超声波倒车报警器(7)

uint time; Trig1=0;

TMOD=0x01; //设置T0为计时器工作方式1

EA=0; //关中断 Trig1=1; //发出声波 delay12us(); Trig1=0; succeed_flag=0;

EA=1; // TH0=0; TL0=0;

while(Echo1 == 0); // EX0=1;

TR0=1; // delay(14); // TR0=0; EX0=0;

if(succeed_flag == 1){ // time=timeH*256+timeL; distance1=time*speed; }

if(succeed_flag == 0){ // distance1=30;

}

}

void measure2() //{

开中断， 等待回波电平 计时开始 等待电平跳变 测距成功，计算距离 测距不成功，赋值 测距2，同上 30

uint time;

Trig2=0; TMOD=0x10; EA=0; Trig2=1; delay12us(); Trig2=0; succeed_flag=0; EA=1;

TH1=0; TL1=0; while(Echo2 == 0); EX1=1;

TR1=1; delay(14); TR1=0; EX1=0;

if(succeed_flag == 1){ time=timeH*256+timeL; distance2=time*speed; } if(succeed_flag == 0){ distance2=30; }

}

void timerstop1() interrupt 0 // {

外中断0，对应T0 31

EX0=0; timeH =TH0; timeL =TL0; succeed_flag=1; }

void timerstop2() interrupt 2 //外中断1，对应T1 { EX1=0;

timeH =TH1; timeL =TL1; succeed_flag=1; }

//************lcd显示部分*************

void write_com(uchar com){ }

void write_dat(uchar com){

lcdrs=0; //写入指令 P0=com;

delay(5); //短暂延时 lcden=1; delay(5); lcden=0;

lcdrs=1; //写入数据

32

P0=com; delay(5); lcden=1; delay(5); lcden=0;

}

void lcd_init(){ lcden=0;

write_com(0x38); // write_com(0x0c); // write_com(0x06); // write_com(0x01); //}

void displaynum(uchar temp){ write_com(0x80+0x40); // write_dat(temp/10+0x30); // write_dat(0x2e);

write_dat(temp+0x30);

}

void displaynum2(uchar temp){ write_com(0x80+0x44); write_dat(temp/10+0x30); write_dat(0x2e);

write_dat(temp+0x30);

设置16*2显示，5*7点阵，8位数据接口开显示，不现实光标 写一个字符后地址加一 显示清零，指针清零

显示位置第二行 数字变换为ASCII码 33

}

void displaynum3(uchar temp){ }

void displayword(uchar *temp){ }

//***************DS18B20**************

write_com(0x80); //显示位置第一行 while(*temp != 0){ write_dat(*temp); temp++; }

write_com(0x80+0x48); write_dat(temp/10+0x30); write_dat(temp+0x30);

void dswrite(uchar dat) {

uint i; uchar j; bit testb; for(j=1;j<=8;j++) {

testb=dat&0x01; dat=dat>>1; if(testb)

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