// === Pin Mapping - 74HC165 (input tombol) ===
#define PL   32   // Parallel Load
#define CP   33   // Clock
#define Q7   34   // Serial Out

// === Pin Mapping - 74HC595 (output LED) ===
#define DS    5   // Serial Data Input
#define SHCP 26   // Shift Register Clock
#define STCP 25   // Storage Register Clock

void setup() {
  Serial.begin(115200);

  // 74HC165
  pinMode(PL, OUTPUT);
  pinMode(CP, OUTPUT);
  pinMode(Q7, INPUT);

  // 74HC595
  pinMode(DS, OUTPUT);
  pinMode(SHCP, OUTPUT);
  pinMode(STCP, OUTPUT);

  digitalWrite(PL, HIGH);
  digitalWrite(CP, LOW);
  digitalWrite(SHCP, LOW);
  digitalWrite(STCP, LOW);

  Serial.println("=== TES 74HC165 -> 74HC595 ===");
}

byte read165() {
  byte value = 0;
  digitalWrite(PL, LOW);
  delayMicroseconds(5);
  digitalWrite(PL, HIGH);

  for (int i = 0; i < 8; i++) {
    value <<= 1;
    if (digitalRead(Q7)) value |= 1;
    digitalWrite(CP, HIGH);
    delayMicroseconds(5);
    digitalWrite(CP, LOW);
  }
  return value;
}

void write595(byte data) {
  digitalWrite(STCP, LOW);
  shiftOut(DS, SHCP, MSBFIRST, data);
  digitalWrite(STCP, HIGH);
}

void loop() {
  byte buttons = read165();      // Tombol aktif LOW
  byte leds = ~buttons;          // Supaya ditekan = LED nyala

  // Debug di Serial Monitor
  Serial.print("BTN: ");
  for (int i = 7; i >= 0; i--) Serial.print((buttons >> i) & 1);
  Serial.print("   LED: ");
  for (int i = 7; i >= 0; i--) Serial.print((leds >> i) & 1);
  Serial.println();

  write595(leds); // Output ke LED
  delay(200);
}