#include <rtthread.h>
#include <stm32f10x.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, rt_uint8_t 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         : None
*******************************************************************************/
void RTC_Configuration(void)
{
  /* 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)
  {
  }

  /* 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();
}

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");
		RTC_Configuration();
	}
	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.private = RT_NULL;
	
	rt_device_register(&rtc, "rtc", RT_DEVICE_FLAG_RDWR);

	return;
}

#include <time.h>
time_t time(time_t* t)
{
	rt_device_t device;
	time_t time;
	
	device = rt_device_find("rtc");
	if (device != RT_NULL)
	{
		rt_device_control(device, RT_DEVICE_CTRL_RTC_GET_TIME, &time);
		if (t != RT_NULL) *t = time;
	}
	
	return time;
}

#ifdef RT_USING_FINSH
#include <finsh.h>
void set_date(rt_uint32_t year, rt_uint32_t month, rt_uint32_t day)
{
	time_t now;
	struct tm* ti;
	rt_device_t device;
	
	ti = RT_NULL;
	/* get current time */
	time(&now);
	
	ti = localtime(&now);
	if (ti != RT_NULL)
	{
		ti->tm_year = year - 1900;
		ti->tm_mon 	= month;
		ti->tm_mday = day;
	}
	
	now = mktime(ti);
	
	device = rt_device_find("rtc");
	if (device != RT_NULL)
	{
		rt_rtc_control(device, RT_DEVICE_CTRL_RTC_SET_TIME, &now);
	}
}
FINSH_FUNCTION_EXPORT(set_date, set date)

void set_time(rt_uint32_t hour, rt_uint32_t minute, rt_uint32_t second)
{
	time_t now;
	struct tm* ti;
	rt_device_t device;

	ti = RT_NULL;
	/* get current time */
	time(&now);
	
	ti = localtime(&now);
	if (ti != RT_NULL)
	{
		ti->tm_hour = hour;
		ti->tm_min 	= minute;
		ti->tm_sec 	= second;
	}
	
	now = mktime(ti);
	device = rt_device_find("rtc");
	if (device != RT_NULL)
	{
		rt_rtc_control(device, RT_DEVICE_CTRL_RTC_SET_TIME, &now);
	}
}
FINSH_FUNCTION_EXPORT(set_time, set second)

void list_date()
{
	time_t now;
	
	time(&now);
	rt_kprintf("%s\n", ctime(&now));
}
FINSH_FUNCTION_EXPORT(list_date, set date)
#endif