pwm_motor.c

这个是PWM电机的,这种程序网上多死,就不差我一个了,嘎嘎~

  /*用PWM控制电机脉冲频率应控制在25HZ～35HZ之间*/
  /*定时1ms,1个周期30ms,脉冲频率为33HZ		   */
#include   <reg52.h>
  sbit   INT_1=P1^0;
  sbit   INT_2=P1^1;
  sbit   INT_3=P1^2;
  sbit   INT_4=P1^3;
  sbit   EN1=P1^4;

  unsigned char    time=0;
  unsigned char    period=30;
  unsigned char    high=10;
  unsigned char    th0=0;
  unsigned char    tl0=1;
  bit    dir;


void dealy(unsigned char num)
{
unsigned char i;
for(i=0;i<100*num;i++);

}



void   timer0()   interrupt   1   using   1
{
          TH0=0xfc;     /*定时器初值重装载64536*/
          TL0=0x18;
          time++;
          if(dir==1)
	{
		if(time==high)
		{
			INT_1=1;
			INT_2=0;
		}
		else if(time==period)
		{
			time=1;
			INT_1=1;
			INT_2=0;
		}
   	}
	else
	{
		if(time==high)
		{
			INT_1=0;
			INT_2=1;
		}

		else if(time==period)
		{
			time=0;
			INT_1=0;
			INT_2=1;
           }
       }
}



void   main()
{
	P0=0x00;
	P2=0x00;

	TMOD=0x01;   /*定时器0方式1*/
	TH0=0xfc;     /*定时器装载初值，设置脉冲信号的占空比为1／5*/
	TL0=0x18;

	ET0=1;   /*开定时器0中断*/
	TR0=1;    /*启动定时器0*/
        EA=1;     //开CPU中断
        dir=1;
	while(1)
	{
		;
	}
}