Now, v2 works.

src/debug.c

@@ -0,0 +1,73 @@
+/*
+ * debug.c -- Debuging with virtual COM port
+ *
+ * Copyright (C) 2010 Free Software Initiative of Japan
+ * Author: NIIBE Yutaka <gniibe@fsij.org>
+ *
+ * This file is a part of Gnuk, a GnuPG USB Token implementation.
+ *
+ * Gnuk 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.
+ *
+ * Gnuk 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/>.
+ *
+ */
+
+#include "config.h"
+#include "ch.h"
+#include "gnuk.h"
+
+static void
+put_hex (uint8_t nibble)
+{
+  uint8_t c;
+
+  if (nibble < 0x0a)
+    c = '0' + nibble;
+  else
+    c = 'a' + nibble - 0x0a;
+
+  _write (&c, 1);
+}
+
+void
+put_byte (uint8_t b)
+{
+  put_hex (b >> 4);
+  put_hex (b &0x0f);
+  _write ("\r\n", 2);
+}
+
+void
+put_byte_with_no_nl (uint8_t b)
+{
+  _write (" ", 1);
+  put_hex (b >> 4);
+  put_hex (b &0x0f);
+}
+
+void
+put_short (uint16_t x)
+{
+  put_hex (x >> 12);
+  put_hex ((x >> 8)&0x0f);
+  put_hex ((x >> 4)&0x0f);
+  put_hex (x & 0x0f);
+  _write ("\r\n", 2);
+}
+
+void
+put_string (const char *s)
+{
+  _write (s, strlen (s));
+}
+
+