first re-commit.

pigpio-master/EXAMPLES/C/WIEGAND_CODE/test_wiegand.c

@@ -0,0 +1,42 @@
+#include <stdio.h>
+
+#include <pigpio.h>
+
+#include "wiegand.h"
+
+/*
+
+REQUIRES
+
+Wiegand contacts 0 and 1 connected to separate gpios.
+
+TO BUILD
+
+gcc -o wiegand_c test_wiegand.c wiegand.c -lpigpio -lrt
+
+TO RUN
+
+sudo ./wiegand_c
+
+*/
+
+void callback(int bits, uint32_t value)
+{
+   printf("bits=%d value=%u\n", bits, value);
+}
+
+int main(int argc, char *argv[])
+{
+   Pi_Wieg_t * w;
+
+   if (gpioInitialise() < 0) return 1;
+
+   w = Pi_Wieg(14, 15, callback, 5);
+
+   sleep(300);
+
+   Pi_Wieg_cancel(w);
+
+   gpioTerminate();
+}
+