spidev.h

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#ifndef _INCLUDE_SPI_SPIDEV_H_
#define _INCLUDE_SPI_SPIDEV_H_
 
#if defined (__linux__)
    #include <linux/spi/spidev.h>
#elif defined (__FreeRTOS__)
    #include <stdint.h>
 
    #define SPI_CPHA 0x01
 
    #define SPI_CPOL 0x02
 
    #define SPI_MODE_0 (0 | 0)
 
    #define SPI_MODE_1 (0 | SPI_CPHA)
 
    #define SPI_MODE_2 (SPI_CPOL | 0)
 
    #define SPI_MODE_3 (SPI_CPOL | SPI_CPHA)
 
    #define SPI_IOC_MAGIC ('s')
 
    struct spi_ioc_transfer
    {
        uint64_t tx_buf;
 
        uint64_t rx_buf;
 
        uint32_t len; 
        uint32_t speed_hz; 
        uint32_t delay_usec;
        uint8_t  bits_per_word; 
        uint8_t  cs_change;
        uint32_t pad; 
    };
 
    #define SPI_MSGSIZE(N)  \
        ((((N)*(sizeof (struct spi_ioc_transfer))) < (1 << IOC_SIZEBITS)) \
            ? ((N)*(sizeof (struct spi_ioc_transfer))) : 0)
 
    #define SPI_IOC_MESSAGE(N) \
        IOW(SPI_IOC_MAGIC, 0, sizeof(char[SPI_MSGSIZE(N)]))
 
    #define SPI_IOC_RD_MODE IOR(SPI_IOC_MAGIC, 1, sizeof(uint8_t))
 
    #define SPI_IOC_WR_MODE IOW(SPI_IOC_MAGIC, 1, sizeof(uint8_t))
 
    #define SPI_IOC_RD_LSB_FIRST IOR(SPI_IOC_MAGIC, 2, sizeof(uint8_t))
 
    #define SPI_IOC_WR_LSB_FIRST IOW(SPI_IOC_MAGIC, 2, sizeof(uint8_t))
 
    #define SPI_IOC_RD_BITS_PER_WORD IOR(SPI_IOC_MAGIC, 3, sizeof(uint8_t))
 
    #define SPI_IOC_WR_BITS_PER_WORD IOW(SPI_IOC_MAGIC, 3, sizeof(uint8_t))
 
    #define SPI_IOC_RD_MAX_SPEED_HZ IOR(SPI_IOC_MAGIC, 4, sizeof(uint32_t))
 
    #define SPI_IOC_WR_MAX_SPEED_HZ IOW(SPI_IOC_MAGIC, 4, sizeof(uint32_t))
 
    #define SPI_IOC_GET_OBJECT_REFERENCE IOR(SPI_IOC_MAGIC, 5, sizeof(void*))
 
#else
    #error SPI drivers not supported on this OS
#endif
 
#endif /* _INCLUDE_SPI_SPIDEV_H_ */