#include <wiringPi.h>
#include <wiringPiI2C.h>

const int adcAddr = 0x48; // ADC address
const int serialBaudRate = 115200; // Serial monitor baud rate
const float toggleDelay = 0.2; // Delay between toggling bits, in microseconds

int main(void) {
  int fd; // File descriptor for I2C device
  uint32_t buffer[8] = {0}; // Initialize buffer array with zeroes
  uint8_t bitCount = 0; // Number of generated bits

  // Initialize WiringPi and open I2C device
  wiringPiSetup();
  fd = wiringPiI2CSetup(adcAddr);

  // Print buffer values in binary format
  for (int i = 0; i < 8; i++) {
    uint32_t randomValue = 0; // Initialize random value

    while (bitCount < 32) {
      uint16_t adcValue = wiringPiI2CReadReg16(fd, 0x00); // Read ADC value
      uint32_t newBit = adcValue & 0x01; // Extract LSB from ADC value
      randomValue = (randomValue << 1) | newBit; // Add new bit to LSB
      bitCount++; // Increment number of generated bits
      delayMicroseconds(toggleDelay); // Delay
    }

    buffer[i] = randomValue; // Save random value in buffer array
    bitCount = 0; // Reset number of generated bits
  }

  // Print buffer values in binary format
  for (int i = 0; i < 8; i++) {
    Serial.print(formatBinary(buffer[i])); // Print generated 32-bit values in binary format
  }
  Serial.println(); // New line to separate from other outputs

  return 0;
}

String formatBinary(uint32_t number) {
  String binaryString = String(number, BIN); // Convert to binary string
  while (binaryString.length() < 32) {
    binaryString = "0" + binaryString; // Pad with leading zeroes
  }
  return binaryString;
}