' Name        : UPPERX3.pbp
' Compiler    : PICBASIC PRO Compiler 2.6
' Assembler   : PM or MPASM
' Target PIC  : PIC16F627A or similar 18-pin type compatible with LAB-X3 board
' Hardware    : LAB-X3 Experimenter Board
' Oscillator  : 4MHz external crystal
' Keywords    : SERIN, SEROUT
' Description : PICBASIC PRO program for upper case serial filter.
'

 Include "modedefs.bas"   ' Include serial modes

SO Var PORTB.2  ' Define serial out pin
SI Var PORTB.1  ' Define serial in pin
B0 Var Byte

mainloop:
   Serin SI, T2400, B0  ' B0 = input character
   If (B0 < "a") or (B0 > "z") Then print ' If lower case, convert to upper
   B0 = B0 - $20

print:
   Serout SO, T2400, [B0] ' Send character
   Goto mainloop          ' Forever

   End