at89c2051制作的超声波测距源程序

#define k1 P3_4
#define csbout    P3_5                  //超声波发送
#define csbint    P3_7                  //超声波接收
#define csbc=0.034
#define bg  P3_3
unsigned char csbds,opto,digit,buffer[3],xm1,xm2,xm0,key,jpjs;//显示标识
unsigned char convert[10]={0x3F,0x06,0x5b,0x4f,0x66,0x6d,0x7d,0x07,0x7f,0x6f};//0~9段码
unsigned int s,t,i, xx,j,sj1,sj2,sj3,mqs,sx1;
bit cl;     
                            
void csbcj();
void delay(j);                              //延时函数
void scanLED();                              //显示函数
void timeToBuffer();                  //显示转换函数
void keyscan();
void k1cl();
void k2cl();