test / mbed-src

mbed library sources

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Fork of mbed-src by mbed official

targets/hal/TARGET_STM/TARGET_NUCLEO_F302R8/rtc_api.c@125:23cc3068a9e4, 2014-03-19 (annotated)

Committer:
mbed_official
Date:
Wed Mar 19 10:15:22 2014 +0000
Revision:
125:23cc3068a9e4
Synchronized with git revision ace35dfba3748c7cdc102eb38ec6b9e1067c3252



Full URL: https://github.com/mbedmicro/mbed/commit/ace35dfba3748c7cdc102eb38ec6b9e1067c3252/



[NUCLEO_F302R8] Add cmsis and hal files + change F401RE clock to 84MHz

Who changed what in which revision?

UserRevisionLine numberNew contents of line
mbed_official 125:23cc3068a9e4 1 /* mbed Microcontroller Library
mbed_official 125:23cc3068a9e4 2 *******************************************************************************
mbed_official 125:23cc3068a9e4 3 * Copyright (c) 2014, STMicroelectronics
mbed_official 125:23cc3068a9e4 4 * All rights reserved.
mbed_official 125:23cc3068a9e4 5 *
mbed_official 125:23cc3068a9e4 6 * Redistribution and use in source and binary forms, with or without
mbed_official 125:23cc3068a9e4 7 * modification, are permitted provided that the following conditions are met:
mbed_official 125:23cc3068a9e4 8 *
mbed_official 125:23cc3068a9e4 9 * 1. Redistributions of source code must retain the above copyright notice,
mbed_official 125:23cc3068a9e4 10 * this list of conditions and the following disclaimer.
mbed_official 125:23cc3068a9e4 11 * 2. Redistributions in binary form must reproduce the above copyright notice,
mbed_official 125:23cc3068a9e4 12 * this list of conditions and the following disclaimer in the documentation
mbed_official 125:23cc3068a9e4 13 * and/or other materials provided with the distribution.
mbed_official 125:23cc3068a9e4 14 * 3. Neither the name of STMicroelectronics nor the names of its contributors
mbed_official 125:23cc3068a9e4 15 * may be used to endorse or promote products derived from this software
mbed_official 125:23cc3068a9e4 16 * without specific prior written permission.
mbed_official 125:23cc3068a9e4 17 *
mbed_official 125:23cc3068a9e4 18 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
mbed_official 125:23cc3068a9e4 19 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
mbed_official 125:23cc3068a9e4 20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
mbed_official 125:23cc3068a9e4 21 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
mbed_official 125:23cc3068a9e4 22 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
mbed_official 125:23cc3068a9e4 23 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
mbed_official 125:23cc3068a9e4 24 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
mbed_official 125:23cc3068a9e4 25 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
mbed_official 125:23cc3068a9e4 26 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
mbed_official 125:23cc3068a9e4 27 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
mbed_official 125:23cc3068a9e4 28 *******************************************************************************
mbed_official 125:23cc3068a9e4 29 */
mbed_official 125:23cc3068a9e4 30 #include "rtc_api.h"
mbed_official 125:23cc3068a9e4 31
mbed_official 125:23cc3068a9e4 32 static int rtc_inited = 0;
mbed_official 125:23cc3068a9e4 33
mbed_official 125:23cc3068a9e4 34 void rtc_init(void) {
mbed_official 125:23cc3068a9e4 35 RCC_APB1PeriphClockCmd(RCC_APB1Periph_PWR, ENABLE); // Enable PWR clock
mbed_official 125:23cc3068a9e4 36
mbed_official 125:23cc3068a9e4 37 PWR_BackupAccessCmd(ENABLE); // Enable access to RTC
mbed_official 125:23cc3068a9e4 38
mbed_official 125:23cc3068a9e4 39 // Be sure to start correctly
mbed_official 125:23cc3068a9e4 40 RCC_BackupResetCmd(ENABLE);
mbed_official 125:23cc3068a9e4 41 RCC_BackupResetCmd(DISABLE);
mbed_official 125:23cc3068a9e4 42
mbed_official 125:23cc3068a9e4 43 // Note: the LSI is used as RTC source clock
mbed_official 125:23cc3068a9e4 44 // The RTC Clock may vary due to LSI frequency dispersion.
mbed_official 125:23cc3068a9e4 45 RCC_LSICmd(ENABLE); // Enable LSI
mbed_official 125:23cc3068a9e4 46
mbed_official 125:23cc3068a9e4 47 while (RCC_GetFlagStatus(RCC_FLAG_LSIRDY) == RESET) {} // Wait until ready
mbed_official 125:23cc3068a9e4 48
mbed_official 125:23cc3068a9e4 49 RCC_RTCCLKConfig(RCC_RTCCLKSource_LSI); // Select LSI as RTC Clock Source
mbed_official 125:23cc3068a9e4 50
mbed_official 125:23cc3068a9e4 51 RCC_RTCCLKCmd(ENABLE); // Enable RTC Clock
mbed_official 125:23cc3068a9e4 52
mbed_official 125:23cc3068a9e4 53 RTC_WaitForSynchro(); // Wait for RTC registers synchronization
mbed_official 125:23cc3068a9e4 54
mbed_official 125:23cc3068a9e4 55 uint32_t lsi_freq = 40000; // [TODO] To be measured precisely using a timer input capture
mbed_official 125:23cc3068a9e4 56
mbed_official 125:23cc3068a9e4 57 RTC_InitTypeDef RTC_InitStructure;
mbed_official 125:23cc3068a9e4 58 RTC_InitStructure.RTC_AsynchPrediv = 127;
mbed_official 125:23cc3068a9e4 59 RTC_InitStructure.RTC_SynchPrediv = (lsi_freq / 128) - 1;
mbed_official 125:23cc3068a9e4 60 RTC_InitStructure.RTC_HourFormat = RTC_HourFormat_24;
mbed_official 125:23cc3068a9e4 61 RTC_Init(&RTC_InitStructure);
mbed_official 125:23cc3068a9e4 62
mbed_official 125:23cc3068a9e4 63 rtc_inited = 1;
mbed_official 125:23cc3068a9e4 64 }
mbed_official 125:23cc3068a9e4 65
mbed_official 125:23cc3068a9e4 66 void rtc_free(void) {
mbed_official 125:23cc3068a9e4 67 RCC_DeInit(); // Resets the RCC clock configuration to the default reset state
mbed_official 125:23cc3068a9e4 68 rtc_inited = 0;
mbed_official 125:23cc3068a9e4 69 }
mbed_official 125:23cc3068a9e4 70
mbed_official 125:23cc3068a9e4 71 int rtc_isenabled(void) {
mbed_official 125:23cc3068a9e4 72 return rtc_inited;
mbed_official 125:23cc3068a9e4 73 }
mbed_official 125:23cc3068a9e4 74
mbed_official 125:23cc3068a9e4 75 /*
mbed_official 125:23cc3068a9e4 76 RTC Registers
mbed_official 125:23cc3068a9e4 77 RTC_WeekDay 1=monday, 2=tuesday, ..., 7=sunday
mbed_official 125:23cc3068a9e4 78 RTC_Month 1=january, 2=february, ..., 12=december
mbed_official 125:23cc3068a9e4 79 RTC_Date day of the month 1-31
mbed_official 125:23cc3068a9e4 80 RTC_Year year 0-99
mbed_official 125:23cc3068a9e4 81 struct tm
mbed_official 125:23cc3068a9e4 82 tm_sec seconds after the minute 0-61
mbed_official 125:23cc3068a9e4 83 tm_min minutes after the hour 0-59
mbed_official 125:23cc3068a9e4 84 tm_hour hours since midnight 0-23
mbed_official 125:23cc3068a9e4 85 tm_mday day of the month 1-31
mbed_official 125:23cc3068a9e4 86 tm_mon months since January 0-11
mbed_official 125:23cc3068a9e4 87 tm_year years since 1900
mbed_official 125:23cc3068a9e4 88 tm_wday days since Sunday 0-6
mbed_official 125:23cc3068a9e4 89 tm_yday days since January 1 0-365
mbed_official 125:23cc3068a9e4 90 tm_isdst Daylight Saving Time flag
mbed_official 125:23cc3068a9e4 91 */
mbed_official 125:23cc3068a9e4 92 time_t rtc_read(void) {
mbed_official 125:23cc3068a9e4 93 RTC_DateTypeDef dateStruct;
mbed_official 125:23cc3068a9e4 94 RTC_TimeTypeDef timeStruct;
mbed_official 125:23cc3068a9e4 95 struct tm timeinfo;
mbed_official 125:23cc3068a9e4 96
mbed_official 125:23cc3068a9e4 97 // Read actual date and time
mbed_official 125:23cc3068a9e4 98 RTC_GetTime(RTC_Format_BIN, &timeStruct);
mbed_official 125:23cc3068a9e4 99 RTC_GetDate(RTC_Format_BIN, &dateStruct);
mbed_official 125:23cc3068a9e4 100
mbed_official 125:23cc3068a9e4 101 // Setup a tm structure based on the RTC
mbed_official 125:23cc3068a9e4 102 timeinfo.tm_wday = dateStruct.RTC_WeekDay;
mbed_official 125:23cc3068a9e4 103 timeinfo.tm_mon = dateStruct.RTC_Month - 1;
mbed_official 125:23cc3068a9e4 104 timeinfo.tm_mday = dateStruct.RTC_Date;
mbed_official 125:23cc3068a9e4 105 timeinfo.tm_year = dateStruct.RTC_Year + 100;
mbed_official 125:23cc3068a9e4 106 timeinfo.tm_hour = timeStruct.RTC_Hours;
mbed_official 125:23cc3068a9e4 107 timeinfo.tm_min = timeStruct.RTC_Minutes;
mbed_official 125:23cc3068a9e4 108 timeinfo.tm_sec = timeStruct.RTC_Seconds;
mbed_official 125:23cc3068a9e4 109
mbed_official 125:23cc3068a9e4 110 // Convert to timestamp
mbed_official 125:23cc3068a9e4 111 time_t t = mktime(&timeinfo);
mbed_official 125:23cc3068a9e4 112
mbed_official 125:23cc3068a9e4 113 return t;
mbed_official 125:23cc3068a9e4 114 }
mbed_official 125:23cc3068a9e4 115
mbed_official 125:23cc3068a9e4 116 void rtc_write(time_t t) {
mbed_official 125:23cc3068a9e4 117 RTC_DateTypeDef dateStruct;
mbed_official 125:23cc3068a9e4 118 RTC_TimeTypeDef timeStruct;
mbed_official 125:23cc3068a9e4 119
mbed_official 125:23cc3068a9e4 120 // Convert the time into a tm
mbed_official 125:23cc3068a9e4 121 struct tm *timeinfo = localtime(&t);
mbed_official 125:23cc3068a9e4 122
mbed_official 125:23cc3068a9e4 123 // Fill RTC structures
mbed_official 125:23cc3068a9e4 124 dateStruct.RTC_WeekDay = timeinfo->tm_wday;
mbed_official 125:23cc3068a9e4 125 dateStruct.RTC_Month = timeinfo->tm_mon + 1;
mbed_official 125:23cc3068a9e4 126 dateStruct.RTC_Date = timeinfo->tm_mday;
mbed_official 125:23cc3068a9e4 127 dateStruct.RTC_Year = timeinfo->tm_year - 100;
mbed_official 125:23cc3068a9e4 128 timeStruct.RTC_Hours = timeinfo->tm_hour;
mbed_official 125:23cc3068a9e4 129 timeStruct.RTC_Minutes = timeinfo->tm_min;
mbed_official 125:23cc3068a9e4 130 timeStruct.RTC_Seconds = timeinfo->tm_sec;
mbed_official 125:23cc3068a9e4 131 timeStruct.RTC_H12 = RTC_HourFormat_24;
mbed_official 125:23cc3068a9e4 132
mbed_official 125:23cc3068a9e4 133 // Change the RTC current date/time
mbed_official 125:23cc3068a9e4 134 PWR_BackupAccessCmd(ENABLE); // Enable access to RTC
mbed_official 125:23cc3068a9e4 135 RTC_SetDate(RTC_Format_BIN, &dateStruct);
mbed_official 125:23cc3068a9e4 136 RTC_SetTime(RTC_Format_BIN, &timeStruct);
mbed_official 125:23cc3068a9e4 137 PWR_BackupAccessCmd(DISABLE); // Disable access to RTC
mbed_official 125:23cc3068a9e4 138 }