' Name        : UPPERX20.pbp
' Compiler    : PICBASIC PRO Compiler 2.6
' Assembler   : PM or MPASM
' Target PIC  : PIC16F690 or similar type compatible with LAB-X20 board
' Hardware    : LAB-X20 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.7          ' Define serial out pin
SI Var PORTB.5          ' Define serial in pin
B0 Var Byte

   ANSEL = %00000000    ' Set all pins digital
   ANSELH = %00000000

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

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

   End