diff --git a/src/gfx2log.c b/src/gfx2log.c
index f5be9857..7207d50b 100644
--- a/src/gfx2log.c
+++ b/src/gfx2log.c
@@ -80,3 +80,22 @@ extern void GFX2_LogV(GFX2_Log_priority_T priority, const char * fmt, va_list ap
   vfprintf((unsigned)priority >= GFX2_INFO ? stdout : stderr, fmt, ap);
 #endif
 }
+
+extern void GFX2_LogHexDump(GFX2_Log_priority_T priority, const char * header, const byte * data, long offset, long count)
+{
+  long i;
+  while (count > 0)
+  {
+    GFX2_Log(priority, "%s%06X:", header, offset);
+    for (i = 0; i < count && i < 16; i++)
+      GFX2_Log(priority, " %02x", data[offset+i]);
+    while(i++ < 16)
+      GFX2_Log(priority, "   ");
+    GFX2_Log(priority, " | ");
+    for (i = 0; i < count && i < 16; i++)
+      GFX2_Log(priority, " %c", data[offset+i]>=32 && data[offset+i]<127 ? data[offset+i] : '.');
+    GFX2_Log(priority, "\n");
+    count -= i;
+    offset += i;
+  }
+}
diff --git a/src/gfx2log.h b/src/gfx2log.h
index 287b67ca..e4bf925d 100644
--- a/src/gfx2log.h
+++ b/src/gfx2log.h
@@ -22,6 +22,12 @@
 #define GFX2LOG_H_DEFINED
 
 #include <stdarg.h>
+#include "struct.h"
+
+/**
+ * @defgroup log error and debugging logs
+ * @{
+ */
 
 typedef enum {
   GFX2_ERROR = 0,
@@ -32,8 +38,14 @@ typedef enum {
 
 extern GFX2_Log_priority_T GFX2_verbosity_level;
 
+/**
+ * Log error or debugging info
+ */
 extern void GFX2_Log(GFX2_Log_priority_T priority, const char * fmt, ...);
 
 extern void GFX2_LogV(GFX2_Log_priority_T priority, const char * fmt, va_list ap);
 
+extern void GFX2_LogHexDump(GFX2_Log_priority_T priority, const char * header, const byte * data, long offset, long count);
+
+/** @} */
 #endif