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/*MCU:STC89C52*/
/*Designed by: Y.Q.Bi*/
#include <reg52.h>
#include <intrins.h>
#define uchar unsigned char
#define uint unsigned int
uchar code table[]={0xc0,0xf9,0xa4,0xb0,
0x99,0x92,0x82,0xf8,0x80,0x90,0x88,0x83,0xC6,0xA1,0x86,0x8E};//共陰數碼管顯示代碼
void Key_scan(void);
void delay(uint d);
void main(void) //主程序
{
while(1)
{
Key_scan();
P1=0xf7;
delay(2000);
}
}
void Key_scan(void) //確定按鍵子程序
{
uchar key,readkey,x_temp,y_temp;
P2=0x0f;
x_temp=P2&0x0f; //確定哪一行按鍵按下
if(x_temp==0x0f) goto keyout;
P2=0xf0;
y_temp=P2&0xf0; //確定哪一列按鍵按下
readkey=x_temp|y_temp; //確定具體的按鍵按下
switch(readkey)
{
case 0xee:key=0;P0=table[key]; break;
case 0xde:key=1;P0=table[key]; break;
case 0xbe:key=2;P0=table[key]; break;
case 0x7e:key=3;P0=table[key]; break;
case 0xed:key=4;P0=table[key]; break;
case 0xdd:key=5;P0=table[key]; break;
case 0xbd:key=6;P0=table[key]; break;
case 0x7d:key=7;P0=table[key]; break;
case 0xeb:key=8;P0=table[key]; break;
case 0xdb:key=9;P0=table[key]; break;
case 0xbb:key=10;P0=table[key];break;
case 0x7b:key=11;P0=table[key];break;
case 0xe7:key=12;P0=table[key];break;
case 0xd7:key=13;P0=table[key];break;
case 0xb7:key=14;P0=table[key];break;
case 0x77:key=15;P0=table[key];break;
default:break;
}
keyout:_nop_();
}
void delay(uint d) //延時子程序
{
while(--d);
}
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