單片機c語言之矩陣按鍵

#include#define uint unsigned int#define uchar unsigned charsbit dula=P2^6;sbit wela=P2^7;uchar code table[]={0x00,0x3f,0x06,0x5b,0x4f,0x66,0x6d,0x7d,0x07,0x7f,0x6f,0x77,0x7c,0x39,0x5e,0x79,0x71,0};uchar num,temp,num1;    void delay(uint z) {uint x,y;for(x=z;x>0;x--)for(y=110;y>0;y--);    }uchar keyscan(); void main(){ num1=17;dula=1;P0=0;dula=0;wela=1;P0=0x00;wela=0;while(1){num1=keyscan(); dula=1;P0=table[num1];dula=0;         }}uchar keyscan(){ P3=0xfe;temp=P3;temp=temp&0xf0;while(temp!=0xf0){  delay(5);temp=P3;temp=temp&0xf0;while(temp!=0xf0){   temp=P3;// 退出循環switch(temp){case 0x7e:num=1;break;case 0xbe:num=2;break;case 0xde:num=3;break;case 0xee:num=4;break; }while(temp!=0xf0){temp=P3;temp=temp&0xf0;}      // 松手檢測}}P3=0xfd;temp=P3;temp=temp&0xf0;while(temp!=0xf0){  delay(5);temp=P3;temp=temp&0xf0;while(temp!=0xf0){   temp=P3;switch(temp){case 0x7d:num=5;break;case 0xbd:num=6;break;case 0xdd:num=7;break;case 0xed:num=8;break; }while(temp!=0xf0){temp=P3;temp=temp&0xf0;}      // 松手檢測}}P3=0xfb;temp=P3;temp=temp&0xf0;while(temp!=0xf0){  delay(5);temp=P3;temp=temp&0xf0;while(temp!=0xf0){   temp=P3;switch(temp){case 0x7b:num=9;break;case 0xbb:num=10;break;case 0xdb:num=11;break;case 0xeb:num=12;break; }while(temp!=0xf0){temp=P3;temp=temp&0xf0;}      // 松手檢測}} P3=0xf7;temp=P3;temp=temp&0xf0;while(temp!=0xf0){  delay(5);temp=P3;temp=temp&0xf0;while(temp!=0xf0){   temp=P3;switch(temp){case 0x77:num=13;break;case 0xb7:num=14;break;case 0xd7:num=15;break;case 0xe7:num=16;break; }while(temp!=0xf0){temp=P3;temp=temp&0xf0;}      // 松手檢測}}return num;}