#include <SPI.h>

#define cs_pin 44  // Chip Select pin (must match the slave setup)

uint8_t dataToSend[256];

void setup() {
  Serial.begin(115200);
  Serial.println("SPI Master Starting...");

  pinMode(cs_pin, OUTPUT);
  digitalWrite(cs_pin, HIGH);

  SPI2.begin();
}

void loop() {

  for (int i = 0; i < 256; i++) {
    dataToSend[i] = i;
  }

  SPI2.beginTransaction(SPISettings(22000000, MSBFIRST, SPI_MODE0));
  Serial.println("Sending data...");
  digitalWrite(cs_pin, LOW);
  SPI2.transfer(dataToSend, 256);  // Send the whole array at once
  digitalWrite(cs_pin, HIGH);
  Serial.println("Data sent.");
  SPI2.endTransaction();

  delayMicroseconds(1000); // Wait before sending again
}