added arduino, modified build

arduino/libraries/Adafruit_Circuit_Playground/utility/Adafruit_CPlay_Mic.h

@@ -0,0 +1,41 @@
+// Adafruit Circuit Playground microphone library
+// by Phil Burgess / Paint Your Dragon.
+// Fast Fourier transform section is derived from
+// ELM-ChaN FFT library (see comments in ffft.S).
+
+#ifndef ADAFRUIT_CPLAY_MIC_H
+#define ADAFRUIT_CPLAY_MIC_H
+
+#ifdef __GNUC__
+  #define DEPRECATED(func) func __attribute__ ((deprecated))
+#elif defined(_MSC_VER)
+  #define DEPRECATED(func) __declspec(deprecated) func
+#else
+  #pragma message("WARNING: You need to implement DEPRECATED for this compiler")
+  #define DEPRECATED(func) func
+#endif
+
+#include "Adafruit_ZeroPDM.h"
+
+
+/**************************************************************************/
+/*! 
+    @brief  Class that stores state and functions for the microphone on CircuitPlayground boards
+*/
+/**************************************************************************/
+class Adafruit_CPlay_Mic {
+ public:
+  Adafruit_CPlay_Mic(void) {}; // Empty constructor
+  int  peak(uint16_t ms)  __attribute__ ((deprecated));
+  void capture(int16_t *buf, uint16_t nSamples),
+       fft(uint16_t *spectrum);
+
+  float soundPressureLevel(uint16_t ms);
+
+private:
+#if defined(ARDUINO_ARCH_SAMD)
+  static Adafruit_ZeroPDM pdm;
+#endif
+};
+
+#endif // ADAFRUIT_CPLAY_MIC_H