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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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 * 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();