pls help PWM fan

[Chan]

i want to use two button to control the fan speed  (fast and slow)

 

this is the code

 

 

#include <reg52.h>

unsigned char timer1;

int time;

sbit PWM=P1^2;

void system_Ini()

{

    TMOD = 0x10;

    TH1 = 0xfe;

    TL1 = 0x33;

    TR1 = 1;

    IE = 0x8A; 

}

/**************************************************

Function: delay_us();

 

/**************************************************/

void delay_us(unsigned int x)

{

    unsigned int i=0;

    for(i=0;i<x;i++)

    {;}

}

 main()

{ time=50;

  system_Ini();

  while(1)

  {

    P2|=0xff;

    if(P2==0xfe&&time<100)

      {delay_us(1200);

      if(P2==0xfe)

      time+=1;}

    if(P2==0xfd&&time>0)

      {delay_us(1200);

      if(P2==0xfd)

      time-=1;}

    if(timer1>100)

    timer1=0;

    if(timer1<time)

    PWM=0;

    else

    PWM=1;

  }

}

/*************************************

 

*************************************/

void T1zd(void) interrupt 3    

{

    TH1 = 0xfe; //11.0592

    TL1 = 0x33;

     timer1++;

}

 

 i use the software to test 

 

 

 

 

it shows the code is work?

 

but will test in hardware

 

all the thing is not work!! 

 

 

 I don’t know where is the problem can anyone help pls

[Author]

Posts