erkin yucel / mbed-os

mbed os with nrf51 internal bandgap enabled to read battery level

Dependents:   BLE_file_test BLE_Blink ExternalEncoder

targets/TARGET_STM/TARGET_STM32F2/rtc_api.c@0:f269e3021894, 2016-10-23 (annotated)

Committer:
elessair
Date:
Sun Oct 23 15:10:02 2016 +0000
Revision:
0:f269e3021894
Initial commit

Who changed what in which revision?

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elessair 0:f269e3021894 1 /* mbed Microcontroller Library
elessair 0:f269e3021894 2 *******************************************************************************
elessair 0:f269e3021894 3 * Copyright (c) 2016, STMicroelectronics
elessair 0:f269e3021894 4 * All rights reserved.
elessair 0:f269e3021894 5 *
elessair 0:f269e3021894 6 * Redistribution and use in source and binary forms, with or without
elessair 0:f269e3021894 7 * modification, are permitted provided that the following conditions are met:
elessair 0:f269e3021894 8 *
elessair 0:f269e3021894 9 * 1. Redistributions of source code must retain the above copyright notice,
elessair 0:f269e3021894 10 * this list of conditions and the following disclaimer.
elessair 0:f269e3021894 11 * 2. Redistributions in binary form must reproduce the above copyright notice,
elessair 0:f269e3021894 12 * this list of conditions and the following disclaimer in the documentation
elessair 0:f269e3021894 13 * and/or other materials provided with the distribution.
elessair 0:f269e3021894 14 * 3. Neither the name of STMicroelectronics nor the names of its contributors
elessair 0:f269e3021894 15 * may be used to endorse or promote products derived from this software
elessair 0:f269e3021894 16 * without specific prior written permission.
elessair 0:f269e3021894 17 *
elessair 0:f269e3021894 18 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
elessair 0:f269e3021894 19 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
elessair 0:f269e3021894 20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
elessair 0:f269e3021894 21 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
elessair 0:f269e3021894 22 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
elessair 0:f269e3021894 23 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
elessair 0:f269e3021894 24 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
elessair 0:f269e3021894 25 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
elessair 0:f269e3021894 26 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
elessair 0:f269e3021894 27 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
elessair 0:f269e3021894 28 *******************************************************************************
elessair 0:f269e3021894 29 */
elessair 0:f269e3021894 30 #include "rtc_api.h"
elessair 0:f269e3021894 31
elessair 0:f269e3021894 32 #if DEVICE_RTC
elessair 0:f269e3021894 33
elessair 0:f269e3021894 34 #include "mbed_error.h"
elessair 0:f269e3021894 35
elessair 0:f269e3021894 36 #if RTC_LSI
elessair 0:f269e3021894 37 static int rtc_inited = 0;
elessair 0:f269e3021894 38 #endif
elessair 0:f269e3021894 39
elessair 0:f269e3021894 40 static RTC_HandleTypeDef RtcHandle;
elessair 0:f269e3021894 41
elessair 0:f269e3021894 42 void rtc_init(void)
elessair 0:f269e3021894 43 {
elessair 0:f269e3021894 44 RCC_OscInitTypeDef RCC_OscInitStruct;
elessair 0:f269e3021894 45 uint32_t rtc_freq = 0;
elessair 0:f269e3021894 46
elessair 0:f269e3021894 47 #if RTC_LSI
elessair 0:f269e3021894 48 rtc_inited = 1;
elessair 0:f269e3021894 49 #endif
elessair 0:f269e3021894 50
elessair 0:f269e3021894 51 RtcHandle.Instance = RTC;
elessair 0:f269e3021894 52
elessair 0:f269e3021894 53 #if !RTC_LSI
elessair 0:f269e3021894 54 // Enable LSE Oscillator
elessair 0:f269e3021894 55 RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_LSE;
elessair 0:f269e3021894 56 RCC_OscInitStruct.PLL.PLLState = RCC_PLL_NONE; /* Mandatory, otherwise the PLL is reconfigured! */
elessair 0:f269e3021894 57 RCC_OscInitStruct.LSEState = RCC_LSE_ON; /* External 32.768 kHz clock on OSC_IN/OSC_OUT */
elessair 0:f269e3021894 58 if (HAL_RCC_OscConfig(&RCC_OscInitStruct) == HAL_OK) {
elessair 0:f269e3021894 59 // Connect LSE to RTC
elessair 0:f269e3021894 60 __HAL_RCC_RTC_CLKPRESCALER(RCC_RTCCLKSOURCE_LSE);
elessair 0:f269e3021894 61 __HAL_RCC_RTC_CONFIG(RCC_RTCCLKSOURCE_LSE);
elessair 0:f269e3021894 62 rtc_freq = LSE_VALUE;
elessair 0:f269e3021894 63 } else {
elessair 0:f269e3021894 64 error("RTC error: LSE clock initialization failed.");
elessair 0:f269e3021894 65 }
elessair 0:f269e3021894 66 #else
elessair 0:f269e3021894 67 // Enable Power clock
elessair 0:f269e3021894 68 __PWR_CLK_ENABLE();
elessair 0:f269e3021894 69
elessair 0:f269e3021894 70 // Enable access to Backup domain
elessair 0:f269e3021894 71 HAL_PWR_EnableBkUpAccess();
elessair 0:f269e3021894 72
elessair 0:f269e3021894 73 // Reset Backup domain
elessair 0:f269e3021894 74 __HAL_RCC_BACKUPRESET_FORCE();
elessair 0:f269e3021894 75 __HAL_RCC_BACKUPRESET_RELEASE();
elessair 0:f269e3021894 76
elessair 0:f269e3021894 77 // Enable LSI clock
elessair 0:f269e3021894 78 RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_LSI | RCC_OSCILLATORTYPE_LSE;
elessair 0:f269e3021894 79 RCC_OscInitStruct.PLL.PLLState = RCC_PLL_NONE; // Mandatory, otherwise the PLL is reconfigured!
elessair 0:f269e3021894 80 RCC_OscInitStruct.LSEState = RCC_LSE_OFF;
elessair 0:f269e3021894 81 RCC_OscInitStruct.LSIState = RCC_LSI_ON;
elessair 0:f269e3021894 82 if (HAL_RCC_OscConfig(&RCC_OscInitStruct) != HAL_OK) {
elessair 0:f269e3021894 83 error("RTC error: LSI clock initialization failed.");
elessair 0:f269e3021894 84 }
elessair 0:f269e3021894 85 // Connect LSI to RTC
elessair 0:f269e3021894 86 __HAL_RCC_RTC_CLKPRESCALER(RCC_RTCCLKSOURCE_LSI);
elessair 0:f269e3021894 87 __HAL_RCC_RTC_CONFIG(RCC_RTCCLKSOURCE_LSI);
elessair 0:f269e3021894 88 // [TODO] This value is LSI typical value. To be measured precisely using a timer input capture
elessair 0:f269e3021894 89 rtc_freq = LSI_VALUE;
elessair 0:f269e3021894 90 #endif
elessair 0:f269e3021894 91
elessair 0:f269e3021894 92 // Enable RTC
elessair 0:f269e3021894 93 __HAL_RCC_RTC_ENABLE();
elessair 0:f269e3021894 94
elessair 0:f269e3021894 95 RtcHandle.Init.HourFormat = RTC_HOURFORMAT_24;
elessair 0:f269e3021894 96 RtcHandle.Init.AsynchPrediv = 127;
elessair 0:f269e3021894 97 RtcHandle.Init.SynchPrediv = (rtc_freq / 128) - 1;
elessair 0:f269e3021894 98 RtcHandle.Init.OutPut = RTC_OUTPUT_DISABLE;
elessair 0:f269e3021894 99 RtcHandle.Init.OutPutPolarity = RTC_OUTPUT_POLARITY_HIGH;
elessair 0:f269e3021894 100 RtcHandle.Init.OutPutType = RTC_OUTPUT_TYPE_OPENDRAIN;
elessair 0:f269e3021894 101
elessair 0:f269e3021894 102 if (HAL_RTC_Init(&RtcHandle) != HAL_OK) {
elessair 0:f269e3021894 103 error("RTC error: RTC initialization failed.");
elessair 0:f269e3021894 104 }
elessair 0:f269e3021894 105 }
elessair 0:f269e3021894 106
elessair 0:f269e3021894 107 void rtc_free(void)
elessair 0:f269e3021894 108 {
elessair 0:f269e3021894 109 #if RTC_LSI
elessair 0:f269e3021894 110 // Enable Power clock
elessair 0:f269e3021894 111 __PWR_CLK_ENABLE();
elessair 0:f269e3021894 112
elessair 0:f269e3021894 113 // Enable access to Backup domain
elessair 0:f269e3021894 114 HAL_PWR_EnableBkUpAccess();
elessair 0:f269e3021894 115
elessair 0:f269e3021894 116 // Reset Backup domain
elessair 0:f269e3021894 117 __HAL_RCC_BACKUPRESET_FORCE();
elessair 0:f269e3021894 118 __HAL_RCC_BACKUPRESET_RELEASE();
elessair 0:f269e3021894 119
elessair 0:f269e3021894 120 // Disable access to Backup domain
elessair 0:f269e3021894 121 HAL_PWR_DisableBkUpAccess();
elessair 0:f269e3021894 122 #endif
elessair 0:f269e3021894 123
elessair 0:f269e3021894 124 // Disable LSI and LSE clocks
elessair 0:f269e3021894 125 RCC_OscInitTypeDef RCC_OscInitStruct;
elessair 0:f269e3021894 126 RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_LSI | RCC_OSCILLATORTYPE_LSE;
elessair 0:f269e3021894 127 RCC_OscInitStruct.PLL.PLLState = RCC_PLL_NONE;
elessair 0:f269e3021894 128 RCC_OscInitStruct.LSIState = RCC_LSI_OFF;
elessair 0:f269e3021894 129 RCC_OscInitStruct.LSEState = RCC_LSE_OFF;
elessair 0:f269e3021894 130 HAL_RCC_OscConfig(&RCC_OscInitStruct);
elessair 0:f269e3021894 131 #if RTC_LSI
elessair 0:f269e3021894 132 rtc_inited = 0;
elessair 0:f269e3021894 133 #endif
elessair 0:f269e3021894 134 }
elessair 0:f269e3021894 135
elessair 0:f269e3021894 136 int rtc_isenabled(void)
elessair 0:f269e3021894 137 {
elessair 0:f269e3021894 138 #if RTC_LSI
elessair 0:f269e3021894 139 return rtc_inited;
elessair 0:f269e3021894 140 #else
elessair 0:f269e3021894 141 if ((RTC->ISR & RTC_ISR_INITS) == RTC_ISR_INITS) {
elessair 0:f269e3021894 142 return 1;
elessair 0:f269e3021894 143 } else {
elessair 0:f269e3021894 144 return 0;
elessair 0:f269e3021894 145 }
elessair 0:f269e3021894 146 #endif
elessair 0:f269e3021894 147 }
elessair 0:f269e3021894 148
elessair 0:f269e3021894 149 /*
elessair 0:f269e3021894 150 RTC Registers
elessair 0:f269e3021894 151 RTC_WeekDay 1=monday, 2=tuesday, ..., 7=sunday
elessair 0:f269e3021894 152 RTC_Month 1=january, 2=february, ..., 12=december
elessair 0:f269e3021894 153 RTC_Date day of the month 1-31
elessair 0:f269e3021894 154 RTC_Year year 0-99
elessair 0:f269e3021894 155 struct tm
elessair 0:f269e3021894 156 tm_sec seconds after the minute 0-61
elessair 0:f269e3021894 157 tm_min minutes after the hour 0-59
elessair 0:f269e3021894 158 tm_hour hours since midnight 0-23
elessair 0:f269e3021894 159 tm_mday day of the month 1-31
elessair 0:f269e3021894 160 tm_mon months since January 0-11
elessair 0:f269e3021894 161 tm_year years since 1900
elessair 0:f269e3021894 162 tm_wday days since Sunday 0-6
elessair 0:f269e3021894 163 tm_yday days since January 1 0-365
elessair 0:f269e3021894 164 tm_isdst Daylight Saving Time flag
elessair 0:f269e3021894 165 */
elessair 0:f269e3021894 166 time_t rtc_read(void)
elessair 0:f269e3021894 167 {
elessair 0:f269e3021894 168 RTC_DateTypeDef dateStruct;
elessair 0:f269e3021894 169 RTC_TimeTypeDef timeStruct;
elessair 0:f269e3021894 170 struct tm timeinfo;
elessair 0:f269e3021894 171
elessair 0:f269e3021894 172 RtcHandle.Instance = RTC;
elessair 0:f269e3021894 173
elessair 0:f269e3021894 174 // Read actual date and time
elessair 0:f269e3021894 175 // Warning: the time must be read first!
elessair 0:f269e3021894 176 HAL_RTC_GetTime(&RtcHandle, &timeStruct, FORMAT_BIN);
elessair 0:f269e3021894 177 HAL_RTC_GetDate(&RtcHandle, &dateStruct, FORMAT_BIN);
elessair 0:f269e3021894 178
elessair 0:f269e3021894 179 // Setup a tm structure based on the RTC
elessair 0:f269e3021894 180 timeinfo.tm_wday = dateStruct.WeekDay;
elessair 0:f269e3021894 181 timeinfo.tm_mon = dateStruct.Month - 1;
elessair 0:f269e3021894 182 timeinfo.tm_mday = dateStruct.Date;
elessair 0:f269e3021894 183 timeinfo.tm_year = dateStruct.Year + 68;
elessair 0:f269e3021894 184 timeinfo.tm_hour = timeStruct.Hours;
elessair 0:f269e3021894 185 timeinfo.tm_min = timeStruct.Minutes;
elessair 0:f269e3021894 186 timeinfo.tm_sec = timeStruct.Seconds;
elessair 0:f269e3021894 187 timeinfo.tm_isdst = -1;
elessair 0:f269e3021894 188
elessair 0:f269e3021894 189 // Convert to timestamp
elessair 0:f269e3021894 190 time_t t = mktime(&timeinfo);
elessair 0:f269e3021894 191
elessair 0:f269e3021894 192 return t;
elessair 0:f269e3021894 193 }
elessair 0:f269e3021894 194
elessair 0:f269e3021894 195 void rtc_write(time_t t)
elessair 0:f269e3021894 196 {
elessair 0:f269e3021894 197 RTC_DateTypeDef dateStruct;
elessair 0:f269e3021894 198 RTC_TimeTypeDef timeStruct;
elessair 0:f269e3021894 199
elessair 0:f269e3021894 200 RtcHandle.Instance = RTC;
elessair 0:f269e3021894 201
elessair 0:f269e3021894 202 // Convert the time into a tm
elessair 0:f269e3021894 203 struct tm *timeinfo = localtime(&t);
elessair 0:f269e3021894 204
elessair 0:f269e3021894 205 // Fill RTC structures
elessair 0:f269e3021894 206 dateStruct.WeekDay = timeinfo->tm_wday;
elessair 0:f269e3021894 207 dateStruct.Month = timeinfo->tm_mon + 1;
elessair 0:f269e3021894 208 dateStruct.Date = timeinfo->tm_mday;
elessair 0:f269e3021894 209 dateStruct.Year = timeinfo->tm_year - 68;
elessair 0:f269e3021894 210 timeStruct.Hours = timeinfo->tm_hour;
elessair 0:f269e3021894 211 timeStruct.Minutes = timeinfo->tm_min;
elessair 0:f269e3021894 212 timeStruct.Seconds = timeinfo->tm_sec;
elessair 0:f269e3021894 213 timeStruct.TimeFormat = RTC_HOURFORMAT_24;
elessair 0:f269e3021894 214 timeStruct.DayLightSaving = RTC_DAYLIGHTSAVING_NONE;
elessair 0:f269e3021894 215 timeStruct.StoreOperation = RTC_STOREOPERATION_RESET;
elessair 0:f269e3021894 216
elessair 0:f269e3021894 217 // Change the RTC current date/time
elessair 0:f269e3021894 218 HAL_RTC_SetDate(&RtcHandle, &dateStruct, FORMAT_BIN);
elessair 0:f269e3021894 219 HAL_RTC_SetTime(&RtcHandle, &timeStruct, FORMAT_BIN);
elessair 0:f269e3021894 220 }
elessair 0:f269e3021894 221
elessair 0:f269e3021894 222 #endif