mbed library sources
Dependents: frdm_kl05z_gpio_test
Fork of mbed-src by
Diff: targets/hal/TARGET_STM/TARGET_DISCO_F100RB/rtc_api.c
- Revision:
- 126:549ba18ddd81
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/targets/hal/TARGET_STM/TARGET_DISCO_F100RB/rtc_api.c Wed Mar 19 16:00:09 2014 +0000 @@ -0,0 +1,86 @@ +/* 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 +}