--- a/connectors/LPC/LPCAppObject.py	Fri Feb 18 12:29:48 2011 +0100
+++ b/connectors/LPC/LPCAppObject.py	Tue Feb 22 14:11:50 2011 +0100
@@ -98,7 +98,7 @@
                 if force !=None:
                     c_type,unpack_func, pack_func = self.TypeTranslator.get(iectype, (None,None,None))
                     forced_type_size = ctypes.sizeof(c_type)
-                    forcedsizestr = chr(forced_type_size)
+                    forced_type_size_str = chr(forced_type_size)
                     forcestr = ctypes.string_at(
                                 ctypes.pointer(
                                  pack_func(c_type,force)),
@@ -119,15 +119,16 @@
         strbuf = self.HandleSerialTransaction(
                                      GET_TRACE_VARIABLETransaction())
         if strbuf is not None and len(strbuf) > 4 and self.PLCStatus == "Started":
+            res=[]
             size = len(strbuf) - 4
             tick = ctypes.cast(
                     ctypes.c_char_p(strbuf[:4]),
                     ctypes.POINTER(ctypes.c_int)).contents
-            buffer = ctypes.cast(
+            buff = ctypes.cast(
                       ctypes.c_char_p(strbuf[4:]),
                       ctypes.c_void_p)
             for idx, iectype, forced in self._Idxs:
-                cursor = ctypes.c_void_p(buffer.value + offset)
+                cursor = ctypes.c_void_p(buff.value + offset)
                 c_type,unpack_func, pack_func = self.TypeTranslator.get(iectype, (None,None,None))
                 if c_type is not None and offset < size:
                     res.append(unpack_func(ctypes.cast(cursor,

--- a/connectors/LPC/LPCBootObject.py	Fri Feb 18 12:29:48 2011 +0100
+++ b/connectors/LPC/LPCBootObject.py	Tue Feb 22 14:11:50 2011 +0100
@@ -46,7 +46,9 @@
 
     def MatchMD5(self, MD5):
         res = self.HandleSerialTransaction(CHECKMD5Transaction(MD5))
-        return "".join(res).find('FAILED') == -1
+        if res :
+            return "".join(res).find('FAILED') == -1
+        return False
 
 
     def SetTraceVariablesList(self, idxs):

--- a/targets/LPC/plc_LPC_main.c	Fri Feb 18 12:29:48 2011 +0100
+++ b/targets/LPC/plc_LPC_main.c	Tue Feb 22 14:11:50 2011 +0100
@@ -6,6 +6,12 @@
 
 /* provided by POUS.C */
 extern unsigned long long common_ticktime__;
+extern unsigned long __tick;
+
+static int debug_locked = 0;
+static int _DebugDataAvailable = 0;
+static unsigned long __debug_tick;
+
 void LPC_GetTime(IEC_TIME*);
 void LPC_SetTimer(unsigned long long next, unsigned long long period);
 
@@ -43,11 +49,16 @@
 
 int TryEnterDebugSection(void)
 {
-    return __DEBUG;
+    if(!debug_locked && __DEBUG){
+        debug_locked = 1;
+		return 1;
+    }
+    return 0;
 }
 
 void LeaveDebugSection(void)
 {
+        debug_locked = 0;
 }
 
 int stopPLC(void)
@@ -56,30 +67,40 @@
     return 0;
 }
 
-extern unsigned long __tick;
-int _DebugDataAvailable = 0;
 /* from plc_debugger.c */
 int WaitDebugData(unsigned long *tick)
 {
-    *tick = __tick;
-    return _DebugDataAvailable;
+    /* no blocking call on LPC */
+    if(_DebugDataAvailable && !debug_locked){
+        /* returns 0 on success */
+        *tick = __debug_tick;
+        _DebugDataAvailable = 0;
+        return 0;
+    }
+    return 1;
 }
 
 /* Called by PLC thread when debug_publish finished
  * This is supposed to unlock debugger thread in WaitDebugData*/
 void InitiateDebugTransfer(void)
 {
+    /* remember tick */
+    __debug_tick = __tick;
     _DebugDataAvailable = 1;
 }
 
 void suspendDebug(int disable)
 {
+    /* Prevent PLC to enter debug code */
     __DEBUG = !disable;
+    debug_locked = !disable;
 }
 
 void resumeDebug(void)
 {
+    /* Let PLC enter debug code */
     __DEBUG = 1;
+    debug_locked = 0;
 }
 
 int CheckRetainBuffer(void)