基于51单片机矩阵键盘的实现（含仿真原理图）

#include <reg51.h> #define uchar unsigned char uchar code leddata[]={0x3f,0x06,0x5b,0x4f,0x66,0x6d,0x7d,0x07,0x7f,0x6f,0x77,0x7c,0x39,0x5e,0x79,0x71,0x73}; uchar code RowCode[]={0xfe,0xfd,0xfb,0xf7}; uchar key=16; void scan(void) { uchar i,temp; //粗扫 P1=0xf0;//高4位为列线（输入线），低4位为行线（输出线） temp=P1&0xf0; if(temp!=0xf0) { for(i=0;i<200;i++); //消抖 temp=P1&0xf0; if(temp!=0xf0) { P1=0XFE; //细扫 temp=P1&0XF0;//确定按键所在列号 switch(temp) { case 0xe0:key=0;break; case 0xd0:key=1;break; case 0xb0:key=2;break; case 0x70:key=3;break; } P1=0XFD; //细扫 temp=P1&0XF0;//确定按键所在列号 switch(temp) { case 0xe0:key=4;break; case 0xd0:key=5;break; case 0xb0:key=6;break; case 0x70:key=7;break; } P1=0XFB; //细扫 temp=P1&0XF0;//确定按键所在列号 switch(temp) { case 0xe0:key=8;break; case 0xd0:key=9;break; case 0xb0:key=10;break; case 0x70:key=11;break; } P1=0XF7; //细扫 temp=P1&0XF0;//确定按键所在列号 switch(temp) { case 0xe0:key=12;break; case 0xd0:key=13;break; case 0xb0:key=14;break; case 0x70:key=15;break; } while(P1&0XF0!=0XF0); } } } void main(void) { while(1) { scan(); P2=leddata[key]; } }