' Name        : LOOKDOWN.pbp
' Compiler    : PICBASIC PRO Compiler 2.6
' Assembler   : PM or MPASM
' Target PIC  : 12F, 16F or 18F
' Hardware    : PC serial connection & terminal for input/output
' Oscillator  : 4MHz internal or external
' Keywords    : LOOKDOWN, SERIN, SEROUT
' Description : PICBASIC PRO program to demonstrate the LOOKDOWN Command.
' Converts ASCII Hexadecimal characters to numeric equivalents.
'

Include "modedefs.bas" ' Include serial modes

SO Con 0               ' Define serial out pin
SI Con 1               ' Define serial in pin
B0 Var byte
B1 Var byte

mainloop:
   Serin SI,N2400,B0               ' B0 = Next Character
   B1 = 255			   ' B1 = Convert to Hex (255 if Fail)
   Lookdown B0,["0123456789ABCDEF"],B1

   If B1 = 255 Then mainloop       ' Skip Non-Hex Characters
   Serout SO,N2400,[#B1,13,10]     ' Output Decimal Equivalent
   
   Goto mainloop                   ' Forever

   End