#include <TinyDebug.h>

// Pins connected to the shift registers
const int clock = 0;  /* SRCLK */
const int latch = 1;  /* RCLK */
const int data = 2;   /* SER */

void setup() {
  Debug.begin();
  
  // Set the pins to output mode
  pinMode(clock, OUTPUT);
  pinMode(latch, OUTPUT);
  pinMode(data, OUTPUT);
}

void loop() {
  // Generate a random 16-bit number
  uint16_t pattern = random(65536);

  String binaryString = String(pattern, BIN);

  // Pad the string with leading zeros
  while (binaryString.length() < 16) {
    binaryString = "0" + binaryString;
  }

  Debug.println();
  Debug.println(binaryString);

  // Swap 15th bit with 10th bit and 14th bit with 11th bit
  binaryString[14] = binaryString[9];
  binaryString[13] = binaryString[10];
  
  Debug.println(binaryString);

  pattern = strtoul(binaryString.c_str(), NULL, 2);

  // Send the bits to the shift registers
  for (int i = 0; i < 16; i++) {
    digitalWrite(data, (pattern & (1 << i)) ? HIGH : LOW);
    digitalWrite(clock, HIGH);
    digitalWrite(clock, LOW);
  }

  // Latch the data into the outputs of the shift registers
  digitalWrite(latch, HIGH);
  digitalWrite(latch, LOW);

  // Wait for a while before the next pattern
  delay(1000);
}