spi_spidev_comm.h

/**
  \file spi_spidev_comm.h
   
  \author G. Icking-Konert
  \date 2017-12-10
  \version 0.1
   
  \brief declaration of SPI comm routines via spidev library
   
  declaration of routines for SPI communication using the spidev library.
  
*/

// for including file only once
#ifndef _SPI_SPIDEV_COMM_H_
#define _SPI_SPIDEV_COMM_H_


// generic ANSI
#include <stdio.h>
#include <stdlib.h>
#include <stdint.h>
#include <inttypes.h>

// only if SPI via spidev is set in Makefile
#if defined(USE_SPIDEV)

  // OS specific: Win32
  #if defined(WIN32)
    #error Windows not supported
  
  // OS specific: Posix
  #elif defined(__APPLE__) || defined(__unix__)
    #define HANDLE  int     // comm port handler is int
    #include <fcntl.h>      // File control definitions
    #include <termios.h>    // Posix terminal control definitions
    #include <errno.h>      // error number definitions
    #include <sys/types.h>
    #include <dirent.h>
    #include <string.h>
    #include <sys/ioctl.h>
    #include <unistd.h>
    #include <sys/ioctl.h>
    #include <linux/types.h>
    #include <linux/spi/spidev.h>
  
  #else
    #error OS not supported
  #endif
  
  
  /// init SPI port
  HANDLE      init_spi_spidev(const char *port, uint32_t baudrate);
  
  /// close SPI port
  void        close_spi_spidev(HANDLE *fp);
  
  /// send data via SPI (no parallel receive)
  uint32_t    send_spi_spidev(HANDLE fp, uint32_t lenTx, char *Tx);
  
  /// receive data via SPI (no parallel send)
  uint32_t    receive_spi_spidev(HANDLE fp, uint32_t lenRx, char *Rx);
  
  /// send & receive data via SPI (parallel send)
  void        spi_transfer(HANDLE fp, int len, uint8_t *Tx, uint8_t *Rx);
  
#endif // USE_SPIDEV
  
#endif // _SPI_SPIDEV_COMM_H_

// end of file