diff --git a/audioooo/platformio.ini b/audioooo/platformio.ini
index 0d75a1c..d93d430 100644
--- a/audioooo/platformio.ini
+++ b/audioooo/platformio.ini
@@ -15,3 +15,5 @@ framework = arduino
 lib_deps =
   adafruit/Adafruit SSD1306@^2.4.5
   adafruit/Adafruit BusIO@^1.7.3
+  arkhipenko/TaskScheduler@^3.3.0
+upload_speed = 921600 ; 9600, 19200, 38400, 57600, 115200, 230400, 460800, 921600
diff --git a/audioooo/src/main.cpp b/audioooo/src/main.cpp
new file mode 100644
index 0000000..7e34db0
--- /dev/null
+++ b/audioooo/src/main.cpp
@@ -0,0 +1,475 @@
+//
+// wirelessly connected cloud (based on ESP-NOW, a kind of LPWAN?)
+//
+
+//
+// 0set performance 'Georidugi'/Distancing
+// @ 2021 Jun 15 ~ 17
+//
+
+//
+// 2021 june
+//
+// esp32 based sampler
+//
+
+//============<identities>============
+//
+#define MY_GROUP_ID   (10000)
+#define MY_ID         (MY_GROUP_ID + 1)
+#define MY_SIGN       ("AUDIOOOO")
+//
+//============</identities>============
+
+//==========<list-of-configurations>===========
+//
+// 'HAVE_CLIENT'
+// --> i have a client. enable the client task.
+//
+// 'DISABLE_AP'
+// --> (questioning)...
+//
+//==========</list-of-configurations>==========
+//
+#define DISABLE_AP
+
+//============<parameters>============
+//
+#define LED_PERIOD (11111)
+#define LED_ONTIME (1)
+#define LED_GAPTIME (222)
+//
+#define SCREEN_PERIOD (200) //200ms = 5hz
+//
+#define WIFI_CHANNEL 5
+//
+// 'MONITORING_SERIAL'
+//
+// --> sometimes, the 'Serial' is in use (for example, 'osc' node)
+//     then,      use 'Serial1' - D4/GPIO2/TDX1 @ nodemcu (this is TX only.)
+//
+// --> otherwise, MONITORING_SERIAL == Serial.
+//
+#if defined(SERIAL_SWAP)
+#define MONITORING_SERIAL (Serial1)
+#else
+#define MONITORING_SERIAL (Serial)
+#endif
+//
+//============</parameters>===========
+
+//============<board-specifics>============
+#if defined(ARDUINO_FEATHER_ESP32) // featheresp32
+#define LED_PIN 13
+#elif defined(ARDUINO_ESP32_DEV) // esp32dev (MakePython ESP32 => Have NO LED)
+#define LED_PIN 2
+#else
+#define LED_PIN 2
+#endif
+//============</board-specifics>===========
+
+//arduino
+#include <Arduino.h>
+
+//post & addresses
+#include "../../post.h"
+
+//espnow
+#include <esp_now.h>
+#include <WiFi.h>
+
+//task
+#include <TaskScheduler.h>
+Scheduler runner;
+
+//screen
+#include <Adafruit_GFX.h>
+#include <Adafruit_SSD1306.h>
+#define MAKEPYTHON_ESP32_SDA 4
+#define MAKEPYTHON_ESP32_SCL 5
+#define SCREEN_WIDTH 128 // OLED display width, in pixels
+#define SCREEN_HEIGHT 64 // OLED display height, in pixels
+#define OLED_RESET -1    // Reset pin # (or -1 if sharing Arduino reset pin)
+Adafruit_SSD1306 display(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, OLED_RESET);
+
+//-*-*-*-*-*-*-*-*-*-*-*-*-
+// my tasks
+// audio & sd & filesystem
+#include "Audio.h"
+#include "SPI.h"
+#include "SD.h"
+#include "FS.h"
+//sdcard
+#define SD_CS 22
+#define SPI_MOSI 23
+#define SPI_MISO 19
+#define SPI_SCK 18
+//digital i/o used (for) makerfabs audio v2.0
+#define I2S_DOUT 27
+#define I2S_BCLK 26
+#define I2S_LRC 25
+Audio audio;
+
+//screen task
+String screen_cmd = "(((..listening..)))";
+String screen_filename = "***.wav";
+
+//
+extern Task screen_cmd_notify_task;
+bool cmd_notify = false;
+void screen_cmd_notify() {
+  if (screen_cmd_notify_task.isFirstIteration()) cmd_notify = true;
+  else if (screen_cmd_notify_task.isLastIteration()) cmd_notify = false;
+  else cmd_notify = !cmd_notify;
+}
+Task screen_cmd_notify_task(500, 10, &screen_cmd_notify, &runner, true);
+
+//
+extern Task screen_task;
+void screen() {
+  //clear screen + a
+  int line_step = 12;
+  int line = 0;
+  display.clearDisplay();
+  display.setTextColor(SSD1306_WHITE);
+  display.setTextSize(1);
+
+  //line1 - mode line (playing / stopped) + notify mark
+  display.setCursor(0, line);
+  if (audio.isRunning()) display.println("= playing ===");
+  else display.println("* stopped !:.");
+  if (cmd_notify) {
+    display.setCursor(120, line);
+    display.println("*");
+  }
+  line += line_step;
+
+  //line2 - filename
+  display.setCursor(0, line);
+  display.println(screen_filename.c_str());
+  line += line_step;
+
+  //line3 - rf. last msg.
+  display.setCursor(0, line);
+  display.println(screen_cmd.c_str());
+  line += line_step;
+  //
+  display.display();
+  //
+}
+Task screen_task(SCREEN_PERIOD, TASK_FOREVER, &screen, &runner, true);
+
+//sample #
+int sample_now = 0; //0~999
+
+//on 'start'
+void sample_player_start()
+{
+  //filename buffer - 8.3 naming convension! 8+1+3+1 = 13
+  // + '/' root symbol 13+1 = 14 (ESP32 specific?)
+  char filename[14] = "/NNN.wav";
+  //search for the sound file
+  int note = sample_now;
+  int nnn = (note % 1000);  // 0~999
+  int nn =  (note % 100);   // 0~99
+  filename[1] = '0' + (nnn / 100); // N__.WAV
+  filename[2] = '0' + (nn / 10);   // _N_.WAV
+  filename[3] = '0' + (nn % 10);   // __N.WAV
+  //TEST
+  Serial.println(filename);
+  screen_filename = String(filename);
+  bool test = SD.exists(filename);
+  if (!test) {
+    Serial.println("... does not exist.");
+    screen_filename = screen_filename + "_!NEXIST!";
+    return;
+  }
+  //start the player!
+  audio.connecttoSD(filename);
+  delay(10);
+}
+Task sample_player_start_task(0, TASK_ONCE, &sample_player_start, &runner, false);
+
+//on 'stop'
+void sample_player_stop() {
+  //filename buffer - 8.3 naming convension! 8+1+3+1 = 13
+  // + '/' root symbol 13+1 = 14 (ESP32 specific?)
+  char filename[14] = "/NNN.wav";
+  //search for the sound file
+  int note = sample_now;
+  int nnn = (note % 1000);  // 0~999
+  int nn =  (note % 100);   // 0~99
+  filename[1] = '0' + (nnn / 100); // N__.WAV
+  filename[2] = '0' + (nn / 10);   // _N_.WAV
+  filename[3] = '0' + (nn % 10);   // __N.WAV
+  //TEST
+  Serial.println(filename);
+  screen_filename = String(filename);
+  bool test = SD.exists(filename);
+  if (!test) {
+    Serial.println("... does not exist.");
+    screen_filename = screen_filename + "_!NEXIST!";
+    return;
+  }
+  //stop the player.
+  audio.stopSong();
+}
+Task sample_player_stop_task(0, TASK_ONCE, &sample_player_stop, &runner, false);
+//*-*-*-*-*-*-*-*-*-*-*-*-*
+
+//
+extern Task hello_task;
+static int hello_delay = 0;
+void hello() {
+  //
+  byte mac[6];
+  WiFi.macAddress(mac);
+  uint32_t mac32 = (((((mac[2] << 8) + mac[3]) << 8) + mac[4]) << 8) + mac[5];
+  //
+  Hello hello(String(MY_SIGN), MY_ID, mac32); // the most basic 'hello'
+  // and you can append some floats
+  static int count = 0;
+  count++;
+  hello.h1 = (count % 1000);
+  hello.h2 = sample_now;
+  // hello.h3 = 0;
+  // hello.h4 = 0;
+  //
+  uint8_t frm_size = sizeof(Hello) + 2;
+  uint8_t frm[frm_size];
+  frm[0] = '{';
+  memcpy(frm + 1, (uint8_t *) &hello, sizeof(Hello));
+  frm[frm_size - 1] = '}';
+  //
+  esp_now_send(NULL, frm, frm_size); // to all peers in the list.
+  //
+  // MONITORING_SERIAL.write(frm, frm_size);
+  // MONITORING_SERIAL.println(" ==(esp_now_send/0)==> ");
+  //
+  if (hello_delay > 0) {
+    if (hello_delay < 100) hello_delay = 100;
+    hello_task.restartDelayed(hello_delay);
+  }
+}
+Task hello_task(0, TASK_ONCE, &hello, &runner, false);
+
+//task #0 : blink led
+extern Task blink_task;
+void blink() {
+  //
+  static int count = 0;
+  count++;
+  //
+  switch (count % 4) {
+  case 0:
+    digitalWrite(LED_PIN, LOW); // first ON
+    blink_task.delay(LED_ONTIME);
+    break;
+  case 1:
+    digitalWrite(LED_PIN, HIGH); // first OFF
+    blink_task.delay(LED_GAPTIME);
+    break;
+  case 2:
+    digitalWrite(LED_PIN, LOW); // second ON
+    blink_task.delay(LED_ONTIME);
+    break;
+  case 3:
+    digitalWrite(LED_PIN, HIGH); // second OFF
+    blink_task.delay(LED_PERIOD - 2* LED_ONTIME - LED_GAPTIME);
+    break;
+  }
+}
+Task blink_task(0, TASK_FOREVER, &blink, &runner, false); // makepython esp32 has NO led => disabled.
+
+// on 'Note'
+void onNoteHandler(Note & n) {
+  //is it for me?
+  if (n.id == MY_GROUP_ID || n.id == MY_ID) {
+    //
+    screen_cmd = n.to_string();
+    screen_cmd_notify_task.restart();
+    //
+    if (n.onoff == 1) {
+      sample_now = n.pitch;
+      sample_player_start_task.restartDelayed(10);
+    } else if (n.onoff == 0) {
+      sample_now = n.pitch;
+      sample_player_stop_task.restartDelayed(10);
+    }
+    //
+  }
+}
+
+// on 'receive'
+void onDataReceive(const uint8_t * mac, const uint8_t *incomingData, int32_t len) {
+
+  //
+  // MONITORING_SERIAL.write(incomingData, len);
+
+  //
+#if defined(HAVE_CLIENT)
+  Serial.write(incomingData, len); // we pass it over to the client.
+#endif
+
+  // open => identify => use.
+  if (incomingData[0] == '{' && incomingData[len - 1] == '}' && len == (sizeof(Hello) + 2)) {
+    Hello hello("");
+    memcpy((uint8_t *) &hello, incomingData + 1, sizeof(Hello));
+    //
+    MONITORING_SERIAL.println(hello.to_string());
+    //
+  }
+
+  // open => identify => use.
+  if (incomingData[0] == '[' && incomingData[len - 1] == ']' && len == (sizeof(Note) + 2)) {
+    Note note;
+    memcpy((uint8_t *) &note, incomingData + 1, sizeof(Note));
+    onNoteHandler(note);
+
+    //is it for me?
+    if (note.id == MY_GROUP_ID || note.id == MY_ID) {
+      hello_delay = note.ps;
+      if (hello_delay > 0 && hello_task.isEnabled() == false) {
+        hello_task.restart();
+      }
+    }
+
+    MONITORING_SERIAL.println(note.to_string());
+  }
+}
+
+// on 'sent'
+void onDataSent(const uint8_t *mac_addr, esp_now_send_status_t sendStatus) {
+  if (sendStatus != 0) MONITORING_SERIAL.println("Delivery failed!");
+}
+
+// SD TEST
+void printDirectory(File dir, int numTabs) {
+  // char filename[256] = "";
+  while(true) {
+    File entry =  dir.openNextFile();
+    if (!entry) {
+      // no more files
+      break;
+    }
+    for (uint8_t i=0; i<numTabs; i++) {
+      Serial.print('\t');
+    }
+    // entry.getName(filename, 256);
+    // Serial.print(filename);
+    Serial.print(entry.name());
+    if (entry.isDirectory()) {
+      Serial.println("/");
+      printDirectory(entry, numTabs+1);
+    } else {
+      // files have sizes, directories do not
+      Serial.print("\t\t");
+      Serial.println(entry.size(), DEC);
+    }
+    entry.close();
+  }
+}
+
+//
+File root;
+void setup() {
+
+  //led
+  pinMode(LED_PIN, OUTPUT);
+
+  //serial
+  Serial.begin(115200);
+  delay(100);
+
+  //screen
+  Wire.begin(MAKEPYTHON_ESP32_SDA, MAKEPYTHON_ESP32_SCL);
+  // SSD1306_SWITCHCAPVCC = generate display voltage from 3.3V internally
+  if (!display.begin(SSD1306_SWITCHCAPVCC, 0x3C)) { // Address 0x3C for 128x32
+    Serial.println(F("SSD1306 allocation failed"));
+    for (;;)
+      ;         // Don't proceed, loop forever
+  }
+  display.clearDisplay();
+
+  //SD(SPI)
+  pinMode(SD_CS, OUTPUT);
+  digitalWrite(SD_CS, HIGH);
+  SPI.begin(SPI_SCK, SPI_MISO, SPI_MOSI);
+  SPI.setFrequency(1000000);
+  if (!SD.begin(SD_CS, SPI)) {
+    Serial.println("Card Mount Failed");
+    // lcd_text("SD ERR");
+    while (1)
+      ;
+  } else {
+    // lcd_text("SD OK");
+  }
+  root = SD.open("/");
+  printDirectory(root, 0);
+
+  //audio(I2S)
+  audio.setPinout(I2S_BCLK, I2S_LRC, I2S_DOUT);
+  audio.setVolume(21);   // 0...21
+  // audio.connecttoFS(SD, filename.c_str());
+
+  //info
+  Serial.println();
+  Serial.println();
+  Serial.println("\"hi, i m your postman.\"");
+  Serial.println("-");
+  Serial.println("- my id: " + String(MY_ID) + ", gid: " + String(MY_GROUP_ID) + ", call me ==> \"" + String(MY_SIGN) + "\"");
+  Serial.println("- mac address: " + WiFi.macAddress() + ", channel: " + String(WIFI_CHANNEL));
+#if defined(HAVE_CLIENT)
+  Serial.println("- ======== 'HAVE_CLIENT' ========");
+#endif
+#if defined(SERIAL_SWAP)
+  Serial.println("- ======== 'SERIAL_SWAP' ========");
+#endif
+#if defined(DISABLE_AP)
+  Serial.println("- ======== 'DISABLE_AP' ========");
+#endif
+#if defined(HAVE_CLIENT_I2C)
+  Serial.println("- ======== 'HAVE_CLIENT_I2C' ========");
+#endif
+  Serial.println("-");
+
+  //wifi
+  WiFiMode_t node_type = WIFI_AP_STA;
+#if defined(DISABLE_AP)
+  // system_phy_set_max_tpw(0);
+  WiFi.setTxPower(WIFI_POWER_MINUS_1dBm); // Set WiFi RF power output to lowest level
+  node_type = WIFI_STA;
+#endif
+  WiFi.mode(node_type);
+
+  //esp-now
+  if (esp_now_init() != 0) {
+    Serial.println("Error initializing ESP-NOW");
+    return;
+  }
+  esp_now_register_send_cb(onDataSent);
+  esp_now_register_recv_cb(onDataReceive);
+  //
+  Serial.println("- ! (esp_now_add_peer) ==> add a 'broadcast peer' (FF:FF:FF:FF:FF:FF).");
+  uint8_t broadcastmac[6] = {0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF};
+
+  //
+  esp_now_peer_info_t peerInfo;
+  memcpy(peerInfo.peer_addr, broadcastmac, 6);
+  peerInfo.channel = 0;
+  peerInfo.encrypt = false;
+  esp_now_add_peer(&peerInfo);
+
+  //
+  Serial.println("-");
+  Serial.println("\".-.-.-. :)\"");
+  Serial.println();
+}
+
+void loop() {
+  //
+  audio.loop();
+  //
+  runner.execute();
+  //
+}
diff --git a/audioooo/src/main.ino b/audioooo/src/main.ino
deleted file mode 100644
index 0183fba..0000000
--- a/audioooo/src/main.ino
+++ /dev/null
@@ -1,434 +0,0 @@
-#include "Arduino.h"
-//#include "WiFiMulti.h"
-#include "Audio.h"
-#include "SPI.h"
-#include "SD.h"
-#include "FS.h"
-#include <Adafruit_GFX.h>
-#include <Adafruit_SSD1306.h>
-
-//SD Card
-#define SD_CS 22
-#define SPI_MOSI 23
-#define SPI_MISO 19
-#define SPI_SCK 18
-
-//Digital I/O used  //Makerfabs Audio V2.0
-#define I2S_DOUT 27
-#define I2S_BCLK 26
-#define I2S_LRC 25
-
-//SSD1306
-#define MAKEPYTHON_ESP32_SDA 4
-#define MAKEPYTHON_ESP32_SCL 5
-#define SCREEN_WIDTH 128 // OLED display width, in pixels
-#define SCREEN_HEIGHT 64 // OLED display height, in pixels
-#define OLED_RESET -1    // Reset pin # (or -1 if sharing Arduino reset pin)
-
-Adafruit_SSD1306 display(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, OLED_RESET);
-
-//Button
-const int Pin_vol_up = 39;
-const int Pin_vol_down = 36;
-const int Pin_mute = 35;
-
-const int Pin_previous = 15;
-const int Pin_pause = 33;
-const int Pin_next = 2;
-
-Audio audio;
-
-/*
-   WiFiMulti wifiMulti;
-   String ssid = "Makerfabs";
-   String password = "20160704";
- */
-
-struct Music_info
-{
-  String name;
-  int length;
-  int runtime;
-  int volume;
-  int status;
-  int mute_volume;
-} music_info = {"", 0, 0, 0, 0, 0};
-
-String file_list[20];
-int file_num = 0;
-int file_index = 0;
-
-int get_music_list(fs::FS &fs, const char *dirname, uint8_t levels, String wavlist[30]);
-
-void setup()
-{
-  //IO mode init
-  pinMode(Pin_vol_up, INPUT_PULLUP);
-  pinMode(Pin_vol_down, INPUT_PULLUP);
-  pinMode(Pin_mute, INPUT_PULLUP);
-  pinMode(Pin_previous, INPUT_PULLUP);
-  pinMode(Pin_pause, INPUT_PULLUP);
-  pinMode(Pin_next, INPUT_PULLUP);
-
-  //Serial
-  Serial.begin(115200);
-
-  //LCD
-  Wire.begin(MAKEPYTHON_ESP32_SDA, MAKEPYTHON_ESP32_SCL);
-  // SSD1306_SWITCHCAPVCC = generate display voltage from 3.3V internally
-  if (!display.begin(SSD1306_SWITCHCAPVCC, 0x3C))
-  {   // Address 0x3C for 128x32
-    Serial.println(F("SSD1306 allocation failed"));
-    for (;;)
-      ;       // Don't proceed, loop forever
-  }
-  display.clearDisplay();
-  logoshow();
-
-  //SD(SPI)
-  pinMode(SD_CS, OUTPUT);
-  digitalWrite(SD_CS, HIGH);
-  SPI.begin(SPI_SCK, SPI_MISO, SPI_MOSI);
-  SPI.setFrequency(1000000);
-  if (!SD.begin(SD_CS, SPI))
-  {
-    Serial.println("Card Mount Failed");
-    lcd_text("SD ERR");
-    while (1)
-      ;
-  }
-  else
-  {
-    lcd_text("SD OK");
-  }
-
-  //Read SD
-  file_num = get_music_list(SD, "/", 0, file_list);
-  Serial.print("Music file count:");
-  Serial.println(file_num);
-  Serial.println("All music:");
-  for (int i = 0; i < file_num; i++)
-  {
-    Serial.println(file_list[i]);
-  }
-
-  //WiFi
-  /*
-     WiFi.mode(WIFI_STA);
-     wifiMulti.addAP(ssid.c_str(), password.c_str());
-     wifiMulti.run();
-     if (WiFi.status() != WL_CONNECTED)
-     {
-      WiFi.disconnect(true);
-      wifiMulti.run();
-     }
-   */
-
-  //Audio(I2S)
-  audio.setPinout(I2S_BCLK, I2S_LRC, I2S_DOUT);
-  audio.setVolume(21);   // 0...21
-
-  //audio.connecttoFS(SD, "/MoonlightBay.mp3"); //ChildhoodMemory.mp3  //MoonRiver.mp3 //320k_test.mp3
-  //file_list[0] = "MoonlightBay.mp3";
-  open_new_song(file_list[file_index]);
-  print_song_time();
-}
-
-uint run_time = 0;
-uint button_time = 0;
-
-void loop()
-{
-  audio.loop();
-  if (millis() - run_time > 1000)
-  {
-    run_time = millis();
-    print_song_time();
-    display_music();
-  }
-
-  if (millis() - button_time > 300)
-  {
-    //Button logic
-    if (digitalRead(Pin_next) == 0)
-    {
-      Serial.println("Pin_next");
-      if (file_index < file_num - 1)
-        file_index++;
-      else
-        file_index = 0;
-      open_new_song(file_list[file_index]);
-      print_song_time();
-      button_time = millis();
-    }
-    if (digitalRead(Pin_previous) == 0)
-    {
-      Serial.println("Pin_previous");
-      if (file_index > 0)
-        file_index--;
-      else
-        file_index = file_num - 1;
-      open_new_song(file_list[file_index]);
-      print_song_time();
-      button_time = millis();
-    }
-    if (digitalRead(Pin_vol_up) == 0)
-    {
-      Serial.println("Pin_vol_up");
-      if (music_info.volume < 21)
-        music_info.volume++;
-      audio.setVolume(music_info.volume);
-      button_time = millis();
-    }
-    if (digitalRead(Pin_vol_down) == 0)
-    {
-      Serial.println("Pin_vol_down");
-      if (music_info.volume > 0)
-        music_info.volume--;
-      audio.setVolume(music_info.volume);
-      button_time = millis();
-    }
-    if (digitalRead(Pin_mute) == 0)
-    {
-      Serial.println("Pin_mute");
-      if (music_info.volume != 0)
-      {
-        music_info.mute_volume = music_info.volume;
-        music_info.volume = 0;
-      }
-      else
-      {
-        music_info.volume = music_info.mute_volume;
-      }
-      audio.setVolume(music_info.volume);
-      button_time = millis();
-    }
-    if (digitalRead(Pin_pause) == 0)
-    {
-      Serial.println("Pin_pause");
-      audio.pauseResume();
-      button_time = millis();
-    }
-  }
-
-  //串口控制切歌，音量
-  if (Serial.available())
-  {
-    String r = Serial.readString();
-    r.trim();
-    if (r.length() > 5)
-    {
-      audio.stopSong();
-      open_new_song(file_list[0]);
-      print_song_info();
-    }
-    else
-    {
-      audio.setVolume(r.toInt());
-    }
-  }
-}
-
-void open_new_song(String filename)
-{
-  //去掉文件名的根目录"/"和文件后缀".mp3",".wav"
-  music_info.name = filename.substring(1, filename.indexOf("."));
-  audio.connecttoFS(SD, filename.c_str());
-  music_info.runtime = audio.getAudioCurrentTime();
-  music_info.length = audio.getAudioFileDuration();
-  music_info.volume = audio.getVolume();
-  music_info.status = 1;
-  Serial.println("**********start a new sound************");
-}
-
-void display_music()
-{
-  int line_step = 24;
-  int line = 0;
-  char buff[20];
-  ;
-  sprintf(buff, "%d:%d", music_info.runtime, music_info.length);
-
-  display.clearDisplay();
-
-  display.setTextSize(2);                // Normal 1:1 pixel scale
-  display.setTextColor(SSD1306_WHITE);   // Draw white text
-
-  display.setCursor(0, line);   // Start at top-left corner
-  display.println(music_info.name);
-  line += line_step;
-
-  display.setCursor(0, line);
-  display.println(buff);
-  line += line_step;
-
-  sprintf(buff, "V:%d",music_info.volume);
-
-  display.setCursor(0, line);
-  display.println(buff);
-  line += line_step;
-
-  display.setCursor(0, line);
-  display.println(music_info.status);
-  line += line_step;
-
-  display.display();
-}
-
-void logoshow(void)
-{
-  display.clearDisplay();
-
-  display.setTextSize(2);                // Normal 1:1 pixel scale
-  display.setTextColor(SSD1306_WHITE);   // Draw white text
-  display.setCursor(0, 0);               // Start at top-left corner
-  display.println(F("MakePython"));
-  display.setCursor(0, 20);   // Start at top-left corner
-  display.println(F("MUSIC"));
-  display.setCursor(0, 40);   // Start at top-left corner
-  display.println(F("PLAYER V2"));
-  display.display();
-  delay(2000);
-}
-
-void lcd_text(String text)
-{
-  display.clearDisplay();
-
-  display.setTextSize(2);                // Normal 1:1 pixel scale
-  display.setTextColor(SSD1306_WHITE);   // Draw white text
-  display.setCursor(0, 0);               // Start at top-left corner
-  display.println(text);
-  display.display();
-  delay(500);
-}
-
-void print_song_info()
-{
-  Serial.println("***********************************");
-  Serial.println(audio.getFileSize());
-  Serial.println(audio.getFilePos());
-  Serial.println(audio.getSampleRate());
-  Serial.println(audio.getBitsPerSample());
-  Serial.println(audio.getChannels());
-  Serial.println(audio.getVolume());
-  Serial.println("***********************************");
-}
-
-//刷新歌曲时间
-void print_song_time()
-{
-  //Serial.println(audio.getAudioCurrentTime());
-  //Serial.println(audio.getAudioFileDuration());
-  music_info.runtime = audio.getAudioCurrentTime();
-  music_info.length = audio.getAudioFileDuration();
-  music_info.volume = audio.getVolume();
-}
-
-int get_music_list(fs::FS &fs, const char *dirname, uint8_t levels, String wavlist[30])
-{
-  Serial.printf("Listing directory: %s\n", dirname);
-  int i = 0;
-
-  File root = fs.open(dirname);
-  if (!root)
-  {
-    Serial.println("Failed to open directory");
-    return i;
-  }
-  if (!root.isDirectory())
-  {
-    Serial.println("Not a directory");
-    return i;
-  }
-
-  File file = root.openNextFile();
-  while (file)
-  {
-    if (file.isDirectory())
-    {
-    }
-    else
-    {
-      String temp = file.name();
-      if (temp.endsWith(".wav"))
-      {
-        wavlist[i] = temp;
-        i++;
-      }
-      else if (temp.endsWith(".mp3"))
-      {
-        wavlist[i] = temp;
-        i++;
-      }
-    }
-    file = root.openNextFile();
-  }
-  return i;
-}
-
-//**********************************************
-// optional
-void audio_info(const char *info)
-{
-  Serial.print("info        ");
-  Serial.println(info);
-}
-void audio_id3data(const char *info)
-{ //id3 metadata
-  Serial.print("id3data     ");
-  Serial.println(info);
-}
-
-//歌曲结束逻辑
-void audio_eof_mp3(const char *info)
-{ //end of file
-  Serial.print("eof_mp3     ");
-  Serial.println(info);
-  file_index++;
-  if (file_index >= file_num)
-  {
-    file_index = 0;
-  }
-  open_new_song(file_list[file_index]);
-}
-void audio_showstation(const char *info)
-{
-  Serial.print("station     ");
-  Serial.println(info);
-}
-void audio_showstreaminfo(const char *info)
-{
-  Serial.print("streaminfo  ");
-  Serial.println(info);
-}
-void audio_showstreamtitle(const char *info)
-{
-  Serial.print("streamtitle ");
-  Serial.println(info);
-}
-void audio_bitrate(const char *info)
-{
-  Serial.print("bitrate     ");
-  Serial.println(info);
-}
-void audio_commercial(const char *info)
-{ //duration in sec
-  Serial.print("commercial  ");
-  Serial.println(info);
-}
-void audio_icyurl(const char *info)
-{ //homepage
-  Serial.print("icyurl      ");
-  Serial.println(info);
-}
-void audio_lasthost(const char *info)
-{ //stream URL played
-  Serial.print("lasthost    ");
-  Serial.println(info);
-}
-void audio_eof_speech(const char *info)
-{
-  Serial.print("eof_speech  ");
-  Serial.println(info);
-}