define data and clock pins in one object then pass that as one argument to 2-wire objects

Dependents:   Nucleo_read_button_interrupt_copy Seeed_Grove_4_Digit_Display_Clock

Revision:
1:a288ae0fdd74
Parent:
0:6d9fab76ca5b
diff -r 6d9fab76ca5b -r a288ae0fdd74 DataClockPair.h
--- a/DataClockPair.h	Sun May 21 19:17:15 2017 +0000
+++ b/DataClockPair.h	Sun May 21 13:45:39 2017 -0600
@@ -5,5 +5,6 @@
     PinName dataPin;
     PinName clockPin;
     DataClockPair(PinName clk, PinName dat):dataPin(dat), clockPin(clk){};
+    DataClockPair(){};
 };
 #endif