First release - test multiple UART

vscode/singing_picture/.gitignore

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+.pio
+.vscode/.browse.c_cpp.db*
+.vscode/c_cpp_properties.json
+.vscode/launch.json
+.vscode/ipch

vscode/singing_picture/.vscode/extensions.json

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+{
+    // See http://go.microsoft.com/fwlink/?LinkId=827846
+    // for the documentation about the extensions.json format
+    "recommendations": [
+        "platformio.platformio-ide"
+    ],
+    "unwantedRecommendations": [
+        "ms-vscode.cpptools-extension-pack"
+    ]
+}

vscode/singing_picture/include/README

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+
+This directory is intended for project header files.
+
+A header file is a file containing C declarations and macro definitions
+to be shared between several project source files. You request the use of a
+header file in your project source file (C, C++, etc) located in `src` folder
+by including it, with the C preprocessing directive `#include'.
+
+```src/main.c
+
+#include "header.h"
+
+int main (void)
+{
+ ...
+}
+```
+
+Including a header file produces the same results as copying the header file
+into each source file that needs it. Such copying would be time-consuming
+and error-prone. With a header file, the related declarations appear
+in only one place. If they need to be changed, they can be changed in one
+place, and programs that include the header file will automatically use the
+new version when next recompiled. The header file eliminates the labor of
+finding and changing all the copies as well as the risk that a failure to
+find one copy will result in inconsistencies within a program.
+
+In C, the usual convention is to give header files names that end with `.h'.
+It is most portable to use only letters, digits, dashes, and underscores in
+header file names, and at most one dot.
+
+Read more about using header files in official GCC documentation:
+
+* Include Syntax
+* Include Operation
+* Once-Only Headers
+* Computed Includes
+
+https://gcc.gnu.org/onlinedocs/cpp/Header-Files.html

vscode/singing_picture/lib/README

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+
+This directory is intended for project specific (private) libraries.
+PlatformIO will compile them to static libraries and link into executable file.
+
+The source code of each library should be placed in a an own separate directory
+("lib/your_library_name/[here are source files]").
+
+For example, see a structure of the following two libraries `Foo` and `Bar`:
+
+|--lib
+|  |
+|  |--Bar
+|  |  |--docs
+|  |  |--examples
+|  |  |--src
+|  |     |- Bar.c
+|  |     |- Bar.h
+|  |  |- library.json (optional, custom build options, etc) https://docs.platformio.org/page/librarymanager/config.html
+|  |
+|  |--Foo
+|  |  |- Foo.c
+|  |  |- Foo.h
+|  |
+|  |- README --> THIS FILE
+|
+|- platformio.ini
+|--src
+   |- main.c
+
+and a contents of `src/main.c`:
+```
+#include <Foo.h>
+#include <Bar.h>
+
+int main (void)
+{
+  ...
+}
+
+```
+
+PlatformIO Library Dependency Finder will find automatically dependent
+libraries scanning project source files.
+
+More information about PlatformIO Library Dependency Finder
+- https://docs.platformio.org/page/librarymanager/ldf.html

vscode/singing_picture/platformio.ini

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+; PlatformIO Project Configuration File
+;
+;   Build options: build flags, source filter
+;   Upload options: custom upload port, speed and extra flags
+;   Library options: dependencies, extra library storages
+;   Advanced options: extra scripting
+;
+; Please visit documentation for the other options and examples
+; https://docs.platformio.org/page/projectconf.html
+
+[env:lolin32]
+platform = espressif32
+board = lolin32
+framework = arduino
+monitor_speed = 115200
+lib_deps = 
+	dfrobot/DFRobotDFPlayerMini@^1.0.5
+	plerup/EspSoftwareSerial@^6.15.2
+board_build.f_cpu = 80000000L

vscode/singing_picture/src/main.cpp

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+
+#include "Arduino.h"
+#include "DFRobotDFPlayerMini.h"
+#include "SoftwareSerial.h"
+
+#define BUTTON D1
+
+
+SoftwareSerial mySoftSer_1(13, 12); // RX, TX
+SoftwareSerial mySoftSer_2(14, 27);
+
+DFRobotDFPlayerMini child_1;
+DFRobotDFPlayerMini child_2;
+
+void setup() {
+
+  Serial.begin(115200);     // start serial interface
+
+ if (!child_1.begin(mySoftSer_1, false)) {  //Use softwareSerial to communicate with mp3.
+    Serial.println(F("Unable to begin Child 1:"));
+    Serial.println(F("1.Please recheck the connection!"));
+    Serial.println(F("2.Please insert the SD card!"));
+    while(true){
+      delay(0); // Code to compatible with ESP8266 watch dog.
+    }
+  }
+  Serial.println(F("Child 1 online."));
+  child_1.volume(10);  //Set volume value. From 0 to 30
+
+  if (!child_2.begin(mySoftSer_2, false)) {  //Use softwareSerial to communicate with mp3.
+    Serial.println(F("Unable to begin Child 2:"));
+    Serial.println(F("1.Please recheck the connection!"));
+    Serial.println(F("2.Please insert the SD card!"));
+    while(true){
+      delay(0); // Code to compatible with ESP8266 watch dog.
+    }
+  }
+  Serial.println(F("Child 2 online."));
+  child_2.volume(10);  //Set volume value. From 0 to 30
+
+  //WiFi.mode(WIFI_OFF);
+  //WiFi.forceSleepBegin();
+  delay(10);
+
+ 
+}
+
+void loop() 
+{
+  child_1.play(1);  //Play the first mp3
+  child_1.readState()
+  delay(1000);  
+
+}

vscode/singing_picture/test/README

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+
+This directory is intended for PlatformIO Unit Testing and project tests.
+
+Unit Testing is a software testing method by which individual units of
+source code, sets of one or more MCU program modules together with associated
+control data, usage procedures, and operating procedures, are tested to
+determine whether they are fit for use. Unit testing finds problems early
+in the development cycle.
+
+More information about PlatformIO Unit Testing:
+- https://docs.platformio.org/page/plus/unit-testing.html