基于C51单片机、CX20106芯片和1602液晶LCD的超声波测距程序

#include <reg51.h> #include<INTRINS.H> #include "1602.h" sbit EN=P1^0; uchar Key_Value=0xff; void Int_init(void); void Distance(void); uchar Change_ASC(uchar temp); void Key_Scan(void); void delay10us(void); uint sync_trans=0; uint sync_rec=0; uint sync=0; bit trans_ed=0; bit rec_ed=0; uint overtime=0; uint temp=0; float result=0; bit error=0; void main() { EN=1; InitLcd(); Int_init(); while(1) { if(trans_ed==0&&sync_trans==sync&&error==0) { TH0=TL0=0x00; EA=1; EX1=1; sync_trans++; trans_ed=1; overtime=0; EN=0; TR0=1; _nop_();_nop_();_nop_();_nop_();_nop_(); _nop_(); _nop_(); EN=1; rec_ed=0; } else { EX1=0;TR0=0;error=1; } while(trans_ed==1&&rec_ed==0&&sync_rec==sync&&overtime<=30000&&error==0) {overtime++;} if(trans_ed==1&&rec_ed==1&&sync_rec==sync&&overtime<30000&&error==0) { EX1=0;overtime=0; sync_rec++; temp=TH0*256+TL0; result=temp*(0.0344/2)*(12/11.0592); temp=(uint)result; DisplayOneChar(0,0,Change_ASC((temp/100)%10)); DisplayOneChar(1,0,Change_ASC((temp/10)%10)); DisplayOneChar(2,0,Change_ASC(temp%10)); DisplayOneChar(3,0,'.'); DisplayOneChar(4,0,Change_ASC((uchar)(result*10)%10)); DisplayOneChar(5,0,Change_ASC((uchar)(result*100)%10)); DisplayOneChar(6,0,'C'); DisplayOneChar(7,0,'M'); DisplayOneChar(8,0,' '); sync++; overtime=0; trans_ed=0; rec_ed=0; } else if(overtime>=30000) { EX1=0;TR0=0; DisplayListChar(0,0,"OVER TIME "); error=1; } else{EX1=0;TR0=0;error=1;} if(sync!=sync_trans||sync!=sync_rec||error==1) { TR0=0;EX1=0; rec_ed=0;trans_ed=0; sync=sync_trans=sync_rec=0; error=0;overtime=0; delay(200); } if(sync>=60000){sync=sync_trans=sync_rec=0;} delay(200); } } void Int_init(void) //外部1，定时0计数 { TH0=0; TL0=0; TMOD=0x11; } uchar Change_ASC(uchar temp) { uchar result; if(temp>9) result=temp+0x37; else result=temp+0x30; return result; } void Int2(void) interrupt 2 { TR0=0; EX1=0; rec_ed=1; } void delay10us(void) { uchar i=0; for(i=0;i<2;i++); }