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/****************************************************************************
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/****************************************************************************
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 *   Copyright (C) 2009 by Claas Anders "CaScAdE" Rathje                    *
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 *   Copyright (C) 2009 by Claas Anders "CaScAdE" Rathje                    *
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 *   admiralcascade@gmail.com                                               *
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 *   admiralcascade@gmail.com                                               *
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 *   Project-URL: http://www.mylifesucks.de/oss/c-osd/                      *
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 *   Project-URL: http://www.mylifesucks.de/oss/c-osd/                      *
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 *                                                                          *
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 *                                                                          *
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 *   This program is free software; you can redistribute it and/or modify   *
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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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 *   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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 *   the Free Software Foundation; either version 2 of the License.         *
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 *                                                                          *
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 *                                                                          *
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 *   This program is distributed in the hope that it will be useful,        *
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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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 *   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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 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the          *
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 *   GNU General Public License for more details.                           *
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 *   GNU General Public License for more details.                           *
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 *                                                                          *
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 *                                                                          *
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 *   You should have received a copy of the GNU General Public License      *
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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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 *   along with this program; if not, write to the                          *
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 *   Free Software Foundation, Inc.,                                        *
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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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 *   59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.              *
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 ****************************************************************************/
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 ****************************************************************************/
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/*
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 * structs 'n union for easy SPI transfer
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 */
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typedef struct {
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        int16_t ampere;
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        int32_t mah;
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        int16_t volt;
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} __attribute__((packed)) SPI_strom_data_t;
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typedef struct {
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        uint8_t c[10];
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        uint8_t chk;
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} __attribute__((packed)) SPI_char_buffer_t;
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union SPI_buffer_t {
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  SPI_strom_data_t data;
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  SPI_char_buffer_t buffer;
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};
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volatile union SPI_buffer_t SPI_buffer;
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/**
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/**
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 * SPI interrupt handler
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 * SPI interrupt handler
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 */
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 */
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ISR(SPI_STC_vect);
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ISR(SPI_STC_vect);
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/**
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/**
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 * init the SPI as master
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 * init the SPI as master
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 */
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 */
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void SpiMasterInit(void);
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void SpiMasterInit(void);
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/**
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/**
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 * check if SPI transfer is still busy
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 * check if SPI transfer is still busy
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 */
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 */
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int TransferIsBusy(void);
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int TransferIsBusy(void);
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/**
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/**
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 * start a new transfer of <data> with length <len>
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 * start a new transfer with length <len>
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 */
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void StartTransfer(uint16_t);
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/**
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 * send next command through spi
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 */
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 */
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void StartTransfer(unsigned char *, uint16_t);
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void spi_send_next();
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