51单片机的出租车计价器C51程序

51单片机的出租车计价器C51程序

已通过模拟测试

#include;

unsigned char

cir_num,pwm_mach,temp,distance,wait_time,price,di stance;

unsigned int a,t;

sbit pwm_mach=P1^0;

sbit key_clean=P3^0;//定义按键位置

sbit key_stop=P3^1;

sbit key_cheak=P3^2;

sbit key_oneway=P3^3;

sbit key_doubleway=P3^4;

unsigned char code

led_buf[]={0x3F,0x06,0x5B,0x4F,0x66,0x6D,0x7D,0x0 7,0x7F,0x6F};

unsigned char code seg[]={0,1,2,3,4,5,6,7};//分别对应相应的数码管点亮

/************初始化定时器0******************/ void init_timer0()

{

TMOD=0x01;

TH0=0x3C;

TL0=0xAF;//定时50MS

EA=1;

ET0=1;

TR0=1;

}

/************初始化定时器1******************/ void init_timer1()

{

TMOD=0x10;

TH0=0x00;

TL0=0x00;

EA=1;

ET1=1;

TR1=1;

}

/************初始化定时器2******************/ void init_timer2()

{

RCAP2H = (65536-50000)/256;// 50ms 自动重载 RCAP2L = (65536-50000)%256;

ET2=1;

EA=1;

TR2=1;

}

/************定时器0中断******************/ void Timer0_isr(void) interrupt 1 using 1 {

TH0=0x3C;

TL0=0xAF;

if(a==20)//定时1s

{a=0;

if( cir_num