#include <reg52.h>
#define uchar unsigned char
#define uint unsigned int
sbit ENA=P0^1;
sbit ENB=P0^2;
sbit out1 = P1^1 ; //P2.0到P2.3是电机驱动输出控制端
sbit out2 = P1^2 ;
sbit out3 = P1^4 ;
sbit out4 = P1^5 ;
sbit Trig = P0^4; //产生脉冲引脚
sbit Echo = P0^5; //回波引脚
sbit PWM=P0^3; //舵机pwm//
uint distance[4]; //测距接收缓冲区
uint distance1;
uchar ge,shi,bai,temp,flag,outcomeH,outcomeL,PDATA; //自定义寄存器
bit succeed_flag; //测量成功标志
unsigned long xdata rec_code;
unsigned long xdata time_us;
unsigned char xdata rec_cnt;
unsigned char xdata kbuf;
//uchar sdata,flag; //sdata是红外遥控接收键值变量 flag是启动小车 或停止小车变量
uint j,a;
uchar pro;
bit rec_b;
bit key_save;
bit keyp;
void chaoshengbo();
void conversion(uint temp_data);
void delay_20us();
void delay_ms(uint x);
void delay(uint t) //延时程序1
{
uchar j;
while(t--)
{
for(j=5;j>0;j--);
}
}
void Init() //初始化
{
// flag=0;
Trig=0;
TMOD = 0x11;//T/C1采用16位定时器/计数器
ET1 = 1;//定时器1开中断
ET0 = 1;
TH0 = 0x00;
TL0 = 0x00;
TH1 = 0xff;
TL1 = 0xce;
TR1=0;
TR0= 0;//定时计数器启动计数
EX0 = 1;//外部中断0关中断
PT1 = 1;
EA = 1;//CPU开中断
}
//--------------------------------------------------
//-------超声波测距----------------------------
void chaoshengbo()
{
uint distance_data;
EA=0;
Trig=1;
delay_20us();
Trig=0; //产生一个20us的脉冲，在Trig引脚
while(Echo==0); //等待Echo回波引脚变高电平
succeed_flag=0; //清测量成功标志
TH0=0; //定时器1清零
TL0=0; //定时器1清零
EX0=1; //打开外部中断
TR0=1; //启动定时器1
EA=1;
delay_ms(1);
// if(succeed_flag==1)
// {
distance_data=outcomeH; //测量结果的高8位
distance_data<<=8; //放入16位的高8位
distance_data=distance_data|outcomeL;//与低8位合并成为16位结果数据
distance_data=(distance_data/25)*43/100;
// }
a=distance_data;
distance1=a;
}
void delay_us(uint x)
{
do
{
x--;
}
while(x>1);
}
void delay_ms(uint x)
{
while(x!=0)
{
delay_us(500);
x--;
}
}
baidong()
{
TR1=1;
pro=24;
delay_ms(100);
pro=10;
delay_ms(100);
pro=36;
delay_ms(100);
pro=24;//90°
delay_ms(100);
TR1=0;
}
void timer0() interrupt 3//定时0.1ms
{
TH1=0xff;
TL1=0xce;
j++;
if(j<=pro)
{
PWM=1;
}
else
{
PWM=0;
}
if(j==400) //周期20ms
{
j=0;
PWM=~PWM;
}
}
//左转
void comeleft()
{
out1=0;
out2=1;
out3=1;
out4=0;
delay_ms(40);
}
//右转
void comeright ()
{
out1=1;
out2=0;
out3=0;
out4=1;
delay_ms(40);
}
//前进加速；
void comeon()
{
out2=0;
out4=0;
out1=1;
out3=1;
}
//后退；
void back()
{
out2=1;
out4=1;
out1=0;
out3=0;
delay_ms(200);
}
void stop() //停止
{
out1=0;
out2=0;
out3=0;
out4=0;
}
//避障原路返回
void shunback()
{
uint DATA1,DATA2;
chaoshengbo();
if(distance1<8)
{
stop();
TR1=1;
pro=10;//0°
delay_ms(50);
TR1=0;
PWM=1;
chaoshengbo();
DATA1= distance1;
distance1=0;
TR1=1;
pro=36;//180°
delay_ms(50);
TR1=0;
PWM=1;
chaoshengbo();
DATA2= distance1;
distance1=0;
TR1=1;
pro=24;//180°
delay_ms(50);
TR1=0;
if(DATA1>=8 && DATA1>DATA2)
{
comeright ();comeon();
}
else if (DATA2>=8 && DATA2>=DATA1)
{
comeleft(); comeon();
}
else if (DATA2<8 && DATA1<8)
{
back(); comeleft();comeon(); }
}
else
{
comeon();
}
}
void main(void)
{
P1=0XFF;
P2=0XFF;
P3=0XFF;
P0=0XFF;
Init();
baidong();
while(1)
{
shunback();
}
}
//***************************************************************
//外部中断0，用做判断回波电平
INTO_() interrupt 0 // 外部中断是0号
{
outcomeH =TH0; //取出定时器的值
outcomeL =TL0; //取出定时器的值
succeed_flag=1; //至成功测量的标志
EX0=0; //关闭外部中断
TR0=0;
}
//****************************************************************
//******************************************************************
void delay_20us()
{
uchar bt ;
for(bt=0;bt<100;bt++);
}
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