C51单片机密码锁（4×4矩阵键盘+虚拟终端）

#include <reg51.h> #include <stdio.h> #include <string.h> #define uchar unsigned char #define uint unsigned int void initUart(void); void delay100us(void); void readKey(void); uint i=0,j=0; uint cord_line,cord_column,result; uchar value; uchar code num[]={'0','1','2','3','4','5','6','7','8','9','A','B','C','D','E','F'}; //定义0~F字符数组 uchar password[20]={0}; //初始化密码数组 uchar check[20]="ABCDEF"; //密码箱预设的密码 void main(void) //主函数 { IE = 0x83; //开启全局中断、定时器0中断和外部0中断 TCON = 0x01; //设置外部中断0下降沿触发 initUart(); //串口初始化 TMOD = 0x21; //定时器1方式2，定时器0方式1 while(1){ readKey(); //读取按键 printf("The value entered is:%c\n",value); //输出输入的按键值 } } void readKey(void) //读取按键函数 { while(1){ P1 = 0x0F; cord_line = P1 & 0x0F; //读取键盘行数 if(cord_line != 0x0F){ delay100us(); //去抖 if(cord_line != 0x0F){ P1 = 0xF0; cord_column = P1 & 0xF0; //读取键盘列数 result=cord_line + cord_column;//高四位0的所在位数是列数，第四位0的所在位数的行数，从右往左分别为1~4 switch(result) //根据键盘行数和列数相加得到的值，匹配相应字符值 {case 0xEE: value = num[0]; break; case 0xDE: value = num[1]; break; case 0xBE: value = num[2]; break; case 0x7E: value = num[3]; break; case 0xED: value = num[4]; break; case 0xDD: value = num[5]; break; case 0xBD: value = num[6]; break; case 0x7D: value = num[7]; break; case 0xEB: value = num[8]; break; case 0xDB: value = num[9]; break; case 0xBB: value = num[10]; break; case 0x7B: value = num[11]; break; case 0xE7: value = num[12]; break; case 0xD7: value = num[13]; break; case 0xB7: value = num[14]; break; case 0x77: value = num[15]; break; default: printf("Error\n"); break; } while(1){ //卡住函数，松开按键才能继续执行，将得到的字符值输入密码数组中 if(P1==0XF0){ password[i]=value; i++; break; } } break; } } } } void enter() interrupt 0 //外部中断0输入键函数 { printf("The password you entered is:%s\n",password); //输出输入的密码 if(strcmp(password,check) == 0){ //比较输入的密码和密码箱预设的密码，一致则提示密码正确，点亮LED灯30S printf("The password is correct,welcome!\n"); P0 = 0xFE; //打开LED灯 TR0 = 1; //开启定时器0 TH0 = 0x94; TL0 = 0x00; j=0; //刷新LED灯亮时间 } else{ printf("The password is wrong,please enter again!\n"); //比较输入的密码和密码箱预设的密码，不一致则提示密码错误重新输入 } for(i;i>0;i--){password[i-1]=0;} //清空输入的密码 } void time0() interrupt 1 //定时器0中断函数 { TH0 = 0x94; TL0 = 0x00; j++; if(j==1000){ //30秒 P0 = 0xFF; //关闭LED灯 TR0 = 0; //关闭定时器0 } } void initUart(void) { TMOD = 0x20; SCON = 0x50; TH1 = 0xFD; TL1 = TH1; TI=1; TR1 = 1; } void delay100us(void) { unsigned char a,b; for(b=3;b>0;b--) for(a=1;a>0;a--); }