/* Example program to test beacon receiver.
   Configured for internal receiver.  */

// first tell compiler to use beacon software
#use beacons.icb         
// note - cannot put comment on #use or # define
// define which beacon receiver to use: 1 internal, 2 external
#define BCNREC 1

void main()   
{
    int bcn;         // define variable for beacon result
    beacon_init(BCNREC);   // turn on beacon receiver
    
    while( !stop_button() )   // repeat until stop button pressed
      {
        bcn = checkbeacon(BCNREC);   // get beacon value using function
        printf("Beacon: %d\n", bcn);  // print message
        if( bcn == 12 )      // double beep for 12 ms beacon
          {           
            beep();
            sleep(0.1);
            beep();
        }
        else if (bcn ==5)   //single beep for 5 ms beacon
          {
            beep();
            sleep(0.3);
        }
        sleep(0.4); // delay a bit anyway so display doesn't flicker
    } // end of while
    
    beacon_init(0);   // turn off all receivers
    printf("Stopped, Goodbye\n");  // print message
} // end of main function

/* Function to check beacon time, return 5 or 12 for beacon time or 0 if no valid signal.
   Pass argument 1 for internal receiver or 2 for external receiver.
   Main function must enable appropriate receiver first!   */
int checkbeacon(int beaconReceiver)
{
    int btime = beacon(beaconReceiver);  // create variable and get beacon time
    if((btime > 11000) && (btime < 13000)) return 12;  //is it about 12 ms?
    else if((btime > 4000) && (btime < 6000)) return 5;  // is it about 5 ms?
    else return 0;   // if neither, return 0
} // end of checkbeacon function