基于单片机控制的出租车计价器

#include<reg51.h> //---重定义关键词---// #define uchar unsigned char #define uint unsigned int typedef unsigned char uint8; typedef unsigned int uint16; sbit rs=P3^5; // 数据命令选择 sbit rw=P3^6; //读写选择 sbit e=P3^4; //使能 void Lcd1602_Delay1ms(uint16 i); void LcdWriteCom(uchar com); void LcdWriteData(uchar dat); void LcdInit(); void LCDWrite_String(uchar x, uchar y, uchar *s); void LCD_set_xy(uchar x, uchar y); sbit Baffle=P3^2; //传感器接口 sbit K2=P3^3; sbit K3=P3^0; //乘客上车后按一下启动 sbit K4=P3^1; //乘客下车后按一下清除 float danjia=1.5; uchar ext=0; float zongjia=0,wait; uchar keren_state=0; int Time=0,sec,min; char sensor; uchar int0_time=0; float distance=0; //单位m void init(); void jisuan(); void Delay10ms(unsigned int c) { unsigned char a,b; for(;c>0;c--) for(b=38;b>0;b--) for(a=130;a>0;a--); } void main() { init(); LcdInit(); LCDWrite_String(0, 0,"L:"); LcdWriteCom(0xc0); LcdWriteData(36); LcdWriteData(':'); while(1) { if(K2==0) { Delay10ms(1); if(K2==0) { while(K2==0); sensor=!sensor; } } if(sensor==0) { danjia=1.5; LcdWriteCom(0x80+13); LcdWriteData('0'+(int)danjia%10); LcdWriteData('.'); LcdWriteData('0'+(int)(danjia*10)%10); LCDWrite_String(11, 1," Day"); } else { danjia=2.0; LcdWriteCom(0x80+13); LcdWriteData('0'+(int)danjia%10); LcdWriteData('.'); LcdWriteData('0'+(int)(danjia*10)%10); LCDWrite_String(11, 1,"Night"); } jisuan(); if(K3==0) //启动 { while(K3==0); keren_state=1; distance=0; min=0; sec=0; Time=0; } if(K4==0) { while(K4==0); keren_state=0; } } } //定时器0和外部中断0的初始化 void init() { EA=1; EX0=1;//打开INT0的中断允许。 IT0=1;//跳变沿出发方式（下降沿） TMOD = 0x11; //选择工作方式1 TH0 = 0x3c; TL0 = 0xb0; ET0=1;//开启定时器0中断 TR0=1;//开启定时器0 } void Int0() interrupt 0 //外部中断0的中断函数 { if(keren_state==1) { distance=distance+0.3; } Time=0; } void timer0() interrupt 1 { TH0 = 0x3c; TL0 = 0xb0; if(keren_state==1) Time++; if(Time>=20) { Time=0; sec++; if(sec>=60) { sec=0; min=min+1; } } } void jisuan() { if(min>5) { wait=(danjia/2)*(min-5); } else { wait=0; } zongjia=danjia*distance+wait; //显示路程 LcdWriteCom(0x80+2); LcdWriteData('0'+(long int)(distance/1000)%10); LcdWriteData('0'+(long int)(distance/100)%10); LcdWriteData('0'+(long int)(distance/10)%10); LcdWriteData('0'+(long int)distance%10); LcdWriteData('.'); LcdWriteData('0'+(long int)(distance*10)%10); LcdWriteData('K'); LcdWriteData('m'); //显示总价钱 LcdWriteCom(0xc0+2); //定位显示位置为第二行第一位 LcdWriteData('0'+(int)(zongjia/100)%10); //显示速度百位 LcdWriteData('0'+(int)(zongjia/10)%10); //显示速度十位 LcdWriteData('0'+(int)zongjia%10); //显示速度个位 LcdWriteData('.'); LcdWriteData('0'+(long int)(zongjia*10.0)%10); //显示小数点后一位 } void LCDWrite_String(uchar x, uchar y, uchar *s) //x 0~15 , y 0,1 { LCD_set_xy(x,y); while(*s) { LcdWriteData(*s); s++; } } void LCD_set_xy(uchar x,uchar y) { if(y==0) { LcdWriteCom(0x80+x); } if(y==1) { LcdWriteCom(0xc0+x); } } void Lcd1602_Delay1ms(uint16 i) { while(i--); } void LcdWriteCom(uint8 c) //写命令 { Lcd1602_Delay1ms(1000); rs=0; rw=0; e=0; P0=c; e=1; Lcd1602_Delay1ms(10); e=0; } void LcdWriteData(uint8 dat) //写数据 { Lcd1602_Delay1ms(1000); rs=1; rw=0; e=0; P0=dat; e=1; Lcd1602_Delay1ms(10); e=0; rs=0; } void LcdInit() { Lcd1602_Delay1ms(1000); LcdWriteCom(0x38); LcdWriteCom(0x38); LcdWriteCom(0x38); LcdWriteCom(0x06); LcdWriteCom(0x0c); LcdWriteCom(0x01); }