start to write switch.c

V1/switch.c

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+/* 
+ * switch.c
+ * How to register an button and count this
+ * author: Simon Wörner, Manuel Vögele,
+ * 	   Siegfried Kienzle
+ * 24-March-2017
+ * 
+ * */
+
+//Source: http://elinux.org/RPi_GPIO_Code_Samples:
+#define BCM2837_PERIPHERIAL_BASE 0x3F000000
+#define GPIO_BASE (BCM2837_PERIPHERIAL_BASE + 0x3F000000) 
+
+
+