51单片机超声波测距.doc

基于AT89S52超声波测距（绝对能用哦）3.4原理图：4 系统程序的设计：超声波测距器的软件设计主要有主程序、超声波发生子程序、超声波接收中断程序即显示子程序组成。/超声波测距#include#include intrins.h#define uchar unsigned char/宏定义#define uint unsigned int/宏定义sbit SEND=P22;sbit P2_3=P23;unsigned int count=0;sbit RS=P35;/定义I/O的硬件接口sbit RW=P36;sbit E=P34;uint c=17000,a,b,c,d;long int s;uchar temp;#define DPDR P1/并行数据接口定义uchar code DispTab_1=0,1,2,3,4,5,6,7,8,9;/1602：0-9 数字uchar code DispTab_2=A,B,C,D,E,a,b,c,d,e;/1602：A-e 字母uchar DispBuf4; char char_char_1=chaoshengbo ceju;char char_char_2=distance:;char char_char_3=mm;void delay(uint z) uchar x,x1;for(;z0;z-)for(x=0;x114;x+)for(x1=0;x11;x1+);void write_Directive(uchar a)RS=0;RW=0;delay(1);E=0;DPDR=a;delay(1);E=1;delay(1);E=0;delay(1);void write_Data(uchar a)RS=1;RW=0;delay(1);E=0;DPDR=a;delay(1);E=1;delay(1);E=0;delay(1);void init()/初始化 uchar i;delay(15);write_Directive(0x38);delay(5);write_Directive(0x38);delay(5);write_Directive(0x38);write_Directive(0x01);write_Directive(0x02);write_Directive(0x0c);write_Directive(0x80+0x40);for(i=0;i16;i+)write_Data(char_char_1i);write_Directive(0x80+0x00);for(i=0;i9;i+)write_Data(char_char_2i);write_Directive(0x80+0x0d);for(i=0;i2;i+)write_Data(char_char_3i);void write_Data_String() write_Directive(0x80+0x09);write_Data(DispBuf0);write_Data(DispBuf1);write_Data(DispBuf2);write_Data(DispBuf3);void main(void)init();P2_3=1;TMOD=0x11;TH0=0xff; TL0=0xf4; TH1=0xff; TL1=0xfe;ET0=1;ET1=1;EX0=1;/允许外部中断0中断IT0=1;/外部中断0跳变触发EA=1;TR0=1;TR1=1;while(1);void time_0() interrupt 1TH0=0xff; TL0=0xf4;SEND=SEND;void re(void) interrupt 0TR0=0;TR1=0;P2_3=0;s=33000*count;a=s/10000000;b=s%10000000/1000000;c=s%1000000/100000;d=s%100000/10000;DispBuf0=a;DispBuf1=b ;DispBuf2=c;DispBuf3=d;temp=DispBuf0;DispBuf0=DispTab_1temp;temp=DispBuf1;DispBuf1=DispTab_1temp;temp=DispBuf2;DispBuf2=DispTab_1temp;temp=DispBuf3;DispBuf3=Disp