pwm.c

PWM波程序 可以用来控制电机调速

#include<reg52.h>
#include<stdio.h>
#define uchar unsigned char
#define uint  unsigned int
sbit led=P1^0;
uchar counter=0;
void delay(uint z)
{
	uint t1,y;
	for(t1=z;t1>0;t1--)
		for(y=110;y>0;y--);}
void init()
  {TMOD=0X02;
   TR0=1;
   TH0=0X38;
   TL0=0X38;
   EA=1;}
void main()
   {init();
   counter++;
   delay(10000);
if(counter==25)
   counter=0;
    }
 void timer0() interrupt 1
  {uchar flag;
   flag++;
   if(flag==25)
     {flag=0;
      if(counter!=0)
       {led=0;
}}
if(counter>=flag)
   led=1;
 else led=0;
}