#include <STC15F2K60S2.H>
#include "intrins.h"
#define u8 unsigned char   //定义一个全局常量

u8 code smgduan[]={0xff,0xf9,0xa4,0xb0,0x99,0x92,0x82,0xf8,0x80,0x90,0xc0};//共阴 段码表 P0
u8 code smgwei[]={0x01,0x02,0x04,0x08,0x10,0x20,0x40};//位码表 P2
//u8 code smgbuff[]={0x10,0x10,0x10,0x10,0x10,0x10};		//数码管缓冲区，初值0x10是为了让数码管右下角的点不亮
u8 Number1,Number2,Number3,Number4,Number5,Number6;	 //	用来存储号码
u8 k = 0;          //定义全局变量

void Delay1ms();  //声明延时程序
void Delay20ms();

/*数码管显示函数*/
void smg_display()	
{
	 Number1 = P1&0x0f;		//读取电话输入的数值，并把高四位置0		
    if(k >= 1)  P0 = smgduan[Number1]; P2 = smgwei[0]; Delay1ms(); P0 = 0xff;  //
    if(k >= 2)  P0 = smgduan[Number2]; P2 = smgwei[1]; Delay1ms(); P0 = 0xff;
    if(k >= 3)  P0 = smgduan[Number3]; P2 = smgwei[2]; Delay1ms(); P0 = 0xff;
    if(k >= 4)  P0 = smgduan[Number4]; P2 = smgwei[3]; Delay1ms(); P0 = 0xff;
    if(k >= 5)  P0 = smgduan[Number5]; P2 = smgwei[4]; Delay1ms(); P0 = 0xff;
    if(k >= 6)  P0 = smgduan[Number6]; P2 = smgwei[5]; Delay1ms(); P0 = 0xff;
		
}


/*主函数*/
void main()
{						  
	EA =1 ;   //中断总开关打开
	EX0 = 1;	//外部中断0中断允许位打开
	IT0 = 1;	//设置外部中断0为下降沿触发
	 
	while(1)		
	{											
		smg_display();		//循环数码管显示函数	
	}
}

/*外部中断0函数*/
void exint0() interrupt 0		
{
	
	if(!P32)					//检测中断请求
	{
		Delay20ms();		//延时消抖
		if(!P32)				
		{
			k++;				//k自加
			if(k > 6)			
			{
				k = 1;		 	//重置k
			}				  
		 Number6=Number5;Number5=Number4;Number4=Number3;  //把已经读取的按键值传递到下一个变量让数码管显示
		 Number3=Number2;Number2=Number1; 
		}
		while(!P32);	//等待按键松开
	}
}

/*延时函数*/
void Delay1ms()		//@12.000MHz 延时程序1ms
{
	unsigned char i, j;

	i = 12;
	j = 169;
	do
	{
		while (--j);
	} while (--i);
}

void Delay20ms()		//@12.000MHz 延时程序20ms
{
	unsigned char i, j, k;

	_nop_();
	_nop_();
	i = 1;
	j = 234;
	k = 113;
	do
	{
		do
		{
			while (--k);
		} while (--j);
	} while (--i);
}