' Name        : USBCDC.pbp
' Compiler    : PICBASIC PRO Compiler 2.6
' Assembler   : MPASM
' Target PIC  : PIC18F4550 or similar type
' Hardware    : LAB-XUSB Experimenter Board
' Oscillator  : 20MHz external
' Keywords    : USBSERVICE, USBINIT, USBIN, USBOUT
' Description : PICBASIC PRO program for PIC18F4550 CDC serial port emulation.
' Compilation of this program requires that specific support files be available
' in the source directory. You may also need to modify the file USBDESC.ASM so
' that the proper descriptor files are included. For detailed information, see
' the file PBP\USB18\USB.TXT.
'

Include	"cdc_desc.bas"	' Include the HID descriptors

buffer Var Byte[16]
cnt    Var Byte
LED    Var PORTB.0

Define OSC 48

   USBInit
   Low LED      ' LED off

' Wait for USB input
idleloop:
   USBService   ' Must service USB regularly
   cnt = 16     ' Specify input buffer size
   USBIn 3, buffer, cnt, idleloop

' Message received
   Toggle LED

   buffer[0] = "H"
   buffer[1] = "e"
   buffer[2] = "l"
   buffer[3] = "l"
   buffer[4] = "o"
   buffer[5] = " "
   buffer[6] = "W"
   buffer[7] = "o"
   buffer[8] = "r"
   buffer[9] = "l"
   buffer[10] = "d"
   buffer[11] = 13
   buffer[12] = 10
   buffer[13] = 0

outloop:
   USBService           ' Must service USB regularly
   USBOut 3, buffer, 14, outloop
   Goto idleloop        ' Wait for next buffer

   End