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

[AJISH ALFRED]

Hi Chan,

Kindly add appropriate comments to your code and post again keeping the proper intendation. You will surely get help, and you must help others to read and understand your logic which is done in your code.

[Author]

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