[嵌入式]蓝桥杯超声波

//蓝桥杯GXCT板子
#include "STC15F2K60S2.h"
#include "intrins.h"
sbit beep = P0^6;
sbit a = P2^5;
sbit b = P2^6;
sbit c = P2^7;
sbit trig = P1^0;
sbit echo = P1^1;
#define  Y7C       {a = b = c = 1;}		     //dula
#define  Y6C       {a = 0;b = c = 1;}        //wela
#define  Y5C       {a = c = 1;b = 0;}
#define somenop()  {_nop_();_nop_();_nop_();_nop_();_nop_();_nop_();_nop_();_nop_();_nop_();_nop_();}
unsigned char code table[]={0xc0,0xf9,0xa4,0xb0,0x99,
										        0x92,0x82,0xf8,0x80,0x90};
unsigned char code position[]={0x01,0x02,0x04};
unsigned char buf[] ={1,2,3};										//Receive  Data
unsigned char  site = 0;	
void delayus(unsigned int x)
{
	 for(x=12*x;x>0;--x)
	{
		 _nop_(); _nop_(); _nop_(); _nop_();
	}
}
void delayms(unsigned int x)
{
	 unsigned char i,j;
	for(;x>0;--x)
	{
		i = 12; j = 169;
		while(i--)
		{
			 while(j--);
		}
	}
}

void sendWave(void)
{
	unsigned char i = 4;
	while(i--)
{
		trig = 1;
	    somenop();somenop();somenop();somenop();
	    trig = 0;
		somenop();somenop();somenop();somenop();
 }
}

void display(void)
{
	P0 = 0X00;
	Y7C;										//dula
	P0 = table[buf[site]];
    delayus(1);
	Y6C;										//wela
	P0 = position[site];		//无关数据处理
}

void Seginit(void)				//T1用作数码管扫描
{
	AUXR = 0X3f;		         //8051
	TMOD = 0X10;		         //16位
	EA = ET1 = TR1 = 1;
	TH1 = (65536 - 4608)/256;
	TL1 = (65536 - 4608)%256;
}

void HC_init(void)				//T0用作HC_SR04
{
	TMOD |= 0X01;		//16位
	EA = ET1 = 1;
	TR0 = 0;
	TH0 = TL0 = 0;
	TF0 = 0;
}

unsigned char flag = 1,count = 0;

main()
{
	unsigned int number,distance;
	float time;
	Y5C;      beep = 0;			
    Seginit();
	HC_init();
	while(1)
{
	if(flag==1)			//每200ms测量一次
	{
		sendWave();
	  TR0 = 1; TF0 = 0;
		while((echo==1) & (TF0==0));		//等待高电平的到来
		TR0 = 0;
		if(TF0==1)
		{
				buf[0] = buf[1] = buf[2] = 9;
			  TF0 = 0;
		}
		else
	{
		number = (TH0 << 8) | TL0;
		TH0 = TL0 = 0;
		time = number*1.085;
		distance = (unsigned int)(time*0.17);  //340m/s == 340m/1000ms
		buf[0] = distance/1000;
		buf[1] = distance/100%10;
		buf[2] = distance%10;
		}
	}		
	  flag = 0;
	}
}
void T1(void) interrupt 3
{
	TH1 = (65536 - 4608)/256;		 //5ms
	TL1 = (65536 - 4608)%256;    //5ms
	display();
	if(++site==3)
		site = 0;
	if(++count==40)		//40*5 = 200ms
	{
		 count = 0;
		 flag = 1;
	}
}
void T0(void) interrupt 1			//T0用作HC_SR04
{
			TH0 = TL0 = 0;
			TF0 = 0;
}