Abdessamad El Abbassi / mbed-src-temp

mbed library sources

Fork of mbed-src by mbed official

targets/hal/TARGET_STM/TARGET_DISCO_F051R8/rtc_api.c@130:1dec54e4aec3, 2014-03-21 (annotated)

Committer:
mbed_official
Date:
Fri Mar 21 11:45:09 2014 +0000
Revision:
130:1dec54e4aec3
Synchronized with git revision e5c9ff6781a4e277a5a454e5a0b037f76e31739d



Full URL: https://github.com/mbedmicro/mbed/commit/e5c9ff6781a4e277a5a454e5a0b037f76e31739d/



STM32F0-Discovery (STM32F051R8) initial port

Who changed what in which revision?

UserRevisionLine numberNew contents of line
mbed_official 130:1dec54e4aec3 1 /* mbed Microcontroller Library
mbed_official 130:1dec54e4aec3 2 *******************************************************************************
mbed_official 130:1dec54e4aec3 3 * Copyright (c) 2014, STMicroelectronics
mbed_official 130:1dec54e4aec3 4 * All rights reserved.
mbed_official 130:1dec54e4aec3 5 *
mbed_official 130:1dec54e4aec3 6 * Redistribution and use in source and binary forms, with or without
mbed_official 130:1dec54e4aec3 7 * modification, are permitted provided that the following conditions are met:
mbed_official 130:1dec54e4aec3 8 *
mbed_official 130:1dec54e4aec3 9 * 1. Redistributions of source code must retain the above copyright notice,
mbed_official 130:1dec54e4aec3 10 * this list of conditions and the following disclaimer.
mbed_official 130:1dec54e4aec3 11 * 2. Redistributions in binary form must reproduce the above copyright notice,
mbed_official 130:1dec54e4aec3 12 * this list of conditions and the following disclaimer in the documentation
mbed_official 130:1dec54e4aec3 13 * and/or other materials provided with the distribution.
mbed_official 130:1dec54e4aec3 14 * 3. Neither the name of STMicroelectronics nor the names of its contributors
mbed_official 130:1dec54e4aec3 15 * may be used to endorse or promote products derived from this software
mbed_official 130:1dec54e4aec3 16 * without specific prior written permission.
mbed_official 130:1dec54e4aec3 17 *
mbed_official 130:1dec54e4aec3 18 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
mbed_official 130:1dec54e4aec3 19 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
mbed_official 130:1dec54e4aec3 20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
mbed_official 130:1dec54e4aec3 21 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
mbed_official 130:1dec54e4aec3 22 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
mbed_official 130:1dec54e4aec3 23 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
mbed_official 130:1dec54e4aec3 24 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
mbed_official 130:1dec54e4aec3 25 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
mbed_official 130:1dec54e4aec3 26 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
mbed_official 130:1dec54e4aec3 27 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
mbed_official 130:1dec54e4aec3 28 *******************************************************************************
mbed_official 130:1dec54e4aec3 29 */
mbed_official 130:1dec54e4aec3 30 #include "rtc_api.h"
mbed_official 130:1dec54e4aec3 31
mbed_official 130:1dec54e4aec3 32 static int rtc_inited = 0;
mbed_official 130:1dec54e4aec3 33
mbed_official 130:1dec54e4aec3 34 void rtc_init(void) {
mbed_official 130:1dec54e4aec3 35 RCC_APB1PeriphClockCmd(RCC_APB1Periph_PWR, ENABLE); // Enable PWR clock
mbed_official 130:1dec54e4aec3 36
mbed_official 130:1dec54e4aec3 37 PWR_BackupAccessCmd(ENABLE); // Enable access to RTC
mbed_official 130:1dec54e4aec3 38
mbed_official 130:1dec54e4aec3 39 // Note: the LSI is used as RTC source clock
mbed_official 130:1dec54e4aec3 40 // The RTC Clock may vary due to LSI frequency dispersion.
mbed_official 130:1dec54e4aec3 41
mbed_official 130:1dec54e4aec3 42 RCC_LSICmd(ENABLE); // Enable LSI
mbed_official 130:1dec54e4aec3 43
mbed_official 130:1dec54e4aec3 44 while (RCC_GetFlagStatus(RCC_FLAG_LSIRDY) == RESET) {} // Wait until ready
mbed_official 130:1dec54e4aec3 45
mbed_official 130:1dec54e4aec3 46 RCC_RTCCLKConfig(RCC_RTCCLKSource_LSI); // Select LSI as RTC Clock Source
mbed_official 130:1dec54e4aec3 47
mbed_official 130:1dec54e4aec3 48 RCC_RTCCLKCmd(ENABLE); // Enable RTC Clock
mbed_official 130:1dec54e4aec3 49
mbed_official 130:1dec54e4aec3 50 RTC_WaitForSynchro(); // Wait for RTC registers synchronization
mbed_official 130:1dec54e4aec3 51
mbed_official 130:1dec54e4aec3 52 uint32_t lsi_freq = 40000; // *** TODO** To be measured precisely using a timer input capture
mbed_official 130:1dec54e4aec3 53
mbed_official 130:1dec54e4aec3 54 RTC_InitTypeDef RTC_InitStructure;
mbed_official 130:1dec54e4aec3 55 RTC_InitStructure.RTC_AsynchPrediv = 127;
mbed_official 130:1dec54e4aec3 56 RTC_InitStructure.RTC_SynchPrediv = (lsi_freq / 128) - 1;
mbed_official 130:1dec54e4aec3 57 RTC_InitStructure.RTC_HourFormat = RTC_HourFormat_24;
mbed_official 130:1dec54e4aec3 58 RTC_Init(&RTC_InitStructure);
mbed_official 130:1dec54e4aec3 59
mbed_official 130:1dec54e4aec3 60 PWR_BackupAccessCmd(DISABLE); // Disable access to RTC
mbed_official 130:1dec54e4aec3 61
mbed_official 130:1dec54e4aec3 62 rtc_inited = 1;
mbed_official 130:1dec54e4aec3 63 }
mbed_official 130:1dec54e4aec3 64
mbed_official 130:1dec54e4aec3 65 void rtc_free(void) {
mbed_official 130:1dec54e4aec3 66 RCC_DeInit(); // Resets the RCC clock configuration to the default reset state
mbed_official 130:1dec54e4aec3 67 rtc_inited = 0;
mbed_official 130:1dec54e4aec3 68 }
mbed_official 130:1dec54e4aec3 69
mbed_official 130:1dec54e4aec3 70 int rtc_isenabled(void) {
mbed_official 130:1dec54e4aec3 71 return rtc_inited;
mbed_official 130:1dec54e4aec3 72 }
mbed_official 130:1dec54e4aec3 73
mbed_official 130:1dec54e4aec3 74 /*
mbed_official 130:1dec54e4aec3 75 RTC Registers
mbed_official 130:1dec54e4aec3 76 RTC_WeekDay 1=monday, 2=tuesday, ..., 7=sunday
mbed_official 130:1dec54e4aec3 77 RTC_Month 1=january, 2=february, ..., 12=december
mbed_official 130:1dec54e4aec3 78 RTC_Date day of the month 1-31
mbed_official 130:1dec54e4aec3 79 RTC_Year year 0-99
mbed_official 130:1dec54e4aec3 80 struct tm
mbed_official 130:1dec54e4aec3 81 tm_sec seconds after the minute 0-61
mbed_official 130:1dec54e4aec3 82 tm_min minutes after the hour 0-59
mbed_official 130:1dec54e4aec3 83 tm_hour hours since midnight 0-23
mbed_official 130:1dec54e4aec3 84 tm_mday day of the month 1-31
mbed_official 130:1dec54e4aec3 85 tm_mon months since January 0-11
mbed_official 130:1dec54e4aec3 86 tm_year years since 1900
mbed_official 130:1dec54e4aec3 87 tm_wday days since Sunday 0-6
mbed_official 130:1dec54e4aec3 88 tm_yday days since January 1 0-365
mbed_official 130:1dec54e4aec3 89 tm_isdst Daylight Saving Time flag
mbed_official 130:1dec54e4aec3 90 */
mbed_official 130:1dec54e4aec3 91 time_t rtc_read(void) {
mbed_official 130:1dec54e4aec3 92 RTC_DateTypeDef dateStruct;
mbed_official 130:1dec54e4aec3 93 RTC_TimeTypeDef timeStruct;
mbed_official 130:1dec54e4aec3 94 struct tm timeinfo;
mbed_official 130:1dec54e4aec3 95
mbed_official 130:1dec54e4aec3 96 // Read actual date and time
mbed_official 130:1dec54e4aec3 97 RTC_GetTime(RTC_Format_BIN, &timeStruct);
mbed_official 130:1dec54e4aec3 98 RTC_GetDate(RTC_Format_BIN, &dateStruct);
mbed_official 130:1dec54e4aec3 99
mbed_official 130:1dec54e4aec3 100 // Setup a tm structure based on the RTC
mbed_official 130:1dec54e4aec3 101 timeinfo.tm_wday = dateStruct.RTC_WeekDay;
mbed_official 130:1dec54e4aec3 102 timeinfo.tm_mon = dateStruct.RTC_Month - 1;
mbed_official 130:1dec54e4aec3 103 timeinfo.tm_mday = dateStruct.RTC_Date;
mbed_official 130:1dec54e4aec3 104 timeinfo.tm_year = dateStruct.RTC_Year + 100;
mbed_official 130:1dec54e4aec3 105 timeinfo.tm_hour = timeStruct.RTC_Hours;
mbed_official 130:1dec54e4aec3 106 timeinfo.tm_min = timeStruct.RTC_Minutes;
mbed_official 130:1dec54e4aec3 107 timeinfo.tm_sec = timeStruct.RTC_Seconds;
mbed_official 130:1dec54e4aec3 108
mbed_official 130:1dec54e4aec3 109 // Convert to timestamp
mbed_official 130:1dec54e4aec3 110 time_t t = mktime(&timeinfo);
mbed_official 130:1dec54e4aec3 111
mbed_official 130:1dec54e4aec3 112 return t;
mbed_official 130:1dec54e4aec3 113 }
mbed_official 130:1dec54e4aec3 114
mbed_official 130:1dec54e4aec3 115 void rtc_write(time_t t) {
mbed_official 130:1dec54e4aec3 116 RTC_DateTypeDef dateStruct;
mbed_official 130:1dec54e4aec3 117 RTC_TimeTypeDef timeStruct;
mbed_official 130:1dec54e4aec3 118
mbed_official 130:1dec54e4aec3 119 // Convert the time into a tm
mbed_official 130:1dec54e4aec3 120 struct tm *timeinfo = localtime(&t);
mbed_official 130:1dec54e4aec3 121
mbed_official 130:1dec54e4aec3 122 // Fill RTC structures
mbed_official 130:1dec54e4aec3 123 dateStruct.RTC_WeekDay = timeinfo->tm_wday;
mbed_official 130:1dec54e4aec3 124 dateStruct.RTC_Month = timeinfo->tm_mon + 1;
mbed_official 130:1dec54e4aec3 125 dateStruct.RTC_Date = timeinfo->tm_mday;
mbed_official 130:1dec54e4aec3 126 dateStruct.RTC_Year = timeinfo->tm_year - 100;
mbed_official 130:1dec54e4aec3 127 timeStruct.RTC_Hours = timeinfo->tm_hour;
mbed_official 130:1dec54e4aec3 128 timeStruct.RTC_Minutes = timeinfo->tm_min;
mbed_official 130:1dec54e4aec3 129 timeStruct.RTC_Seconds = timeinfo->tm_sec;
mbed_official 130:1dec54e4aec3 130 timeStruct.RTC_H12 = RTC_HourFormat_24;
mbed_official 130:1dec54e4aec3 131
mbed_official 130:1dec54e4aec3 132 // Change the RTC current date/time
mbed_official 130:1dec54e4aec3 133 PWR_BackupAccessCmd(ENABLE); // Enable access to RTC
mbed_official 130:1dec54e4aec3 134 RTC_SetDate(RTC_Format_BIN, &dateStruct);
mbed_official 130:1dec54e4aec3 135 RTC_SetTime(RTC_Format_BIN, &timeStruct);
mbed_official 130:1dec54e4aec3 136 PWR_BackupAccessCmd(DISABLE); // Disable access to RTC
mbed_official 130:1dec54e4aec3 137 }