add dump functions

avr/usbload/debug.h

@@ -1,5 +1,22 @@
+#ifndef DEBUG_H
+#define DEBUG_H
+
 #include <stdlib.h>
-#include <stdint.h> 
+#include <stdint.h>
+#include <stdarg.h>
+
+
+#if defined(NO_DEBUG) && defined(__GNUC__)
+/* gcc's cpp has extensions; it allows for macros with a variable number of
+   arguments. We use this extension here to preprocess pmesg away. */
+#define debug(level, format, args...) ((void)0)
+#else
+void debug(int level, char *format, ...);
+/* print a message, if it is considered significant enough.
+      Adapted from [K&R2], p. 174 */
+#endif
 
 void dump_packet(uint32_t addr,uint32_t len,uint8_t *packet);
 
+#endif /* DEBUG_H */
+