rik te winkel / mbed-dev

Forked mbed-dev as I use an 20 pins stm32F042 and not the 32 pins version

Dependents:   Numitron_clock

Fork of mbed-dev by mbed official

targets/TARGET_STM/TARGET_STM32F2/rtc_api.c@153:0a78729d3229, 2017-01-22 (annotated)

Committer:
riktw
Date:
Sun Jan 22 22:20:36 2017 +0000
Revision:
153:0a78729d3229
Parent:
149:156823d33999 
Back to 8Mhz clock. Revision 1.0

Who changed what in which revision?

UserRevisionLine numberNew contents of line
<> 149:156823d33999 1 /* mbed Microcontroller Library
<> 149:156823d33999 2 *******************************************************************************
<> 149:156823d33999 3 * Copyright (c) 2016, STMicroelectronics
<> 149:156823d33999 4 * All rights reserved.
<> 149:156823d33999 5 *
<> 149:156823d33999 6 * Redistribution and use in source and binary forms, with or without
<> 149:156823d33999 7 * modification, are permitted provided that the following conditions are met:
<> 149:156823d33999 8 *
<> 149:156823d33999 9 * 1. Redistributions of source code must retain the above copyright notice,
<> 149:156823d33999 10 * this list of conditions and the following disclaimer.
<> 149:156823d33999 11 * 2. Redistributions in binary form must reproduce the above copyright notice,
<> 149:156823d33999 12 * this list of conditions and the following disclaimer in the documentation
<> 149:156823d33999 13 * and/or other materials provided with the distribution.
<> 149:156823d33999 14 * 3. Neither the name of STMicroelectronics nor the names of its contributors
<> 149:156823d33999 15 * may be used to endorse or promote products derived from this software
<> 149:156823d33999 16 * without specific prior written permission.
<> 149:156823d33999 17 *
<> 149:156823d33999 18 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
<> 149:156823d33999 19 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
<> 149:156823d33999 20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
<> 149:156823d33999 21 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
<> 149:156823d33999 22 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
<> 149:156823d33999 23 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
<> 149:156823d33999 24 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
<> 149:156823d33999 25 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
<> 149:156823d33999 26 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
<> 149:156823d33999 27 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
<> 149:156823d33999 28 *******************************************************************************
<> 149:156823d33999 29 */
<> 149:156823d33999 30 #include "rtc_api.h"
<> 149:156823d33999 31
<> 149:156823d33999 32 #if DEVICE_RTC
<> 149:156823d33999 33
<> 149:156823d33999 34 #include "mbed_error.h"
<> 149:156823d33999 35
<> 149:156823d33999 36 #if RTC_LSI
<> 149:156823d33999 37 static int rtc_inited = 0;
<> 149:156823d33999 38 #endif
<> 149:156823d33999 39
<> 149:156823d33999 40 static RTC_HandleTypeDef RtcHandle;
<> 149:156823d33999 41
<> 149:156823d33999 42 void rtc_init(void)
<> 149:156823d33999 43 {
<> 149:156823d33999 44 RCC_OscInitTypeDef RCC_OscInitStruct;
<> 149:156823d33999 45 uint32_t rtc_freq = 0;
<> 149:156823d33999 46
<> 149:156823d33999 47 #if RTC_LSI
<> 149:156823d33999 48 rtc_inited = 1;
<> 149:156823d33999 49 #endif
<> 149:156823d33999 50
<> 149:156823d33999 51 RtcHandle.Instance = RTC;
<> 149:156823d33999 52
<> 149:156823d33999 53 #if !RTC_LSI
<> 149:156823d33999 54 // Enable LSE Oscillator
<> 149:156823d33999 55 RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_LSE;
<> 149:156823d33999 56 RCC_OscInitStruct.PLL.PLLState = RCC_PLL_NONE; /* Mandatory, otherwise the PLL is reconfigured! */
<> 149:156823d33999 57 RCC_OscInitStruct.LSEState = RCC_LSE_ON; /* External 32.768 kHz clock on OSC_IN/OSC_OUT */
<> 149:156823d33999 58 if (HAL_RCC_OscConfig(&RCC_OscInitStruct) == HAL_OK) {
<> 149:156823d33999 59 // Connect LSE to RTC
<> 149:156823d33999 60 __HAL_RCC_RTC_CLKPRESCALER(RCC_RTCCLKSOURCE_LSE);
<> 149:156823d33999 61 __HAL_RCC_RTC_CONFIG(RCC_RTCCLKSOURCE_LSE);
<> 149:156823d33999 62 rtc_freq = LSE_VALUE;
<> 149:156823d33999 63 } else {
<> 149:156823d33999 64 error("RTC error: LSE clock initialization failed.");
<> 149:156823d33999 65 }
<> 149:156823d33999 66 #else
<> 149:156823d33999 67 // Enable Power clock
<> 149:156823d33999 68 __PWR_CLK_ENABLE();
<> 149:156823d33999 69
<> 149:156823d33999 70 // Enable access to Backup domain
<> 149:156823d33999 71 HAL_PWR_EnableBkUpAccess();
<> 149:156823d33999 72
<> 149:156823d33999 73 // Reset Backup domain
<> 149:156823d33999 74 __HAL_RCC_BACKUPRESET_FORCE();
<> 149:156823d33999 75 __HAL_RCC_BACKUPRESET_RELEASE();
<> 149:156823d33999 76
<> 149:156823d33999 77 // Enable LSI clock
<> 149:156823d33999 78 RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_LSI | RCC_OSCILLATORTYPE_LSE;
<> 149:156823d33999 79 RCC_OscInitStruct.PLL.PLLState = RCC_PLL_NONE; // Mandatory, otherwise the PLL is reconfigured!
<> 149:156823d33999 80 RCC_OscInitStruct.LSEState = RCC_LSE_OFF;
<> 149:156823d33999 81 RCC_OscInitStruct.LSIState = RCC_LSI_ON;
<> 149:156823d33999 82 if (HAL_RCC_OscConfig(&RCC_OscInitStruct) != HAL_OK) {
<> 149:156823d33999 83 error("RTC error: LSI clock initialization failed.");
<> 149:156823d33999 84 }
<> 149:156823d33999 85 // Connect LSI to RTC
<> 149:156823d33999 86 __HAL_RCC_RTC_CLKPRESCALER(RCC_RTCCLKSOURCE_LSI);
<> 149:156823d33999 87 __HAL_RCC_RTC_CONFIG(RCC_RTCCLKSOURCE_LSI);
<> 149:156823d33999 88 // [TODO] This value is LSI typical value. To be measured precisely using a timer input capture
<> 149:156823d33999 89 rtc_freq = LSI_VALUE;
<> 149:156823d33999 90 #endif
<> 149:156823d33999 91
<> 149:156823d33999 92 // Enable RTC
<> 149:156823d33999 93 __HAL_RCC_RTC_ENABLE();
<> 149:156823d33999 94
<> 149:156823d33999 95 RtcHandle.Init.HourFormat = RTC_HOURFORMAT_24;
<> 149:156823d33999 96 RtcHandle.Init.AsynchPrediv = 127;
<> 149:156823d33999 97 RtcHandle.Init.SynchPrediv = (rtc_freq / 128) - 1;
<> 149:156823d33999 98 RtcHandle.Init.OutPut = RTC_OUTPUT_DISABLE;
<> 149:156823d33999 99 RtcHandle.Init.OutPutPolarity = RTC_OUTPUT_POLARITY_HIGH;
<> 149:156823d33999 100 RtcHandle.Init.OutPutType = RTC_OUTPUT_TYPE_OPENDRAIN;
<> 149:156823d33999 101
<> 149:156823d33999 102 if (HAL_RTC_Init(&RtcHandle) != HAL_OK) {
<> 149:156823d33999 103 error("RTC error: RTC initialization failed.");
<> 149:156823d33999 104 }
<> 149:156823d33999 105 }
<> 149:156823d33999 106
<> 149:156823d33999 107 void rtc_free(void)
<> 149:156823d33999 108 {
<> 149:156823d33999 109 #if RTC_LSI
<> 149:156823d33999 110 // Enable Power clock
<> 149:156823d33999 111 __PWR_CLK_ENABLE();
<> 149:156823d33999 112
<> 149:156823d33999 113 // Enable access to Backup domain
<> 149:156823d33999 114 HAL_PWR_EnableBkUpAccess();
<> 149:156823d33999 115
<> 149:156823d33999 116 // Reset Backup domain
<> 149:156823d33999 117 __HAL_RCC_BACKUPRESET_FORCE();
<> 149:156823d33999 118 __HAL_RCC_BACKUPRESET_RELEASE();
<> 149:156823d33999 119
<> 149:156823d33999 120 // Disable access to Backup domain
<> 149:156823d33999 121 HAL_PWR_DisableBkUpAccess();
<> 149:156823d33999 122 #endif
<> 149:156823d33999 123
<> 149:156823d33999 124 // Disable LSI and LSE clocks
<> 149:156823d33999 125 RCC_OscInitTypeDef RCC_OscInitStruct;
<> 149:156823d33999 126 RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_LSI | RCC_OSCILLATORTYPE_LSE;
<> 149:156823d33999 127 RCC_OscInitStruct.PLL.PLLState = RCC_PLL_NONE;
<> 149:156823d33999 128 RCC_OscInitStruct.LSIState = RCC_LSI_OFF;
<> 149:156823d33999 129 RCC_OscInitStruct.LSEState = RCC_LSE_OFF;
<> 149:156823d33999 130 HAL_RCC_OscConfig(&RCC_OscInitStruct);
<> 149:156823d33999 131 #if RTC_LSI
<> 149:156823d33999 132 rtc_inited = 0;
<> 149:156823d33999 133 #endif
<> 149:156823d33999 134 }
<> 149:156823d33999 135
<> 149:156823d33999 136 int rtc_isenabled(void)
<> 149:156823d33999 137 {
<> 149:156823d33999 138 #if RTC_LSI
<> 149:156823d33999 139 return rtc_inited;
<> 149:156823d33999 140 #else
<> 149:156823d33999 141 if ((RTC->ISR & RTC_ISR_INITS) == RTC_ISR_INITS) {
<> 149:156823d33999 142 return 1;
<> 149:156823d33999 143 } else {
<> 149:156823d33999 144 return 0;
<> 149:156823d33999 145 }
<> 149:156823d33999 146 #endif
<> 149:156823d33999 147 }
<> 149:156823d33999 148
<> 149:156823d33999 149 /*
<> 149:156823d33999 150 RTC Registers
<> 149:156823d33999 151 RTC_WeekDay 1=monday, 2=tuesday, ..., 7=sunday
<> 149:156823d33999 152 RTC_Month 1=january, 2=february, ..., 12=december
<> 149:156823d33999 153 RTC_Date day of the month 1-31
<> 149:156823d33999 154 RTC_Year year 0-99
<> 149:156823d33999 155 struct tm
<> 149:156823d33999 156 tm_sec seconds after the minute 0-61
<> 149:156823d33999 157 tm_min minutes after the hour 0-59
<> 149:156823d33999 158 tm_hour hours since midnight 0-23
<> 149:156823d33999 159 tm_mday day of the month 1-31
<> 149:156823d33999 160 tm_mon months since January 0-11
<> 149:156823d33999 161 tm_year years since 1900
<> 149:156823d33999 162 tm_wday days since Sunday 0-6
<> 149:156823d33999 163 tm_yday days since January 1 0-365
<> 149:156823d33999 164 tm_isdst Daylight Saving Time flag
<> 149:156823d33999 165 */
<> 149:156823d33999 166 time_t rtc_read(void)
<> 149:156823d33999 167 {
<> 149:156823d33999 168 RTC_DateTypeDef dateStruct;
<> 149:156823d33999 169 RTC_TimeTypeDef timeStruct;
<> 149:156823d33999 170 struct tm timeinfo;
<> 149:156823d33999 171
<> 149:156823d33999 172 RtcHandle.Instance = RTC;
<> 149:156823d33999 173
<> 149:156823d33999 174 // Read actual date and time
<> 149:156823d33999 175 // Warning: the time must be read first!
<> 149:156823d33999 176 HAL_RTC_GetTime(&RtcHandle, &timeStruct, FORMAT_BIN);
<> 149:156823d33999 177 HAL_RTC_GetDate(&RtcHandle, &dateStruct, FORMAT_BIN);
<> 149:156823d33999 178
<> 149:156823d33999 179 // Setup a tm structure based on the RTC
<> 149:156823d33999 180 timeinfo.tm_wday = dateStruct.WeekDay;
<> 149:156823d33999 181 timeinfo.tm_mon = dateStruct.Month - 1;
<> 149:156823d33999 182 timeinfo.tm_mday = dateStruct.Date;
<> 149:156823d33999 183 timeinfo.tm_year = dateStruct.Year + 68;
<> 149:156823d33999 184 timeinfo.tm_hour = timeStruct.Hours;
<> 149:156823d33999 185 timeinfo.tm_min = timeStruct.Minutes;
<> 149:156823d33999 186 timeinfo.tm_sec = timeStruct.Seconds;
<> 149:156823d33999 187 timeinfo.tm_isdst = -1;
<> 149:156823d33999 188
<> 149:156823d33999 189 // Convert to timestamp
<> 149:156823d33999 190 time_t t = mktime(&timeinfo);
<> 149:156823d33999 191
<> 149:156823d33999 192 return t;
<> 149:156823d33999 193 }
<> 149:156823d33999 194
<> 149:156823d33999 195 void rtc_write(time_t t)
<> 149:156823d33999 196 {
<> 149:156823d33999 197 RTC_DateTypeDef dateStruct;
<> 149:156823d33999 198 RTC_TimeTypeDef timeStruct;
<> 149:156823d33999 199
<> 149:156823d33999 200 RtcHandle.Instance = RTC;
<> 149:156823d33999 201
<> 149:156823d33999 202 // Convert the time into a tm
<> 149:156823d33999 203 struct tm *timeinfo = localtime(&t);
<> 149:156823d33999 204
<> 149:156823d33999 205 // Fill RTC structures
<> 149:156823d33999 206 dateStruct.WeekDay = timeinfo->tm_wday;
<> 149:156823d33999 207 dateStruct.Month = timeinfo->tm_mon + 1;
<> 149:156823d33999 208 dateStruct.Date = timeinfo->tm_mday;
<> 149:156823d33999 209 dateStruct.Year = timeinfo->tm_year - 68;
<> 149:156823d33999 210 timeStruct.Hours = timeinfo->tm_hour;
<> 149:156823d33999 211 timeStruct.Minutes = timeinfo->tm_min;
<> 149:156823d33999 212 timeStruct.Seconds = timeinfo->tm_sec;
<> 149:156823d33999 213 timeStruct.TimeFormat = RTC_HOURFORMAT_24;
<> 149:156823d33999 214 timeStruct.DayLightSaving = RTC_DAYLIGHTSAVING_NONE;
<> 149:156823d33999 215 timeStruct.StoreOperation = RTC_STOREOPERATION_RESET;
<> 149:156823d33999 216
<> 149:156823d33999 217 // Change the RTC current date/time
<> 149:156823d33999 218 HAL_RTC_SetDate(&RtcHandle, &dateStruct, FORMAT_BIN);
<> 149:156823d33999 219 HAL_RTC_SetTime(&RtcHandle, &timeStruct, FORMAT_BIN);
<> 149:156823d33999 220 }
<> 149:156823d33999 221
<> 149:156823d33999 222 #endif