51单片机直流电机调速程序 -

标题: 51单片机直流电机调速程序 [打印本页]

作者: 51黑plc 时间: 2016-3-10 20:21
标题: 51单片机直流电机调速程序
#include<reg52.h>
sbit KEY1 = P3^1; //定义调速按键
sbit PWM = P1^5; //定义调速端口
unsigned char CYCLE; //定义周期T=x*0.1ms
unsigned char PWM_ON ; //定义高电平时间
void delay(unsigned int cnt)
{
      while(--cnt);
}
main()
{
      unsigned char PWM_Num;
      TMOD |=0x01;
      TH0=(65536-1000)/256;
      TL0=(65536-1000)%256;
      IE= 0x82;
      TR0=1;
      CYCLE = 10;
      while(1)
      {
            if(!KEY1)
            {
                     delay(10000);
                     if(!KEY1)
                     {
                              PWM_Num++;
                              if(PWM_Num==4)
                                    PWM_Num=0;
                              switch(PWM_Num)
                              {
                                    case 0:P0=0x06;PWM_ON=0;break;
                                    case 1:P0=0x5B;PWM_ON=4;break;
                                    case 2:P0=0x4F;PWM_ON=6;break;
                                    case 3:P0=0x66;PWM_ON=8;break;
                                    default:break;
                              }
                     }
            }
      }
}
void tim(void) interrupt 1 using 1
{
      static unsigned char count;
      TH0=(65536-1000)/256;
      TL0=(65536-1000)%256;
      if (count==PWM_ON)
      {
            PWM = 1;
      }
      count++;
      if(count == CYCLE)
      {
            count=0;
            if(PWM_ON!=0)
                     PWM = 0;
      }
}

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