Add the 74HC595 Snake game project

08-74HC595-Snake/error.h

@@ -0,0 +1,15 @@
+#ifndef _ERROR_H_
+#define _ERROR_H_
+
+#define ERRNO_SUCCESS         0
+#define ERRNO_NULLPOINTER     1
+#define ERRNO_IO              2
+#define ERRNO_TIMEOUT         3
+#define ERRNO_CALIBRATION     4
+#define ERRNO_OUTOFBOUNDS     5
+
+#define ERROR(x) errno=x; return x;
+
+extern int errno;
+
+#endif // _ERROR_H_