spi_module.h

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#ifndef SPI_MODULE_H
#define SPI_MODULE_H
 
#include <stdint.h>
 
#ifdef __cplusplus
extern "C" {
#endif
 
struct spi_module {
    uint8_t cs_pin;
 
    uint32_t clock;
 
    uint8_t mode;
 
    uint8_t read_mask;
 
    uint8_t write_mask;
 
    // The SPI transfer function to call (set by spi_module_init_*)
    int (*transfer)(struct spi_module *spi, uint8_t *tx_buffer,
                    uint8_t *rx_buffer, uint8_t length);
 
    // Internal user_data to store device handles, etc
    union {
        void *user_data_ptr;
        int user_data_int;
    };
};
 
uint8_t spi_read(struct spi_module *spi, uint8_t reg);
 
void spi_write(struct spi_module *spi, uint8_t reg, uint8_t val);
 
void spi_write_masked(struct spi_module *spi, uint8_t reg, uint8_t mask,
                      uint8_t val);
 
#ifdef __cplusplus
} // extern "C"
#endif
 
#endif // SPI_MODULE_H