/*
  ESP32 SD I2S Music Player
  esp32-i2s-sd-player.ino
  Plays MP3 file from microSD card
  Uses MAX98357 I2S Amplifier Module
  Uses ESP32-audioI2S Library - https://github.com/schreibfaul1/ESP32-audioI2S

  DroneBot Workshop 2022
  https://dronebotworkshop.com

  https://github.com/schreibfaul1/ESP32-audioI2S/wiki
  https://dronebotworkshop.com/esp32-i2s/
  https://randomnerdtutorials.com/esp32-deep-sleep-arduino-ide-wake-up-sources/

  https://garrysblog.com/2023/05/03/calculating-bitmask-value-for-esp32-external-wake-up-google-is-your-friend/
  https://www.youtube.com/watch?v=-dW4XsBo3Mk

  https://garrysblog.com/2020/07/05/using-the-ds3231-real-time-clock-alarm-with-the-adafruit-rtclib-library/



*/

// Include required libraries
#include "Arduino.h"
#include "Audio.h"
#include "SD.h"
#include "FS.h"

// microSD Card Reader connections
#define SD_CS          5
#define SPI_MOSI      23
#define SPI_MISO      19
#define SPI_SCK       18

// I2S Connections
#define I2S_DOUT      22
#define I2S_BCLK      26
#define I2S_LRC       25

// Create Audio object
Audio audio;


//========================================================
#define uS_TO_S_FACTOR 1000000ULL  /* Conversion factor for micro seconds to seconds */
#define TIME_TO_SLEEP  5        /* Time ESP32 will go to sleep (in seconds) */

RTC_DATA_ATTR int bootCount = 0;

/*
  Method to print the reason by which ESP32
  has been awaken from sleep
*/
void print_wakeup_reason() {
  esp_sleep_wakeup_cause_t wakeup_reason;

  wakeup_reason = esp_sleep_get_wakeup_cause();

  switch (wakeup_reason)
  {
    case ESP_SLEEP_WAKEUP_EXT0 : Serial.println("Wakeup caused by external signal using RTC_IO"); break;
    case ESP_SLEEP_WAKEUP_EXT1 : Serial.println("Wakeup caused by external signal using RTC_CNTL"); break;
    case ESP_SLEEP_WAKEUP_TIMER : Serial.println("Wakeup caused by timer"); break;
    case ESP_SLEEP_WAKEUP_TOUCHPAD : Serial.println("Wakeup caused by touchpad"); break;
    case ESP_SLEEP_WAKEUP_ULP : Serial.println("Wakeup caused by ULP program"); break;
    default : Serial.printf("Wakeup was not caused by deep sleep: %d\n", wakeup_reason); break;
  }
}
//==================================================================

void setup() {

  // Set microSD Card CS as OUTPUT and set HIGH
  pinMode(SD_CS, OUTPUT);
  digitalWrite(SD_CS, HIGH);

  // Initialize SPI bus for microSD Card
  SPI.begin(SPI_SCK, SPI_MISO, SPI_MOSI);

  // Start Serial Port
  Serial.begin(115200);

  //=================================================================
  //Increment boot number and print it every reboot
  ++bootCount;
  Serial.println("Boot number: " + String(bootCount));

  //Print the wakeup reason for ESP32
  print_wakeup_reason();

  /*
    First we configure the wake up source
    We set our ESP32 to wake up every 5 seconds
  */
  esp_sleep_enable_timer_wakeup(TIME_TO_SLEEP * uS_TO_S_FACTOR);
  Serial.println("Setup ESP32 to sleep for every " + String(TIME_TO_SLEEP) +
                 " Seconds");

  //=====================================================================

  // Start microSD Card
  if (!SD.begin(SD_CS))
  {
    Serial.println("Error accessing microSD card!");
    while (true);
  }

  // Setup I2S
  audio.setPinout(I2S_BCLK, I2S_LRC, I2S_DOUT);

  // Set Volume
  audio.setVolume(21);

  // Open music file
  audio.connecttoFS(SD, "/MYMUSIC.mp3");

}

void loop()
{

  audio.loop();
}

void audio_eof_mp3(const char *info) { //end of file
  Serial.println("Going to sleep now");
  Serial.flush();
  esp_deep_sleep_start();
}