51单片机L298N电机驱动模块调速代码

#include <reg52.h>
//定义输出端口
sbit INT=P1^0;
sbit INT2=P1^1;
sbit INT3=P1^2;
sbit INT4=P1^3;
sbit EN1 = P1^4;
sbit EN2 = P1^5;

typedef unsigned int u16;
typedef unsigned char u8;

    u8  buf;        //串口数据缓冲
    
    u8 speed=100;    //设置初始速度
    
    u8 pwm;            //设置比较参数
 
//向前走
void CarGo()
{

  speed = 50;
      INT= 1;
      INT2=0;
      INT3=1;
      INT4=0;
}
//向后走
void CarBack()
{
  speed = 40;
     INT= 0;
     INT2=1;
     INT3=0;
     INT4=1;

  
}
//小车左转
void CarTurnLeft()
{
    speed = 35;
      INT=0;
      INT2=0;
      INT3=1;
      INT4=0;
  
}
//小车右转
void CarTurnRight()
{
   speed = 35;
      INT= 1;
      INT2=0;
      INT3=0;
      INT4=0;

}



//小车停止
void CarStop()
{

      INT= 0;
      INT2=0;
      INT3=0;
      INT4=0;
  speed = 0;
}


//小车加速
void speedup()
{
      INT= 1;
      INT2=0;
      INT3=1;
      INT4=0;
  speed+=4;
  if(speed>=100)
  {
      speed = 100;
  }
 

}



//小车减速
void speeddown()
{
      INT= 1;
      INT2=0;
      INT3=1;
      INT4=0;
  speed-=5;
  if(speed<=18)
  {
      speed = 18;
  }
  
}



//初始化定时器0，以用于调速
void timer ()
{
    TMOD|=0X01;
    TH0 = (65536-1500)/256;
    TL0 = (65536-1500)%256;      
    TR0 = 1;
    ET0 = 1;
    EA =1;
}
//定时器1中断函数
void init() interrupt 1
{
    TH0 = (65536-100)/256;
    TL0 = (65536-100)%256;
    pwm++;
    
    if(pwm==100)
    {pwm = 0;}
    if(pwm<=speed)
    {
        EN1 = 1;
        EN2 = 1;
    
    }
     if(pwm>speed)
    {
        EN1 = 0;
        EN2 = 0;
        
    }


    
}

//串口初始化
void irinit()
{
     SCON=0x50;        //设定串口工作方式
     PCON=0x00;        //波特率不倍增

     EA=1;            //打开总中断

     TMOD|=0x20;
     ES=1;            //打开串口中断
     TR1=1;
     TH1=0xFD;        //设置波特率为9600；
     TL1=0xFD;
}

void main()
{

  irinit();
  timer ();
   while(1);
  
 
  
}

void serial() interrupt 4  
{
      TL1=0xFD;
     TH1=0xFD;//波特率9600


     buf = SBUF;//从串口缓冲区取得数据

//接收手机传给蓝牙的指令以控制小车
     while(!RI); 
      RI = 0;  
     if(buf=='G')
     {
          CarGo();  
     }
     if(buf=='B')
     {
           CarBack(); 
     }
     if(buf=='S')
     {
          CarStop();  
     }
     if(buf=='C')
     {
      
           CarTurnLeft(); 
     }
     if(buf=='E')
     {
          CarTurnRight();  
     }
    
     if(buf=='1')
     {
        speedup(); 
        
               
     }
     if(buf=='2')
     {
        speeddown(); 
        
               
     }
  }

来源：https://blog.csdn.net/linfengXBB/article/details/116140915

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