/****************************************************************************
 *   Copyright (C) 2009-2012 by Claas Anders "CaScAdE" Rathje               *
 *   admiralcascade@gmail.com                                               *
 *   Project-URL: http://www.mylifesucks.de/oss/c-strom/                    *
 *                                                                          *
 *   This program is free software; you can redistribute it and/or modify   *
 *   it under the terms of the GNU General Public License as published by   *
 *   the Free Software Foundation; either version 2 of the License.         *
 *                                                                          *
 *   This program is distributed in the hope that it will be useful,        *
 *   but WITHOUT ANY WARRANTY; without even the implied warranty of         *
 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the          *
 *   GNU General Public License for more details.                           *
 *                                                                          *
 *   You should have received a copy of the GNU General Public License      *
 *   along with this program; if not, write to the                          *
 *   Free Software Foundation, Inc.,                                        *
 *   59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.              *
 ****************************************************************************/

Console listens at 8n1 19200... Commands are explained there... 


#############################################################################
i2c/twi Sample snipplet
    // i2c master libary by Peter Fleury used in this example
    // http://homepage.hispeed.ch/peterfleury/avr-software.html#libs

    #define CSTROM_I2C 0x20
        
    i2c_init();
    sei(); 
    
    union SPI_buffer_t SPI_buffer;
		// @see http://svn.mikrokopter.de/mikrowebsvn/filedetails.php?repname=Projects&path=%2FC-OSD%2Ftrunk%2Fspi.h

		if(!(i2c_start(CSTROM_I2C+I2C_WRITE))) { // check for slave ready
			i2c_write(0x00); // start with buffer address 0
		    i2c_rep_start(CSTROM_I2C+I2C_READ); // start reading
			for (uint8_t i = 0; i < 9; i++) { // loop through first 9 positions
				SPI_buffer.buffer.c[i] = i2c_readAck();
			}
			SPI_buffer.buffer.c[9] = i2c_readNak(); // last position does not take ACK
			i2c_stop();
		}
		uart_puts(itoa(SPI_buffer.data.volt, s, 10));
		uart_puts_pgm(PSTR("V\r\n"));
#############################################################################