' Name        : I2CWX20.pbp
' Compiler    : PICBASIC PRO Compiler 2.6
' Assembler   : PM or MPASM
' Target PIC  : PIC16F690 or similar type compatible with LAB-X20 board
' Hardware    : LAB-X20 Experimenter Board
' Oscillator  : 4MHz external crystal
' 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 sends
' to LCD repeatedly.
'

' Define LCD registers and bits
Define LCD_DREG  PORTC
Define LCD_DBIT  0
Define LCD_RSREG PORTC
Define LCD_RSBIT 4
Define LCD_EREG  PORTC
Define LCD_EBIT  5

SDA Var PORTB.4  ' Data pin
SCL Var PORTB.6  ' Clock pin

address Var Word ' Address
B1      Var Byte ' Data 1
B2      Var Byte ' Data 2

   ANSEL = %00000000       ' Set all pins digital
   ANSELH = %00000000
   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