单片机学习笔记十二:外部中断INT0和INT1控制数码管加减

//main.c
/***********************************************************
程序功能：独立按键控制数码管数字增加减小
                 KEY1               INT0控制数码管数字增加
                 KEY2               INT1控制数码管数字减小
				*************************************************************/

#include <reg52.h>
#include "intrins.h"
#include "display.h"
#include "delay.h"
void EX0_Init();
void EX1_Init();
unsigned int NumCnt = 0;           //四位数码管显示的数
void main()
{	
	
	EX0_Init();
	EX1_Init();
	EA = 1;
	while(1)
	{	
		ledbuf[0] = NumCnt/1000;       //拆分NumCnt千位
	  ledbuf[1] = NumCnt/100%10;    //拆分NumCnt百位
	  ledbuf[2] = NumCnt/10%10;    //拆分NumCnt十位
		ledbuf[3] = NumCnt%10;       //拆分NumCnt个位
		Display();                   //数码管显示NumCnt
	}
}


void EX0_Init()//外部中断0初始化
{
	IT0 = 1;
	EX0 = 1;
}
void EX1_Init()//外部中断1初始化
{
	IT1 = 1;
	EX1 = 1;
}

void EX0_ISR() interrupt 0//外部中断0中断服务函数
{
	NumCnt++;
	if(NumCnt>9999)
	{
		NumCnt = 0;
	}
}

void EX1_ISR() interrupt 2//外部中断1中断服务函数
{
	NumCnt--;
	if(NumCnt>9999)
	{
		NumCnt = 9999;
	}
}

//display.c 数码管显示程序
#include <reg52.h>
#include "intrins.h"
#include "display.h"
unsigned char code leddata[]={
	              0x3F,  //"0"
                0x06,  //"1"
                0x5B,  //"2"
                0x4F,  //"3"
                0x66,  //"4"
                0x6D,  //"5"
                0x7D,  //"6"
                0x07,  //"7"
                0x7F,  //"8"
                0x6F,  //"9"
                0x77,  //"A"
                0x7C,  //"B"
                0x39,  //"C"
                0x5E,  //"D"
                0x79,  //"E"
                0x71,  //"F"
                0x76,  //"H"
                0x38,  //"L"
                0x37,  //"n"
                0x3E,  //"u"
                0x73,  //"P"
                0x5C,  //"o"
                0x40,  //"-"
                0x00,  //熄灭
							               };
//数码管断码表
unsigned char ledbuf[]={1,2,3,4};//数据显示缓冲区
unsigned char code PLACE_CODE[]={0xFE,0xFD,0xFB,0xF7};//位选信号
void Display()
{
	static unsigned char i=0;
	//1.送段码
	//2.送位码
	//3.延时1ms小于10ms
	//4.消隐
	switch(i)
		{
		 case 0:
			 GPI0_DIG = leddata[ledbuf[0]];
		   GPIO_PLACE = PLACE_CODE[0];
		   delay(1);
		   GPI0_DIG = 0x00;
		   i++;
		   break;
		 
		case 1:
			 GPI0_DIG = leddata[ledbuf[1]];
		   GPIO_PLACE = PLACE_CODE[1];
		   delay(1);
		   GPI0_DIG = 0x00;
		   i++;
		   break;
		case 2:
			 GPI0_DIG = leddata[ledbuf[2]];
		   GPIO_PLACE = PLACE_CODE[2];
		   delay(1);
		   GPI0_DIG = 0x00;
		   i++;
		   break;	
		case 3:
			 GPI0_DIG = leddata[ledbuf[3]];
		   GPIO_PLACE = PLACE_CODE[3];
		   delay(1);
		   GPI0_DIG = 0x00;
		   i=0;
		   break;	
		default:break;
		 }
}

#include <reg52.h>
#include "delay.h"

void delay(unsigned int xms)
{
	unsigned int x,y;
	for(x=xms;x>0;x--)
	{
	  for(y=127;y>0;y--);
	}
}

执行代码后，通过Proteus仿真的显示界面如下：