mbed library sources
Dependents: frdm_kl05z_gpio_test
Fork of mbed-src by
Diff: targets/hal/TARGET_STM/TARGET_NUCLEO_F103RB/rtc_api.c
- Revision:
- 60:142c6c6f5949
- Child:
- 62:7731d679ae64
diff -r ef93cc6bbf65 -r 142c6c6f5949 targets/hal/TARGET_STM/TARGET_NUCLEO_F103RB/rtc_api.c --- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/targets/hal/TARGET_STM/TARGET_NUCLEO_F103RB/rtc_api.c Tue Dec 17 08:45:10 2013 +0000 @@ -0,0 +1,65 @@ +/* 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 + + // 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 + + 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 + // RTC period = RTCCLK/RTC_PR = (32.768 KHz)/(32767+1) + RTC_SetPrescaler(32767); + + 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 +}