//*******************************************************************************
// 
//   Simple program to decode commands of RC5 infrared remote controls                                                         
//                                     
//                                                            
//   ATTENTION! All timer-values just fit, if the controller runs with 20 MHz!!!
//   When you use another frequency, the values have to be adapted!
//
//*******************************************************************************

int1 get_RC5(void);


typedef struct
{
int8 data[2];
int8 state;
} rc5_struct;
rc5_struct rc5;


int1 get_RC5(void)
{
   int16 tmp,t;
   int i;
   int1 inp;

   set_timer1(0);
   while(IR_STATUS==1);
   t=get_timer1();

   if ((t<400) || (t>800)) return 0;   // no RC5 code, abort decoding

   for (i=0;i<13;i++)
   {
      inp=IR_STATUS;
      set_timer1(0);

      while (IR_STATUS==inp)
      {
         t=get_timer1();
         if (t>800) return 0;   // no RC5 code, abort decoding
      }

      tmp<<=1;

      if (inp==0) tmp++;

      set_timer1(0);
      while (get_timer1()<776);  // a simple delay would work here as well
   }

   tmp=tmp | 0x3000;
   tmp=tmp & 0x37ff; // cut off togglebit

   rc5.data[0]=tmp & 0xff;  // device address
   tmp>>=8;
   rc5.data[1]=tmp & 0xff;  // command code

   rc5.state = 1;

   disable_interrupts(INT_EXT);

   return 1;
}