Limit library to ATmega328 based boards.

dilshan · dilshan · commit 55400fdd0371 · 2019-05-09T09:16:05.000+05:30
diff --git a/dtmfgen.h b/dtmfgen.h
@@ -22,6 +22,10 @@
 #ifndef DTMF_GENERATOR_H
 #define DTMF_GENERATOR_H
 
+#if !defined(__AVR_ATmega328P__)
+  #error Unsupported board. This library support ATmega328P based Arduino Uno boards only.	
+#endif
+
 class DTMFGenerator
 {
   public:
