【电子信息工程毕业设计文献综述开题报告】基于单片机的教室照明控制系统设计(可编辑)

delay 10 ;

start ; //蜂鸣器鸣叫，红色LED闪烁 key 20;

while key! 10 //这时只有按下登录键（M），且重新输入正确的密码，才能解除警报

keyscan ;

/*****************键盘扫描***************/ void keyscan P3 0xf7;

temp P3;delay 2 ;temp P3; switch temp

case 0x77:key 1; break;

case 0xb7:key 2;

break;

case 0xd7:key 3; break;

case 0xe7:key 10; break;

while P3&0xf0 ! 0xf0 ; P3 0xfb;

temp P3;delay 2 ;temp P3; switch temp case 0x7b:key 4; break;

case 0xbb:key 5; break;

case 0xdb:key 6; break;

case 0xeb:key 11; break;

while P3&0xf0 ! 0xf0 ; P3 0xfd;

temp P3;delay 2 ;temp P3;

switch temp

case 0x7d:key 7; break;

case 0xbd:key 8; break;

case 0xdd:key 9 ; break;

case 0xed:key 12 ; break;

while P3&0xf0 ! 0xf0 ; P3 0xfe;

temp P3;delay 2 ;temp P3; switch temp

case 0x7e:key 0; break;

case 0xbe:key 14 ; break;

case 0xde:key 15 ; break;

case 0xee:key 13 ; break;

while P3&0xf0 ! 0xf0 ;

/***************中断初始化**************/ void start

TMOD 0x11;

TH0 65536-50000 /256; //定时50ms T 100ms TL0 65536-50000 %6; TH1 65536-50000 /256; TL1 65536-50000 %6; P0_0 1; P1_4 0; EA 1; ET0 1; TR0 1; ET1 1; TR1 1;

/***************定时器0***************/ void time0 interrupt 1