' Name        : UPPERX18.pbp
' Compiler    : PICBASIC PRO Compiler 2.6
' Assembler   : PM or MPASM
' Target PIC  : PIC16F88 or similar
' Hardware    : LAB-X18 Experimenter Board
' Oscillator  : 4MHz external crystal
' Keywords    : SERIN, SEROUT
' Description : PICBASIC PRO test program for upper case serial filter.
'

Include "modedefs.bas"  ' Include serial modes

SI Var PORTB.2           ' Define serial in pin
SO Var PORTB.5           ' Define serial out pin
B0 Var Byte

loops:
   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 loops             ' Forever

   End