LED fade not working in program

hello guys,

i'm trying implement fade in-out function led

code: [select]

int value;
int ledpin = 9;                           // light connected digital pin 10
long time=0;

void setup()
{
 // nothing setup
}

void loop()
{
 value = 128+127*cos(2*pi/10000*millis());
 analogwrite(ledpin, value);           // sets value (range 0 255)
}
when runs how is, works great, when implement code program, dont works @ all.
i've tryied put code while it's didn't worked out.

my program looks this:

code: [select]



int value;
int ledpin = 9;                           // light connected digital pin 10
long time=0;
int periode = 10000;

void setup()

{
 // setting stuff
}
    void loop()
{
    if (true)
    {
      if(buf[0]=='2')
      {
        {
          value = 128+127*cos(2*pi/10000*millis());
          analogwrite(ledpin, value);           // sets value (range 0 255)
      } 
      if(buf[0]=='3')
      {
        digitalwrite(9, low);
      }
}  else  {
        digitalwrite(12, high);
        }
}

i spended on several hours no result. gladly appreciated! thank you! 

code: [select]

if (true)
why bother testing?

code: [select]

if(buf[0]=='2')
where buf  defined?

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