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/*! \file spi.h \brief SPI interface driver. */
//*****************************************************************************
//
// File Name    : 'spi.h'
// Title                : SPI interface driver
// Author               : Pascal Stang - Copyright (C) 2000-2002
// Created              : 11/22/2000
// Revised              : 06/06/2002
// Version              : 0.6
// Target MCU   : Atmel AVR series
// Editor Tabs  : 4
//
// NOTE: This code is currently below version 1.0, and therefore is considered
// to be lacking in some functionality or documentation, or may not be fully
// tested.  Nonetheless, you can expect most functions to work.
//
///     \ingroup driver_avr
/// \defgroup spi SPI (Serial Peripheral Interface) Function Library (spi.c)
/// \code #include "spi.h" \endcode
/// \par Overview
///             Provides basic byte and word transmitting and receiving via the AVR
///     SPI interface.  Due to the nature of SPI, every SPI communication operation
/// is both a transmit and simultaneous receive.
///
///     \note Currently, only MASTER mode is supported.
//
// This code is distributed under the GNU Public License
//              which can be found at http://www.gnu.org/licenses/gpl.txt
//
//*****************************************************************************

// function prototypes


extern volatile double XE,YE;
extern volatile signed char nickgrad,rollgrad,nickgradkomp,rollgradkomp;
extern volatile double richtungorgr,richtungorgd,nick,roll;
extern volatile int iXsf,iYsf,iZsf;
extern volatile signed int Xmax, Xmin, Ymax, Ymin, Zmin, Zmax;
extern volatile double XrawCal, YrawCal, ZrawCal;
extern volatile int Xraw, Yraw, Zraw; // save values you get from the ASIC
extern volatile int Xoffset, Yoffset, Zoffset;
extern volatile int azimuthgrad;
extern double XEx,XEy,XEz,YEy,YEz;
int MagnetG;
// SPI interface initializer
void spiInit(void);

// spiSendByte(u08 data) waits until the SPI interface is ready
// and then sends a single byte over the SPI port.  This command
// does not receive anything.
void spiSendByte(unsigned char data);

// spiTransferByte(u08 data) waits until the SPI interface is ready
// and then sends a single byte over the SPI port.  The function also
// returns the byte that was received during transmission.
unsigned char spiTransferByte(unsigned char data);

// spiTransferWord(u08 data) works just like spiTransferByte but
// operates on a whole word (16-bits of data).
unsigned int spiTransferWord(unsigned int data);


extern int KompassRead(void);
extern void ReadEepromKompassValues(void);