = dateStruct.Date;
<> 144:ef7eb2e8f9f7 183 timeinfo.tm_year = dateStruct.Year + 68;
<> 144:ef7eb2e8f9f7 184 timeinfo.tm_hour = timeStruct.Hours;
<> 144:ef7eb2e8f9f7 185 timeinfo.tm_min = timeStruct.Minutes;
<> 144:ef7eb2e8f9f7 186 timeinfo.tm_sec = timeStruct.Seconds;
<> 144:ef7eb2e8f9f7 187 timeinfo.tm_isdst = -1;
<> 144:ef7eb2e8f9f7 188
<> 144:ef7eb2e8f9f7 189 // Convert to timestamp
<> 144:ef7eb2e8f9f7 190 time_t t = mktime(&timeinfo);
<> 144:ef7eb2e8f9f7 191
<> 144:ef7eb2e8f9f7 192 return t;
<> 144:ef7eb2e8f9f7 193 }
<> 144:ef7eb2e8f9f7 194
<> 144:ef7eb2e8f9f7 195 void rtc_write(time_t t)
<> 144:ef7eb2e8f9f7 196 {
<> 144:ef7eb2e8f9f7 197 RTC_DateTypeDef dateStruct;
<> 144:ef7eb2e8f9f7 198 RTC_TimeTypeDef timeStruct;
<> 144:ef7eb2e8f9f7 199
<> 144:ef7eb2e8f9f7 200 RtcHandle.Instance = RTC;
<> 144:ef7eb2e8f9f7 201
<> 144:ef7eb2e8f9f7 202 // Convert the time into a tm
<> 144:ef7eb2e8f9f7 203 struct tm *timeinfo = localtime(&t);
<> 144:ef7eb2e8f9f7 204
<> 144:ef7eb2e8f9f7 205 // Fill RTC structures
<> 144:ef7eb2e8f9f7 206 dateStruct.WeekDay = timeinfo->tm_wday;
<> 144:ef7eb2e8f9f7 207 dateStruct.Month = timeinfo->tm_mon + 1;
<> 144:ef7eb2e8f9f7 208 dateStruct.Date = timeinfo->tm_mday;
<> 144:ef7eb2e8f9f7 209 dateStruct.Year = timeinfo->tm_year - 68;
<> 144:ef7eb2e8f9f7 210 timeStruct.Hours = timeinfo->tm_hour;
<> 144:ef7eb2e8f9f7 211 timeStruct.Minutes = timeinfo->tm_min;
<> 144:ef7eb2e8f9f7 212 timeStruct.Seconds = timeinfo->tm_sec;
<> 144:ef7eb2e8f9f7 213 timeStruct.TimeFormat = RTC_HOURFORMAT_24;
<> 144:ef7eb2e8f9f7 214 timeStruct.DayLightSaving = RTC_DAYLIGHTSAVING_NONE;
<> 144:ef7eb2e8f9f7 215 timeStruct.StoreOperation = RTC_STOREOPERATION_RESET;
<> 144:ef7eb2e8f9f7 216
<> 144:ef7eb2e8f9f7 217 // Change the RTC current date/time
<> 144:ef7eb2e8f9f7 218 HAL_RTC_SetDate(&RtcHandle, &dateStruct, FORMAT_BIN);
<> 144:ef7eb2e8f9f7 219 HAL_RTC_SetTime(&RtcHandle, &timeStruct, FORMAT_BIN);
<> 144:ef7eb2e8f9f7 220 }
<> 144:ef7eb2e8f9f7 221
<> 144:ef7eb2e8f9f7 222 #endif