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/*! \file spi.h \brief SPI interface driver. */
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//*****************************************************************************
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//
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// File Name    : 'spi.h'
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// Title                : SPI interface driver
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// Author               : Pascal Stang - Copyright (C) 2000-2002
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// Created              : 11/22/2000
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// Revised              : 06/06/2002
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// Version              : 0.6
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// Target MCU   : Atmel AVR series
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// Editor Tabs  : 4
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//
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// NOTE: This code is currently below version 1.0, and therefore is considered
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// to be lacking in some functionality or documentation, or may not be fully
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// tested.  Nonetheless, you can expect most functions to work.
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//
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///     \ingroup driver_avr
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/// \defgroup spi SPI (Serial Peripheral Interface) Function Library (spi.c)
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/// \code #include "spi.h" \endcode
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/// \par Overview
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///             Provides basic byte and word transmitting and receiving via the AVR
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///     SPI interface.  Due to the nature of SPI, every SPI communication operation
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/// is both a transmit and simultaneous receive.
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///
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///     \note Currently, only MASTER mode is supported.
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//
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// This code is distributed under the GNU Public License
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//              which can be found at http://www.gnu.org/licenses/gpl.txt
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//
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//*****************************************************************************
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// function prototypes
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extern volatile double XE,YE;
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extern volatile signed char nickgrad,rollgrad,nickgradkomp,rollgradkomp;
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extern volatile double richtungorgr,richtungorgd,nick,roll;
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extern volatile int iXsf,iYsf,iZsf;
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extern volatile signed int Xmax, Xmin, Ymax, Ymin, Zmin, Zmax;
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extern volatile double XrawCal, YrawCal, ZrawCal;
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extern volatile int Xraw, Yraw, Zraw; // save values you get from the ASIC
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extern volatile int Xoffset, Yoffset, Zoffset;
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extern volatile int azimuthgrad;
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extern double XEx,XEy,XEz,YEy,YEz;
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int MagnetG;
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// SPI interface initializer
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void spiInit(void);
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// spiSendByte(u08 data) waits until the SPI interface is ready
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// and then sends a single byte over the SPI port.  This command
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// does not receive anything.
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void spiSendByte(unsigned char data);
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// spiTransferByte(u08 data) waits until the SPI interface is ready
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// and then sends a single byte over the SPI port.  The function also
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// returns the byte that was received during transmission.
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unsigned char spiTransferByte(unsigned char data);
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// spiTransferWord(u08 data) works just like spiTransferByte but
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// operates on a whole word (16-bits of data).
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unsigned int spiTransferWord(unsigned int data);
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extern int KompassRead(void);
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extern void ReadEepromKompassValues(void);
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