Toyomasa Watarai / mbed-dev-lpcx1769

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Dependents:   LPCXpresso1769_blinky

Fork of mbed-dev by mbed official

targets/hal/TARGET_STM/TARGET_STM32F7/rtc_api.c@74:9322579e4309, 2016-02-26 (annotated)

Committer:
mbed_official
Date:
Fri Feb 26 11:45:10 2016 +0000
Revision:
74:9322579e4309
Parent:
70:885f1c2f67b1
Child:
78:fcc37a1ad8f5
Synchronized with git revision 121804a99d058122097dc72cb02236fa317a1cb4



Full URL: https://github.com/mbedmicro/mbed/commit/121804a99d058122097dc72cb02236fa317a1cb4/

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 RTC_HandleTypeDef RtcHandle;
bogdanm 0:9b334a45a8ff 37
bogdanm 0:9b334a45a8ff 38 void rtc_init(void)
bogdanm 0:9b334a45a8ff 39 {
bogdanm 0:9b334a45a8ff 40 RCC_OscInitTypeDef RCC_OscInitStruct;
bogdanm 0:9b334a45a8ff 41 uint32_t rtc_freq = 0;
bogdanm 0:9b334a45a8ff 42
mbed_official 74:9322579e4309 43 RtcHandle.Instance = RTC;
mbed_official 4:4a8e88c1ef9e 44
mbed_official 74:9322579e4309 45 // Enable Power clock
mbed_official 74:9322579e4309 46 __PWR_CLK_ENABLE();
bogdanm 0:9b334a45a8ff 47
mbed_official 74:9322579e4309 48 // Enable access to Backup domain
mbed_official 74:9322579e4309 49 HAL_PWR_EnableBkUpAccess();
mbed_official 74:9322579e4309 50
mbed_official 74:9322579e4309 51 // Reset Backup domain
mbed_official 74:9322579e4309 52 __HAL_RCC_BACKUPRESET_FORCE();
mbed_official 74:9322579e4309 53 __HAL_RCC_BACKUPRESET_RELEASE();
mbed_official 74:9322579e4309 54
mbed_official 74:9322579e4309 55 // Enable LSE Oscillator
mbed_official 74:9322579e4309 56 RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_LSE;
bogdanm 0:9b334a45a8ff 57 RCC_OscInitStruct.PLL.PLLState = RCC_PLL_NONE; // Mandatory, otherwise the PLL is reconfigured!
mbed_official 74:9322579e4309 58 RCC_OscInitStruct.LSEState = RCC_LSE_ON; // External 32.768 kHz clock on OSC_IN/OSC_OUT
mbed_official 74:9322579e4309 59 if (HAL_RCC_OscConfig(&RCC_OscInitStruct) == HAL_OK) {
mbed_official 74:9322579e4309 60 // Connect LSE to RTC
mbed_official 74:9322579e4309 61 __HAL_RCC_RTC_CLKPRESCALER(RCC_RTCCLKSOURCE_LSE);
mbed_official 74:9322579e4309 62 __HAL_RCC_RTC_CONFIG(RCC_RTCCLKSOURCE_LSE);
mbed_official 74:9322579e4309 63 rtc_freq = LSE_VALUE;
mbed_official 74:9322579e4309 64 } else {
mbed_official 74:9322579e4309 65 // Enable LSI clock
mbed_official 74:9322579e4309 66 RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_LSI | RCC_OSCILLATORTYPE_LSE;
mbed_official 74:9322579e4309 67 RCC_OscInitStruct.PLL.PLLState = RCC_PLL_NONE; // Mandatory, otherwise the PLL is reconfigured!
mbed_official 74:9322579e4309 68 RCC_OscInitStruct.LSEState = RCC_LSE_OFF;
mbed_official 74:9322579e4309 69 RCC_OscInitStruct.LSIState = RCC_LSI_ON;
mbed_official 74:9322579e4309 70 if (HAL_RCC_OscConfig(&RCC_OscInitStruct) != HAL_OK) {
mbed_official 74:9322579e4309 71 error("RTC error: LSI clock initialization failed.");
mbed_official 74:9322579e4309 72 }
mbed_official 74:9322579e4309 73 // Connect LSI to RTC
mbed_official 74:9322579e4309 74 __HAL_RCC_RTC_CLKPRESCALER(RCC_RTCCLKSOURCE_LSI);
mbed_official 74:9322579e4309 75 __HAL_RCC_RTC_CONFIG(RCC_RTCCLKSOURCE_LSI);
mbed_official 74:9322579e4309 76 // [TODO] This value is LSI typical value. To be measured precisely using a timer input capture
mbed_official 74:9322579e4309 77 rtc_freq = LSI_VALUE;
bogdanm 0:9b334a45a8ff 78 }
mbed_official 48:b854a29e778d 79
mbed_official 74:9322579e4309 80 if((RTC->ISR & RTC_ISR_INITS) == RTC_ISR_INITS) { // RTC initialization and status register (RTC_ISR), cold start (with no backup domain power) RTC reset value
bogdanm 0:9b334a45a8ff 81
mbed_official 74:9322579e4309 82 // Enable RTC
mbed_official 74:9322579e4309 83 __HAL_RCC_RTC_ENABLE();
bogdanm 0:9b334a45a8ff 84
mbed_official 74:9322579e4309 85 RtcHandle.Init.HourFormat = RTC_HOURFORMAT_24;
mbed_official 74:9322579e4309 86 RtcHandle.Init.AsynchPrediv = 127;
mbed_official 74:9322579e4309 87 RtcHandle.Init.SynchPrediv = (rtc_freq / 128) - 1;
mbed_official 74:9322579e4309 88 RtcHandle.Init.OutPut = RTC_OUTPUT_DISABLE;
mbed_official 74:9322579e4309 89 RtcHandle.Init.OutPutPolarity = RTC_OUTPUT_POLARITY_HIGH;
mbed_official 74:9322579e4309 90 RtcHandle.Init.OutPutType = RTC_OUTPUT_TYPE_OPENDRAIN;
mbed_official 4:4a8e88c1ef9e 91
mbed_official 74:9322579e4309 92 if (HAL_RTC_Init(&RtcHandle) != HAL_OK) {
mbed_official 74:9322579e4309 93 error("RTC error: RTC initialization failed.");
mbed_official 74:9322579e4309 94 }
mbed_official 74:9322579e4309 95
bogdanm 0:9b334a45a8ff 96 }
bogdanm 0:9b334a45a8ff 97 }
bogdanm 0:9b334a45a8ff 98
bogdanm 0:9b334a45a8ff 99 void rtc_free(void)
bogdanm 0:9b334a45a8ff 100 {
bogdanm 0:9b334a45a8ff 101 // Enable Power clock
bogdanm 0:9b334a45a8ff 102 __PWR_CLK_ENABLE();
bogdanm 0:9b334a45a8ff 103
bogdanm 0:9b334a45a8ff 104 // Enable access to Backup domain
bogdanm 0:9b334a45a8ff 105 HAL_PWR_EnableBkUpAccess();
bogdanm 0:9b334a45a8ff 106
bogdanm 0:9b334a45a8ff 107 // Reset Backup domain
bogdanm 0:9b334a45a8ff 108 __HAL_RCC_BACKUPRESET_FORCE();
bogdanm 0:9b334a45a8ff 109 __HAL_RCC_BACKUPRESET_RELEASE();
bogdanm 0:9b334a45a8ff 110
bogdanm 0:9b334a45a8ff 111 // Disable access to Backup domain
bogdanm 0:9b334a45a8ff 112 HAL_PWR_DisableBkUpAccess();
bogdanm 0:9b334a45a8ff 113
bogdanm 0:9b334a45a8ff 114 // Disable LSI and LSE clocks
bogdanm 0:9b334a45a8ff 115 RCC_OscInitTypeDef RCC_OscInitStruct;
bogdanm 0:9b334a45a8ff 116 RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_LSI | RCC_OSCILLATORTYPE_LSE;
bogdanm 0:9b334a45a8ff 117 RCC_OscInitStruct.PLL.PLLState = RCC_PLL_NONE;
bogdanm 0:9b334a45a8ff 118 RCC_OscInitStruct.LSIState = RCC_LSI_OFF;
bogdanm 0:9b334a45a8ff 119 RCC_OscInitStruct.LSEState = RCC_LSE_OFF;
bogdanm 0:9b334a45a8ff 120 HAL_RCC_OscConfig(&RCC_OscInitStruct);
bogdanm 0:9b334a45a8ff 121 }
bogdanm 0:9b334a45a8ff 122
bogdanm 0:9b334a45a8ff 123 int rtc_isenabled(void)
bogdanm 0:9b334a45a8ff 124 {
mbed_official 4:4a8e88c1ef9e 125 if(RTC->ISR != 7) {
mbed_official 4:4a8e88c1ef9e 126 return 1;
mbed_official 4:4a8e88c1ef9e 127 } else {
mbed_official 4:4a8e88c1ef9e 128 return 0;
mbed_official 4:4a8e88c1ef9e 129 }
bogdanm 0:9b334a45a8ff 130 }
bogdanm 0:9b334a45a8ff 131
bogdanm 0:9b334a45a8ff 132 /*
bogdanm 0:9b334a45a8ff 133 RTC Registers
bogdanm 0:9b334a45a8ff 134 RTC_WeekDay 1=monday, 2=tuesday, ..., 7=sunday
bogdanm 0:9b334a45a8ff 135 RTC_Month 1=january, 2=february, ..., 12=december
bogdanm 0:9b334a45a8ff 136 RTC_Date day of the month 1-31
bogdanm 0:9b334a45a8ff 137 RTC_Year year 0-99
bogdanm 0:9b334a45a8ff 138 struct tm
bogdanm 0:9b334a45a8ff 139 tm_sec seconds after the minute 0-61
bogdanm 0:9b334a45a8ff 140 tm_min minutes after the hour 0-59
bogdanm 0:9b334a45a8ff 141 tm_hour hours since midnight 0-23
bogdanm 0:9b334a45a8ff 142 tm_mday day of the month 1-31
bogdanm 0:9b334a45a8ff 143 tm_mon months since January 0-11
bogdanm 0:9b334a45a8ff 144 tm_year years since 1900
bogdanm 0:9b334a45a8ff 145 tm_wday days since Sunday 0-6
bogdanm 0:9b334a45a8ff 146 tm_yday days since January 1 0-365
bogdanm 0:9b334a45a8ff 147 tm_isdst Daylight Saving Time flag
bogdanm 0:9b334a45a8ff 148 */
bogdanm 0:9b334a45a8ff 149 time_t rtc_read(void)
bogdanm 0:9b334a45a8ff 150 {
bogdanm 0:9b334a45a8ff 151 RTC_DateTypeDef dateStruct;
bogdanm 0:9b334a45a8ff 152 RTC_TimeTypeDef timeStruct;
bogdanm 0:9b334a45a8ff 153 struct tm timeinfo;
bogdanm 0:9b334a45a8ff 154
bogdanm 0:9b334a45a8ff 155 RtcHandle.Instance = RTC;
bogdanm 0:9b334a45a8ff 156
bogdanm 0:9b334a45a8ff 157 // Read actual date and time
bogdanm 0:9b334a45a8ff 158 // Warning: the time must be read first!
bogdanm 0:9b334a45a8ff 159 HAL_RTC_GetTime(&RtcHandle, &timeStruct, FORMAT_BIN);
bogdanm 0:9b334a45a8ff 160 HAL_RTC_GetDate(&RtcHandle, &dateStruct, FORMAT_BIN);
bogdanm 0:9b334a45a8ff 161
bogdanm 0:9b334a45a8ff 162 // Setup a tm structure based on the RTC
bogdanm 0:9b334a45a8ff 163 timeinfo.tm_wday = dateStruct.WeekDay;
bogdanm 0:9b334a45a8ff 164 timeinfo.tm_mon = dateStruct.Month - 1;
bogdanm 0:9b334a45a8ff 165 timeinfo.tm_mday = dateStruct.Date;
bogdanm 0:9b334a45a8ff 166 timeinfo.tm_year = dateStruct.Year + 100;
bogdanm 0:9b334a45a8ff 167 timeinfo.tm_hour = timeStruct.Hours;
bogdanm 0:9b334a45a8ff 168 timeinfo.tm_min = timeStruct.Minutes;
bogdanm 0:9b334a45a8ff 169 timeinfo.tm_sec = timeStruct.Seconds;
bogdanm 0:9b334a45a8ff 170
bogdanm 0:9b334a45a8ff 171 // Convert to timestamp
bogdanm 0:9b334a45a8ff 172 time_t t = mktime(&timeinfo);
bogdanm 0:9b334a45a8ff 173
bogdanm 0:9b334a45a8ff 174 return t;
bogdanm 0:9b334a45a8ff 175 }
bogdanm 0:9b334a45a8ff 176
bogdanm 0:9b334a45a8ff 177 void rtc_write(time_t t)
bogdanm 0:9b334a45a8ff 178 {
bogdanm 0:9b334a45a8ff 179 RTC_DateTypeDef dateStruct;
bogdanm 0:9b334a45a8ff 180 RTC_TimeTypeDef timeStruct;
bogdanm 0:9b334a45a8ff 181
bogdanm 0:9b334a45a8ff 182 RtcHandle.Instance = RTC;
bogdanm 0:9b334a45a8ff 183
mbed_official 4:4a8e88c1ef9e 184 // Enable write access to Backup domain
mbed_official 4:4a8e88c1ef9e 185 HAL_PWR_EnableBkUpAccess();
mbed_official 4:4a8e88c1ef9e 186
bogdanm 0:9b334a45a8ff 187 // Convert the time into a tm
bogdanm 0:9b334a45a8ff 188 struct tm *timeinfo = localtime(&t);
bogdanm 0:9b334a45a8ff 189
bogdanm 0:9b334a45a8ff 190 // Fill RTC structures
bogdanm 0:9b334a45a8ff 191 dateStruct.WeekDay = timeinfo->tm_wday;
bogdanm 0:9b334a45a8ff 192 dateStruct.Month = timeinfo->tm_mon + 1;
bogdanm 0:9b334a45a8ff 193 dateStruct.Date = timeinfo->tm_mday;
bogdanm 0:9b334a45a8ff 194 dateStruct.Year = timeinfo->tm_year - 100;
bogdanm 0:9b334a45a8ff 195 timeStruct.Hours = timeinfo->tm_hour;
bogdanm 0:9b334a45a8ff 196 timeStruct.Minutes = timeinfo->tm_min;
bogdanm 0:9b334a45a8ff 197 timeStruct.Seconds = timeinfo->tm_sec;
bogdanm 0:9b334a45a8ff 198 timeStruct.TimeFormat = RTC_HOURFORMAT12_PM;
bogdanm 0:9b334a45a8ff 199 timeStruct.DayLightSaving = RTC_DAYLIGHTSAVING_NONE;
bogdanm 0:9b334a45a8ff 200 timeStruct.StoreOperation = RTC_STOREOPERATION_RESET;
bogdanm 0:9b334a45a8ff 201
bogdanm 0:9b334a45a8ff 202 // Change the RTC current date/time
bogdanm 0:9b334a45a8ff 203 HAL_RTC_SetDate(&RtcHandle, &dateStruct, FORMAT_BIN);
bogdanm 0:9b334a45a8ff 204 HAL_RTC_SetTime(&RtcHandle, &timeStruct, FORMAT_BIN);
bogdanm 0:9b334a45a8ff 205 }
bogdanm 0:9b334a45a8ff 206
bogdanm 0:9b334a45a8ff 207 #endif