tool/mbed/mbed-sdk/libraries/mbed/targets/hal/TARGET_STM/TARGET_STM32F1/rtc_api.c

   1 /* mbed Microcontroller Library
   2  *******************************************************************************
   3  * Copyright (c) 2014, STMicroelectronics
   4  * All rights reserved.
   5  *
   6  * Redistribution and use in source and binary forms, with or without
   7  * modification, are permitted provided that the following conditions are met:
   8  *
   9  * 1. Redistributions of source code must retain the above copyright notice,
  10  *    this list of conditions and the following disclaimer.
  11  * 2. Redistributions in binary form must reproduce the above copyright notice,
  12  *    this list of conditions and the following disclaimer in the documentation
  13  *    and/or other materials provided with the distribution.
  14  * 3. Neither the name of STMicroelectronics nor the names of its contributors
  15  *    may be used to endorse or promote products derived from this software
  16  *    without specific prior written permission.
  17  *
  18  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
  19  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  20  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
  21  * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
  22  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  23  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
  24  * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
  25  * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
  26  * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  27  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  28  *******************************************************************************
  29  */
  30 #include "rtc_api.h"
  31
  32 #if DEVICE_RTC
  33
  34 #include "mbed_error.h"
  35
  36 static int rtc_inited = 0;
  37
  38 static RTC_HandleTypeDef RtcHandle;
  39
  40 void rtc_init(void)
  41 {
  42     RCC_OscInitTypeDef RCC_OscInitStruct;
  43
  44     if (rtc_inited) return;
  45     rtc_inited = 1;
  46
  47     RtcHandle.Instance = RTC;
  48
  49     // Enable Power clock
  50     __HAL_RCC_PWR_CLK_ENABLE();
  51
  52     // Enable access to Backup domain
  53     HAL_PWR_EnableBkUpAccess();
  54
  55     // Reset Backup domain
  56     __HAL_RCC_BACKUPRESET_FORCE();
  57     __HAL_RCC_BACKUPRESET_RELEASE();
  58
  59     // Enable LSE Oscillator
  60     RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_LSE;
  61     RCC_OscInitStruct.PLL.PLLState   = RCC_PLL_NONE; // Mandatory, otherwise the PLL is reconfigured!
  62     RCC_OscInitStruct.LSEState       = RCC_LSE_ON; // External 32.768 kHz clock on OSC_IN/OSC_OUT
  63     if (HAL_RCC_OscConfig(&RCC_OscInitStruct) == HAL_OK) {
  64         // Connect LSE to RTC
  65         __HAL_RCC_RTC_CONFIG(RCC_RTCCLKSOURCE_LSE);
  66     } else {
  67         // Enable LSI clock
  68         RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_LSI | RCC_OSCILLATORTYPE_LSE;
  69         RCC_OscInitStruct.PLL.PLLState   = RCC_PLL_NONE; // Mandatory, otherwise the PLL is reconfigured!
  70         RCC_OscInitStruct.LSEState       = RCC_LSE_OFF;
  71         RCC_OscInitStruct.LSIState       = RCC_LSI_ON;
  72         if (HAL_RCC_OscConfig(&RCC_OscInitStruct) != HAL_OK) {
  73             error("RTC error: LSI clock initialization failed.");
  74         }
  75         // Connect LSI to RTC
  76         __HAL_RCC_RTC_CONFIG(RCC_RTCCLKSOURCE_LSI);
  77     }
  78
  79     // Enable RTC
  80     __HAL_RCC_RTC_ENABLE();
  81
  82     RtcHandle.Init.AsynchPrediv = RTC_AUTO_1_SECOND;
  83
  84     if (HAL_RTC_Init(&RtcHandle) != HAL_OK) {
  85         error("RTC error: RTC initialization failed.");
  86     }
  87 }
  88
  89 void rtc_free(void)
  90 {
  91     // Enable Power clock
  92     __PWR_CLK_ENABLE();
  93
  94     // Enable access to Backup domain
  95     HAL_PWR_EnableBkUpAccess();
  96
  97     // Reset Backup domain
  98     __HAL_RCC_BACKUPRESET_FORCE();
  99     __HAL_RCC_BACKUPRESET_RELEASE();
 100
 101     // Disable access to Backup domain
 102     HAL_PWR_DisableBkUpAccess();
 103
 104     // Disable LSI and LSE clocks
 105     RCC_OscInitTypeDef RCC_OscInitStruct;
 106     RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_LSI | RCC_OSCILLATORTYPE_LSE;
 107     RCC_OscInitStruct.PLL.PLLState   = RCC_PLL_NONE;
 108     RCC_OscInitStruct.LSIState       = RCC_LSI_OFF;
 109     RCC_OscInitStruct.LSEState       = RCC_LSE_OFF;
 110     HAL_RCC_OscConfig(&RCC_OscInitStruct);
 111
 112     rtc_inited = 0;
 113 }
 114
 115 int rtc_isenabled(void)
 116 {
 117     return rtc_inited;
 118 }
 119
 120 /*
 121  RTC Registers
 122    RTC_WeekDay 1=monday, 2=tuesday, ..., 7=sunday
 123    RTC_Month   1=january, 2=february, ..., 12=december
 124    RTC_Date    day of the month 1-31
 125    RTC_Year    year 0-99
 126  struct tm
 127    tm_sec      seconds after the minute 0-61
 128    tm_min      minutes after the hour 0-59
 129    tm_hour     hours since midnight 0-23
 130    tm_mday     day of the month 1-31
 131    tm_mon      months since January 0-11
 132    tm_year     years since 1900
 133    tm_wday     days since Sunday 0-6
 134    tm_yday     days since January 1 0-365
 135    tm_isdst    Daylight Saving Time flag
 136 */
 137 time_t rtc_read(void)
 138 {
 139     RTC_DateTypeDef dateStruct;
 140     RTC_TimeTypeDef timeStruct;
 141     struct tm timeinfo;
 142
 143     RtcHandle.Instance = RTC;
 144
 145     // Read actual date and time
 146     // Warning: the time must be read first!
 147     HAL_RTC_GetTime(&RtcHandle, &timeStruct, FORMAT_BIN);
 148     HAL_RTC_GetDate(&RtcHandle, &dateStruct, FORMAT_BIN);
 149
 150     // Setup a tm structure based on the RTC
 151     timeinfo.tm_wday = dateStruct.WeekDay;
 152     timeinfo.tm_mon  = dateStruct.Month - 1;
 153     timeinfo.tm_mday = dateStruct.Date;
 154     timeinfo.tm_year = dateStruct.Year + 100;
 155     timeinfo.tm_hour = timeStruct.Hours;
 156     timeinfo.tm_min  = timeStruct.Minutes;
 157     timeinfo.tm_sec  = timeStruct.Seconds;
 158
 159     // Convert to timestamp
 160     time_t t = mktime(&timeinfo);
 161
 162     return t;
 163 }
 164
 165 void rtc_write(time_t t)
 166 {
 167     RTC_DateTypeDef dateStruct;
 168     RTC_TimeTypeDef timeStruct;
 169
 170     RtcHandle.Instance = RTC;
 171
 172     // Convert the time into a tm
 173     struct tm *timeinfo = localtime(&t);
 174
 175     // Fill RTC structures
 176     dateStruct.WeekDay        = timeinfo->tm_wday;
 177     dateStruct.Month          = timeinfo->tm_mon + 1;
 178     dateStruct.Date           = timeinfo->tm_mday;
 179     dateStruct.Year           = timeinfo->tm_year - 100;
 180     timeStruct.Hours          = timeinfo->tm_hour;
 181     timeStruct.Minutes        = timeinfo->tm_min;
 182     timeStruct.Seconds        = timeinfo->tm_sec;
 183
 184     // Change the RTC current date/time
 185     HAL_RTC_SetDate(&RtcHandle, &dateStruct, FORMAT_BIN);
 186     HAL_RTC_SetTime(&RtcHandle, &timeStruct, FORMAT_BIN);
 187 }
 188
 189 #endif