mbed library sources
Dependents: frdm_kl05z_gpio_test
Fork of mbed-src by
targets/hal/TARGET_STM/TARGET_NUCLEO_F302R8/rtc_api.c
- Committer:
- shaoziyang
- Date:
- 2014-09-13
- Revision:
- 323:9e901b0a5aa1
- Parent:
- 216:577900467c9e
File content as of revision 323:9e901b0a5aa1:
/* 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" #if DEVICE_RTC #include "wait_api.h" #define LSE_STARTUP_TIMEOUT ((uint16_t)500) // delay in ms static int rtc_inited = 0; void rtc_init(void) { uint32_t StartUpCounter = 0; uint32_t LSEStatus = 0; uint32_t rtc_freq = 0; RCC_APB1PeriphClockCmd(RCC_APB1Periph_PWR, ENABLE); // Enable PWR clock PWR_BackupAccessCmd(ENABLE); // Enable access to Backup domain // Reset back up registers RCC_BackupResetCmd(ENABLE); RCC_BackupResetCmd(DISABLE); // Enable LSE clock RCC_LSEConfig(RCC_LSE_ON); // Wait till LSE is ready do { LSEStatus = RCC_GetFlagStatus(RCC_FLAG_LSERDY); wait_ms(1); StartUpCounter++; } while ((LSEStatus == 0) && (StartUpCounter <= LSE_STARTUP_TIMEOUT)); if (StartUpCounter > LSE_STARTUP_TIMEOUT) { // The LSE has not started, use LSI instead. // The RTC Clock may vary due to LSI frequency dispersion. RCC_LSEConfig(RCC_LSE_OFF); RCC_LSICmd(ENABLE); // Enable LSI while (RCC_GetFlagStatus(RCC_FLAG_LSIRDY) == RESET) {} // Wait until ready RCC_RTCCLKConfig(RCC_RTCCLKSource_LSI); // Select the RTC Clock Source rtc_freq = 40000; // [TODO] To be measured precisely using a timer input capture } else { // The LSE has correctly started RCC_RTCCLKConfig(RCC_RTCCLKSource_LSE); // Select the RTC Clock Source rtc_freq = LSE_VALUE; } RCC_RTCCLKCmd(ENABLE); // Enable RTC Clock RTC_WaitForSynchro(); // Wait for RTC registers synchronization RTC_InitTypeDef RTC_InitStructure; RTC_InitStructure.RTC_AsynchPrediv = 127; RTC_InitStructure.RTC_SynchPrediv = (rtc_freq / 128) - 1; RTC_InitStructure.RTC_HourFormat = RTC_HourFormat_24; RTC_Init(&RTC_InitStructure); PWR_BackupAccessCmd(DISABLE); // Disable access to Backup domain rtc_inited = 1; } void rtc_free(void) { // Reset RTC PWR_BackupAccessCmd(ENABLE); // Enable access to Backup Domain RTC_DeInit(); RCC_BackupResetCmd(ENABLE); RCC_BackupResetCmd(DISABLE); // Disable RTC, LSE and LSI clocks RCC_RTCCLKCmd(DISABLE); RCC_LSEConfig(RCC_LSE_OFF); RCC_LSICmd(DISABLE); 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 } #endif