PIC18f2450 als een Human Interface Device

#include <18f2450.h>
//#define __USB_PIC_PERIF__ 1    //Only for PIC18f4550 

#fuses HSPLL
#fuses NOWDT
#fuses NOPROTECT
#fuses NOLVP
#FUSES NOXINST                  //Extended set extension and Indexed Addressing mode disabled (Legacy mode) 
#fuses NODEBUG    // if this isn't there - things don't work !!!
#fuses USBDIV
#fuses PLL5 // 20 MHz crystal
#fuses CPUDIV1 // to support slow speed 6 mhz
#fuses VREGEN
#fuses NOPBADEN
//#build(reset=0x1, interrupt=0x8)          // Necessary for Bootloader 
#use delay(clock=48000000) 
#use rs232(baud=9600, xmit=PIN_C6, rcv=PIN_C7)

#use fast_io(a)
#use fast_io(b)
#use fast_io(c)

/*
//Tells the CCS PIC USB firmware to include HID handling code. 
#define USB_HID_DEVICE  TRUE              //Previously it was "DEFINE"

//the following defines needed for the CCS USB PIC driver to enable the TX endpoint 1   
// and allocate buffer space on the peripheral   
#define USB_EP1_TX_ENABLE  USB_ENABLE_INTERRUPT   //turn on EP1 for IN bulk/interrupt transfers   
#define USB_EP1_TX_SIZE    64                      //allocate 8 bytes in the hardware for transmission   
   
//the following defines needed for the CCS USB PIC driver to enable the RX endpoint 1   
// and allocate buffer space on the peripheral   
#define USB_EP1_RX_ENABLE  USB_ENABLE_INTERRUPT   //turn on EP1 for OUT bulk/interrupt transfers   
#define USB_EP1_RX_SIZE    64    //allocate 8 bytes in the hardware for reception   
*/
//void knipper(void);
void usb_debug_task(void);

#include <usb_desc_hid.h>
#include <pic18_usb2.h>
#include <usb.c>
#include <usb.h>

int a = 0;

/////////////////////////////////////////////////////////////////////////////
//
// usb_debug_task()
//
// When called periodically, displays debugging information over serial
// to display enumeration and connection states.  Also lights LED1 based upon
// enumeration and status.
//
/////////////////////////////////////////////////////////////////////////////
void usb_debug_task(void)
{
   static int8 last_connected;
   static int8 last_enumerated;
   int8 new_connected;
   int8 new_enumerated;

   new_connected=usb_attached();
   new_enumerated=usb_enumerated();

   if (new_connected && !last_connected)
      printf("\r\n\nUSB connected, waiting for enumaration...");
   if (!new_connected && last_connected)
      printf("\r\n\nUSB disconnected, waiting for connection...");
   if (new_enumerated && !last_enumerated)
      printf("\r\n\nUSB enumerated by PC/HOST");
   if (!new_enumerated && last_enumerated)
      printf("\r\n\nUSB unenumerated by PC/HOST, waiting for enumeration...");

   last_connected=new_connected;
   last_enumerated=new_enumerated;
}

void main(void)
{
  	SET_TRIS_A( 0x00 );
    SET_TRIS_B( 0x00 );
    output_high(PIN_B0);
    output_a(0);
    setup_timer_0(RTCC_INTERNAL);
    setup_timer_1(T1_EXTERNAL|T1_DIV_BY_1|T1_CLK_OUT); 
    //enable_interrupts(GLOBAL);
    enable_interrupts(INT_TIMER1);
    //enable_interrupts(INT_USB);
    set_timer1(0);

	#ifdef __PCH__
   		printf("\r\nPCH: v");
   		printf(__PCH__);
  	#else
   		printf("\r\n\PCM: v");
  		printf(__PCM__);
  	#endif

   	usb_init_cs();
	
  	//usb_wait_for_enumeration();      //wacht op herkenning door de host PC 
  	
   	while(1)
   	{
	   	usb_task();                      
   		usb_debug_task();
      	if (usb_enumerated()) 
	  	{
         	output_b(0);	
      	}   
   }
}

#INT_TIMER1
void knipper()
{
   clear_interrupt(int_timer1);
   if (a == 0)
      {
         a=1;
         output_high(PIN_A0);
      }
      else
      {
         a=0;
         output_low(PIN_A0);
      }