[自学实验][二]4x4矩阵开关识别

只看该作者 · 2020-10-29 15:52

本帖最后由 liziride 于 2020-10-29 16:01 编辑

4x4矩阵开关识别控制对应的led等,按下亮,松开灭

#include<reg51.h>
unsigned char row=0,col=0;
//循环调用
void a002_002() {
unsigned char val=16;
      unsigned char tmp=0x01;
P1 = 0xF0;
if(P1 != 0xF0) {
      P1 = 0x0F;
      row=P1;
      P1 = 0xF0;
      col=P1;
      switch(row | col) {
                     case 0xEE:val = 0;break;//14
                     case 0xDE:val = 1;break;//13
                     case 0xBE:val = 2;break;//11
                     case 0x7E:val = 3;break;//7
                     case 0xED:val = 4;break;
                     case 0xDD:val = 5;break;
                     case 0xBD:val = 6;break;
                     case 0x7D:val = 7;break;
                     case 0xEB:val = 8;break;
                     case 0xDB:val = 9;break;
                     case 0xBB:val = 10;break;
                     case 0x7B:val = 11;break;
                     case 0xE7:val = 12;break;
                     case 0xD7:val = 13;break;
                     case 0xB7:val = 14;break;
                     case 0x77:val = 15;break;
                     default:val = 16;break;
      }
}
if(val < 8) {
            tmp = tmp << val;
            P2 = ~tmp & P2;
} else if(val < 16) {
      val -= 8;
            tmp = tmp << val;
            P3 = ~tmp & P3;
}else {
            P2=0xFF;
            P3=0xFF;
      }
}