diff --git a/driver/cli b/driver/cli
index d0c668b..699162a 100755
Binary files a/driver/cli and b/driver/cli differ
diff --git a/driver/cli.cpp b/driver/cli.cpp
index 0947d0c..506e143 100644
--- a/driver/cli.cpp
+++ b/driver/cli.cpp
@@ -108,14 +108,18 @@ void finish(int)
 
 void view_back(int)
 {
-	win_stack.pop_back();
+	if(win_stack.size())
+	{
+		delete win_stack.back();
+		win_stack.pop_back();
+	}
 	if(win_stack.size())
 		win_stack.back()->repaint();
 }
 
 void input(int)
 {
-	std::function<void(int)> nextCall;
+	call_t nextCall;
 	int key;
 	do
 	{
@@ -136,7 +140,7 @@ void show_info(int)
 {
 	ViewInfo* view = new ViewInfo();
 	view->setTitle("Info");
-	view->setText("Informationen zu Board 15 Famulus Edition\nEs war einmal");
+	view->setText("Informationen zu Board 15 Famulus Edition\nEs war einmal...");
 	view->setLabelClose("[ Zurueck ]");
 	view->repaint();
 	
@@ -184,7 +188,10 @@ void write_digital_output0(int)
 {
 	try
 	{
-		uint8_t port = std::stoi(static_cast<ViewPromt*>(win_stack.back())->getInput(), 0, 16);
+		int d = std::stoi(static_cast<ViewPromt*>(win_stack.back())->getInput(), 0, 16);
+		if(d > 255 || 0 > d)
+			throw std::invalid_argument("bad value");
+		uint8_t port = static_cast<uint8_t>(d);
 		
 		B15F& drv = B15F::getInstance();
 		drv.digitalWrite0(port);		
@@ -200,7 +207,10 @@ void write_digital_output1(int)
 {
 	try
 	{
-		uint8_t port = std::stoi(static_cast<ViewPromt*>(win_stack.back())->getInput(), 0, 16);
+		int d = std::stoi(static_cast<ViewPromt*>(win_stack.back())->getInput(), 0, 16);
+		if(d > 255 || 0 > d)
+			throw std::invalid_argument("bad value");
+		uint8_t port = static_cast<uint8_t>(d);
 		
 		B15F& drv = B15F::getInstance();
 		drv.digitalWrite1(port);		
@@ -300,6 +310,42 @@ void show_analog_output1(int)
 	input(0);
 }
 
+
+void stop_selftest(int)
+{
+	B15F& drv = B15F::getInstance();
+	drv.discard();
+}
+
+void start_selftest(int)
+{
+	B15F& drv = B15F::getInstance();
+	drv.activateSelfTestMode();
+	
+	ViewInfo* view = new ViewInfo();
+	view->setTitle("Selbsttest aktiv");
+	view->setText("Das B15 befindet sich jetzt im Selbsttestmodus.\n \nSelbsttest:\nZu Beginn geht der Reihe nach jede LED von BA0 bis BA1 an.\nDanach leuchten die LEDs an AA0 und AA1 kurz auf.\nZum Schluss spiegelt in einer Endlosschleife:\n* BA0 Port BE0\n* BA1 die DIP-Schalter S7\n* AA0 ADC0\n* AA1 ADC1");
+	view->setLabelClose("[ Selbsttest Beenden ]");
+	view->setCall(&stop_selftest);
+	view->repaint();
+	
+	win_stack.push_back(view);
+	input(0);
+}
+
+void show_selftest(int)
+{
+	ViewInfo* view = new ViewInfo();
+	view->setTitle("Selbsttest");
+	view->setText("Bitte entfernen Sie jetzt alle Draehte von den Anschlussklemmen und bestaetigen\nmit Enter.");
+	view->setLabelClose("[ Weiter ]");
+	view->setCall(&start_selftest);
+	view->repaint();
+	
+	win_stack.push_back(view);
+	input(0);
+}
+
 void show_main(int)
 {
 	ViewSelection* view = new ViewSelection();	
@@ -309,6 +355,7 @@ void show_main(int)
 	view->addChoice("[ Digitale Ausgabe BE1 ]", &show_digital_output1);
 	view->addChoice("[ Analoge  Ausgabe AA0 ]", &show_analog_output0);
 	view->addChoice("[ Analoge  Ausgabe AA1 ]", &show_analog_output1);
+	view->addChoice("[ Selbsttest des B15 ]", &show_selftest);
 	view->addChoice("[ Informationen ]", &show_info);
 	view->addChoice("", nullptr);
 	view->addChoice("[ Beenden ]", &finish);
diff --git a/driver/drv/b15f.cpp b/driver/drv/b15f.cpp
index 4348642..43a4a6d 100644
--- a/driver/drv/b15f.cpp
+++ b/driver/drv/b15f.cpp
@@ -55,8 +55,6 @@ void B15F::init()
 
 void B15F::reconnect()
 {
-	std::cout << PRE << "Verbindung unterbrochen, stelle Verbindung neu her: " << std::flush;
-		
 	uint8_t tries = RECONNECT_TRIES;		
 	while(tries--)
 	{
@@ -228,6 +226,8 @@ uint16_t B15F::analogRead(uint8_t channel)
 	usart.writeByte(RQ_ADC);
 	usart.writeByte(channel);
 	uint16_t adc = usart.readInt();
+	if(adc > 1023)
+		throw DriverException("Bad ADC data detected");
 	delay_us(1);
 	return adc;
 }
@@ -251,7 +251,7 @@ void B15F::analogSequence(uint8_t channel_a, uint16_t* buffer_a, uint32_t offset
 		buffer_a[i] = usart.readInt();
 		buffer_b[i] = usart.readInt();
 		if(buffer_a[i] > 1023 || buffer_b[i] > 1023)
-			std::cout << PRE << "bad data detected" << std::endl;
+			throw DriverException("Bad ADC data detected");
 	}
 	
 	uint8_t aw = usart.readByte();		
diff --git a/driver/main b/driver/main
deleted file mode 100755
index 09368ac..0000000
Binary files a/driver/main and /dev/null differ
diff --git a/driver/ui/view.cpp b/driver/ui/view.cpp
index cc50010..d84baf7 100644
--- a/driver/ui/view.cpp
+++ b/driver/ui/view.cpp
@@ -13,6 +13,10 @@ View::View()
 	keypad(win, TRUE);
 }
 
+View::~View()
+{
+}
+
 void View::setWinContext(WINDOW* win)
 {
 	View::win = win;
diff --git a/driver/ui/view.h b/driver/ui/view.h
index 7c8fc31..4bf2ab5 100644
--- a/driver/ui/view.h
+++ b/driver/ui/view.h
@@ -11,11 +11,13 @@
 #include <signal.h>
 
 extern std::string ERR_MSG;
+typedef std::function<void(int)> call_t;
 
 class View
 {
 public:
 	View(void);
+	virtual ~View(void);
 	
 	static void setWinContext(WINDOW* win);
 	static WINDOW* getWinContext(void);
@@ -26,14 +28,14 @@ public:
 	virtual void repaint(void);
 	
 	virtual void draw(void) = 0;
-	virtual std::function<void(int)> keypress(int& key) = 0;
+	virtual call_t keypress(int& key) = 0;
 	
 	
 protected:
 	int width, height;
 	int start_x = 0, start_y = 0;
 	std::string title;
-	std::vector<std::function<void(int)>> calls;
+	std::vector<call_t> calls;
 	
 	static WINDOW* win;
 	constexpr static int KEY_ENT = 10;
diff --git a/driver/ui/view_info.cpp b/driver/ui/view_info.cpp
index 0528d45..056ef0f 100644
--- a/driver/ui/view_info.cpp
+++ b/driver/ui/view_info.cpp
@@ -15,7 +15,7 @@ void ViewInfo::setLabelClose(std::string label)
 	this->label_close = label;
 }
 
-void ViewInfo::setCall(std::function<void(int)> call)
+void ViewInfo::setCall(call_t call)
 {
 	calls[0] = call;
 }
@@ -34,7 +34,7 @@ void ViewInfo::draw()
 	wattroff(win, A_REVERSE);
 }
 
-std::function<void(int)> ViewInfo::keypress(int& key)
+call_t ViewInfo::keypress(int& key)
 {
 	switch(key)
 	{
diff --git a/driver/ui/view_info.h b/driver/ui/view_info.h
index 755dfe4..be5cbf4 100644
--- a/driver/ui/view_info.h
+++ b/driver/ui/view_info.h
@@ -9,9 +9,9 @@ public:
 	ViewInfo(void);
 	virtual void setText(std::string text);
 	virtual void setLabelClose(std::string label);;
-	virtual void setCall(std::function<void(int)> call);
+	virtual void setCall(call_t call);
 	virtual void draw(void) override;
-	virtual std::function<void(int)> keypress(int& key) override;
+	virtual call_t keypress(int& key) override;
 
 protected:
 	std::string text;
diff --git a/driver/ui/view_monitor.cpp b/driver/ui/view_monitor.cpp
index 8f32b61..0dc03cf 100644
--- a/driver/ui/view_monitor.cpp
+++ b/driver/ui/view_monitor.cpp
@@ -4,7 +4,7 @@ ViewMonitor::ViewMonitor() : t_worker(&ViewMonitor::worker, this)
 {	
 }
 
-std::function<void(int)> ViewMonitor::keypress(int& key)
+call_t ViewMonitor::keypress(int& key)
 {
 	switch(key)
 	{
diff --git a/driver/ui/view_monitor.h b/driver/ui/view_monitor.h
index bb64cda..33552bf 100644
--- a/driver/ui/view_monitor.h
+++ b/driver/ui/view_monitor.h
@@ -13,7 +13,7 @@ class ViewMonitor : public ViewInfo
 	
 public:
 	ViewMonitor(void);
-	virtual std::function<void(int)> keypress(int& key) override;
+	virtual call_t keypress(int& key) override;
 
 private:
 	std::string fancyDigitalString(uint8_t& b);
diff --git a/driver/ui/view_promt.cpp b/driver/ui/view_promt.cpp
index 241dfe3..57ab60d 100644
--- a/driver/ui/view_promt.cpp
+++ b/driver/ui/view_promt.cpp
@@ -2,12 +2,18 @@
 
 void ViewPromt::draw()
 {
+	curs_set(2); // show cursor
+	
 	int li = text_offset_y;
+	int ci = 0;
 	for(std::string line : str_split(message + input, "\n"))
-		mvwprintw(win, li++, text_offset_x, "%s", line.c_str());
+	{
+		mvwprintw(win, ++li, text_offset_x, "%s", line.c_str());
+		ci = line.length() + text_offset_x;
+	}
 	
 	button_offset_x = (width - label_cancel.length() - sep.length() - label_confirm.length()) / 2;
-	button_offset_y = height - text_offset_y + 1;
+	button_offset_y = height - text_offset_y;
 	
 	if(selection == 0)
 	{
@@ -25,6 +31,7 @@ void ViewPromt::draw()
 		mvwprintw(win, button_offset_y, button_offset_x + label_cancel.length() + sep.length(), "%s", label_confirm.c_str());
 		wattroff(win, A_REVERSE);
 	}
+	wmove(win, li, ci);
 }
 
 void ViewPromt::setMessage(std::string message)
@@ -99,7 +106,8 @@ std::function<void(int)> ViewPromt::keypress(int& key)
 			if(selection == 0) // exit
 				key = -1; // do return from view
 			else
-				ret = call_confirm;			
+				ret = call_confirm;
+			curs_set(0); // hide cursor again
 			break;
 		default:
 			break;
@@ -108,6 +116,7 @@ std::function<void(int)> ViewPromt::keypress(int& key)
 	if(key >= ' ' && key <= '~')
 		input += (char) key;
 	
-	repaint();
+	if(key != KEY_ENT)
+		repaint();
 	return ret;
 }
diff --git a/driver/ui/view_promt.h b/driver/ui/view_promt.h
index d48be9c..fb74100 100644
--- a/driver/ui/view_promt.h
+++ b/driver/ui/view_promt.h
@@ -10,10 +10,10 @@ class ViewPromt : public View
 public:
 	virtual void draw(void) override;
 	virtual void setMessage(std::string message);
-	virtual void setConfirm(std::string name, std::function<void(int)> call);
+	virtual void setConfirm(std::string name, call_t call);
 	virtual void setCancel(std::string name, bool cancelable);
 	virtual std::string getInput(void);
-	virtual std::function<void(int)> keypress(int& key) override;
+	virtual call_t keypress(int& key) override;
 
 protected:
 	size_t selection = 1;
@@ -22,11 +22,11 @@ protected:
 	std::string label_confirm = "[ OK ]";
 	std::string sep = "   ";
 	std::string label_cancel = "[ Cancel ]";
-	std::function<void(int)> call_confirm = nullptr;
+	call_t call_confirm = nullptr;
 	bool cancelable = true;
 	int button_offset_x = 0, button_offset_y = 0;
 	constexpr static int text_offset_x = 2;
-	constexpr static int text_offset_y = 3;
+	constexpr static int text_offset_y = 2;
 };
 
 #endif // VIEW_PROMT_H
diff --git a/driver/ui/view_selection.cpp b/driver/ui/view_selection.cpp
index 88c30c7..5b947bd 100644
--- a/driver/ui/view_selection.cpp
+++ b/driver/ui/view_selection.cpp
@@ -13,15 +13,15 @@ void ViewSelection::draw()
 	}
 }
 
-void ViewSelection::addChoice(std::string name, std::function<void(int)> call)
+void ViewSelection::addChoice(std::string name, call_t call)
 {
 	choices.push_back(name);
 	calls.push_back(call);
 }
 
-std::function<void(int)> ViewSelection::keypress(int& key)
+call_t ViewSelection::keypress(int& key)
 {
-	std::function<void(int)> ret = nullptr;
+	call_t ret = nullptr;
 	switch(key)
 	{
 		case KEY_UP:
diff --git a/driver/ui/view_selection.h b/driver/ui/view_selection.h
index 5079b2f..4963f73 100644
--- a/driver/ui/view_selection.h
+++ b/driver/ui/view_selection.h
@@ -9,8 +9,8 @@ class ViewSelection : public View
 {
 public:
 	virtual void draw(void) override;
-	virtual void addChoice(std::string name, std::function<void(int)> call);
-	virtual std::function<void(int)> keypress(int& key) override;
+	virtual void addChoice(std::string name, call_t call);
+	virtual call_t keypress(int& key) override;
 	
 
 protected: