added arduino, modified build

arduino/libraries/Adafruit_Circuit_Playground/utility/IRLibRecvPCI.h

@@ -0,0 +1,35 @@
+/* IRLibRecvPCI.h 
+ * Part of IRLib Library for Arduino receiving, decoding, and sending
+ * infrared signals. See COPYRIGHT.txt and LICENSE.txt for more information.
+ *
+ * You should include this header in your sketch if you're using the IRLibRecvPCI
+ * receiver class which uses pin change interrupts to poll the input pin.
+ * This version gives more accurate results than the 50us timer based IRrecv but it has
+ * other limitations. It uses the Arduino "attachInterrupt()" function which can conflict
+ * with other libraries. Also unless you use an external buffer and enable auto resume
+ * this receiver occasionally fails to receive the second of 2 quickly sent frames.
+ * If you do not have sufficient RAM for a second buffer you should consider using the
+ * other two available receiver classes.
+ * Applications that do sending only SHOULD NOT include this header.  
+ *
+ * This receiver is based in part on Arduino firmware for use with AnalysIR IR signal analysis
+ * software for Windows PCs. Many thanks to the people at http://analysir.com for their 
+ * assistance in developing this section of code.
+ */
+
+#ifndef IRLibRecvPCI_h
+#define IRLibRecvPCI_h
+#include "IRLibRecvBase.h"
+
+class IRrecvPCI: public IRrecvBase {
+public:
+  IRrecvPCI(void){};  //Use only when receiver object is part of larger object. 
+                      // Still must initialize using constructor below.
+  IRrecvPCI(uint8_t pin);
+  void enableIRIn(void); //call to initialize or resume receiving
+  bool getResults(void); //returns true if new frame of data has been received
+  void disableIRIn(void); //ISR runs continuously once started. Use this if you want to stop.
+private:
+  uint8_t intrNum;
+};
+#endif //IRLibRecvPCI_h