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/****************************************************************************
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 *   Copyright (C) 2009-2012 by Claas Anders "CaScAdE" Rathje               *
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 *   admiralcascade@gmail.com                                               *
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 *   Project-URL: http://www.mylifesucks.de/oss/c-strom/                    *
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 *                                                                          *
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 *   This program is free software; you can redistribute it and/or modify   *
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 *   it under the terms of the GNU General Public License as published by   *
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 *   the Free Software Foundation; either version 2 of the License.         *
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 *                                                                          *
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 *   This program is distributed in the hope that it will be useful,        *
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 *   but WITHOUT ANY WARRANTY; without even the implied warranty of         *
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 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the          *
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 *   GNU General Public License for more details.                           *
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 *                                                                          *
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 *   You should have received a copy of the GNU General Public License      *
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 *   along with this program; if not, write to the                          *
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 *   Free Software Foundation, Inc.,                                        *
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 *   59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.              *
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 ****************************************************************************/
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Console listens at 8n1 19200... Commands are explained there...
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#############################################################################
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i2c/twi Sample snipplet
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    // i2c master libary by Peter Fleury used in this example
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    // http://homepage.hispeed.ch/peterfleury/avr-software.html#libs
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    #define CSTROM_I2C 0x20
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    i2c_init();
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    sei();
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    union SPI_buffer_t SPI_buffer;
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		// @see http://svn.mikrokopter.de/mikrowebsvn/filedetails.php?repname=Projects&path=%2FC-OSD%2Ftrunk%2Fspi.h
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		if(!(i2c_start(CSTROM_I2C+I2C_WRITE))) { // check for slave ready
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			i2c_write(0x00); // start with buffer address 0
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		    i2c_rep_start(CSTROM_I2C+I2C_READ); // start reading
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			for (uint8_t i = 0; i < 9; i++) { // loop through first 9 positions
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				SPI_buffer.buffer.c[i] = i2c_readAck();
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			}
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			SPI_buffer.buffer.c[9] = i2c_readNak(); // last position does not take ACK
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			i2c_stop();
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		}
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		uart_puts(itoa(SPI_buffer.data.volt, s, 10));
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		uart_puts_pgm(PSTR("V\r\n"));
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#############################################################################