teralytic / mbed-dev

mbed library sources. Supersedes mbed-src.

Fork of mbed by teralytic

targets/hal/TARGET_STM/TARGET_STM32L4/rtc_api.c@0:9b334a45a8ff, 2015-10-01 (annotated)

Committer:
bogdanm
Date:
Thu Oct 01 15:25:22 2015 +0300
Revision:
0:9b334a45a8ff
Child:
34:bb6061527455
Initial commit on mbed-dev



Replaces mbed-src (now inactive)

Who changed what in which revision?

UserRevisionLine numberNew contents of line
bogdanm 0:9b334a45a8ff 1 /* mbed Microcontroller Library
bogdanm 0:9b334a45a8ff 2 *******************************************************************************
bogdanm 0:9b334a45a8ff 3 * Copyright (c) 2015, STMicroelectronics
bogdanm 0:9b334a45a8ff 4 * All rights reserved.
bogdanm 0:9b334a45a8ff 5 *
bogdanm 0:9b334a45a8ff 6 * Redistribution and use in source and binary forms, with or without
bogdanm 0:9b334a45a8ff 7 * modification, are permitted provided that the following conditions are met:
bogdanm 0:9b334a45a8ff 8 *
bogdanm 0:9b334a45a8ff 9 * 1. Redistributions of source code must retain the above copyright notice,
bogdanm 0:9b334a45a8ff 10 * this list of conditions and the following disclaimer.
bogdanm 0:9b334a45a8ff 11 * 2. Redistributions in binary form must reproduce the above copyright notice,
bogdanm 0:9b334a45a8ff 12 * this list of conditions and the following disclaimer in the documentation
bogdanm 0:9b334a45a8ff 13 * and/or other materials provided with the distribution.
bogdanm 0:9b334a45a8ff 14 * 3. Neither the name of STMicroelectronics nor the names of its contributors
bogdanm 0:9b334a45a8ff 15 * may be used to endorse or promote products derived from this software
bogdanm 0:9b334a45a8ff 16 * without specific prior written permission.
bogdanm 0:9b334a45a8ff 17 *
bogdanm 0:9b334a45a8ff 18 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
bogdanm 0:9b334a45a8ff 19 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
bogdanm 0:9b334a45a8ff 20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
bogdanm 0:9b334a45a8ff 21 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
bogdanm 0:9b334a45a8ff 22 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
bogdanm 0:9b334a45a8ff 23 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
bogdanm 0:9b334a45a8ff 24 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
bogdanm 0:9b334a45a8ff 25 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
bogdanm 0:9b334a45a8ff 26 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
bogdanm 0:9b334a45a8ff 27 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
bogdanm 0:9b334a45a8ff 28 *******************************************************************************
bogdanm 0:9b334a45a8ff 29 */
bogdanm 0:9b334a45a8ff 30 #include "rtc_api.h"
bogdanm 0:9b334a45a8ff 31
bogdanm 0:9b334a45a8ff 32 #if DEVICE_RTC
bogdanm 0:9b334a45a8ff 33
bogdanm 0:9b334a45a8ff 34 #include "mbed_error.h"
bogdanm 0:9b334a45a8ff 35
bogdanm 0:9b334a45a8ff 36 static int rtc_inited = 0;
bogdanm 0:9b334a45a8ff 37
bogdanm 0:9b334a45a8ff 38 static RTC_HandleTypeDef RtcHandle;
bogdanm 0:9b334a45a8ff 39
bogdanm 0:9b334a45a8ff 40 void rtc_init(void)
bogdanm 0:9b334a45a8ff 41 {
bogdanm 0:9b334a45a8ff 42 RCC_OscInitTypeDef RCC_OscInitStruct = {0};
bogdanm 0:9b334a45a8ff 43 RCC_PeriphCLKInitTypeDef PeriphClkInitStruct = {0};
bogdanm 0:9b334a45a8ff 44 uint32_t rtc_freq = 0;
bogdanm 0:9b334a45a8ff 45
bogdanm 0:9b334a45a8ff 46 if (rtc_inited) return;
bogdanm 0:9b334a45a8ff 47 rtc_inited = 1;
bogdanm 0:9b334a45a8ff 48
bogdanm 0:9b334a45a8ff 49 RtcHandle.Instance = RTC;
bogdanm 0:9b334a45a8ff 50
bogdanm 0:9b334a45a8ff 51 // Enable Power clock
bogdanm 0:9b334a45a8ff 52 __HAL_RCC_PWR_CLK_ENABLE();
bogdanm 0:9b334a45a8ff 53
bogdanm 0:9b334a45a8ff 54 // Enable access to Backup domain
bogdanm 0:9b334a45a8ff 55 HAL_PWR_EnableBkUpAccess();
bogdanm 0:9b334a45a8ff 56
bogdanm 0:9b334a45a8ff 57 // Reset Backup domain
bogdanm 0:9b334a45a8ff 58 __HAL_RCC_BACKUPRESET_FORCE();
bogdanm 0:9b334a45a8ff 59 __HAL_RCC_BACKUPRESET_RELEASE();
bogdanm 0:9b334a45a8ff 60
bogdanm 0:9b334a45a8ff 61 // Enable LSE Oscillator
bogdanm 0:9b334a45a8ff 62 RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_LSI | RCC_OSCILLATORTYPE_LSE;
bogdanm 0:9b334a45a8ff 63 RCC_OscInitStruct.PLL.PLLState = RCC_PLL_NONE; // Mandatory, otherwise the PLL is reconfigured!
bogdanm 0:9b334a45a8ff 64 RCC_OscInitStruct.LSEState = RCC_LSE_ON; // External 32.768 kHz clock on OSC_IN/OSC_OUT
bogdanm 0:9b334a45a8ff 65 RCC_OscInitStruct.LSIState = RCC_LSI_OFF;
bogdanm 0:9b334a45a8ff 66 if (HAL_RCC_OscConfig(&RCC_OscInitStruct) == HAL_OK) { // Check if LSE has started correctly
bogdanm 0:9b334a45a8ff 67 // Connect LSE to RTC
bogdanm 0:9b334a45a8ff 68 PeriphClkInitStruct.PeriphClockSelection = RCC_PERIPHCLK_RTC;
bogdanm 0:9b334a45a8ff 69 PeriphClkInitStruct.RTCClockSelection = RCC_RTCCLKSOURCE_LSE;
bogdanm 0:9b334a45a8ff 70 HAL_RCCEx_PeriphCLKConfig(&PeriphClkInitStruct);
bogdanm 0:9b334a45a8ff 71 rtc_freq = LSE_VALUE;
bogdanm 0:9b334a45a8ff 72 } else { // LSE didn't start, try with LSI
bogdanm 0:9b334a45a8ff 73 // Enable LSI clock
bogdanm 0:9b334a45a8ff 74 RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_LSI | RCC_OSCILLATORTYPE_LSE;
bogdanm 0:9b334a45a8ff 75 RCC_OscInitStruct.PLL.PLLState = RCC_PLL_NONE; // Mandatory, otherwise the PLL is reconfigured!
bogdanm 0:9b334a45a8ff 76 RCC_OscInitStruct.LSEState = RCC_LSE_OFF;
bogdanm 0:9b334a45a8ff 77 RCC_OscInitStruct.LSIState = RCC_LSI_ON;
bogdanm 0:9b334a45a8ff 78 if (HAL_RCC_OscConfig(&RCC_OscInitStruct) != HAL_OK) {
bogdanm 0:9b334a45a8ff 79 error("Cannot initialize RTC with LSI\n");
bogdanm 0:9b334a45a8ff 80 }
bogdanm 0:9b334a45a8ff 81 // Connect LSI to RTC
bogdanm 0:9b334a45a8ff 82 PeriphClkInitStruct.PeriphClockSelection = RCC_PERIPHCLK_RTC;
bogdanm 0:9b334a45a8ff 83 PeriphClkInitStruct.RTCClockSelection = RCC_RTCCLKSOURCE_LSI;
bogdanm 0:9b334a45a8ff 84 if (HAL_RCCEx_PeriphCLKConfig(&PeriphClkInitStruct) != HAL_OK) {
bogdanm 0:9b334a45a8ff 85 error("Cannot initialize RTC with LSI\n");
bogdanm 0:9b334a45a8ff 86 }
bogdanm 0:9b334a45a8ff 87 // This value is LSI typical value. To be measured precisely using a timer input capture for example.
bogdanm 0:9b334a45a8ff 88 rtc_freq = 40000;
bogdanm 0:9b334a45a8ff 89 }
bogdanm 0:9b334a45a8ff 90
bogdanm 0:9b334a45a8ff 91 // Enable RTC
bogdanm 0:9b334a45a8ff 92 __HAL_RCC_RTC_ENABLE();
bogdanm 0:9b334a45a8ff 93
bogdanm 0:9b334a45a8ff 94 RtcHandle.Init.HourFormat = RTC_HOURFORMAT_24;
bogdanm 0:9b334a45a8ff 95 RtcHandle.Init.AsynchPrediv = 127;
bogdanm 0:9b334a45a8ff 96 RtcHandle.Init.SynchPrediv = (rtc_freq / 128) - 1;
bogdanm 0:9b334a45a8ff 97 RtcHandle.Init.OutPut = RTC_OUTPUT_DISABLE;
bogdanm 0:9b334a45a8ff 98 RtcHandle.Init.OutPutPolarity = RTC_OUTPUT_POLARITY_HIGH;
bogdanm 0:9b334a45a8ff 99 RtcHandle.Init.OutPutType = RTC_OUTPUT_TYPE_OPENDRAIN;
bogdanm 0:9b334a45a8ff 100
bogdanm 0:9b334a45a8ff 101 if (HAL_RTC_Init(&RtcHandle) != HAL_OK) {
bogdanm 0:9b334a45a8ff 102 error("Cannot initialize RTC\n");
bogdanm 0:9b334a45a8ff 103 }
bogdanm 0:9b334a45a8ff 104 }
bogdanm 0:9b334a45a8ff 105
bogdanm 0:9b334a45a8ff 106 void rtc_free(void)
bogdanm 0:9b334a45a8ff 107 {
bogdanm 0:9b334a45a8ff 108 // Enable Power clock
bogdanm 0:9b334a45a8ff 109 __HAL_RCC_PWR_CLK_ENABLE();
bogdanm 0:9b334a45a8ff 110
bogdanm 0:9b334a45a8ff 111 // Enable access to Backup domain
bogdanm 0:9b334a45a8ff 112 HAL_PWR_EnableBkUpAccess();
bogdanm 0:9b334a45a8ff 113
bogdanm 0:9b334a45a8ff 114 // Reset Backup domain
bogdanm 0:9b334a45a8ff 115 __HAL_RCC_BACKUPRESET_FORCE();
bogdanm 0:9b334a45a8ff 116 __HAL_RCC_BACKUPRESET_RELEASE();
bogdanm 0:9b334a45a8ff 117
bogdanm 0:9b334a45a8ff 118 // Disable access to Backup domain
bogdanm 0:9b334a45a8ff 119 HAL_PWR_DisableBkUpAccess();
bogdanm 0:9b334a45a8ff 120
bogdanm 0:9b334a45a8ff 121 // Disable LSI and LSE clocks
bogdanm 0:9b334a45a8ff 122 RCC_OscInitTypeDef RCC_OscInitStruct;
bogdanm 0:9b334a45a8ff 123 RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_LSI | RCC_OSCILLATORTYPE_LSE;
bogdanm 0:9b334a45a8ff 124 RCC_OscInitStruct.PLL.PLLState = RCC_PLL_NONE;
bogdanm 0:9b334a45a8ff 125 RCC_OscInitStruct.LSIState = RCC_LSI_OFF;
bogdanm 0:9b334a45a8ff 126 RCC_OscInitStruct.LSEState = RCC_LSE_OFF;
bogdanm 0:9b334a45a8ff 127 HAL_RCC_OscConfig(&RCC_OscInitStruct);
bogdanm 0:9b334a45a8ff 128
bogdanm 0:9b334a45a8ff 129 rtc_inited = 0;
bogdanm 0:9b334a45a8ff 130 }
bogdanm 0:9b334a45a8ff 131
bogdanm 0:9b334a45a8ff 132 int rtc_isenabled(void)
bogdanm 0:9b334a45a8ff 133 {
bogdanm 0:9b334a45a8ff 134 return rtc_inited;
bogdanm 0:9b334a45a8ff 135 }
bogdanm 0:9b334a45a8ff 136
bogdanm 0:9b334a45a8ff 137 /*
bogdanm 0:9b334a45a8ff 138 RTC Registers
bogdanm 0:9b334a45a8ff 139 RTC_WeekDay 1=monday, 2=tuesday, ..., 7=sunday
bogdanm 0:9b334a45a8ff 140 RTC_Month 1=january, 2=february, ..., 12=december
bogdanm 0:9b334a45a8ff 141 RTC_Date day of the month 1-31
bogdanm 0:9b334a45a8ff 142 RTC_Year year 0-99
bogdanm 0:9b334a45a8ff 143 struct tm
bogdanm 0:9b334a45a8ff 144 tm_sec seconds after the minute 0-61
bogdanm 0:9b334a45a8ff 145 tm_min minutes after the hour 0-59
bogdanm 0:9b334a45a8ff 146 tm_hour hours since midnight 0-23
bogdanm 0:9b334a45a8ff 147 tm_mday day of the month 1-31
bogdanm 0:9b334a45a8ff 148 tm_mon months since January 0-11
bogdanm 0:9b334a45a8ff 149 tm_year years since 1900
bogdanm 0:9b334a45a8ff 150 tm_wday days since Sunday 0-6
bogdanm 0:9b334a45a8ff 151 tm_yday days since January 1 0-365
bogdanm 0:9b334a45a8ff 152 tm_isdst Daylight Saving Time flag
bogdanm 0:9b334a45a8ff 153 */
bogdanm 0:9b334a45a8ff 154 time_t rtc_read(void)
bogdanm 0:9b334a45a8ff 155 {
bogdanm 0:9b334a45a8ff 156 RTC_DateTypeDef dateStruct;
bogdanm 0:9b334a45a8ff 157 RTC_TimeTypeDef timeStruct;
bogdanm 0:9b334a45a8ff 158 struct tm timeinfo;
bogdanm 0:9b334a45a8ff 159
bogdanm 0:9b334a45a8ff 160 RtcHandle.Instance = RTC;
bogdanm 0:9b334a45a8ff 161
bogdanm 0:9b334a45a8ff 162 // Read actual date and time
bogdanm 0:9b334a45a8ff 163 // Warning: the time must be read first!
bogdanm 0:9b334a45a8ff 164 HAL_RTC_GetTime(&RtcHandle, &timeStruct, RTC_FORMAT_BIN);
bogdanm 0:9b334a45a8ff 165 HAL_RTC_GetDate(&RtcHandle, &dateStruct, RTC_FORMAT_BIN);
bogdanm 0:9b334a45a8ff 166
bogdanm 0:9b334a45a8ff 167 // Setup a tm structure based on the RTC
bogdanm 0:9b334a45a8ff 168 timeinfo.tm_wday = dateStruct.WeekDay;
bogdanm 0:9b334a45a8ff 169 timeinfo.tm_mon = dateStruct.Month - 1;
bogdanm 0:9b334a45a8ff 170 timeinfo.tm_mday = dateStruct.Date;
bogdanm 0:9b334a45a8ff 171 timeinfo.tm_year = dateStruct.Year + 100;
bogdanm 0:9b334a45a8ff 172 timeinfo.tm_hour = timeStruct.Hours;
bogdanm 0:9b334a45a8ff 173 timeinfo.tm_min = timeStruct.Minutes;
bogdanm 0:9b334a45a8ff 174 timeinfo.tm_sec = timeStruct.Seconds;
bogdanm 0:9b334a45a8ff 175
bogdanm 0:9b334a45a8ff 176 // Convert to timestamp
bogdanm 0:9b334a45a8ff 177 time_t t = mktime(&timeinfo);
bogdanm 0:9b334a45a8ff 178
bogdanm 0:9b334a45a8ff 179 return t;
bogdanm 0:9b334a45a8ff 180 }
bogdanm 0:9b334a45a8ff 181
bogdanm 0:9b334a45a8ff 182 void rtc_write(time_t t)
bogdanm 0:9b334a45a8ff 183 {
bogdanm 0:9b334a45a8ff 184 RTC_DateTypeDef dateStruct;
bogdanm 0:9b334a45a8ff 185 RTC_TimeTypeDef timeStruct;
bogdanm 0:9b334a45a8ff 186
bogdanm 0:9b334a45a8ff 187 RtcHandle.Instance = RTC;
bogdanm 0:9b334a45a8ff 188
bogdanm 0:9b334a45a8ff 189 // Convert the time into a tm
bogdanm 0:9b334a45a8ff 190 struct tm *timeinfo = localtime(&t);
bogdanm 0:9b334a45a8ff 191
bogdanm 0:9b334a45a8ff 192 // Fill RTC structures
bogdanm 0:9b334a45a8ff 193 dateStruct.WeekDay = timeinfo->tm_wday;
bogdanm 0:9b334a45a8ff 194 dateStruct.Month = timeinfo->tm_mon + 1;
bogdanm 0:9b334a45a8ff 195 dateStruct.Date = timeinfo->tm_mday;
bogdanm 0:9b334a45a8ff 196 dateStruct.Year = timeinfo->tm_year - 100;
bogdanm 0:9b334a45a8ff 197 timeStruct.Hours = timeinfo->tm_hour;
bogdanm 0:9b334a45a8ff 198 timeStruct.Minutes = timeinfo->tm_min;
bogdanm 0:9b334a45a8ff 199 timeStruct.Seconds = timeinfo->tm_sec;
bogdanm 0:9b334a45a8ff 200 timeStruct.TimeFormat = RTC_HOURFORMAT12_PM;
bogdanm 0:9b334a45a8ff 201 timeStruct.DayLightSaving = RTC_DAYLIGHTSAVING_NONE;
bogdanm 0:9b334a45a8ff 202 timeStruct.StoreOperation = RTC_STOREOPERATION_RESET;
bogdanm 0:9b334a45a8ff 203
bogdanm 0:9b334a45a8ff 204 // Change the RTC current date/time
bogdanm 0:9b334a45a8ff 205 HAL_RTC_SetDate(&RtcHandle, &dateStruct, RTC_FORMAT_BIN);
bogdanm 0:9b334a45a8ff 206 HAL_RTC_SetTime(&RtcHandle, &timeStruct, RTC_FORMAT_BIN);
bogdanm 0:9b334a45a8ff 207 }
bogdanm 0:9b334a45a8ff 208
bogdanm 0:9b334a45a8ff 209 #endif