键盘中断.txt

c语言程序

#include <reg51.h>
//LCD的口线
sbit E=P3^5;
sbit RW=P3^6;
sbit RS=P3^7;	

//8字LED的连接方法
//P0.7	P.06	P0.5	P0.4	P0.3	P0.2	P0.1	P0.0
// H      G	 F	 E	 D	 C	 B 	 A

unsigned char code ledcode[]={0xc0,0xf9,0xa4,0xb0,0x99,0x92,0x82,0xf8,	
			      0x80,0x90,0x88,0x83,0xc6,0xa1,0x86,0x8e};	//数码管段码表
void scankey(void);

void main(void)
{
	E=0;			//取消LCD对LED的影响
	RW=0;
	RS=1;
	P2=0xfe;		//用第一个8字数码管显示
	P0=0x8c;		//上电显示"P"
	while(1)
	{
		P1=0xfe;
		scankey();
		P1=0xfd;
		scankey();
		P1=0Xfb;
		scankey();
		P1=0xf7;
		scankey();
	}
}

void	scankey(void)
{
	switch(P1)
	{
		case 0xee:	{ P0=ledcode[1];}break; // 键 "1"
	 	case 0xde:	{ P0=ledcode[2];}break; // 键 "2"
	 	case 0xbe:	{ P0=ledcode[3];}break; // 键 "3
	 	case 0x7e: 	{ P0=ledcode[4];}break; // 键 "4"

		case 0xed:	{ P0=ledcode[5];}break; // 键 "5
	 	case 0xdd:	{ P0=ledcode[6];}break; // 键 "6
	 	case 0xbd:	{ P0=ledcode[7];}break; // 键 "7
	 	case 0x7d:	{ P0=ledcode[8];}break; // 键 "8

	 	case 0xeb:	{ P0=ledcode[9];}break; // 键 "9
	 	case 0xdb:	{ P0=ledcode[0];}break; // 键 "0
	 	case 0xbb:	{ 	        }break; // 键 "+
		case 0x7b:	{ 	        }break; // 键 "-

	 	case 0xe7:	{ P0=ledcode[10];}break; //键 "A"
	 	case 0xd7:	{ P0=ledcode[11];}break; //键 "B"
	 	case 0xb7:	{ P0=ledcode[12];}break; //键 "C"
	 	case 0x77:	{ P0=ledcode[13];}break; //键 "C"

	 	default: 	break;
	}
}