libsoc SPI Test

#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <sys/wait.h>
#include <stdint.h>
#include <string.h>
#include <sys/time.h>

#include "libsoc_spi.h"
#include "libsoc_debug.h"

#define SPI_DEVICE   0
#define CHIP_SELECT  0

#define LEN 8
static uint8_t tx[LEN], rx[LEN];

// For testing SPI with loopback: MISO connected to MOSI

int main()
{
  int i;
  libsoc_set_debug(1);

  spi* spi_dev = libsoc_spi_init(SPI_DEVICE, CHIP_SELECT);

  if (!spi_dev)
  {
    printf("Failed to get spidev device!\n");
    return EXIT_FAILURE;
  }

  // SPI Settings
  libsoc_spi_set_mode(spi_dev, MODE_0);
  libsoc_spi_get_mode(spi_dev);

  libsoc_spi_set_speed(spi_dev, 1000000);
  libsoc_spi_get_speed(spi_dev);

  libsoc_spi_set_bits_per_word(spi_dev, BITS_8);
  libsoc_spi_get_bits_per_word(spi_dev);

  // set TX buffer to 0,1,2,3,...
  for (i = 0; i < LEN; i++)
  {
      tx[i] = i;
  }

  // clear RX buffer
  memset(rx, 0, LEN);

 // Do a transfer
  if (libsoc_spi_rw(spi_dev, tx, rx, LEN) != EXIT_SUCCESS)
  {
      printf("SPI RW Failed.\n");
  }

  // Print received bytes
  for (i = 0; i < LEN; i++)
  {
      printf("[0x%02X]", rx[i]);
  }
  printf("\n");

  libsoc_spi_free(spi_dev);

  return EXIT_SUCCESS;
}