#include <SPI.h>

#define CS 10

void setup() {
  char buffer[] = "Hello hamada";  // The data to send
  int bufferLength = strlen(buffer);  // Calculate the length of the buffer

  Serial.begin(9600);
  pinMode(CS, OUTPUT);
  digitalWrite(CS, HIGH);

  // Begin SPI communication
  SPI.begin();

  // Select the SPI device by pulling the CS pin LOW
  digitalWrite(CS, LOW);
  
  // Transfer the entire buffer at once using SPI.transfer function in a loop
  for (int i = 0; i <= bufferLength; i++) {
    buffer[i] = SPI.transfer(buffer[i]);
  }
  
  // Deselect the SPI device by pulling the CS pin HIGH
  digitalWrite(CS, HIGH);

  // End SPI communication
  SPI.end();

  // Print the received data
  Serial.println("Data received from SPI device:");
  Serial.println(buffer);
}

void loop() {
  // Nothing to do here
}