' Name        : UPPERX4.pbp
' Compiler    : PICBASIC PRO Compiler 2.6
' Assembler   : PM or MPASM
' Target PIC  : PIC12F675 or similar 8-pin
' Hardware    : Lab-X4 board
' Oscillator  : 4MHz internal
' Keywords    : SERIN, SEROUT
' Description : PICBASIC PRO code example showing upper case serial filter.
'

Include "modedefs.bas"  ' Include serial modes

Define OSCCAL_1K 1      ' Calibrate internal oscillator

TX Var	GPIO.1   ' Define serial out pin
RX Var	GPIO.2   ' Define serial in pin
B0 Var  Byte

   ANSEL = 0     ' Set all digital
   CMCON = 7     ' Analog comparators off

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

print:
   Serout TX, T2400, [B0] ' Send character
   Goto mainloop          ' Loops forever

   End