1_单片机_settingxod_矩阵式键盘识别_源码

#include <reg52.h> //52系列单片机头文件 #define uchar unsigned char #define uint unsigned int sbit dula=P2^6; //申明U1锁存器的锁存端 sbit wela=P2^7; //申明U2锁存器的锁存端 uchar code table[]={ 0x3f,0x06,0x5b,0x4f, 0x66,0x6d,0x7d,0x07, 0x7f,0x6f,0x77,0x7c, 0x39,0x5e,0x79,0x71}; void delayms(uint xms) { uint i,j; for(i=xms;i>0;i--) //i=xms即延时约xms毫秒 for(j=110;j>0;j--); } void display(uchar num) { P0=table[num]; //显示函数只送段选数据 dula=1; dula=0; } void matrixkeyscan() { uchar temp,key; P1=0xfe; temp=P1; temp=temp&0xf0; if(temp!=0xf0) { delayms(10); temp=P1; temp=temp&0xf0; if(temp!=0xf0) { temp=P1; switch(temp) { case 0xee: key=0; break; case 0xde: key=1; break; case 0xbe: key=2; break; case 0x7e: key=3; break; } while(temp!=0xf0) { temp=P1; temp=temp&0xf0; } display(key); } } P1=0xfd; temp=P1; temp=temp&0xf0; if(temp!=0xf0) { delayms(10); temp=P1; temp=temp&0xf0; if(temp!=0xf0) { temp=P1; switch(temp) { case 0xed: key=4; break; case 0xdd: key=5; break; case 0xbd: key=6; break; case 0x7d: key=7; break; } while(temp!=0xf0) { temp=P1; temp=temp&0xf0; } display(key); } } P1=0xfb; temp=P1; temp=temp&0xf0; if(temp!=0xf0) { delayms(10); temp=P1; temp=temp&0xf0; if(temp!=0xf0) { temp=P1; switch(temp) { case 0xeb: key=8; break; case 0xdb: key=9; break; case 0xbb: key=10; break; case 0x7b: key=11; break; } while(temp!=0xf0) { temp=P1; temp=temp&0xf0; } display(key); } } P1=0xf7; temp=P1; temp=temp&0xf0; if(temp!=0xf0) { delayms(10); temp=P1; temp=temp&0xf0; if(temp!=0xf0) { temp=P1; switch(temp) { case 0xe7: key=12; break; case 0xd7: key=13; break; case 0xb7: key=14; break; case 0x77: key=15; break; } while(temp!=0xf0) { temp=P1; temp=temp&0xf0; } display(key); } } } void main() { P0=0; //关闭所有数码管段选 dula=1; dula=0; P0=0xc0;//位选中所有数码管 wela=1; wela=0; while(1) { matrixkeyscan();//不停调用键盘扫描程序 } }