#include "bsp.h"
#include "exti_io.h"

void WakeUp_EXIT_Config( void )
{
  GPIO_InitTypeDef GPIO_InitStructure;
  NVIC_InitTypeDef NVIC_InitStructure;
  EXTI_InitTypeDef EXTI_InitStructure;
  //enable GPIOA Clock
  RCC_AHBPeriphClockCmd(RCC_AHBPeriph_GPIOA, ENABLE);
  // config PA10 as input floating
  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0;
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN;
  GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_DOWN;    //very import
  GPIO_Init(GPIOA, &GPIO_InitStructure);
  
  //enable syscfg clock
  RCC_APB2PeriphClockCmd(RCC_APB2Periph_SYSCFG, ENABLE);
  // connect EXTI0 line to PA0 pin
  SYSCFG_EXTILineConfig(EXTI_PortSourceGPIOA, EXTI_PinSource0);
 
  //config EXTI10 Line
  EXTI_InitStructure.EXTI_Line = EXTI_Line0;
  EXTI_InitStructure.EXTI_Mode = EXTI_Mode_Interrupt;
  EXTI_InitStructure.EXTI_Trigger = EXTI_Trigger_Rising;  
  EXTI_InitStructure.EXTI_LineCmd = ENABLE;
  EXTI_Init(&EXTI_InitStructure);
 
  // enable and set EXTI0 interrupu to the lowest priority
  NVIC_InitStructure.NVIC_IRQChannel = EXTI0_IRQn;
  NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0x01;
  NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0x00;
  NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
  NVIC_Init(&NVIC_InitStructure);
  PWR_WakeUpPinCmd(PWR_WakeUpPin_1,ENABLE);
}
 
//检测WKUP脚的信号
//返回值1:连续按下3s以上
//      0:错误的触发	
u8 Check_WKUP(void) 
{
	u8 t=0;	//记录按下的时间
	
	while(1)
	{
		if(WKUP_KD)
		{
			t++;			//已经按下了 
			delay_ms(30);
			if(t>=100)		//按下超过3秒钟
			{
				
				return 1; 	//按下3s以上了
			}
		}else 
		{ 
			
			return 0; //按下不足3秒
		}
	}
} 
void EXTI0_IRQHandler( void )
{
  EXTI_ClearITPendingBit(EXTI_Line10);  //Clear the EXTI line 10 pending bit 
  if(Check_WKUP()==0)//关机?
	{		  
    Wake_Up_Flag=0;
		PWR_EnterSTANDBYMode();   //进入待机（STANDBY）模式  
	}else
  {
    Wake_Up_Flag=1;
  }
}