控制直流電極的程序用L298n為啥電機沒動

ID:146960 · 發(fā)表于 2016-12-9 18:47

上面的程序中有sbit NUM_1=P2^4;這個，是打開第一位數碼管，沒用到位選，這也可以嗎？還有這個我用L298n為啥電機沒動了？

#include <reg52.h>
#include <intrins.h>
#define uchar unsigned char
#define uint  unsigned int
sbit L1=P1^0;
sbit L2=P1^1;
sbit R1=P1^2;
sbit R2=P1^3;
sbit key_down=P3^4;
sbit key_set=P3^5;
sbit key_up=P3^6;
sbit NUM_1=P2^4;
uchar PWM;
uchar num=0,duty=0,speed=0;
uchar code table[]={

            0x3F,  //"0"
            0x06,  //"1"
            0x5B,  //"2"
            0x4F,  //"3"
            0x66,  //"4"
            0x6D,  //"5"
            0x7D,  //"6"
            0x07,  //"7"
            0x7F,  //"8"
            0x6F,  //"9"
            0x77,  //"A"
            0x7C,  //"B"
            0x39,  //"C"
            0x5E,  //"D"
            0x79,  //"E"
            0x71,  //"F"
            0x76,  //"H"
            0x38,  //"L"
            0x37,  //"n"
            0x3E,  //"u"
            0x73,  //"P"
            0x5C,  //"o"
            0x40,  //"-"
            0x00,  //熄滅
            0x00  //自定義

                     };

void delay(uchar i)
{
uchar j,k;
for(j=i;j>0;j--)
for(k=125;k>0;k--);
}
void car_forward(uchar speed)
{ duty=speed;
  L1=0;
  L2=PWM;
  R1=0;
  R2=PWM;
}
void car_stop(void)
{ L1=0;
  L2=0;
  R1=0;
  R2=0;
}
void main(void)
{  TMOD=0x02;
EA=1;
TH0=0XC3;
TL0=0XC3;
ET0=1;
TR0=1;
NUM_1=0;
P0=table[speed];
while(1)
{ if(key_down==0 || key_up==0)
   {ET0=0;
      car_stop();
      delay(10);
      if(key_up==0)
         {
            speed++;
         }
      else if(key_down==0)
         { if(speed != 0)
            {
         speed--       ;
      }
         }
      P0=table[speed];
      while(key_down==0 || key_up==0)
         { ET0=1;
         if(key_set==0)
            { ET0=0;
               car_stop();
      speed=0;
      P0=table[speed];
            }
         }
   }
}
}
void timer0(void) interrupt 1
{ num++;
  if(num <= duty)
{
   PWM=1;
}
  else
  {
PWM=0;
  }
  if(num >= 10)
  {
num=0;
  }
  car_forward(speed);
}