forgot to add

F3:F303/InterfaceBoard/Debug.h

@@ -0,0 +1,42 @@
+/*
+ * This file is part of the multiiface project.
+ * Copyright 2026 Edward V. Emelianov <edward.emelianoff@gmail.com>.
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#pragma once
+
+#include "usb_dev.h"
+
+// debugging messages on config interface
+#ifdef EBUG
+#define STR_HELPER(s)   #s
+#define STR(s)          STR_HELPER(s)
+#define DBG(str)        do{debug_message_text(__FILE__ " (L" STR(__LINE__) "): " str); debug_newline_only();}while(0)
+#define DBGs(str)       debug_message_text(str)
+#define DBGch(ch)       debug_message_char(ch)
+#define DBGn()          debug_newline_only()
+#define DBGpri()        print_debug_messages();
+#else
+#define DBG(str)
+#define DBGs(str)
+#define DBGn()
+#define DBGpri()
+#endif
+
+void debug_message_text(const char *str);
+void debug_message_char(char ch);
+void debug_newline_only();
+void print_debug_messages();