' Name        : I2CWXU.pbp
' Compiler    : PICBASIC PRO Compiler 2.6
' Assembler   : MPASM
' Target PIC  : PIC18F4550 or similar type
' Hardware    : LAB-XUSB Experimenter Board
' Oscillator  : 20MHz external
' Keywords    : I2CREAD, I2CWRITE, LCDOUT
' Description : PICBASIC PRO program to read and write to I2C SEEPROMs
' that require a word-sized address. Writes to the first 16 locations
' of an external serial EEPROM. Reads first 16 locations back and send
' to LCD repeatedly.
'

' Define LOADER_USED to allow use of the boot loader.
' This will not affect normal program operation.
Define LOADER_USED 1

' RESET_ORG can be set to move the BASIC program out of the way
' of any boot loader running from location 0, such as the
' Microchip USB boot loader
'Define RESET_ORG 800h

Define OSC 48      ' Core is running at 48MHz

' Define LCD pins
Define LCD_DREG  PORTD
Define LCD_DBIT  4
Define LCD_RSREG PORTE
Define LCD_RSBIT 0
Define LCD_EREG  PORTE
Define LCD_EBIT  1

SDA     Var PORTA.4     ' Data pin
SCL     Var PORTA.5     ' Clock pin
address Var Word        ' Address
B1      Var Byte        ' Data 1
B2      Var Byte        ' Data 2

   ADCON1 = 15          ' Set PORTA and PORTE to digital
   Low PORTE.2          ' LCD R/W line low (W)
   Pause 100            ' Wait for LCD to start up

   For address = 0 To 15 ' Loop 16 times
     B1 = address + 100  ' B1 is data for SEEPROM
     I2CWrite SDA, SCL, $A0, address, [B1] ' Write each location
     Pause 10            ' Delay 10ms after each write
   Next address

mainloop:
   For address = 0 To 15 Step 2 ' Loop 8 times
     I2CRead SDA, SCL, $A0, address, [B1, B2]   ' Read 2 locations in a row
     LCDOut $fe, 1, #address, ": ", #B1, " ", #B2, " "  ' Display 2 locations
     Pause 1000
   Next address
  GoTo mainloop

  End