164 lines
4.0 KiB
C
164 lines
4.0 KiB
C
/*
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* File : stm32f1_rtc.c
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* This file is part of RT-Thread RTOS
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* COPYRIGHT (C) 2009, RT-Thread Development Team
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*
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* The license and distribution terms for this file may be
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* found in the file LICENSE in this distribution or at
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* http://www.rt-thread.org/license/LICENSE
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*
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* Change Logs:
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* Date Author Notes
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* 2009-01-05 Bernard the first version.
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* 2011-11-26 aozima implementation time.
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* 2015-07-16 FlyM rename rtc to stm32f1_rtc. remove finsh export function
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*/
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#include <rtthread.h>
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#include <stm32f10x.h>
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#include "stm32f1_rtc.h"
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static struct rt_device rtc;
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static rt_err_t rt_rtc_open(rt_device_t dev, rt_uint16_t oflag)
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{
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if (dev->rx_indicate != RT_NULL)
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{
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/* Open Interrupt */
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}
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return RT_EOK;
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}
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static rt_size_t rt_rtc_read(rt_device_t dev, rt_off_t pos, void* buffer, rt_size_t size)
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{
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return 0;
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}
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static rt_err_t rt_rtc_control(rt_device_t dev, int cmd, void *args)
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{
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rt_time_t *time;
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RT_ASSERT(dev != RT_NULL);
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switch (cmd)
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{
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case RT_DEVICE_CTRL_RTC_GET_TIME:
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time = (rt_time_t *)args;
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/* read device */
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*time = RTC_GetCounter();
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break;
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case RT_DEVICE_CTRL_RTC_SET_TIME:
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{
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time = (rt_time_t *)args;
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/* Enable PWR and BKP clocks */
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RCC_APB1PeriphClockCmd(RCC_APB1Periph_PWR | RCC_APB1Periph_BKP, ENABLE);
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/* Allow access to BKP Domain */
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PWR_BackupAccessCmd(ENABLE);
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/* Wait until last write operation on RTC registers has finished */
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RTC_WaitForLastTask();
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/* Change the current time */
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RTC_SetCounter(*time);
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/* Wait until last write operation on RTC registers has finished */
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RTC_WaitForLastTask();
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BKP_WriteBackupRegister(BKP_DR1, 0xA5A5);
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}
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break;
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}
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return RT_EOK;
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}
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/*******************************************************************************
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* Function Name : RTC_Configuration
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* Description : Configures the RTC.
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* Input : None
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* Output : None
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* Return : 0 reday,-1 error.
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*******************************************************************************/
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int RTC_Configuration(void)
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{
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u32 count=0x200000;
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/* Enable PWR and BKP clocks */
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RCC_APB1PeriphClockCmd(RCC_APB1Periph_PWR | RCC_APB1Periph_BKP, ENABLE);
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/* Allow access to BKP Domain */
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PWR_BackupAccessCmd(ENABLE);
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/* Reset Backup Domain */
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BKP_DeInit();
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/* Enable LSE */
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RCC_LSEConfig(RCC_LSE_ON);
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/* Wait till LSE is ready */
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while ( (RCC_GetFlagStatus(RCC_FLAG_LSERDY) == RESET) && (--count) );
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if ( count == 0 )
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{
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return -1;
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}
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/* Select LSE as RTC Clock Source */
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RCC_RTCCLKConfig(RCC_RTCCLKSource_LSE);
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/* Enable RTC Clock */
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RCC_RTCCLKCmd(ENABLE);
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/* Wait for RTC registers synchronization */
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RTC_WaitForSynchro();
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/* Wait until last write operation on RTC registers has finished */
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RTC_WaitForLastTask();
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/* Set RTC prescaler: set RTC period to 1sec */
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RTC_SetPrescaler(32767); /* RTC period = RTCCLK/RTC_PR = (32.768 KHz)/(32767+1) */
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/* Wait until last write operation on RTC registers has finished */
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RTC_WaitForLastTask();
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return 0;
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}
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void rt_hw_rtc_init(void)
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{
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rtc.type = RT_Device_Class_RTC;
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if (BKP_ReadBackupRegister(BKP_DR1) != 0xA5A5)
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{
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rt_kprintf("rtc is not configured\n");
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rt_kprintf("please configure with set_date and set_time\n");
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if ( RTC_Configuration() != 0)
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{
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rt_kprintf("rtc configure fail...\r\n");
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return ;
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}
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}
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else
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{
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/* Wait for RTC registers synchronization */
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RTC_WaitForSynchro();
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}
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/* register rtc device */
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rtc.init = RT_NULL;
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rtc.open = rt_rtc_open;
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rtc.close = RT_NULL;
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rtc.read = rt_rtc_read;
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rtc.write = RT_NULL;
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rtc.control = rt_rtc_control;
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/* no private */
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rtc.user_data = RT_NULL;
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rt_device_register(&rtc, "rtc", RT_DEVICE_FLAG_RDWR);
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return;
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}
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