shao ziyang / mbed-src-kl05

mbed library sources

Dependents:   frdm_kl05z_gpio_test

Fork of mbed-src by mbed official

targets/hal/TARGET_STM/TARGET_DISCO_F100RB/rtc_api.c@323:9e901b0a5aa1, 2014-09-13 (annotated)

Committer:
shaoziyang
Date:
Sat Sep 13 14:25:46 2014 +0000
Revision:
323:9e901b0a5aa1
Parent:
126:549ba18ddd81 
test with CLOCK_SETUP = 0

Who changed what in which revision?

UserRevisionLine numberNew contents of line
mbed_official 126:549ba18ddd81 1 /* mbed Microcontroller Library
mbed_official 126:549ba18ddd81 2 *******************************************************************************
mbed_official 126:549ba18ddd81 3 * Copyright (c) 2014, STMicroelectronics
mbed_official 126:549ba18ddd81 4 * All rights reserved.
mbed_official 126:549ba18ddd81 5 *
mbed_official 126:549ba18ddd81 6 * Redistribution and use in source and binary forms, with or without
mbed_official 126:549ba18ddd81 7 * modification, are permitted provided that the following conditions are met:
mbed_official 126:549ba18ddd81 8 *
mbed_official 126:549ba18ddd81 9 * 1. Redistributions of source code must retain the above copyright notice,
mbed_official 126:549ba18ddd81 10 * this list of conditions and the following disclaimer.
mbed_official 126:549ba18ddd81 11 * 2. Redistributions in binary form must reproduce the above copyright notice,
mbed_official 126:549ba18ddd81 12 * this list of conditions and the following disclaimer in the documentation
mbed_official 126:549ba18ddd81 13 * and/or other materials provided with the distribution.
mbed_official 126:549ba18ddd81 14 * 3. Neither the name of STMicroelectronics nor the names of its contributors
mbed_official 126:549ba18ddd81 15 * may be used to endorse or promote products derived from this software
mbed_official 126:549ba18ddd81 16 * without specific prior written permission.
mbed_official 126:549ba18ddd81 17 *
mbed_official 126:549ba18ddd81 18 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
mbed_official 126:549ba18ddd81 19 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
mbed_official 126:549ba18ddd81 20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
mbed_official 126:549ba18ddd81 21 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
mbed_official 126:549ba18ddd81 22 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
mbed_official 126:549ba18ddd81 23 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
mbed_official 126:549ba18ddd81 24 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
mbed_official 126:549ba18ddd81 25 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
mbed_official 126:549ba18ddd81 26 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
mbed_official 126:549ba18ddd81 27 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
mbed_official 126:549ba18ddd81 28 *******************************************************************************
mbed_official 126:549ba18ddd81 29 */
mbed_official 126:549ba18ddd81 30 #include "rtc_api.h"
mbed_official 126:549ba18ddd81 31
mbed_official 126:549ba18ddd81 32 static int rtc_inited = 0;
mbed_official 126:549ba18ddd81 33
mbed_official 126:549ba18ddd81 34 void rtc_init(void) {
mbed_official 126:549ba18ddd81 35 RCC_APB1PeriphClockCmd(RCC_APB1Periph_PWR | RCC_APB1Periph_BKP, ENABLE); // Enable PWR and Backup clock
mbed_official 126:549ba18ddd81 36
mbed_official 126:549ba18ddd81 37 PWR_BackupAccessCmd(ENABLE); // Allow access to Backup Domain
mbed_official 126:549ba18ddd81 38
mbed_official 126:549ba18ddd81 39 BKP_DeInit(); // Reset Backup Domain
mbed_official 126:549ba18ddd81 40
mbed_official 126:549ba18ddd81 41 // Uncomment these lines if you use the LSE
mbed_official 126:549ba18ddd81 42 // Enable LSE and wait till it's ready
mbed_official 126:549ba18ddd81 43 //RCC_LSEConfig(RCC_LSE_ON);
mbed_official 126:549ba18ddd81 44 //while (RCC_GetFlagStatus(RCC_FLAG_LSERDY) == RESET) {}
mbed_official 126:549ba18ddd81 45 //RCC_RTCCLKConfig(RCC_RTCCLKSource_LSE); // Select LSE as RTC Clock Source
mbed_official 126:549ba18ddd81 46
mbed_official 126:549ba18ddd81 47 // Uncomment these lines if you use the LSI
mbed_official 126:549ba18ddd81 48 // Enable LSI and wait till it's ready
mbed_official 126:549ba18ddd81 49 RCC_LSICmd(ENABLE);
mbed_official 126:549ba18ddd81 50 while (RCC_GetFlagStatus(RCC_FLAG_LSIRDY) == RESET) {}
mbed_official 126:549ba18ddd81 51 RCC_RTCCLKConfig(RCC_RTCCLKSource_LSI); // Select LSI as RTC Clock Source
mbed_official 126:549ba18ddd81 52
mbed_official 126:549ba18ddd81 53 RCC_RTCCLKCmd(ENABLE); // Enable RTC Clock
mbed_official 126:549ba18ddd81 54
mbed_official 126:549ba18ddd81 55 RTC_WaitForSynchro(); // Wait for RTC registers synchronization
mbed_official 126:549ba18ddd81 56
mbed_official 126:549ba18ddd81 57 RTC_WaitForLastTask(); // Wait until last write operation on RTC registers has finished
mbed_official 126:549ba18ddd81 58
mbed_official 126:549ba18ddd81 59 // Set RTC period to 1 sec
mbed_official 126:549ba18ddd81 60 // For LSE: prescaler = RTCCLK/RTC period = 32768Hz/1Hz = 32768
mbed_official 126:549ba18ddd81 61 // For LSI: prescaler = RTCCLK/RTC period = 40000Hz/1Hz = 40000
mbed_official 126:549ba18ddd81 62 RTC_SetPrescaler(39999);
mbed_official 126:549ba18ddd81 63
mbed_official 126:549ba18ddd81 64 RTC_WaitForLastTask(); // Wait until last write operation on RTC registers has finished
mbed_official 126:549ba18ddd81 65
mbed_official 126:549ba18ddd81 66 rtc_inited = 1;
mbed_official 126:549ba18ddd81 67 }
mbed_official 126:549ba18ddd81 68
mbed_official 126:549ba18ddd81 69 void rtc_free(void) {
mbed_official 126:549ba18ddd81 70 RCC_DeInit(); // Resets the RCC clock configuration to the default reset state
mbed_official 126:549ba18ddd81 71 rtc_inited = 0;
mbed_official 126:549ba18ddd81 72 }
mbed_official 126:549ba18ddd81 73
mbed_official 126:549ba18ddd81 74 int rtc_isenabled(void) {
mbed_official 126:549ba18ddd81 75 return rtc_inited;
mbed_official 126:549ba18ddd81 76 }
mbed_official 126:549ba18ddd81 77
mbed_official 126:549ba18ddd81 78 time_t rtc_read(void) {
mbed_official 126:549ba18ddd81 79 return (time_t)RTC_GetCounter();
mbed_official 126:549ba18ddd81 80 }
mbed_official 126:549ba18ddd81 81
mbed_official 126:549ba18ddd81 82 void rtc_write(time_t t) {
mbed_official 126:549ba18ddd81 83 RTC_WaitForLastTask(); // Wait until last write operation on RTC registers has finished
mbed_official 126:549ba18ddd81 84 RTC_SetCounter(t); // Change the current time
mbed_official 126:549ba18ddd81 85 RTC_WaitForLastTask(); // Wait until last write operation on RTC registers has finished
mbed_official 126:549ba18ddd81 86 }