gadget-tester/spi_drv.h

#ifndef SPI_DRV_H_INCLUDED
#define SPI_DRV_H_INCLUDED
#include <stdint.h>

void spi_init(int polarity, int phase);
void spi_write(const char byte);
uint8_t spi_read(void);
void spi_cs_on(void);
void spi_cs_off(void);

#endif