' Name        : BUTX20.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    : IF THEN
' Description : PICBASIC PRO program to show button press on LEDs.
'

   ANSEL = %00000000    ' Set all pins digital
   ANSELH = %00000000
   WPUA = %00000011     ' Enable pullups for buttons
   WPUB = %00000000
   OPTION_REG.7 = 0
   TRISA = %11001111    ' Set PORTA.4,5 (LEDs) to output, rest to input

mainloop:
   PORTA = 0            ' Turn off LEDs

   ' Check any button pressed to turn on LED
   If PORTA.0 = 0 Then  ' If 1st button pressed...
      PORTA.4 = 1       ' Turn on 1st LED
   Endif
   If PORTA.1 = 0 Then  ' If 2nd button pressed...
      PORTA.5 = 1       ' Turn on 2nd LED
   Endif
   Pause 2              ' Pause 2mS
   Goto mainloop        ' Do it forever

   End