spi.h

#ifndef _SYSIO_SPI_H_
#define _SYSIO_SPI_H_
#include <sysio/defs.h>
#ifdef __cplusplus
  extern "C" {
#endif
/* ========================================================================== */

/* constants ================================================================ */
#define SPI_CPHA    0x01 
#define SPI_CPOL    0x02 
#define SPI_REG_RW_BIT 7 
typedef enum {
  eSpiMode0 = (0|0),
  eSpiMode1 = (0|SPI_CPHA),
  eSpiMode2 = (SPI_CPOL|0),
  eSpiMode3 = (SPI_CPOL|SPI_CPHA),
  eSpiModeNotSet = -1 
} eSpiMode;

typedef enum {
  eSpiNumberingMsb = 0, 
  eSpiNumberingLsb = 1,
  eSpiNumberingNotSet = -1 
} eSpiNumbering;

typedef enum {
  eSpiBits8 = 8, 
  eSpiBits7 = 7, 
  eSpiBitsNotSet = -1 
} eSpiBits;

/* structures =============================================================== */
typedef struct xSpiIos {
  eSpiMode mode; 
  eSpiNumbering lsb; 
  uint8_t bits; 
  uint32_t speed; 
} xSpiIos;


/* internal public functions ================================================ */
int iSpiOpen (const char *device);

int iSpiClose (int fd);

int iSpiSetConfig (int fd, const xSpiIos * config);

int iSpiGetConfig (int fd, xSpiIos * config);

int iSpiRead (int fd, uint8_t * buffer, uint8_t len);

int iSpiWrite (int fd, uint8_t * buffer, uint8_t len);

int iSpiXfer (int fd, uint8_t * tx_buffer, uint8_t tx_len, uint8_t *rx_buffer, uint8_t rx_len);

int iSpiReadReg8 (int fd, uint8_t reg);

long lSpiReadReg16 (int fd, uint8_t reg);

int iSpiReadRegBlock (int fd, uint8_t reg, uint8_t * buffer, uint8_t len);

int iSpiWriteReg8 (int fd, uint8_t reg, uint8_t data);

int iSpiWriteReg16 (int fd, uint8_t reg, uint16_t data);

int iSpiWriteRegBlock (int fd, uint8_t reg, const uint8_t * buffer, uint8_t len);

/* ========================================================================== */
#ifdef __cplusplus
  }
#endif
#endif /*_SYSIO_SPI_H_ defined */