// Week 11 — DFPlayer Mini on XIAO ESP32-C3 (UART)
// XIAO TX (D6) → DFPlayer RX
// XIAO RX (D7) ← DFPlayer TX
// Library: DFRobotDFPlayerMini

#include "DFRobotDFPlayerMini.h"
#include <HardwareSerial.h>

HardwareSerial dfSerial(1);

DFRobotDFPlayerMini dfPlayer;

void setup() {
  Serial.begin(115200);
  dfSerial.begin(9600, SERIAL_8N1, D7, D6);  // RX, TX

  Serial.println(F("DFPlayer init..."));
  if (!dfPlayer.begin(dfSerial)) {
    Serial.println(F("DFPlayer failed — check UART wiring and SD card"));
    while (1) delay(1000);
  }

  dfPlayer.volume(20);   // 0–30
  dfPlayer.play(1);      // play 0001.mp3 on SD card
  Serial.println(F("Playing track 001"));
}

void loop() {
  if (dfPlayer.readType() == DFPlayerPlayFinished) {
    Serial.println(F("Track finished"));
    delay(1000);
    dfPlayer.play(1);
  }
  delay(200);
}