exti.c

STM32+ov7670

#include "exti.h"
#include "led.h"
#include "key.h"
#include "delay.h"
#include "usart.h"

#include "MyUSART.h"
#include "FIFO.h"
//Mini STM32开发板
//外部中断 驱动代码			 
  

//外部中断0服务程序
void EXTI0_IRQHandler(void)
{
	/*delay_ms(10);//消抖
	if(KEY2==1)	 //按键2
	{
		LED0=!LED0;
		LED1=!LED1;	
	}		 
	EXTI->PR=1<<0;  //清除LINE0上的中断标志位  */
}

//外部中断15~10服务程序
unsigned char VsyncCnt	= 0;
void EXTI15_10_IRQHandler(void)
{			
	EXTI->PR=1<<13;     //清除LINE13上的中断标志位  
	if(VsyncCnt < 2)
	{
		VsyncCnt ++;
	}
	if(VsyncCnt == 1)
	{
		FIFO_WEN_H;						//场同步有效后打开FIFO写使能			
	}
	else if(VsyncCnt == 2)
	{
		FIFO_WEN_L;
	}

}
//外部中断初始化程序
//初始化PA0,PA13,PA15为中断输入.
void EXTIX_Init(void)
{
	RCC->APB2ENR|=1<<4;     //使能PORTC时钟
	//RCC->APB2ENR|=1<<0;     //开启辅助时钟		  
	//AFIO->MAPR&=0XF8FFFFFF; //清除MAPR的[26:24]
	//AFIO->MAPR|=0X04000000; //关闭JTAG	    

	//GPIOA->CRL&=0XFFFFFFF0;//PA0设置成输入	  
	//GPIOA->CRL|=0X00000008;   
	GPIOC->CRH&=0XFF0FFFFF;//PC设置成输入	  
	GPIOC->CRH|=0X00800000; 				   
	GPIOC->ODR|=1<<13;	   //PC上拉


	Ex_NVIC_Config(GPIO_C,13,RTIR);//上降沿触发

	//MY_NVIC_Init(2,2,EXTI0_IRQChannel,2);    //抢占2，子优先级2，组2
	MY_NVIC_Init(2,1,EXTI15_10_IRQChannel,2);//抢占2，子优先级1，组2	   
}