first re-commit.

pigpio-master/EXAMPLES/CPP/WIEGAND_CODE/wiegand.hpp

@@ -0,0 +1,43 @@
+#ifndef WIEGAND_HPP
+#define WIEGAND_HPP
+
+#include <stdint.h>
+
+typedef void (*WiegandCB_t)(int, uint32_t);
+
+class Wiegand
+{
+   int mygpio_0, mygpio_1, mytimeout, in_code, bits;
+
+   WiegandCB_t mycallback;
+
+   uint32_t num;
+
+   uint32_t code_timeout;
+
+   void _cb(int gpio, int level, uint32_t tick);
+
+   /* Need a static callback to link with C. */
+   static void _cbEx(int gpio, int level, uint32_t tick, void *user);
+
+   public:
+
+   Wiegand(int gpio_0, int gpio_1, WiegandCB_t callback, int timeout=5);
+   /*
+      This function establishes a Wiegand decoder on gpio_0 and gpio_1.
+
+      A gap of timeout milliseconds without a new bit indicates
+      the end of a code.
+
+      When the code is ended the callback function is called with the code
+      bit length and value.
+   */
+
+   void cancel(void);
+   /*
+      This function releases the resources used by the decoder.
+   */
+};
+
+#endif
+