Example program that write 1,2,3,4,5 to the 25LC010A eeprom chip.

rpi_spi_eepromtest.c

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <errno.h>
#include <stdint.h>
#include <wiringPiSPI.h>

int main (void) {
  int i ;
  printf ("Raspberry Pi SPI 25LC010A program\n") ;

  // Create a spi connection with 10MHz (This is the maximum of the 25LC010A)
  if (wiringPiSPISetup (0, 10000000) < 0)
  {
    fprintf (stderr, "Unable to open SPI device 0: %s\n", strerror (errno)) ;
    exit (1) ;
  }
  
  // We want to use the first SPI channel
  int ce = 0;
  uint8_t writeCommand[7];

  // Enable writing
  writeCommand[0] = 0b110;
  wiringPiSPIDataRW (ce, writeCommand, 1);

  // Write data
  writeCommand[0] = 0b10;
  writeCommand[1] = 9;
  writeCommand[2] = 1;
  writeCommand[3] = 2;
  writeCommand[4] = 3;
  writeCommand[5] = 4;
  writeCommand[6] = 5;
  wiringPiSPIDataRW (ce, writeCommand, 7);
  
  // Wait a moment after the data has been written. 
  usleep(20000);

  int e = 0;
  for(e = 0; e < 20000; e++) { 

     // Clear the buffer
     for(i = 0; i < 7; i++) {
      writeCommand[i] = 0xFF; 
     }

     // Read data. We need to write 7 bytes. The read data will be set to the given buffer array.
     // For each byte we write a byte will be read
     writeCommand[0] = 0b11;
     writeCommand[1] = 9;
     wiringPiSPIDataRW(ce, writeCommand, 7);

     for(i = 2; i < 7; i++) {
           printf ("Buffer at %d: %02X\n", i, writeCommand[i]) ;
     }
  }

  return 0 ;
}

hii, in rasperry pi 3 there are 2 spi bus 0 and 1 ,i want to use spi1 if wiringPiSPISetup() function has access to spi1