Add m5core2 audio (working)

FW/m5stack_audio/src/main.cpp

@@ -0,0 +1,56 @@
+#pragma mark - Depend ESP8266Audio and ESP8266_Spiram libraries
+/* 
+cd ~/Arduino/libraries
+git clone https://github.com/earlephilhower/ESP8266Audio
+git clone https://github.com/Gianbacchio/ESP8266_Spiram
+*/
+
+
+#include <M5Core2.h>
+#include <driver/i2s.h>
+#include <WiFi.h>
+#include "AudioFileSourceSD.h"
+#include "AudioFileSourceID3.h"
+#include "AudioGeneratorMP3.h"
+#include "AudioOutputI2S.h"
+
+
+AudioGeneratorMP3 *mp3;
+AudioFileSourceSD *file;
+AudioOutputI2S *out;
+AudioFileSourceID3 *id3;
+
+#define OUTPUT_GAIN 30
+
+void setup()
+{
+  M5.begin();
+  M5.Axp.SetSpkEnable(true);
+
+  WiFi.mode(WIFI_OFF); 
+  delay(500);
+  
+  M5.Lcd.setTextFont(2);
+  M5.Lcd.printf("Sample MP3 playback begins...\n");
+  Serial.printf("Sample MP3 playback begins...\n");
+
+  // pno_cs from https://ccrma.stanford.edu/~jos/pasp/Sound_Examples.html
+  file = new AudioFileSourceSD("/003.mp3");
+  id3 = new AudioFileSourceID3(file);
+  out = new AudioOutputI2S(0, 0); // Output to builtInDAC
+  out->SetPinout(12, 0, 2);
+  out->SetOutputModeMono(true);
+  out->SetGain((float)OUTPUT_GAIN/100.0);
+  mp3 = new AudioGeneratorMP3();
+  mp3->begin(id3, out);
+}
+
+void loop()
+{
+  if (mp3->isRunning()) {
+    if (!mp3->loop()) mp3->stop();
+  } else {
+    Serial.printf("MP3 done\n");
+    delay(1000);
+  }
+}