' Name        : I2CWX.pbp
' Compiler    : PICBASIC PRO Compiler 2.6
' Assembler   : PM or MPASM
' Target PIC  : 40-pin 16F877A, 18F452 or similar
' Hardware    : LAB-X1 Experimenter Board
' Oscillator  : 4MHz external crystal
' Keywords    : I2CREAD, I2CWRITE, LCDOUT, STEP
' 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

' Define LCD registers and bits
Define LCD_DREG  PORTD
Define LCD_DBIT  4
Define LCD_RSREG PORTE
Define LCD_RSBIT 0
Define LCD_EREG  PORTE
Define LCD_EBIT  1

SCL VAR PORTC.3   ' Clock pin
SDA VAR PORTC.4   ' Data pin
B1  VAR BYTE      ' Data 1
B2  VAR BYTE      ' Data 2

address VAR WORD  ' Address

   ADCON1 = 7     ' 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