' =========================================================================
'
'   File...... WDATA.SXB
'   Purpose... Display LED patterns from WDATA table
'   Author.... (c) Parallax, Inc. -- All Rights Reserved
'   E-mail.... support@parallax.com
'   Started...
'   Updated... 05 JUL 2006
'
' =========================================================================


' -------------------------------------------------------------------------
' Program Description
' -------------------------------------------------------------------------
'
' This program shows how to stre and retrieve 16-bit values from a WDATA
' table.  Note that the index for READ is updated by two for each loop
' as the WDATA table uses 2-byte values.

' -------------------------------------------------------------------------
' Device Settings
' -------------------------------------------------------------------------

DEVICE          SX28, OSC4MHZ, TURBO, STACKX, OPTIONX
FREQ            4_000_000
ID              "WDATA"

' -------------------------------------------------------------------------
' IO Pins
' -------------------------------------------------------------------------

Leds		VAR	RBC			' 16-bit RB/RC port

' -------------------------------------------------------------------------
' Variables
' -------------------------------------------------------------------------

idx             VAR     Byte

' =========================================================================
  PROGRAM Start
' =========================================================================

' -------------------------------------------------------------------------
' Program Code
' -------------------------------------------------------------------------

Start:
  TRIS_B = %00000000                            ' make LED pins outputs
  TRIS_C = %00000000

Main:
  DO
    READ Chaser + idx, Leds			' new pattern into LEDs
    PAUSE 50
    idx = idx + 2				' update index
    IF idx > 14 THEN				' end of table?
      idx = 0					'   yes, reset
    ENDIF 
  LOOP

' =========================================================================
' User Data
' =========================================================================

Chaser:
  WDATA %00000000_00001111
  WDATA %00000000_00111100
  WDATA %00000000_11110000
  WDATA %00000011_11000000
  WDATA %00001111_00000000
  WDATA %00111100_00000000
  WDATA %11110000_00000000
  WDATA %11000000_00000011