spi.h

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#ifndef INCLUDE_INCLUDE_SPI_H_
#define INCLUDE_INCLUDE_SPI_H_

enum spi_slave {
  SSB2, 
  SSB3, 
  SSE2  
};

int spi_init(void);

int spi_ready(void);

int spi_send_n(enum spi_slave *slave, unsigned char *data, int length);

int spi_send(enum spi_slave *slave, unsigned char data);

int spi_recieve(enum spi_slave *slave, unsigned char *out);

int spi_recieve_n(enum spi_slave *slave, unsigned char *out, int length);

int spi_duplex(enum spi_slave *slave, unsigned char *data, unsigned char *out,
               int length);

int spi_set_slave_select(enum spi_slave *slave, unsigned char state);

int spi_push(enum spi_slave *slave, unsigned char data, unsigned char *out);
 
#endif // INCLUDE_INCLUDE_SPI_H_