teralytic / mbed-dev

mbed library sources. Supersedes mbed-src.

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targets/hal/TARGET_STM/TARGET_STM32L0/rtc_api.c@100:7c647ea3c13d, 2016-03-25 (annotated)

Committer:
mbed_official
Date:
Fri Mar 25 14:45:11 2016 +0000
Revision:
100:7c647ea3c13d
Child:
105:364b35371a11
Synchronized with git revision 4e40445b73e6e935b7d25568a0fab03a338b9a29



Full URL: https://github.com/mbedmicro/mbed/commit/4e40445b73e6e935b7d25568a0fab03a338b9a29/



[STM32L0] RTC update

Who changed what in which revision?

UserRevisionLine numberNew contents of line
mbed_official 100:7c647ea3c13d 1 /* mbed Microcontroller Library
mbed_official 100:7c647ea3c13d 2 *******************************************************************************
mbed_official 100:7c647ea3c13d 3 * Copyright (c) 2014, STMicroelectronics
mbed_official 100:7c647ea3c13d 4 * All rights reserved.
mbed_official 100:7c647ea3c13d 5 *
mbed_official 100:7c647ea3c13d 6 * Redistribution and use in source and binary forms, with or without
mbed_official 100:7c647ea3c13d 7 * modification, are permitted provided that the following conditions are met:
mbed_official 100:7c647ea3c13d 8 *
mbed_official 100:7c647ea3c13d 9 * 1. Redistributions of source code must retain the above copyright notice,
mbed_official 100:7c647ea3c13d 10 * this list of conditions and the following disclaimer.
mbed_official 100:7c647ea3c13d 11 * 2. Redistributions in binary form must reproduce the above copyright notice,
mbed_official 100:7c647ea3c13d 12 * this list of conditions and the following disclaimer in the documentation
mbed_official 100:7c647ea3c13d 13 * and/or other materials provided with the distribution.
mbed_official 100:7c647ea3c13d 14 * 3. Neither the name of STMicroelectronics nor the names of its contributors
mbed_official 100:7c647ea3c13d 15 * may be used to endorse or promote products derived from this software
mbed_official 100:7c647ea3c13d 16 * without specific prior written permission.
mbed_official 100:7c647ea3c13d 17 *
mbed_official 100:7c647ea3c13d 18 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
mbed_official 100:7c647ea3c13d 19 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
mbed_official 100:7c647ea3c13d 20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
mbed_official 100:7c647ea3c13d 21 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
mbed_official 100:7c647ea3c13d 22 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
mbed_official 100:7c647ea3c13d 23 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
mbed_official 100:7c647ea3c13d 24 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
mbed_official 100:7c647ea3c13d 25 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
mbed_official 100:7c647ea3c13d 26 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
mbed_official 100:7c647ea3c13d 27 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
mbed_official 100:7c647ea3c13d 28 *******************************************************************************
mbed_official 100:7c647ea3c13d 29 */
mbed_official 100:7c647ea3c13d 30 #include "rtc_api.h"
mbed_official 100:7c647ea3c13d 31
mbed_official 100:7c647ea3c13d 32 #if DEVICE_RTC
mbed_official 100:7c647ea3c13d 33
mbed_official 100:7c647ea3c13d 34 #include "mbed_error.h"
mbed_official 100:7c647ea3c13d 35
mbed_official 100:7c647ea3c13d 36 #if DEVICE_RTC_LSI
mbed_official 100:7c647ea3c13d 37 static int rtc_inited = 0;
mbed_official 100:7c647ea3c13d 38 #endif
mbed_official 100:7c647ea3c13d 39
mbed_official 100:7c647ea3c13d 40 static RTC_HandleTypeDef RtcHandle;
mbed_official 100:7c647ea3c13d 41
mbed_official 100:7c647ea3c13d 42 void rtc_init(void)
mbed_official 100:7c647ea3c13d 43 {
mbed_official 100:7c647ea3c13d 44 RCC_OscInitTypeDef RCC_OscInitStruct;
mbed_official 100:7c647ea3c13d 45 uint32_t rtc_freq = 0;
mbed_official 100:7c647ea3c13d 46
mbed_official 100:7c647ea3c13d 47 #if DEVICE_RTC_LSI
mbed_official 100:7c647ea3c13d 48 if (rtc_inited) return;
mbed_official 100:7c647ea3c13d 49 rtc_inited = 1;
mbed_official 100:7c647ea3c13d 50 #endif
mbed_official 100:7c647ea3c13d 51
mbed_official 100:7c647ea3c13d 52 RtcHandle.Instance = RTC;
mbed_official 100:7c647ea3c13d 53
mbed_official 100:7c647ea3c13d 54 // Enable Power clock
mbed_official 100:7c647ea3c13d 55 __PWR_CLK_ENABLE();
mbed_official 100:7c647ea3c13d 56
mbed_official 100:7c647ea3c13d 57 // Enable access to Backup domain
mbed_official 100:7c647ea3c13d 58 HAL_PWR_EnableBkUpAccess();
mbed_official 100:7c647ea3c13d 59
mbed_official 100:7c647ea3c13d 60 // Reset Backup domain
mbed_official 100:7c647ea3c13d 61 __HAL_RCC_BACKUPRESET_FORCE();
mbed_official 100:7c647ea3c13d 62 __HAL_RCC_BACKUPRESET_RELEASE();
mbed_official 100:7c647ea3c13d 63
mbed_official 100:7c647ea3c13d 64 #if !DEVICE_RTC_LSI
mbed_official 100:7c647ea3c13d 65 // Enable LSE Oscillator
mbed_official 100:7c647ea3c13d 66 RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_LSE;
mbed_official 100:7c647ea3c13d 67 RCC_OscInitStruct.PLL.PLLState = RCC_PLL_NONE; // Mandatory, otherwise the PLL is reconfigured!
mbed_official 100:7c647ea3c13d 68 RCC_OscInitStruct.LSEState = RCC_LSE_ON; // External 32.768 kHz clock on OSC_IN/OSC_OUT
mbed_official 100:7c647ea3c13d 69 if (HAL_RCC_OscConfig(&RCC_OscInitStruct) == HAL_OK) {
mbed_official 100:7c647ea3c13d 70 // Connect LSE to RTC
mbed_official 100:7c647ea3c13d 71 __HAL_RCC_RTC_CLKPRESCALER(RCC_RTCCLKSOURCE_LSE);
mbed_official 100:7c647ea3c13d 72 __HAL_RCC_RTC_CONFIG(RCC_RTCCLKSOURCE_LSE);
mbed_official 100:7c647ea3c13d 73 rtc_freq = LSE_VALUE;
mbed_official 100:7c647ea3c13d 74 } else {
mbed_official 100:7c647ea3c13d 75 error("Cannot initialize RTC with LSE\n");
mbed_official 100:7c647ea3c13d 76 }
mbed_official 100:7c647ea3c13d 77 #else
mbed_official 100:7c647ea3c13d 78 // Enable LSI clock
mbed_official 100:7c647ea3c13d 79 RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_LSI | RCC_OSCILLATORTYPE_LSE;
mbed_official 100:7c647ea3c13d 80 RCC_OscInitStruct.PLL.PLLState = RCC_PLL_NONE; // Mandatory, otherwise the PLL is reconfigured!
mbed_official 100:7c647ea3c13d 81 RCC_OscInitStruct.LSEState = RCC_LSE_OFF;
mbed_official 100:7c647ea3c13d 82 RCC_OscInitStruct.LSIState = RCC_LSI_ON;
mbed_official 100:7c647ea3c13d 83 if (HAL_RCC_OscConfig(&RCC_OscInitStruct) != HAL_OK) {
mbed_official 100:7c647ea3c13d 84 error("RTC error: LSI clock initialization failed.");
mbed_official 100:7c647ea3c13d 85 }
mbed_official 100:7c647ea3c13d 86 // Connect LSI to RTC
mbed_official 100:7c647ea3c13d 87 __HAL_RCC_RTC_CLKPRESCALER(RCC_RTCCLKSOURCE_LSI);
mbed_official 100:7c647ea3c13d 88 __HAL_RCC_RTC_CONFIG(RCC_RTCCLKSOURCE_LSI);
mbed_official 100:7c647ea3c13d 89 // This value is LSI typical value. To be measured precisely using a timer input capture for example.
mbed_official 100:7c647ea3c13d 90 rtc_freq = 38000;
mbed_official 100:7c647ea3c13d 91 #endif
mbed_official 100:7c647ea3c13d 92
mbed_official 100:7c647ea3c13d 93 // Enable RTC
mbed_official 100:7c647ea3c13d 94 __HAL_RCC_RTC_ENABLE();
mbed_official 100:7c647ea3c13d 95
mbed_official 100:7c647ea3c13d 96 RtcHandle.Init.HourFormat = RTC_HOURFORMAT_24;
mbed_official 100:7c647ea3c13d 97 RtcHandle.Init.AsynchPrediv = 127;
mbed_official 100:7c647ea3c13d 98 RtcHandle.Init.SynchPrediv = (rtc_freq / 128) - 1;
mbed_official 100:7c647ea3c13d 99 RtcHandle.Init.OutPut = RTC_OUTPUT_DISABLE;
mbed_official 100:7c647ea3c13d 100 RtcHandle.Init.OutPutPolarity = RTC_OUTPUT_POLARITY_HIGH;
mbed_official 100:7c647ea3c13d 101 RtcHandle.Init.OutPutType = RTC_OUTPUT_TYPE_OPENDRAIN;
mbed_official 100:7c647ea3c13d 102
mbed_official 100:7c647ea3c13d 103 if (HAL_RTC_Init(&RtcHandle) != HAL_OK) {
mbed_official 100:7c647ea3c13d 104 error("RTC error: RTC initialization failed.");
mbed_official 100:7c647ea3c13d 105 }
mbed_official 100:7c647ea3c13d 106 }
mbed_official 100:7c647ea3c13d 107
mbed_official 100:7c647ea3c13d 108 void rtc_free(void)
mbed_official 100:7c647ea3c13d 109 {
mbed_official 100:7c647ea3c13d 110 // Enable Power clock
mbed_official 100:7c647ea3c13d 111 __PWR_CLK_ENABLE();
mbed_official 100:7c647ea3c13d 112
mbed_official 100:7c647ea3c13d 113 // Enable access to Backup domain
mbed_official 100:7c647ea3c13d 114 HAL_PWR_EnableBkUpAccess();
mbed_official 100:7c647ea3c13d 115
mbed_official 100:7c647ea3c13d 116 // Reset Backup domain
mbed_official 100:7c647ea3c13d 117 __HAL_RCC_BACKUPRESET_FORCE();
mbed_official 100:7c647ea3c13d 118 __HAL_RCC_BACKUPRESET_RELEASE();
mbed_official 100:7c647ea3c13d 119
mbed_official 100:7c647ea3c13d 120 // Disable access to Backup domain
mbed_official 100:7c647ea3c13d 121 HAL_PWR_DisableBkUpAccess();
mbed_official 100:7c647ea3c13d 122
mbed_official 100:7c647ea3c13d 123 // Disable LSI and LSE clocks
mbed_official 100:7c647ea3c13d 124 RCC_OscInitTypeDef RCC_OscInitStruct;
mbed_official 100:7c647ea3c13d 125 RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_LSI | RCC_OSCILLATORTYPE_LSE;
mbed_official 100:7c647ea3c13d 126 RCC_OscInitStruct.PLL.PLLState = RCC_PLL_NONE;
mbed_official 100:7c647ea3c13d 127 RCC_OscInitStruct.LSIState = RCC_LSI_OFF;
mbed_official 100:7c647ea3c13d 128 RCC_OscInitStruct.LSEState = RCC_LSE_OFF;
mbed_official 100:7c647ea3c13d 129 HAL_RCC_OscConfig(&RCC_OscInitStruct);
mbed_official 100:7c647ea3c13d 130
mbed_official 100:7c647ea3c13d 131 #if DEVICE_RTC_LSI
mbed_official 100:7c647ea3c13d 132 rtc_inited = 0;
mbed_official 100:7c647ea3c13d 133 #endif
mbed_official 100:7c647ea3c13d 134 }
mbed_official 100:7c647ea3c13d 135
mbed_official 100:7c647ea3c13d 136 int rtc_isenabled(void)
mbed_official 100:7c647ea3c13d 137 {
mbed_official 100:7c647ea3c13d 138 #if DEVICE_RTC_LSI
mbed_official 100:7c647ea3c13d 139 return rtc_inited;
mbed_official 100:7c647ea3c13d 140 #else
mbed_official 100:7c647ea3c13d 141 if ((RTC->ISR & RTC_ISR_INITS) == RTC_ISR_INITS) {
mbed_official 100:7c647ea3c13d 142 return 1;
mbed_official 100:7c647ea3c13d 143 } else {
mbed_official 100:7c647ea3c13d 144 return 0;
mbed_official 100:7c647ea3c13d 145 }
mbed_official 100:7c647ea3c13d 146 #endif
mbed_official 100:7c647ea3c13d 147 }
mbed_official 100:7c647ea3c13d 148
mbed_official 100:7c647ea3c13d 149 /*
mbed_official 100:7c647ea3c13d 150 RTC Registers
mbed_official 100:7c647ea3c13d 151 RTC_WeekDay 1=monday, 2=tuesday, ..., 7=sunday
mbed_official 100:7c647ea3c13d 152 RTC_Month 1=january, 2=february, ..., 12=december
mbed_official 100:7c647ea3c13d 153 RTC_Date day of the month 1-31
mbed_official 100:7c647ea3c13d 154 RTC_Year year 0-99
mbed_official 100:7c647ea3c13d 155 struct tm
mbed_official 100:7c647ea3c13d 156 tm_sec seconds after the minute 0-61
mbed_official 100:7c647ea3c13d 157 tm_min minutes after the hour 0-59
mbed_official 100:7c647ea3c13d 158 tm_hour hours since midnight 0-23
mbed_official 100:7c647ea3c13d 159 tm_mday day of the month 1-31
mbed_official 100:7c647ea3c13d 160 tm_mon months since January 0-11
mbed_official 100:7c647ea3c13d 161 tm_year years since 1900
mbed_official 100:7c647ea3c13d 162 tm_wday days since Sunday 0-6
mbed_official 100:7c647ea3c13d 163 tm_yday days since January 1 0-365
mbed_official 100:7c647ea3c13d 164 tm_isdst Daylight Saving Time flag
mbed_official 100:7c647ea3c13d 165 */
mbed_official 100:7c647ea3c13d 166 time_t rtc_read(void)
mbed_official 100:7c647ea3c13d 167 {
mbed_official 100:7c647ea3c13d 168 RTC_DateTypeDef dateStruct;
mbed_official 100:7c647ea3c13d 169 RTC_TimeTypeDef timeStruct;
mbed_official 100:7c647ea3c13d 170 struct tm timeinfo;
mbed_official 100:7c647ea3c13d 171
mbed_official 100:7c647ea3c13d 172 RtcHandle.Instance = RTC;
mbed_official 100:7c647ea3c13d 173
mbed_official 100:7c647ea3c13d 174 // Read actual date and time
mbed_official 100:7c647ea3c13d 175 // Warning: the time must be read first!
mbed_official 100:7c647ea3c13d 176 HAL_RTC_GetTime(&RtcHandle, &timeStruct, FORMAT_BIN);
mbed_official 100:7c647ea3c13d 177 HAL_RTC_GetDate(&RtcHandle, &dateStruct, FORMAT_BIN);
mbed_official 100:7c647ea3c13d 178
mbed_official 100:7c647ea3c13d 179 // Setup a tm structure based on the RTC
mbed_official 100:7c647ea3c13d 180 timeinfo.tm_wday = dateStruct.WeekDay;
mbed_official 100:7c647ea3c13d 181 timeinfo.tm_mon = dateStruct.Month - 1;
mbed_official 100:7c647ea3c13d 182 timeinfo.tm_mday = dateStruct.Date;
mbed_official 100:7c647ea3c13d 183 timeinfo.tm_year = dateStruct.Year + 100;
mbed_official 100:7c647ea3c13d 184 timeinfo.tm_hour = timeStruct.Hours;
mbed_official 100:7c647ea3c13d 185 timeinfo.tm_min = timeStruct.Minutes;
mbed_official 100:7c647ea3c13d 186 timeinfo.tm_sec = timeStruct.Seconds;
mbed_official 100:7c647ea3c13d 187
mbed_official 100:7c647ea3c13d 188 // Convert to timestamp
mbed_official 100:7c647ea3c13d 189 time_t t = mktime(&timeinfo);
mbed_official 100:7c647ea3c13d 190
mbed_official 100:7c647ea3c13d 191 return t;
mbed_official 100:7c647ea3c13d 192 }
mbed_official 100:7c647ea3c13d 193
mbed_official 100:7c647ea3c13d 194 void rtc_write(time_t t)
mbed_official 100:7c647ea3c13d 195 {
mbed_official 100:7c647ea3c13d 196 RTC_DateTypeDef dateStruct;
mbed_official 100:7c647ea3c13d 197 RTC_TimeTypeDef timeStruct;
mbed_official 100:7c647ea3c13d 198
mbed_official 100:7c647ea3c13d 199 RtcHandle.Instance = RTC;
mbed_official 100:7c647ea3c13d 200
mbed_official 100:7c647ea3c13d 201 // Convert the time into a tm
mbed_official 100:7c647ea3c13d 202 struct tm *timeinfo = localtime(&t);
mbed_official 100:7c647ea3c13d 203
mbed_official 100:7c647ea3c13d 204 // Fill RTC structures
mbed_official 100:7c647ea3c13d 205 dateStruct.WeekDay = timeinfo->tm_wday;
mbed_official 100:7c647ea3c13d 206 dateStruct.Month = timeinfo->tm_mon + 1;
mbed_official 100:7c647ea3c13d 207 dateStruct.Date = timeinfo->tm_mday;
mbed_official 100:7c647ea3c13d 208 dateStruct.Year = timeinfo->tm_year - 100;
mbed_official 100:7c647ea3c13d 209 timeStruct.Hours = timeinfo->tm_hour;
mbed_official 100:7c647ea3c13d 210 timeStruct.Minutes = timeinfo->tm_min;
mbed_official 100:7c647ea3c13d 211 timeStruct.Seconds = timeinfo->tm_sec;
mbed_official 100:7c647ea3c13d 212 timeStruct.TimeFormat = RTC_HOURFORMAT12_PM;
mbed_official 100:7c647ea3c13d 213 timeStruct.DayLightSaving = RTC_DAYLIGHTSAVING_NONE;
mbed_official 100:7c647ea3c13d 214 timeStruct.StoreOperation = RTC_STOREOPERATION_RESET;
mbed_official 100:7c647ea3c13d 215
mbed_official 100:7c647ea3c13d 216 // Change the RTC current date/time
mbed_official 100:7c647ea3c13d 217 HAL_RTC_SetDate(&RtcHandle, &dateStruct, FORMAT_BIN);
mbed_official 100:7c647ea3c13d 218 HAL_RTC_SetTime(&RtcHandle, &timeStruct, FORMAT_BIN);
mbed_official 100:7c647ea3c13d 219 }
mbed_official 100:7c647ea3c13d 220
mbed_official 100:7c647ea3c13d 221 #endif