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/****************************************************************************
 *   Copyright (C) 2009-2010 by Claas Anders "CaScAdE" Rathje               *
 *   admiralcascade@gmail.com                                               *
 *   Project-URL: http://www.mylifesucks.de/oss/c-osd/                      *
 *                                                                          *
 *   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.              *
 ****************************************************************************/

/*
 * structs 'n union for easy SPI transfer
 */
typedef struct {
        int16_t ampere;
        int32_t mah;
        int16_t volt;
} __attribute__((packed)) SPI_strom_data_t;

typedef struct {
        uint8_t c[10];
        uint8_t chk;
} __attribute__((packed)) SPI_char_buffer_t;

union SPI_buffer_t {
  SPI_strom_data_t data;
  SPI_char_buffer_t buffer;
};

volatile union SPI_buffer_t SPI_buffer;

/**
 * SPI interrupt handler
 */
ISR(SPI_STC_vect);

/**
 * init the SPI as master
 */
void SpiMasterInit(void);

/**
 * check if SPI transfer is still busy
 */
int TransferIsBusy(void);

/**
 * start a new transfer with length <len>
 */
void StartTransfer(uint16_t);

/**
 * send next command through spi
 */
void spi_send_next();