ESP8266上的音频播放模块无法初始化

我有ESP8266（ESP-12-E）和DFPlayer Mini

我正在运行示例应用程序：

#include "Arduino.h"
#include "SoftwareSerial.h"
#include "DFRobotDFPlayerMini.h"

SoftwareSerial mySoftwareSerial(2, 5); // RX, TX
DFRobotDFPlayerMini myDFPlayer;
void printDetail(uint8_t type, int value);

void setup()
{
  mySoftwareSerial.begin(9600);
  Serial.begin(115200);

  Serial.println();
  Serial.println(F("DFRobot DFPlayer Mini Demo"));
  Serial.println(F("Initializing DFPlayer ... (May take 3~5 seconds)"));

  if (!myDFPlayer.begin(mySoftwareSerial)) {  //Use softwareSerial to communicate with mp3.
    Serial.println(F("Unable to begin:"));
    Serial.println(F("1.Please recheck the connection!"));
    Serial.println(F("2.Please insert the SD card!"));
    while(true);
  }
  Serial.println(F("DFPlayer Mini online."));

  myDFPlayer.volume(10);  //Set volume value. From 0 to 30
  myDFPlayer.play(1);  //Play the first mp3
}

void loop()
{
  static unsigned long timer = millis();

  if (millis() - timer > 3000) {
    timer = millis();
    myDFPlayer.next();  //Play next mp3 every 3 second.
  }

  if (myDFPlayer.available()) {
    printDetail(myDFPlayer.readType(), myDFPlayer.read()); //Print the detail message from DFPlayer to handle different errors and states.
  }
}

void printDetail(uint8_t type, int value){
  switch (type) {
    case TimeOut:
      Serial.println(F("Time Out!"));
      break;
    case WrongStack:
      Serial.println(F("Stack Wrong!"));
      break;
    case DFPlayerCardInserted:
      Serial.println(F("Card Inserted!"));
      break;
    case DFPlayerCardRemoved:
      Serial.println(F("Card Removed!"));
      break;
    case DFPlayerCardOnline:
      Serial.println(F("Card Online!"));
      break;
    case DFPlayerPlayFinished:
      Serial.print(F("Number:"));
      Serial.print(value);
      Serial.println(F(" Play Finished!"));
      break;
    case DFPlayerError:
      Serial.print(F("DFPlayerError:"));
      switch (value) {
        case Busy:
          Serial.println(F("Card not found"));
          break;
        case Sleeping:
          Serial.println(F("Sleeping"));
          break;
        case SerialWrongStack:
          Serial.println(F("Get Wrong Stack"));
          break;
        case CheckSumNotMatch:
          Serial.println(F("Check Sum Not Match"));
          break;
        case FileIndexOut:
          Serial.println(F("File Index Out of Bound"));
          break;
        case FileMismatch:
          Serial.println(F("Cannot Find File"));
          break;
        case Advertise:
          Serial.println(F("In Advertise"));
          break;
        default:
          break;
      }
      break;
    default:
      break;
  }
}

我在主板1-8左侧的DFPlayer Mini上设置了以下引脚设置：

1 - +5v
2 - ESP-12-E GPIO 2 - Software serial TX
3 - ESP-12-E GPIO 5 - Software serial RX
4 - 
5 - 
6 - Speaker +
7 - GND
8 - Speaker -

串行监视器显示：

DFRobot DFPlayer迷你演示初始化DFPlayer ...（可能需要3~5秒）无法开始：1 . 请重新检查连接！ 2.请插入SD卡！软WDT复位ctx：cont sp：3ffefc30 end：3ffefe10 offset：01b0 stack >>> 3ffefde0：3ffeeab0 3ffeea88 3ffeed2c 402020c4 3ffefdf0：3fffdad0 00000000 3ffeeddc 40202fc4 3ffefe00：feefeffe feefeffe 3ffeedf0 40100710 << ets 2013年1月8日，第一个原因：2，开机模式：（3,6）

堆栈跟踪格式为：

Decoding 3 results
0x402020c4: setup at /Users/user/Documents/Arduino/dfplayer_simple/dfplayer_simple.ino line 42
0x40202fc4: loop_wrapper at /Users/user/Library/Arduino15/packages/esp8266/hardware/esp8266/2.4.0/cores/esp8266/core_esp8266_main.cpp line 57
0x40100710: cont_norm at /Users/user/Library/Arduino15/packages/esp8266/hardware/esp8266/2.4.0/cores/esp8266/cont.S line 109

我发现DFPlayer Mini LED上没有任何活动，我不确定从何处开始 .