--- a/controls/LogViewer.py	Mon May 06 11:15:05 2013 +0200
+++ b/controls/LogViewer.py	Mon May 06 16:01:17 2013 +0200
@@ -308,7 +308,13 @@
               self.OnSearchMessageSearchButtonClick, self.SearchMessage)
         self.Bind(wx.EVT_SEARCHCTRL_CANCEL_BTN, 
               self.OnSearchMessageCancelButtonClick, self.SearchMessage)
-        filter_sizer.AddWindow(self.SearchMessage, 3, flag=wx.GROW)
+        filter_sizer.AddWindow(self.SearchMessage, 3, border=5, flag=wx.RIGHT|wx.GROW)
+        
+        self.CleanButton = wx.lib.buttons.GenBitmapButton(self, bitmap=GetBitmap("Clean"), 
+              size=wx.Size(28, 28), style=wx.NO_BORDER)
+        self.CleanButton.SetToolTipString(_("Clean log messages"))
+        self.Bind(wx.EVT_BUTTON, self.OnCleanButton, self.CleanButton)
+        filter_sizer.AddWindow(self.CleanButton)
         
         message_panel_sizer = wx.FlexGridSizer(cols=2, hgap=0, rows=1, vgap=0)
         message_panel_sizer.AddGrowableCol(0)
@@ -379,6 +385,7 @@
     
     def SetLogSource(self, log_source):
         self.LogSource = log_source
+        self.CleanButton.Enable(self.LogSource is not None)
         if log_source is not None:
             self.ResetLogMessages()
             self.RefreshView()
@@ -396,18 +403,21 @@
         for level, count, prev in zip(xrange(LogLevelsCount), log_count, self.previous_log_count):
             if count is not None and prev != count:
                 if prev is None:
-                    dump_end = count - 1
+                    dump_end = -1
                 else:
                     dump_end = prev - 1
                 for msgidx in xrange(count-1, dump_end,-1):
                     new_message = self.GetLogMessageFromSource(msgidx, level)
-                    if new_message is not None:
-                        if prev is None:
-                            self.OldestMessages.append((msgidx, new_message))
-                            if len(new_messages) == 0 or new_message > new_messages[0]:
-                                new_messages = [new_message]
+                    if new_message is None:
+                        break
+                    if prev is None:
+                        self.OldestMessages.append((msgidx, new_message))
+                        if len(new_messages) == 0:
+                            new_messages = [new_message]
                         else:
                             new_messages.insert(0, new_message)
+                    else:
+                        new_messages.insert(0, new_message)
                 if prev is None and len(self.OldestMessages) <= level:
                     self.OldestMessages.append((-1, None))
                 self.previous_log_count[level] = count
@@ -608,6 +618,13 @@
         self.ResetMessagePanel()
         event.Skip()
     
+    def OnCleanButton(self, event):
+        if self.LogSource is not None:
+            self.LogSource.ResetLogCount()
+        self.ResetLogMessages()
+        self.RefreshView()
+        event.Skip()
+    
     def GenerateOnDurationButton(self, duration):
         def OnDurationButton():
             self.ScrollMessagePanelByTimestamp(duration)

--- a/runtime/PLCObject.py	Mon May 06 11:15:05 2013 +0200
+++ b/runtime/PLCObject.py	Mon May 06 16:01:17 2013 +0200
@@ -90,12 +90,15 @@
             msg, = args
         return self._LogMessage(level, msg, len(msg))
 
+    def ResetLogCount(self):
+        if self._ResetLogCount is not None:
+            self._ResetLogCount()
 
     def GetLogCount(self, level):
         if self._GetLogCount is not None :
             return int(self._GetLogCount(level))
         elif self._loading_error is not None and level==0:
-            return 1;
+            return 1
 
     def GetLogMessage(self, level, msgid):
         tick = ctypes.c_uint32()
@@ -182,6 +185,9 @@
             self._resumeDebug = self.PLClibraryHandle.resumeDebug
             self._resumeDebug.restype = None
 
+            self._ResetLogCount = self.PLClibraryHandle.ResetLogCount
+            self._ResetLogCount.restype = None
+
             self._GetLogCount = self.PLClibraryHandle.GetLogCount
             self._GetLogCount.restype = ctypes.c_uint32
             self._GetLogCount.argtypes = [ctypes.c_uint8]
@@ -189,7 +195,7 @@
             self._LogMessage = self.PLClibraryHandle.LogMessage
             self._LogMessage.restype = ctypes.c_int
             self._LogMessage.argtypes = [ctypes.c_uint8, ctypes.c_char_p, ctypes.c_uint32]
-            
+
             self._log_read_buffer = ctypes.create_string_buffer(1<<14) #16K
             self._GetLogMessage = self.PLClibraryHandle.GetLogMessage
             self._GetLogMessage.restype = ctypes.c_uint32

--- a/targets/plc_main_tail.c	Mon May 06 11:15:05 2013 +0200
+++ b/targets/plc_main_tail.c	Mon May 06 16:01:17 2013 +0200
@@ -54,6 +54,13 @@
    | counter | Index  | */
 static uint64_t LogCursor[LOG_LEVELS] LOG_BUFFER_ATTRS = {0x0,0x0,0x0,0x0};
 
+void ResetLogCount(void) {
+	uint8_t level;
+	for(level=0;level<LOG_LEVELS;level++){
+		LogCursor[level] = 0;
+	}
+}
+
 /* Store one log message of give size */
 int LogMessage(uint8_t level, char* buf, uint32_t size){
     if(size < LOG_BUFFER_SIZE - sizeof(mTail)){