基于AT24C02的数字密码锁设计(STC89C52单片机).doc

基于AT24C02的数字密码锁设计(STC89C52单片机)S1-S10数字键0-9S13 更改密码 S14 进入密码锁S15 关闭密码锁（使数字键失效）初始密码：000000密码位数：6位（由宏定义设定）#includereg52.h#include intrins.h#define uchar unsigned char#define uint unsigned int#define nop4() _nop_();_nop_();_nop_();_nop_();#define N 6 /密码的位数在此更改sbit scl = P21; /时钟线sbit sda = P20; /数字线sbit rw = P11;sbit RS = P10; sbit LCDEN = P25;/sbit dula=P26;/sbit wela=P27;sbit D6=P17;uchar mimaN,inputN,resetN;uchar key,p=1;uint y,temp;void delayUs()/微秒级延时 _nop_();void delayMs(uint a) /毫秒级延时 uint i, j; for(i = a; i 0; i-) for(j = 100; j 0; j-);void start() /产生起始信号，sda下拉(scl高电平时) sda=1;scl=1;nop4();sda=0;nop4();scl=0;void stop() /产生结束信号，sda上拉(scl高电平时) sda=0;scl=1;nop4();sda=1;nop4();scl=0;void ack() /应答信号（每个字节前） sda=0;scl=1;nop4();sda=1;scl=0;void no_ack() /非应答信号（结束信号前） sda=1;scl=1;nop4();sda=0;scl=0;uchar Read_A_Byte()/读一个字节 uchar i,rd; for(i=0;i8;i+) scl=1;rd=1;rd|=sda;scl=0; return rd;void Write_A_Byte(uchar wd) /写一个字节 uchar i; for(i=0;i8;i+) wd=1;sda=CY;nop4();nop4();scl=1;scl=0; ack();void Write_Address_Byte(uchar add,uchar dat) /向地址写字节 start(); Write_A_Byte(0xa0); Write_A_Byte(add); Write_A_Byte(dat); stop(); nop4();uchar Read_Address_Byte(uchar addr)/从地址读字节 uchar dat; start(); Write_A_Byte(0xa0); Write_A_Byte(addr); stop(); start(); Write_A_Byte(0xa1); dat=Read_A_Byte(); no_ack(); stop(); return dat;void writeComm(uchar comm)/LCD写命令 RS = 0; P0 = comm; LCDEN = 1; delayUs(); LCDEN = 0; delayMs(1);void writeData(uchar dat)/写数据:RS=1, RW=0; RS = 1; P0 = dat; LCDEN = 1; delayUs(); LCDEN = 0; delayMs(1);void writeString(uchar * str, uchar length)/写字符串 uchar i; for(i = 0; i length; i+) writeData(stri); void LCDinit() /Lcd初始化 rw = 0; dula = wela = 0; /防止led管乱闪 writeComm(0x38);/设置16乘2显示 writeComm(0x0c);/开显示，不显示光标 writeComm(0x06);/输入模式，写一加一 writeComm(0x01);/清屏void keyscan4x4() /4乘4键盘扫描,逐行扫描 uchar temp;/第一行扫描/P3=0xfe;/1111 1110 让P3.0口输出低temp=P3;temp=temp&0xf0;/1111 0000位与操作 屏蔽后四位if(temp!=0xf0) delayMs(10);temp=P3;temp=temp&0xf0;if(temp!=0xf0) temp=P3;switch(temp) case 0xee: /1110 1110 S1被按下 key=0; break; case 0xde: /1101 1110 S2被按下 key=1; break; case 0xbe: /1011 1110 S3被按下 key=2; break; case 0x7e: /0111 1110 S4被按下 key=3; break;while(temp!=0xf0) temp=P3;temp=temp&0xf0;/第二行扫描/P3=0xfd;/1111 1101 让P3.1口输出低temp=P3;temp=temp&0xf0;/1111 0000位与操作 屏蔽后四位if(temp!=0xf0) delayMs(10);temp=P3;temp=temp&0xf0;if(temp!=0xf0) temp=P3;switch(temp) case 0xed: /1110 1101 S5被按下 key=4; break; case 0xdd: /1101 1101 S6被按下 key=5; break; case 0xbd: /1011 1101 S7被按下 key=6; break; case 0x7d: /0111 1101 S8被按下 key=7; break;while(temp!=0xf0) temp=P3;temp=temp&0xf0; /第三行扫描/P3=0xfb;/1111 1011 让P3.2口输出低temp=P3;temp=temp&0xf0;/1111 0000位与操作 屏蔽后四位if(temp!=0xf0) delayMs(10);temp=P3;temp=temp&0xf0;if(temp!=0xf0) temp=P3;switch(temp) case 0xeb: /1110 1011 S9被按下 key=8; break; case 0xdb: /1101 1011 S10被按下 key=9; break; case 0xbb: /1011 1011 S11被按下 key=10; break; case 0x7b: /0111 1011 S12被按下 key=11; break;while(temp!=0xf0) temp=P3;temp=temp&0xf0; /第四行扫描/P3=0xf7;/1111 0111 让P3.3口输出低temp=P3;temp=temp&0xf0;/1111 0000位与操作 屏蔽后四位if(temp!=0xf0) delayMs(10);temp=P3;temp=temp&0xf0;if(temp!=0xf0) temp=P3;switch(temp) case 0xe7: /1110 0111 S13被按下 key=12; break; case 0xd7: /1101 0111 S14被按下 key=13; break; case 0xb7: /1011 0111 S15被按下 key=14; break; case 0x77: /0111 0111 S16被按下 key=15; break;while(temp!=0xf0) temp=P3;temp=temp&0xf0; void main() uchar table1 =Enter password ; uchar table2 =Unlocked; uchar table3 =False ; uchar table4 =Locked ; uchar table5 =New password; uchar table6 =OK ; uchar table7 =True ; uchar table8 =Hold on ; /保持 for(y=0;yN;y+) Write_Address_Byte(y,0x00); /设置初始密码 掉电不记忆，重置000000 delayMs(3); mimay=Read_Address_Byte(y); /*for(y=0;yN;y+) /掉电记忆 mimay=Read_Address_Byte(y); delayMs(3); */ LCDinit(); writeComm(0x80); writeString(table8,16); while(1) keyscan4x4();if(key=13) uint j=0; uint x=0; writeComm(0x01); writeComm(0x80); writeString(table1,15); delayMs(100); while(j1) uint i=0; writeComm(0xc0); while(iN) keyscan4x4(); if(key10) inputi=key; writeData(0+key); i+; if(i=N) delayMs(500); key=15; j+; writeComm(0x01); writeComm(0x80); p=1; for(y=0;yN;y+) if(inputy!=mimay) p=0; if(p) writeComm(0x01); writeComm(0x80); writeString(table7,16);delayMs(900); writeComm(0x01); writeComm(0x80); writeString(table2,8); delayMs(500); D6=0; else writeString(table3,14); D6=1; else if(key=14) uint k=0; writeComm(0x01); writeComm(0x80); writeString(table4,16); /D6=1; while(k1) keyscan4x4();if(key=12|key=13) k+; else if(key=12) uint j=0; uint z=0; writeComm(0x01); writeComm(0x80); writeString(table1,16); D6=1; while(j1) uint i=0; writeComm(0xc0); while(iN) keyscan4x4(); if(key10) inputi=key; writeData(0+key); i+; if(i=N) delayMs(500); key=15; j+; writeComm(0x01); writeComm(0x80); p=1; for(y=0;yN;y+) if(inputy!=mimay) p=0; if(p) writeComm(0x01); writeComm(0x80); writeString(table5,12); delayMs(100); writeComm(0xc0); while(zN) keyscan4x4()