#include <reg51.h>#define u8 unsigned char 
#define u16 unsigned int #define GPIO_KEY P1sbit Key_Set = P1^0;
sbit Key_Add = P1^1;u8 k1,KeyValue_buf;
u8 KeyValue;   //按键值u8 gewei_volue=0;//个十百千位显示的值
u8 shiwei_volue=0;
u8 baiwei_volue=0;
u8 qianwei_volue=0;u8 mun=0;
u8 flag=0;
u8 key_num=0;//按键设置值 u8 wei_set=0;void delay(u16 time)
{u16 i,j;for(i=time;i>0;i--)	for(j=100;j>0;j--);	
}//位选
sbit ge		=P3^3;
sbit shi	=P3^2;
sbit bai	=P3^1;
sbit qian	=P3^0;u8 code bable[]={0xc0,0xf9,0xa4,0xb0,0x99,0x92,0x82,0xf8,0x80,0x90,0x88,0x83,0xc6,0xa1,0x86,0x8e,0xc0};u8 code bable_buf[];void T0_Init()
{TMOD =0x01;TH0  =(65536-5000)/255;TL0  =(65536-5000)%255;TR0  =1;ET0  =1;EA   =1;
}void T0_chuli() interrupt 1
{TH0  =(65536-5000)/255;TL0  =(65536-5000)%255;P3 = 1<<flag;switch(flag){case 0:	P2 = bable[qianwei_volue]; break;case 1:	P2 = bable[baiwei_volue]; break;case 2:	P2 = bable[shiwei_volue]; break;case 3:	P2 = bable[gewei_volue]; break;}flag++;if(flag==4){flag=0;}
}void Scan_Key()
{if(Key_Set==0)//按键位选{delay(150);if(Key_Set==0) {key_num++; while(!Key_Set);if(key_num==5){key_num=1;}switch(key_num){case 1:	 wei_set=1;   break;case 2:	 wei_set=2;   break;case 3:	 wei_set=3;   break;case 4:	 wei_set=4;	  break;}}}if(Key_Add==0)//显示＋{delay(200);if(Key_Add==0){
//		  mun++;
//		  if(mun==10)
//		  {
//		   mun=0;
//		  };}switch(wei_set){case 1:  gewei_volue   +=1;		if(gewei_volue>9) {gewei_volue=0;} break;case 2:	 shiwei_volue  +=1;		if(shiwei_volue>9) {shiwei_volue=0;} break;case 3:	 baiwei_volue  +=1;		if(baiwei_volue>9) {baiwei_volue=0;}break;case 4:	 qianwei_volue +=1;	  if(qianwei_volue>9) {qianwei_volue=0;}break;}while(!Key_Add);}
}/****************************************
*
*						10MS延时
*
****************************************/
void Delay10ms(void)   
{unsigned char a,b,c;for(c=1;c>0;c--)for(b=38;b>0;b--)for(a=130;a>0;a--);
}/*******************************************
*
*						键盘扫描
*
********************************************/
char  KeyDown(void)
{u8 a=0;GPIO_KEY=0x0f;if(GPIO_KEY!=0x0f)//行拉高{Delay10ms();//延时10ms消抖if(GPIO_KEY!=0x0f)//当有按键按下{//JIESHOU
//			GPIO_KEY=0X0F;switch(GPIO_KEY){case(0X0e):	KeyValue=0;break;case(0X0d):	KeyValue=1;break;case(0X0b): KeyValue=2;break;case(0X07):	KeyValue=3;break;}//列扫描GPIO_KEY=0XF0;switch(GPIO_KEY){case(0X70):	KeyValue=KeyValue+1;break;case(0Xb0):	KeyValue=KeyValue+5;break;case(0Xd0): KeyValue=KeyValue+9;break;case(0Xe0):	KeyValue=KeyValue+13;break;}while((a<200)&&(GPIO_KEY!=0xf0))	 //{Delay10ms();a++;}return KeyValue;}} else {return 0xff;}
}/*
按键处理  4位数码管键值处理
*/
void KeyDown_chuli(void)
{u8 val = KeyDown();if (val != 0xff) {qianwei_volue=baiwei_volue;baiwei_volue=shiwei_volue;shiwei_volue=gewei_volue;gewei_volue= val;}
}//共阳是数码管
void main()
{T0_Init();while(1){KeyDown_chuli();}
}