Example program provided by Embedded Systems Academy, Copyright 2000
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This example: MASTER - name of application: main.c
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Demonstration of talking to a another I2C node on the I2C bus.


Hardware requirements
=====================
2 x Phytec RDK 591 with Philips 591
Null modem cable (straight through connection)


Software requirements
=====================
Phytec Flash Tools (part of RDK 591)
  www.phytec.com
Raisonance 8051 compiler system - EVAL version sufficient
  www.raisonance.com
or Keil 8051 Compiler System - EVAL version sufficient
  www.keil.com
Optional: Development Assistant-C by RistanCASE
  www.ristancase.ch
SLAVE example.
  www.esacademy.com


Tested using
============

Raisonance 51 Toolset version 6.1.1
Keil C51 Toolset version 6.00


Application description
=============================================
Raisonance specific files have their names prefixed with 'r'.
Keil specific files have their names prefixed with 'k'.
The same source files are used for both compilers.

This program sends a data byte to another 591 microcontroller
the data depending on whether switch S1 or S2 is pressed,
complete with error checking and timeout recovery.

The function slave_write_byte does not return until either a successful
transmission or an error. The function waits up to 22ms for the other 591
to be ready using a polling method. The status may be read in the variable
i2c_status and will be I2C_OK or I2C_ERROR.
The slave address must be F2H.