fix: moved audio code to seperate module

FW/m5stack_audio/src/audio.cpp

@@ -0,0 +1,80 @@
+#include "audio.h"
+
+AudioGeneratorMP3 *mp3;
+AudioFileSourceID3 *id3;
+
+AudioFileSourceLittleFS *file;
+
+AudioOutputI2S *out;
+
+const char *waveFile = "/Let_it_be.mp3";
+
+// Called when a metadata event occurs (i.e. an ID3 tag, an ICY block, etc.
+void MDCallback(void *cbData, const char *type, bool isUnicode, const char *string)
+{
+  (void)cbData;
+  Serial.printf("ID3 callback for: %s = '", type);
+
+  if (isUnicode)
+  {
+    string += 2;
+  }
+
+  while (*string)
+  {
+    char a = *(string++);
+    if (isUnicode)
+    {
+      string++;
+    }
+    Serial.printf("%c", a);
+  }
+  Serial.printf("'\n");
+  Serial.flush();
+}
+
+// Called when there's a warning or error (like a buffer underflow or decode hiccup)
+void StatusCallback(void *cbData, int code, const char *string)
+{
+  const char *ptr = reinterpret_cast<const char *>(cbData);
+  // Note that the string may be in PROGMEM, so copy it to RAM for printf
+  char s1[64];
+  strncpy_P(s1, string, sizeof(s1));
+  s1[sizeof(s1)-1]=0;
+  Serial.printf("STATUS(%s) '%d' = '%s'\n", ptr, code, s1);
+  Serial.flush();
+}
+
+void initAudio()
+{
+
+
+  audioLogger = &Serial;
+  file = new AudioFileSourceLittleFS(waveFile);
+  id3 = new AudioFileSourceID3(file);
+  id3->RegisterMetadataCB(MDCallback, (void *)"ID3TAG");
+
+  mp3 = new AudioGeneratorMP3();
+  mp3->RegisterStatusCB(StatusCallback, (void*)"mp3");
+
+  out = new AudioOutputI2S();
+  out->SetPinout(19, 33, 22); //bclk, wclk, data
+  mp3->begin(id3, out);
+  out->SetGain(0.25);
+}
+
+void handleAudio()
+{
+  if (mp3->isRunning())
+  {
+    if (!mp3->loop())
+    {
+      mp3->stop();
+    }
+  }
+  else
+  {
+    Serial.printf("sound done\n");
+    delay(1000);
+  }
+}