' Name        : TESTX20.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    : ADCIN, HSERIN, HSEROUT, LCDOUT
' Description : PICBASIC PRO test program for LAB-X20 (16F690).
'

' Define LCD registers and bits
Define LCD_DREG  PORTC
Define LCD_DBIT  0
Define LCD_RSREG PORTC
Define LCD_RSBIT 4
Define LCD_EREG  PORTC
Define LCD_EBIT  5

' Alias pins
SW1  Var PORTA.0
SW2  Var PORTA.1
AN2  Con 2             ' PORTA.2
LED1 Var PORTA.4
LED2 Var PORTA.5

' Allocate variables
char Var byte
x    Var byte

   ANSEL = %00000100    ' Set PORTA.2 analog, rest digital
   ANSELH = %00000000
   WPUA = %00000011     ' Enable pullups for buttons
   WPUB = %00000000
   OPTION_REG.7 = 0
   Pause 100            ' Wait for LCD to start

mainloop:
   Adcin AN2, x  ' Read ADC
   Lcdout $fe, 1, "Pot1 = ", #x ' Send value to LCD
   Gosub getchar ' Get char from serial port

   If char = $55 Then
      Lcdout $fe, $c0, "loopback"
    Endif
   If !SW1 Then  ' Check switch 1
      High LED1  ' Turn on LED 1
   Else
      Low LED1   ' Turn off LED 1
   Endif
   If !SW2 Then  ' Check switch 2
      High LED2  ' Turn on LED 2
   Else
      Low LED2   ' Turn off LED 2
   Endif
   Pause 200     ' Do it all about 5 times a second
   Goto mainloop ' Do it forever

' Subroutine to get a char from serial port
getchar:
   char = 0
   Hserin 0, tlabel, [char]

tlabel:
   Hserout [$55]
   Return

   End