' Example program to test I2C-ADC (I2C 12-bit, 8-CH Analog-to-Digital Converter) unit.
' The program configures the device as the Single-Ended Inputs mode.
' Input analog voltages from all 8 channels are capture and display on debug terminal every 1 second.
'
' Note: This program was tested using PICAXE 28X-1 Firmware version 2
' Setup: A1=0, A0=0
'
' Document: AD7828 datasheet
' Updated: September 4, 2008
' E-mail: support@gravitech.us
' Gravitech
' (C) Copyright 2008 All Rights Reserved
'************************************************************

symbol I2C_ADDR = $90		' I2C address

symbol ADVAL = w2				' Store A/D value
symbol ADVAL_HIGHBYTE = b5	' High byte of ADVAL
symbol ADVAL_LOWBYTE = b4	' Low byte of ADVAL
symbol DAT   = b1          ' Configuring data
symbol i     = b2          ' Counter

MAIN:

	PAUSE 1000
  	FOR i = 0 TO 7
  	LOOKUP i,(%10001100,%11001100,%10011100,%11011100,%10101100,%11101100,%10111100,%11111100),DAT
   								' Lookup table for configuring data
   i2cslave I2C_ADDR, i2cslow, i2cbyte
                                         
  	writei2c (DAT)                						' Configure the device to read each CH
  	PAUSE 1
  	readi2c (ADVAL_HIGHBYTE,ADVAL_LOWBYTE)				' READ A/D value
	sertxd ("A/D value CH",#i," is ",#ADVAL,CR,LF)  ' Display A/D value
  	NEXT
  	
  	sertxd (CR,CR,LF)

  	GOTO MAIN

END