ME Labs, Inc. | 1-719-520-5323 | Example Program - BPX4.pbp

' Name        : BPX4.pbp
' Compiler    : PICBASIC PRO Compiler 2.6
' Assembler   : PM or MPASM
' Target PIC  : PIC16F688
' Hardware    : LAB-X4 Experimenter Board
' Oscillator  : 4MHz internal
' Keywords    : SERIN
' Description : PICBASIC PRO program for LAB-X4 serial LCD controller.
' Note: Set MCLR_OFF in config.
'

' Define LCD registers and bits (used for init only)
Define LCD_DREG  PORTC
Define LCD_DBIT  0
Define LCD_RSREG PORTC
Define LCD_RSBIT 4
Define LCD_EREG  PORTC
Define LCD_EBIT  5

LCD_DATA Var PORTC      ' LCD data port
LCD_TRIS Var TRISC      ' LCD data tristate
LCD_RS   Var PORTC.4    ' LCD register select
LCD_E    Var PORTC.5    ' LCD enable
RX       Var PORTA.2    ' Serial receive
c        Var Byte       ' Serial character
mode     Var Byte       ' Serial mode
s        Var Byte       ' Swapped character

   TRISA = $3f  ' Set PORTA for all inputs
   OPTION_REG.7 = 0 ' Enable internal pullups
   ANSEL = 0    ' Set all digital
   CMCON0 = 7   ' Analog comparators off

   Pause 100    ' Wait for LCD to start up

   mode = 0     ' Preset serial mode for 2400, true
   If PORTA.4 == 0 Then mode = 2        ' Set for 9600
   If PORTA.5 == 0 Then mode = mode + 4 ' Set for inverted

   Lcdout $fe, 1 ' Clear screen (also inits LCD)

mainloop:
   LCD_TRIS = 0  ' Set LCD port for all output
   LCD_RS = 1    ' Set for data

   Serin RX, mode, c    ' Get serial character

   If c == $fe Then     ' Check for command marker
      LCD_RS = 0        ' Clear for command
      Serin RX, mode, c ' Get command
   Endif

'  s = c >> 4    ' Move upper nibble to lower (slow way)
   s = c & $f0   ' Mask to upper nibble only
   @ swapf _s,f  ; Move upper nibble to lower (fast way)

   LCD_E = 1    ' Enable LCD
   LCD_DATA = LCD_DATA & $f0 ' Mask off lower nibble
   LCD_DATA = LCD_DATA | s   ' Put upper nibble on LCD data bus
   LCD_E = 0    ' Not enable LCD

   c = c & $0f  ' Mask to lower nibble only

   LCD_E = 1    ' Enable LCD
   LCD_DATA = LCD_DATA & $f0 ' Mask off lower nibble
   LCD_DATA = LCD_DATA | c   ' Put lower nibble on LCD data bus
   LCD_E = 0    ' Not enable LCD
   Goto mainloop' Do it forever

   End

           

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