arduino2 USB SPI bridge

#include <SPI.h>
 int mosi = 12;          //assigning variables to pins
 int sck = 13;
 int ss = 10;
 int miso = 11;

byte byteRead;
char buffer[2];

void setup() {
  pinMode(mosi,OUTPUT);     //Configuring pins as input and output
  pinMode(sck,OUTPUT);
  pinMode(ss,OUTPUT);
  pinMode(miso,INPUT);
  /*
  SPI.setDataMode(SPI_MODE0);  //setting mode for clk phase & pol
  SPI.setBitOrder(MSBFIRST);   // setting bit order for transfer
  SPI.setClockDivider(SPI_CLOCK_DIV2);     //setting clock to 2 MHz
  digitalWrite(10,HIGH);     //keeping slave device unactive
  */
  Serial.begin(9600);
  Serial.println("arduino2 master");
  SPI.beginTransaction(SPISettings(14000000, MSBFIRST, SPI_MODE0));
  //SPI.beginTransaction(SPISettings(50000, MSBFIRST, SPI_MODE0));
  SPI.begin();
}

void loop() {
  if (Serial.available()) {
    byteRead = Serial.read();
    buffer[0] =byteRead;
    buffer[1] ='¥0';
    SPI.transfer(buffer, 2);
    Serial.write(buffer[0]);
  }
}