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/* mbed Microcontroller Library
*******************************************************************************
* Copyright (c) 2014, STMicroelectronics
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
* 3. Neither the name of STMicroelectronics nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*******************************************************************************
*/
#include "rtc_api.h"
static int rtc_inited = 0;
void rtc_init(void) {
RCC_APB1PeriphClockCmd(RCC_APB1Periph_PWR, ENABLE); // Enable PWR clock
PWR_BackupAccessCmd(ENABLE); // Enable access to RTC
// Be sure to start correctly
RCC_BackupResetCmd(ENABLE);
RCC_BackupResetCmd(DISABLE);
// Note: the LSI is used as RTC source clock
// The RTC Clock may vary due to LSI frequency dispersion.
RCC_LSICmd(ENABLE); // Enable LSI
while (RCC_GetFlagStatus(RCC_FLAG_LSIRDY) == RESET) {} // Wait until ready
RCC_RTCCLKConfig(RCC_RTCCLKSource_LSI); // Select LSI as RTC Clock Source
RCC_RTCCLKCmd(ENABLE); // Enable RTC Clock
RTC_WaitForSynchro(); // Wait for RTC registers synchronization
uint32_t lsi_freq = 40000; // [TODO] To be measured precisely using a timer input capture
RTC_InitTypeDef RTC_InitStructure;
RTC_InitStructure.RTC_AsynchPrediv = 127;
RTC_InitStructure.RTC_SynchPrediv = (lsi_freq / 128) - 1;
RTC_InitStructure.RTC_HourFormat = RTC_HourFormat_24;
RTC_Init(&RTC_InitStructure);
rtc_inited = 1;
}
void rtc_free(void) {
RCC_DeInit(); // Resets the RCC clock configuration to the default reset state
rtc_inited = 0;
}
int rtc_isenabled(void) {
return rtc_inited;
}
/*
RTC Registers
RTC_WeekDay 1=monday, 2=tuesday, ..., 7=sunday
RTC_Month 1=january, 2=february, ..., 12=december
RTC_Date day of the month 1-31
RTC_Year year 0-99
struct tm
tm_sec seconds after the minute 0-61
tm_min minutes after the hour 0-59
tm_hour hours since midnight 0-23
tm_mday day of the month 1-31
tm_mon months since January 0-11
tm_year years since 1900
tm_wday days since Sunday 0-6
tm_yday days since January 1 0-365
tm_isdst Daylight Saving Time flag
*/
time_t rtc_read(void) {
RTC_DateTypeDef dateStruct;
RTC_TimeTypeDef timeStruct;
struct tm timeinfo;
// Read actual date and time
RTC_GetTime(RTC_Format_BIN, &timeStruct);
RTC_GetDate(RTC_Format_BIN, &dateStruct);
// Setup a tm structure based on the RTC
timeinfo.tm_wday = dateStruct.RTC_WeekDay;
timeinfo.tm_mon = dateStruct.RTC_Month - 1;
timeinfo.tm_mday = dateStruct.RTC_Date;
timeinfo.tm_year = dateStruct.RTC_Year + 100;
timeinfo.tm_hour = timeStruct.RTC_Hours;
timeinfo.tm_min = timeStruct.RTC_Minutes;
timeinfo.tm_sec = timeStruct.RTC_Seconds;
// Convert to timestamp
time_t t = mktime(&timeinfo);
return t;
}
void rtc_write(time_t t) {
RTC_DateTypeDef dateStruct;
RTC_TimeTypeDef timeStruct;
// Convert the time into a tm
struct tm *timeinfo = localtime(&t);
// Fill RTC structures
dateStruct.RTC_WeekDay = timeinfo->tm_wday;
dateStruct.RTC_Month = timeinfo->tm_mon + 1;
dateStruct.RTC_Date = timeinfo->tm_mday;
dateStruct.RTC_Year = timeinfo->tm_year - 100;
timeStruct.RTC_Hours = timeinfo->tm_hour;
timeStruct.RTC_Minutes = timeinfo->tm_min;
timeStruct.RTC_Seconds = timeinfo->tm_sec;
timeStruct.RTC_H12 = RTC_HourFormat_24;
// Change the RTC current date/time
PWR_BackupAccessCmd(ENABLE); // Enable access to RTC
RTC_SetDate(RTC_Format_BIN, &dateStruct);
RTC_SetTime(RTC_Format_BIN, &timeStruct);
PWR_BackupAccessCmd(DISABLE); // Disable access to RTC
}
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