mbed library sources
Dependents: frdm_kl05z_gpio_test
Fork of mbed-src by
targets/hal/TARGET_STM/TARGET_NUCLEO_F103RB/rtc_api.c
- Committer:
- mbed_official
- Date:
- 2013-12-17
- Revision:
- 62:7731d679ae64
- Parent:
- 60:142c6c6f5949
- Child:
- 70:c1fbde68b492
File content as of revision 62:7731d679ae64:
/* mbed Microcontroller Library * Copyright (c) 2006-2013 ARM Limited * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ #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 }