用24C04与1602LCD设计电子密码锁完全代码

#include #include #include #include #include #include

#define uchar unsigned char #define uint unsigned int

//上次按键和当前按键序号，该矩阵中序号范围0~15,16表示无按键 uchar pre_keyno=16,keyno=16; uchar code Title_Text[]="your password...";//标题字符串 uchar DSY_BUFFER[16]=" ";//显示缓冲 uchar userpassword[7]=" ";//用户输入的密码 uchar IIC_Password[7]; uchar IS_Valid_User = 0; uchar i = 0; void Beep(); uchar Clear_Password();

sbit LED_OPEN = P2^0;//开锁灯亮 sbit BEEP = P3^7;//蜂鸣器

//=================================================== //延时................ void delay(uint x) { uchar i; while (x--) for(i=0;i<120;i++); } //蜂鸣器子程序 void beep() { uchar i; for(i=0;i<100;i++) { BEEP=~ BEEP; } BEEP=0; } // 清除密码 void clear_password() { uchar i; for(i=0; i<6; i++) { userpassword[i] =' '; DSY_BUFFER[i] =' '; } } // 主程序初始化 void init_main() { P0 = 0xFF; P1 = 0xFF; P2 = 0xFF;

TMOD = 0x02; //T0设置为8位自动重装模式 TH0 = 175; TL0 = 175; TR0 = 1; //启动T0

delay(10); lcd_init(); IIC_24C04_Init(); //初始化24C04 } // 键盘执行功能 void key_main() {

P1 = 0xF0; if(P1 != 0xF0) keyno = keys_scan(); //扫描键盘获取键序号KeyNo if(pre_keyno != keyno) { if(i<=6) { switch ( keyno ) { case 0: case 1: case 2: case 3: case 4: case 5: case 6: case 7: case 8: case 9:

//if ( i<= 6 ) //密码限制在6位以内 // { //如果i为0则执行一次清屏 if (i == 0) display_string(" ",0x40); userpassword[i] = keyno + '0'; userpassword[i+1] = ' ';

//DSY_BUFFER[i] = userpassword[i]; DSY_BUFFER[i] = '*'; DSY_BUFFER[i+1] = ' ';

display_string(DSY_BUFFER,0x40); i++; // } break;

case 10: //按A键开锁 if (strcmp(userpassword,IIC_Password) == 0) { LED_OPEN = 0; //点亮LED Clear_Password(); display_string("Unlock OK! ",0x40); IS_Valid_User = 1; } else { LED_OPEN =1; //关闭LED Clear_Password(); display_string("ERROR ! ",0x40); IS_Valid_User = 0; } i = 0;

break;

case 11: //按B键上锁 LED_OPEN =1; Clear_Password(); display_string(Title_Text,0x00); display_string(" ",0x40); i = 0;

IS_Valid_User = 0; break;

case 12: //按C键设置新密码 //如果是合法用户则提示输入新密码 if ( !IS_Valid_User ) display_string("No rights !",0x40); else { i = 0;

display_string("New Password: ",0x00); display_string(" ",0x40); }

break;

case 13: //按D键保存新密码 if ( !IS_Valid_User ) display_string("No rights !",0x40); else { sendstring(0xa0, 0 , userpassword, 6);

//重新读入刚写的密码 recstring(0xa0, 0 , IIC_Password, 6); IIC_Password[6] = ' ';

i = 0;

display_string(Title_Text,0x00); display_string("Password Saved! ",0x40); }

break;

case 14: //按E键消除所有输入 i = 0;

Clear_Password(); display_string(" ",0x40); } } beep(); pre_keyno = keyno;

} // delay(100); // Beep(); delay(100); P1= 0xF0; while (P1 != 0xF0); //如果有键未释放则等待 while (P1 == 0xF0); //如果没有再次按下按键则等待 } //===================================================================== // 主程序 //----------------------------------------------------------------- //原始程序中相邻两位密码不能相同. //本压缩包中的HEX由修改后的新程序编译生成,允许输入任意密码. //----------------------------------------------------------------- //实训100例中本例内的main函数可用以下代码替换. //改动的主要是main函数中while循环内的代码. //----------------------------------------------------------------- // 主程序 //----------------------------------------------------------------- void main() {

init_main(); display_string(Title_Text,0x00); //在第1行显示标题

//24C04的内容已由初始化BIN文件导入 //将24C04中预先写入的密码读入pass recstring(0xa0, 0 , IIC_Password, 6); IIC_Password[6] = '\0';

while(1) { key_main(); // P1= 0xF0; // while (P1 != 0xF0); //如果有键未释放则等待 // while (P1 == 0xF0); //如果没有再次按下按键则等待 } }

#ifndef __LCD1602_H__ #define __LCD1602_H__

#include #define uint unsigned int #define uchar unsigned char

sbit rs = P2^1; sbit rw = P2^2; sbit eq = P2^3;

void delay_lcd(uchar n)