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    char buffer_out[SPI4_BUFFER_OUT_SIZE];

    uint8_t buffer_out[SPI4_BUFFER_OUT_SIZE];

    int buffer_out_ind;

    uint32_t buffer_out_ind;

    int buffer_out_len;

    uint32_t buffer_out_len;

    char write_blank;

    uint8_t write_blank;

    char buffer_in[SPI4_BUFFER_IN_SIZE];

    uint8_t buffer_in[SPI4_BUFFER_IN_SIZE];

    int buffer_in_ind;

    uint32_t buffer_in_ind;

    int buffer_in_len;

    uint32_t buffer_in_len;

    void (*rx_callback)(char, char *);

    void (*rx_callback)(uint8_t, uint8_t *);

int SPI4_Read(int length, void (*rx_callback)(char, char *));

uint8_t SPI4_Read(uint32_t length, void (*rx_callback)(uint8_t, uint8_t *));

int SPI4_Write(char *array, int length, void (*tx_callback)(void));

uint8_t SPI4_Write(uint8_t *array, uint32_t length, void (*tx_callback)(void));