mirror of https://github.com/ARMmbed/mbed-os.git
delet rtc_api.c
Marcomissyou
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/* mbed Microcontroller Library
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*******************************************************************************
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* Copyright (c) 2014, STMicroelectronics
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* 1. Redistributions of source code must retain the above copyright notice,
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* this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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* 3. Neither the name of STMicroelectronics nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*******************************************************************************
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*/
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#include "rtc_api.h"
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#if DEVICE_RTC
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#include "wait_api.h"
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#define LSE_STARTUP_TIMEOUT ((uint16_t)500) // delay in ms
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static int rtc_inited = 0;
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void rtc_init(void) {
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uint32_t StartUpCounter = 0;
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uint32_t LSEStatus = 0;
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uint32_t rtc_freq = 0;
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RCC_APB1PeriphClockCmd(RCC_APB1Periph_PWR, ENABLE); // Enable PWR clock
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PWR_BackupAccessCmd(ENABLE); // Enable access to Backup domain
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// Reset back up registers
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RCC_BackupResetCmd(ENABLE);
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RCC_BackupResetCmd(DISABLE);
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// Enable LSE clock
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RCC_LSEConfig(RCC_LSE_ON);
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// Wait till LSE is ready
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do {
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LSEStatus = RCC_GetFlagStatus(RCC_FLAG_LSERDY);
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wait_ms(1);
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StartUpCounter++;
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} while ((LSEStatus == 0) && (StartUpCounter <= LSE_STARTUP_TIMEOUT));
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if (StartUpCounter > LSE_STARTUP_TIMEOUT) {
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// The LSE has not started, use LSI instead.
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// The RTC Clock may vary due to LSI frequency dispersion.
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RCC_LSEConfig(RCC_LSE_OFF);
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RCC_LSICmd(ENABLE); // Enable LSI
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while (RCC_GetFlagStatus(RCC_FLAG_LSIRDY) == RESET) {} // Wait until ready
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RCC_RTCCLKConfig(RCC_RTCCLKSource_LSI); // Select the RTC Clock Source
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rtc_freq = 40000; // [TODO] To be measured precisely using a timer input capture
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} else {
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// The LSE has correctly started
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RCC_RTCCLKConfig(RCC_RTCCLKSource_LSE); // Select the RTC Clock Source
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rtc_freq = LSE_VALUE;
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}
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RCC_RTCCLKCmd(ENABLE); // Enable RTC Clock
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RTC_WaitForSynchro(); // Wait for RTC registers synchronization
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RTC_InitTypeDef RTC_InitStructure;
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RTC_InitStructure.RTC_AsynchPrediv = 127;
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RTC_InitStructure.RTC_SynchPrediv = (rtc_freq / 128) - 1;
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RTC_InitStructure.RTC_HourFormat = RTC_HourFormat_24;
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RTC_Init(&RTC_InitStructure);
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PWR_BackupAccessCmd(DISABLE); // Disable access to Backup domain
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rtc_inited = 1;
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}
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void rtc_free(void) {
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// Reset RTC
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PWR_BackupAccessCmd(ENABLE); // Enable access to Backup Domain
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RTC_DeInit();
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RCC_BackupResetCmd(ENABLE);
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RCC_BackupResetCmd(DISABLE);
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// Disable RTC, LSE and LSI clocks
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RCC_RTCCLKCmd(DISABLE);
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RCC_LSEConfig(RCC_LSE_OFF);
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RCC_LSICmd(DISABLE);
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rtc_inited = 0;
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}
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int rtc_isenabled(void) {
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return rtc_inited;
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}
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/*
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RTC Registers
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RTC_WeekDay 1=monday, 2=tuesday, ..., 7=sunday
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RTC_Month 1=january, 2=february, ..., 12=december
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RTC_Date day of the month 1-31
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RTC_Year year 0-99
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struct tm
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tm_sec seconds after the minute 0-61
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tm_min minutes after the hour 0-59
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tm_hour hours since midnight 0-23
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tm_mday day of the month 1-31
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tm_mon months since January 0-11
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tm_year years since 1900
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tm_wday days since Sunday 0-6
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tm_yday days since January 1 0-365
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tm_isdst Daylight Saving Time flag
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*/
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time_t rtc_read(void) {
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RTC_DateTypeDef dateStruct;
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RTC_TimeTypeDef timeStruct;
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struct tm timeinfo;
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// Read actual date and time
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RTC_GetTime(RTC_Format_BIN, &timeStruct);
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RTC_GetDate(RTC_Format_BIN, &dateStruct);
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// Setup a tm structure based on the RTC
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timeinfo.tm_wday = dateStruct.RTC_WeekDay;
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timeinfo.tm_mon = dateStruct.RTC_Month - 1;
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timeinfo.tm_mday = dateStruct.RTC_Date;
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timeinfo.tm_year = dateStruct.RTC_Year + 100;
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timeinfo.tm_hour = timeStruct.RTC_Hours;
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timeinfo.tm_min = timeStruct.RTC_Minutes;
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timeinfo.tm_sec = timeStruct.RTC_Seconds;
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// Convert to timestamp
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time_t t = mktime(&timeinfo);
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return t;
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}
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void rtc_write(time_t t) {
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RTC_DateTypeDef dateStruct;
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RTC_TimeTypeDef timeStruct;
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// Convert the time into a tm
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struct tm *timeinfo = localtime(&t);
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// Fill RTC structures
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dateStruct.RTC_WeekDay = timeinfo->tm_wday;
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dateStruct.RTC_Month = timeinfo->tm_mon + 1;
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dateStruct.RTC_Date = timeinfo->tm_mday;
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dateStruct.RTC_Year = timeinfo->tm_year - 100;
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timeStruct.RTC_Hours = timeinfo->tm_hour;
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timeStruct.RTC_Minutes = timeinfo->tm_min;
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timeStruct.RTC_Seconds = timeinfo->tm_sec;
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timeStruct.RTC_H12 = RTC_HourFormat_24;
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// Change the RTC current date/time
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PWR_BackupAccessCmd(ENABLE); // Enable access to RTC
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RTC_SetDate(RTC_Format_BIN, &dateStruct);
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RTC_SetTime(RTC_Format_BIN, &timeStruct);
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PWR_BackupAccessCmd(DISABLE); // Disable access to RTC
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}
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#endif
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