HSV Farbraum

//Rot OK

hsv_to_rgb (0,1,1);

//Grün OK

hsv_to_rgb (120,1,1);

//Weiß bleibt dunkel

hsv_to_rgb (0,0,1);

void hsv_to_rgb (float h,float s,float v)

{

 float r,g,b;      

 int i;

 float f, p, q, t;

 if( s == 0 ) 

   {

  r = g = b = v;

  return;

  }

 h /= 60;        // sector 0 to 5

 i = floor( h );

 f = h - i;      

 p = v * ( 1 - s );

 q = v * ( 1 - s * f );

 t = v * ( 1 - s * ( 1 - f ) );

 switch( i )

      {

    case 0:

      r = v; g = t; b = p; break;

    case 1:

      r = q; g = v; b = p; break;

    case 2:

      r = p; g = v; b = t; break;

    case 3:

      r = p; g = q; b = v; break;      

    case 4:

      r = t; g = p; b = v; break;

    default:                

      r = v; g = p; b = q; break;        // case 5:          

    }

 int rc=r*255;   // Auf 8 Bit RGB skalieren, nacher nur noch kopieren

 int gc=g*255;

 int bc=b*255;    

  OCR1AL=rc;

  OCR1BL=gc;

  OCR2=bc;

}