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