diff --git a/core/include/rb2/proxy.h b/core/include/rb2/proxy.h
index df8a21e..e5c3e7e 100755
--- a/core/include/rb2/proxy.h
+++ b/core/include/rb2/proxy.h
@@ -15,6 +15,8 @@
 
 struct _rb2_proxy;
 typedef struct _rb2_proxy	RB2_PROXY;
+typedef struct _rb2_proxy	rb2_proxy_t;
+
 #define RB2_PROXY(ptr)		((RB2_PROXY*)(ptr))
 
 
diff --git a/core/include/sys/assert.h b/core/include/sys/assert.h
index a391217..bbb50d5 100644
--- a/core/include/sys/assert.h
+++ b/core/include/sys/assert.h
@@ -25,9 +25,8 @@ int32_t _assert_current_error(void);
 	#define noassert(f)		_noassert( (f), getPC() )
 
 #else
-	
 	#define assert2(f,p)		(f)
-	#define assert(f)			(f)
+	#define assert(f)			{ int r = (f); if (r<0) { return r; }; }
 	#define noassert(f)			(f)
 	
 	#define _assert_read()			(0)
diff --git a/core/include/sys/runtime.h b/core/include/sys/runtime.h
index cae9fe2..807044b 100755
--- a/core/include/sys/runtime.h
+++ b/core/include/sys/runtime.h
@@ -9,8 +9,6 @@
 #include <stdint.h>
 
 
-
-
 #define ASSERT_BUFFER_LEN	8
 
 #define RTA_USER0		0x01
@@ -101,9 +99,13 @@ struct rt_ram {
 	uint32_t	unix_timeoffset;
 	unix_time_changing_t
 				unix_time_changing;
-	
+
+#if !defined(RUNTIME_USES_THREADING)	
 	SYSTIMER	*timer;
-	
+#else
+	thread_t	*rtThread;
+#endif
+
 	systick_t	secs_last;
 	systick_t	secs_current,
 				secs_gone;
diff --git a/core/src/runtime.c b/core/src/runtime.c
index 35239c3..e1d87c7 100755
--- a/core/src/runtime.c
+++ b/core/src/runtime.c
@@ -11,17 +11,23 @@
   *
  * @{
 */
-
- volatile struct rt_ram	rt_ram;
+volatile struct rt_ram	rt_ram;
 
 /*! \brief Signal Thread.
  *
  */
 void runtime_signal(void)
 {
+#if !defined(RUNTIME_USES_THREADING)	
 	timer_start( rt_ram.timer, 1L );
+#else
+	thread_wake( rt_ram.rtThread );
+#endif
 };
 
+
+
+
 /*! \brief Runtime-Thread.
  *
  * Ermittelt Betriebsstunden des Geräts
@@ -44,6 +50,23 @@ void runtime_cycle(void)
 	rt_ram.secs_last = rt_ram.secs_current;
 };
 
+
+
+#if defined(RUNTIME_USES_THREADING)
+
+void runtime_thread(void* arg){
+	
+	while (1){
+		wait_ms( 10000l );
+		runtime_cycle();
+	};
+	
+};
+
+#endif
+
+
+
 /*! \brief Startet Runtime-Thread.
  *
  */
@@ -62,8 +85,16 @@ void runtime_start(int16_t bank)
 	rt_ram.secs_last = systick_secs();
 	rt_ram.bank = bank;
 	
+#if !defined(RUNTIME_USES_THREADING)
+	
 	rt_ram.timer = timer_create_ex( TIMERID_SYS_RUNTIME, 10000000L, runtime_cycle, TF_REPEAT);
 	timer_start( rt_ram.timer, 0 );
+	
+#else
+
+	thread_alloc( runtime_thread, NULL, 256 );
+	
+#endif
 };
 
 
diff --git a/core/src/usart.c b/core/src/usart.c
index af4bcb2..2a6bcb3 100644
--- a/core/src/usart.c
+++ b/core/src/usart.c
@@ -83,12 +83,13 @@ int usart_tx		(uint8_t usart,char *b,int size){
 	for (n=0;n<size;n++){
 		for (r=0;r<10;r++){
 			if (usart_write( usart, *(b++)) >= 0){
-				break;
+				return ESUCCESS;
 			};
 			wait_ms(1);
 		};
 	};
+	return -EFAIL;
 };
 
 	
-#endif
\ No newline at end of file
+#endif