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targets/hal/TARGET_STM/TARGET_NUCLEO_F103RB/rtc_api.c
- Committer:
- mbed_official
- Date:
- 2014-01-07
- Revision:
- 70:c1fbde68b492
- Parent:
- 62:7731d679ae64
File content as of revision 70:c1fbde68b492:
/* 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 | RCC_APB1Periph_BKP, ENABLE); // Enable PWR and Backup clock PWR_BackupAccessCmd(ENABLE); // Allow access to Backup Domain BKP_DeInit(); // Reset Backup Domain // Uncomment these lines if you use the LSE // Enable LSE and wait till it's ready //RCC_LSEConfig(RCC_LSE_ON); //while (RCC_GetFlagStatus(RCC_FLAG_LSERDY) == RESET) {} //RCC_RTCCLKConfig(RCC_RTCCLKSource_LSE); // Select LSE as RTC Clock Source // Uncomment these lines if you use the LSI // Enable LSI and wait till it's ready RCC_LSICmd(ENABLE); while (RCC_GetFlagStatus(RCC_FLAG_LSIRDY) == RESET) {} RCC_RTCCLKConfig(RCC_RTCCLKSource_LSI); // Select LSI as RTC Clock Source RCC_RTCCLKCmd(ENABLE); // Enable RTC Clock RTC_WaitForSynchro(); // Wait for RTC registers synchronization RTC_WaitForLastTask(); // Wait until last write operation on RTC registers has finished // Set RTC period to 1 sec // For LSE: prescaler = RTCCLK/RTC period = 32768Hz/1Hz = 32768 // For LSI: prescaler = RTCCLK/RTC period = 40000Hz/1Hz = 40000 RTC_SetPrescaler(39999); RTC_WaitForLastTask(); // Wait until last write operation on RTC registers has finished 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; } time_t rtc_read(void) { return (time_t)RTC_GetCounter(); } void rtc_write(time_t t) { RTC_WaitForLastTask(); // Wait until last write operation on RTC registers has finished RTC_SetCounter(t); // Change the current time RTC_WaitForLastTask(); // Wait until last write operation on RTC registers has finished }