Merge branch 'display-threading'

client-barcode/display.py

@@ -0,0 +1,291 @@
+import serial
+from thread import start_new_thread, allocate_lock
+import time
+import threading
+
+class Display(threading.Thread):
+	def __init__(self,portname="/dev/ttyUSB0"):
+	        threading.Thread.__init__(self)
+		self.serialport=None
+		self.runme=True
+		self.idlemessage=None
+		self.portlock = allocate_lock()
+		self.portname=portname
+		self.brightness=5
+	        self.scroll_line1 = None
+		self.scroll_line2 = None
+		self.offset_line1 = 0
+		self.offset_line2 = 0
+		self.screensaver = Screensaver(self)
+		self.open_port()
+
+	def __del__(self):
+		if (not self.screensaver == None):
+			self.screensaver = None
+
+		if (not self.serialport == None):
+			self.serialport.close()
+			self.serialport=None
+
+	def open_port(self):
+
+		self.mutex_get()
+		try:
+			self.serialport = serial.Serial(self.portname,9600,timeout=2,rtscts=True, dsrdtr=True)
+			#print ("Initializing display on port:\n  %s\n" % self.serialport )
+			self.cmd_reset()
+			self.mutex_release()
+		except Exception as e:
+			#print ("Exception opening serial port '%s' for display\n" % self.portname)
+			#print ("Ignoring and trying to open it again later\n")
+			#print (e)
+			self.serialport = None
+			self.mutex_release()
+			pass
+		
+
+	#Helper-Function, scrolls text in a specific line.
+	def display_scroll_text(self,line,text):
+		if (line==1): #clear the line on invocation:
+			self.cmd("\x1f\x24\x01%c\x18" % chr(line) )
+			self.scroll_line1 = text
+			self.offset_line1=0
+		if (line==2): #clear the line on invocation:
+			self.cmd("\x1f\x24\x01%c\x18" % chr(line) )
+			self.scroll_line2 = text
+			self.offset_line2=0
+
+
+	def display_handle_scroll(self,line,text,offset):
+		if (text):
+			l = len(text)
+			if (l<21):
+				if (offset == 0):
+					self.cmd("\x1f\x24\x01%c%s" % (chr(line),text[offset:(20+offset)]))
+					offset=1
+			else:   
+				self.cmd("\x1f\x24\x01%c%s" % (chr(line),text[offset:(20+offset)]))
+				missing_chars=20+offset-l
+				if (missing_chars>0):
+					self.cmd(text[:missing_chars])
+				offset=((offset+1)%l)
+		else:   
+			offset=0        #reset offset
+		return offset
+
+
+	def run(self):
+		#print "Starting Display thread" 
+		self.screensaver.start()
+		while(self.runme):
+			#print("display thread loop\n")
+			self.mutex_get()
+			#print("display got mutex and handles scroll\n")
+			self.offset_line1 = self.display_handle_scroll(1,self.scroll_line1,self.offset_line1)
+	                self.offset_line2 = self.display_handle_scroll(2,self.scroll_line2,self.offset_line2)
+			self.mutex_release()
+			time.sleep(.5)
+		print "Exiting Display thread"
+
+
+
+
+	#Front-End Funtion to display a Screen
+	# with heading
+	def display_screen(self,title,message):
+		self.mutex_get()
+
+	        self.offset_line1=0
+	        self.offset_line2=0
+	        self.screensaver.idle_reset();
+	        self.cmd_brightness(5)
+
+	        if (len(title)<21):
+	                self.scroll_line1=None
+	                self.cmd("\x1f\x24\x01%c\x18%s" % (chr(1),'\xdb'*20) )
+	                if (len(title)<20):
+	                        pos=1+(20-len(title))/2
+	                else:
+	                        pos=1
+	                self.cmd("\x1f\x24%c%c%s" % (chr(pos),chr(1),title) )
+	        else:
+	                self.display_scroll_text(1,title)
+	
+	        self.display_scroll_text(2,message)
+		self.mutex_release()
+
+
+
+
+	def cmd_reset(self):
+		#reset the display
+		self.cmd("\x1b\x40")
+
+	def cmd_cursor_show(self,on=True):
+		#show or hide the cursor
+		if (on): 
+			self.cmd("\x1f\x43\x01")
+		else:
+			self.cmd("\x1f\x43\x00")
+
+	def cmd_blink(self,rate=127):
+		self.cmd("\x1f\x45%c" % chr(rate))
+
+
+	def cmd_brightness(self,level):
+		if (self.brightness==level):
+			return
+		#print("setting brightness to %i \n" %level)
+		if (level==0): #turn off:
+			self.cmd_display_on(False)	
+                        self.brightness = 0
+                        return
+		else:  
+			if (self.brightness==0): #turn on, then set wanted brightness:
+				self.cmd_display_on(True)	
+                        self.brightness = level
+                        self.cmd("\x1F\x58%c" % chr(level-1) )
+
+	def cmd_display_on(self,on=True):
+		# blink-command: 
+		# where the last value defines the blink rate, 
+		# with 0=always on, 255=always off
+		if (on):
+			if (not self.brightness==0):
+				return
+			#print("setting display to on: %s \n" % str(on))
+			self.cmd_blink(0)
+			self.brightness=5
+		else:
+			if (self.brightness==0):
+				return
+			#print("setting display to on: %s \n" % str(on))
+			self.cmd_blink(255)
+			self.brightness=0
+
+	def cmd_curmode_overwrite(self):
+		self.cmd_curmode(1)			
+
+	def cmd_curmode_vscroll(self):
+		self.cmd_curmode(2)			
+
+	def cmd_curmode_hscroll(self):
+		self.cmd_curmode(3)			
+
+	def cmd_curmode(self,val=2):
+		self.cmd("\x1f%c" % chr(val))
+
+	def cmd_clear(self):
+		self.cmd("\x0c")
+
+	
+	def cmd_time(self):
+		# activate timer display in lower right corner.
+		# actual time has to be set via display_set_timer.
+		self.cmd("\x1f\x55")
+
+	def cmd_time_set(self,h=None,m=None):
+		if (h==None or m==None):
+			now = time.localtime()
+			h=now.tm_hour
+			m=now.tm_min
+		# configures hour and minutes of the internal clock and
+		# displays the time in the lower right corner.
+		# turns off when something gets written into the line.
+		# two bytes have to follow with hour and minute
+		self.cmd("\x1F\x54%c%c" % (chr(h),chr(m)) )
+		self.cmd_curmode_hscroll() # makes the time more robust...
+
+	def cmd(self,text): #for commands: do not reset screensaver timeout
+		self.write(text,False)
+
+	def write(self,text,idle_reset=True): #for data: reset screensaver timeout
+		if (not self.serialport == None):
+			if (idle_reset):
+				self.screensaver.idle_reset();
+				self.scroll_line1=None
+				self.scroll_line2=None
+			self.serialport.write(text)	
+		else:
+			self.open_port()	
+
+	def setIdlemessage(self,text):
+		self.idlemessage=text
+	
+	def getIdlemessage(self):
+		return self.idlemessage
+
+	def mutex_get(self):
+		self.portlock.acquire()
+
+	def mutex_release(self):
+		self.portlock.release()
+
+	def terminate(self):
+		self.runme=False
+		if (not self.screensaver == None):
+			self.screensaver.terminate()
+			self.screensaver = None
+		
+
+import threading
+import time
+
+class Screensaver (threading.Thread):
+	def __init__(self,display):
+	        threading.Thread.__init__(self)
+		self.display=display
+		self.runme=True
+		self.idlecounter=0
+		self.timeout_dim=30
+		self.timeout_message=60
+		self.timeout_off=300
+		self.mutex = allocate_lock()
+	        threading.Thread.__init__(self)
+
+	def run(self):
+		#print "Starting Screensaver thread" 
+		while(self.runme):
+			self.mutex.acquire()
+			self._main_loop()
+			self.mutex.release()
+			time.sleep(.5)
+		#print "Exiting Screensaver thread"
+
+	def terminate(self):
+		self.runme = False
+
+
+	def idle_reset(self):
+		self.mutex.acquire()
+		self.idlecounter=0
+		self.display.cmd_brightness(5)
+		self.mutex.release()
+
+
+	def _main_loop(self):
+		if (self.idlecounter < self.timeout_off):
+			self.idlecounter+=1
+		if (self.idlecounter>=self.timeout_dim and self.idlecounter <= (self.timeout_dim+7)):
+			x = (8-( self.idlecounter - self.timeout_dim))/2
+			self.display.mutex_get()
+			self.display.cmd_brightness(1+x)
+			self.display.mutex_release()
+			return
+
+		if (self.idlecounter==self.timeout_message):
+			self.display.mutex_get()
+			self.display.cmd_time_set()
+			self.display.scroll_line1 = self.display.getIdlemessage()
+			self.display.mutex_release()
+			return
+
+		if (self.idlecounter==self.timeout_off):
+			self.display.mutex_get()
+                        self.display.cmd_display_on(False)
+			self.display.mutex_release()
+			return
+		
+	def __del__(self):
+		print("bye")
+

client-barcode/freitagskasse.py

@@ -7,6 +7,7 @@
 from __future__ import print_function
 import freitagslib.network as net
 from freitagslib.commands import BuyCommand, DepositCommand
+from freitagslib.encoding import asciify
 
 import colorama
 from colorama import Fore, Style
@@ -17,7 +18,13 @@ from decimal import Decimal
 import os
 import time
 import urllib2
+import select
 
+from display import Display
+from thread import start_new_thread, allocate_lock
+import time
+
+myDisplay=None
 
 COLOR_HINT = Fore.YELLOW + Style.BRIGHT
 COLOR_ERROR = Fore.RED
@@ -30,6 +37,24 @@ COLOR_MUCH = Fore.YELLOW + Style.BRIGHT
 
 COLOR_RESET = Style.RESET_ALL
 
+display_fifo = None
+
+scroll_line1 = None
+scroll_line2 = None
+
+
+offset_line1 = 0
+offset_line2 = 0
+
+brightness  = 5
+screensaver = 0
+
+SCREENSAVER_DIM     = 2* 20
+SCREENSAVER_TIMEOUT = 2* 120
+SCREENSAVER_OFF     = 2* 10*60
+
+lock = allocate_lock()
+
 
 def clear():
 	os.system('clear')
@@ -85,6 +110,30 @@ def error_page(error_message, hint_message=None):
 	delay('Weiter', delay_seconds)
 
 
+def item_info_page(item):
+	indent = 4 * ' '
+
+	clear()
+	print('Diese Ware heißt')
+	print()
+	print(indent + COLOR_SOME + item.name + COLOR_RESET)
+	print()
+	print('und kostet')
+	print()
+	if item.deposit > 0:
+		print(indent + '%s%4.2f Euro%s  (plus %4.2f Euro Pfand) .' \
+				% (COLOR_MUCH, item.price, COLOR_RESET, item.deposit))
+	else:
+		print(indent + '%s%4.2f Euro%s .' \
+				% (COLOR_MUCH, item.price, COLOR_RESET))
+	print()
+	print()
+	print(COLOR_MUCH + 'Zum Kaufen bitte einloggen.' + COLOR_RESET)
+	print()
+
+	delay('Weiter', 3)
+
+
 class Status:
 	def __init__(self):
 		self._reset()
@@ -97,6 +146,7 @@ class Status:
 		self.transfers = None
 
 	def dump(self):
+
 		def sign(amount, plus='+'):
 			return '-' if amount < 0 else plus
 
@@ -108,9 +158,15 @@ class Status:
 					% ('', '', color(balance), sign(balance, plus),
 						abs(balance), COLOR_RESET))
 
+		def shorten(text, length):
+			if len(text) <= length:
+				return text
+			else:
+				return text[:length - 3] + '...'
+
 		def show_item(position, diff, label, color):
 			print('%2d) %-40s  %s%c %6.2f Euro%s' \
-					% (position, label, color, sign(diff),
+					% (position, shorten(label, 40), color, sign(diff),
 					abs(diff), COLOR_RESET))
 
 		def show_bar():
@@ -119,6 +175,7 @@ class Status:
 		if self.logged_in():
 			print('Eingeloggt als:  %s%s%s' % (COLOR_SOME, self.login_name, COLOR_RESET))
 			print()
+			myDisplay.write('\x0cHallo %-14s' % (self.login_name[:13]+"!") )
 			if self.transfers:
 				initial_command, initial_balance = self.transfers[0]
 
@@ -137,6 +194,25 @@ class Status:
 						show_item(i, command.difference(), command.label(), COLOR_DEPOSIT)
 						i += 1
 				show_bar()
+
+				if isinstance(command, BuyCommand):
+					mycmd = 0;
+					if (command.includes_commodity()):
+						mycmd+=1;
+					if (command.includes_deposit()):
+						mycmd+=2;
+					if (mycmd==1):	
+						mylabel=command.item_name()
+					if (mycmd==2):	
+						mylabel="Pfand "+command.commodity_label()[:9]
+					if (mycmd==3):	
+						mylabel=("%-13s" % (command.commodity_label()[:13]))+"+P"
+					myDisplay.write('\x0b%-15s %4.2f' % (asciify(mylabel)[:15],abs(command.difference())));
+					myDisplay.write('\x0b\nSUMME: {%02i} %8.2f' % ((i-1),initial_balance - self.balance));
+				else:
+					myDisplay.write('\x0b%-15s %4.2f' % (command.label()[:15],abs(command.difference())));
+					myDisplay.write('\x0b\nSUMME: {%02i} %8.2f' % ((i-1),initial_balance - self.balance));
+
 				if len(self.transfers) > 1:
 					show_total(self.balance - initial_balance, plus='+')
 					show_bar()
@@ -144,11 +220,13 @@ class Status:
 
 				if self.balance < 0:
 					warn_balance()
+					myDisplay.write('\x0b\nKonto: %5.2f!' % (self.balance) )
 					print()
 
 				print(COLOR_MUCH + 'Committen nicht vergessen.' + COLOR_RESET)
 			else:
 				print('Kontostand beträgt:  %s%.2f Euro%s' % (COLOR_MUCH, self.balance, COLOR_RESET))
+				myDisplay.display_screen("KONTOSTAND","%s: %.2f Euro" % (self.login_name,self.balance))
 				if self.balance < 0:
 					print()
 					warn_balance()
@@ -156,6 +234,7 @@ class Status:
 			print(COLOR_MUCH + 'Bitte einloggen.' + COLOR_RESET)
 			print()
 			print('Scanne dazu deine ID-Karte mit dem Barcode-Leser.')
+			myDisplay.display_screen("LOGIN","Bitte scanne Deinen login-Token! *** ")
 		print()
 
 	def logged_in(self):
@@ -172,6 +251,10 @@ class Status:
 		self.balance = balance
 		self.transfers = list()
 
+	def logout(self):
+		# Must not fail if not logged in
+		self._reset()
+
 	def commit(self):
 		assert(self.logged_in())
 
@@ -180,6 +263,7 @@ class Status:
 			try:
 				command.run(self.login_name)
 			except urllib2.HTTPError as e:
+				myDisplay.display_screen("Server error",'Server Error: %s' % str(e))
 				error_page('FEHLER bei Kommunikation mit Server "%s"' % str(e))
 				break
 			else:
@@ -191,8 +275,8 @@ class Status:
 			self.dump()
 			delay('Logout', 3)
 
-			# Logout
+			self.logout()
-			self._reset()
+
 
 	def find(self, barcode):
 		try:
@@ -262,9 +346,11 @@ class Status:
 				error_page(_PRODUCT_FIRST)
 				return
 			if prev.includes_deposit():
+				myDisplay.write('\x0cFEHLER: schon Pfand %20s' % prev.item_name()[:20])
 				error_page('FEHLER: Pfand für Produkt "%s" bereits aktiviert' % prev.item_name())
 				return
 			if prev.deposit_value() <= 0:
+				myDisplay.write('\x0cFEHLER: Pfandfrei!  %20s' % prev.item_name()[:20])
 				error_page('FEHLER: Produkt "%s" hat kein Pfand' % prev.item_name())
 				return
 			before = prev.difference()
@@ -302,14 +388,18 @@ class Status:
 
 def print_prompt():
 	sys.stdout.write(">>> ")
+	sys.stdout.flush()
 
 
 def handle(line, status):
 	if line == 'exit':
 		clear()
+		myDisplay.write("\x0c")
+		myDisplay.terminate()
 		sys.exit(0)
 
 	if status.logged_in():
+		myDisplay.setIdlemessage(" Comitten nicht vergessen! ***")
 		if line in CODES:
 			call = CODES[line]
 			method = call[0]
@@ -320,39 +410,72 @@ def handle(line, status):
 				item = status.find(line)
 			except urllib2.HTTPError as e:
 				if e.code == 404:  # URL not found == item not found with REST
+					myDisplay.display_screen("FEHLER","Code ist unbekannt: '%s'" % ( line[:23]))
 					error_page('FEHLER: Aktion oder Ware "%s" nicht bekannt' % line)
 				else:
+					myDisplay.display_screen("Server error",'%20s' % str(e)[:20])
 					error_page('FEHLER bei Kommunikation mit Server "%s"' % str(e))
 			else:
 				status.buy(item)
 	else:
+		myDisplay.setIdlemessage("Mir ist langweilig!")
 		try:
 			status.login(line)
 		except urllib2.HTTPError as e:
 			if e.code == 404:  # URL not found == user unknown
-				error_page('FEHLER: Benutzer "%s" nicht bekannt' % line,
+				# Try same code as a product
+				item = None
+				try:
+					item = status.find(line)
+				except urllib2.HTTPError as e:
+					pass
+
+				if item is None:
+					myDisplay.display_screen("FEHLER","Nutzer ist  unbekannt: '%s' *** " % line)
+
+					error_page('FEHLER: Produkt oder Nutzer "%s" nicht bekannt' % line,
 							hint_message='Ist in der WebApp unter "Einstellungen" ' \
 							'für Ihren Account Plugin "BarcodePlugin" ' \
 							'als erlaubt markiert?')
 				else:
+					item_info_page(item)
+
+			else:
+				myDisplay.display_screen("FEHLER",'Server Error %20s' % str(e)[:20])
 				error_page('FEHLER bei Kommunikation mit Server "%s"' % str(e))
 		except urllib2.URLError as e:
 			error_page('FEHLER bei Kommunikation mit Server "%s"' % str(e))
 
 
+def read_line(f, timeout, timeout_func):
+	ready_to_read, _, _ = select.select([f], [], [], timeout)
+	if ready_to_read:
+		return f.readline().rstrip()
+	else:
+		timeout_func()
+		return ''
+
+
 def main():
 	colorama.init()
 	status = Status()
+	global scroll_line1,scroll_line2
+	global myDisplay
 
+	myDisplay = Display("/dev/ttyUSB0")
+	myDisplay.start()
+	myDisplay.cmd_reset()
+	myDisplay.cmd_cursor_show(False)
+
+	myDisplay.display_screen("HINWEIS","Herzlich willkommen bei der Freitagsrunde! *** ")
+	time.sleep(5)
 	while True:
 		clear()
 		status.dump()
 		print_prompt()
-		l = sys.stdin.readline()
+		line = read_line(sys.stdin, timeout=3*60.0, timeout_func=status.logout)
-		if not l:
-			break
-		line = l.rstrip()
 		if line:
+			myDisplay.write('\x0cBarcode:\n%20s' % line[:20])
 			handle(line, status)
 
 
@@ -360,4 +483,7 @@ if __name__ == '__main__':
 	try:
 		main()
 	except KeyboardInterrupt:
+		myDisplay.terminate()
+		myDisplay.write("\x1b\x40Goodbye!")
 		pass
+

client-barcode/freitagslib/encoding.py

@@ -0,0 +1,42 @@
+#! /usr/bin/env python
+# -*- coding: utf-8 -*-
+#
+# Copyright (C) 2011 Sebastian Pipping <sebastian@pipping.org>
+# Licensed under GPL v3 or later
+
+from __future__ import print_function
+
+def ensure_unicode(candidate, encoding='utf-8'):
+	if isinstance(candidate, basestring) \
+			and not isinstance(candidate, unicode):
+		return unicode(candidate, encoding)
+	return candidate
+
+
+def asciify(text):
+	_mapping = (
+		('ö', 'oe'),
+		('Ö', 'Oe'),
+		('ä', 'ae'),
+		('Ä', 'Ae'),
+		('ü', 'ue'),
+		('Ü', 'Ue'),
+		('ß', 'ss'),
+	)
+	_mapping = dict(((ord(unicode(key, 'utf-8')), value) for key, value in _mapping))
+
+	def subst(unichar):
+		def fix(unichar):
+			if ord(unichar) > 127:
+				return unicode('?')
+			return unichar
+
+		return _mapping.get(ord(unichar), fix(unichar))
+
+	unichars = ensure_unicode(text, 'utf-8')
+	unitext = ''.join(subst(e) for e in unichars)
+	return unitext.encode('ascii')
+
+	
+if __name__ == '__main__':
+	print(asciify('Schöfferhofer'))

display-daemon/Makefile

@@ -2,3 +2,5 @@ CFLAGS=-g -Wall
 ser:  ser.c
 	gcc -ggdb -Wall ser.c -o ser -lpthread
 	#mipsel-linux-uclibc-gcc -o ser.mips ser.c -lpthread
+run:  ser
+	./ser

display-daemon/ser.c

@@ -1,3 +1,9 @@
+/*
+ * Copyright (C) 2011 Florian Streibelt <florian@freitagsrunde.org>
+ * Licensed under GPL v3 or later
+ *
+ */
+
 #include <stdio.h>		/* Standard input/output definitions */
 #include <string.h>		/* String function definitions */
 #include <unistd.h>		/* UNIX standard function definitions */
@@ -14,9 +20,13 @@
 
 
 int fd;
+int display_dirty=0;
 int screensaver;
 int brightness = 4;
+int offset = 0;
 char *fifo;
+char *pausemsg = NULL;
+
 pthread_mutex_t mutex1 = PTHREAD_MUTEX_INITIALIZER;
 pthread_t thread1;
 
@@ -42,30 +52,51 @@ initport (int fd)
   return 1;
 }
 
-
+//reset the display to defaults
 char display_init[] = { 0x1b, 0x40 };
-char display_showtime[] = { 0x1F, 0x54 };
+
+//show or hide the cursor
 char display_cursor_off[] = { 0x1f, 0x43, 0x0 };
 char display_cursor_on[] = { 0x1f, 0x43, 0x1 };
 
+// blink-command: 
+// where the last value defines the blink rate, 
+// with 0=always on, 255=always off
 char display_on[] = { 0x1f, 0x45, 0x0 };
 char display_off[] = { 0x1f, 0x45, 0xff };
 
+//Modes for new chars:
 char display_overwrite[] = { 0x1f, 0x01 };
 char display_vscroll[] = { 0x1f, 0x02 };
 char display_hscroll[] = { 0x1f, 0x03 };
 
+//clear and cursor home
 char display_clear_screen[] = { 0x0c };
 
+// activate timer display in lower right corner.
+// actual time has to be set via display_set_timer.
 char display_time[] = { 0x1f, 0x55 };
 
+// configures hour and minutes of the internal clock and
+// displays the time in the lower right corner.
+// turns off when something gets written into the line.
+// two bytes have to follow with hour and minute
+char display_set_timer[] = { 0x1F, 0x54 };
+
+// various commands for the display:
+
+// send a command sequence from the heap(!) {sizeof used}
+// only to be used within the macros presented below!
 #define DWC(c)               display_write(c,sizeof(c))
+
+//send a null terminated string:
 #define SEND_TEXT(t)         display_write(t,strlen(t))
 
+//various commands
 #define SEND_DISPLAY_INIT    DWC(display_init)
 #define SEND_CURSOR_OFF      DWC(display_cursor_off)
 #define SEND_CURSOR_ON       DWC(display_cursor_on)
-#define SEND_DEFINE_TIMER    DWC(display_showtime)
+#define SEND_DEFINE_TIMER    DWC(display_set_timer)
 #define SEND_SHOW_TIMER      DWC(display_time)
 #define SEND_MODE_OVERWRITE  DWC(display_overwrite)
 #define SEND_MODE_VSCROLL    DWC(display_vscroll)
@@ -74,19 +105,21 @@ char display_time[] = {0x1f,0x55};
 #define SEND_DISPLAY_ON      DWC(display_on)
 #define SEND_CLEAR           DWC(display_clear_screen);
 
+// internal defines.
 #define TIME_BASE  	     200000
 #define TB_TO_SECS(x)        (x*1000000/TIME_BASE)
 
-#define TIME_CLOCK	     TB_TO_SECS(5)
+#define TIME_CLOCK	     TB_TO_SECS(65)
-#define TIME_DIM 	     TB_TO_SECS(30)
+#define TIME_DIM 	     TB_TO_SECS(90)
-#define TIME_OFF 	     TB_TO_SECS(120)
+#define TIME_OFF 	     TB_TO_SECS(520)
 
 #define DEVICE               "/dev/ttyUSB0"
 
-#define PAUSEMSG             "Hallo, bitte melde Dich am Barcodereader an, um das Kassensystem zu benutzen *** Angebot: Die Mate heute nur 0.75 *** "
 
+// chars per line in our display:   
 #define LINELEN 20
 
+
 void
 display_write (const void *buf, size_t count)
 {
@@ -127,6 +160,14 @@ showtime (void)
   display_write (msg, strlen (msg));
 }
 
+void 
+send_display_init(){
+	  SEND_DISPLAY_INIT;
+	  SEND_CURSOR_OFF;
+	  SEND_DISPLAY_ON;
+	  SEND_MODE_OVERWRITE;
+}
+
 void
 display_dim (short i)
 {
@@ -144,10 +185,7 @@ display_dim (short i)
       char *d;
       if (brightness == 0)
 	{
-	  SEND_CURSOR_OFF;
+	 send_display_init();
-	  // turn display on again
-	  SEND_DISPLAY_ON;
-          SEND_MODE_OVERWRITE;
 	  char c[4] = { 0x1f, 0x58, 0x04, 0x00 };
 	  l = 6;
 	  //c[5]=i;
@@ -188,6 +226,12 @@ rthread (void *args)
 	{
 
 	  screensaver = 0;
+          if (display_dirty) {
+		printf("DEBUG: resetting display\n");
+	 	send_display_init();
+		display_dirty=0;
+	  }
+	  display_dim (4);
 
 	  if (pc == '\n')
 	    {
@@ -198,7 +242,6 @@ rthread (void *args)
 	      display_write (&c, 1);
 	    }
 	  pc = c;
-	  display_dim (4);
 	}
       close (pipe);
     }
@@ -208,18 +251,48 @@ void
 sighandler (int sig)
 {
   pthread_kill (thread1, 0);
-
+  send_display_init();
-  SEND_DISPLAY_INIT;
-  SEND_MODE_OVERWRITE;
-  SEND_CURSOR_OFF;
   SEND_DISPLAY_OFF;
 
   close (fd);
-  if (fifo) {unlink(fifo);}
+  if (fifo)
+    {
+      unlink (fifo);
+    }
   exit (0);
   //signal(sig, sighandler);
 }
 
+void scrolltext(){
+
+	if (pausemsg){
+	  char *message = calloc (LINELEN + 1, sizeof (char));
+
+	int spaces=0;
+
+	  if (offset<LINELEN){
+            spaces = LINELEN-offset; //anzahl spaces im ersten durchgang
+            memset(message , ' ', spaces);
+          }
+
+	  strncpy (message+spaces,  pausemsg + offset - LINELEN, LINELEN-spaces);
+
+	  offset=(offset + 1) % (strlen(pausemsg)+LINELEN);
+	  if (offset==0){
+	   offset=LINELEN;
+	  }
+
+	  int l = strlen (message);
+	  if (l < LINELEN)
+	    {
+	      message = strncat (message, pausemsg, LINELEN - l);
+	    }
+
+	  SEND_TEXT ("\x0b");
+	  SEND_TEXT (message);
+	  free (message);
+	}
+}
 
 int
 main (int argc, char **argv)
@@ -228,12 +301,15 @@ main (int argc, char **argv)
 
   //TODO: arg parser!
   fifo = strdup ("/tmp/display");
+  pausemsg = NULL ; //strdup("Bitte scanne Deine ID-Karte um Dich anzumelden *** "); 
 
  if (argc != 2)
     {
       devnode = strdup (DEVICE);
       printf ("no device specified, using default %s\n", devnode);
-    }else{
+    }
+  else
+    {
       devnode = strdup (argv[1]);
     }
   fd = open (devnode, O_RDWR | O_NOCTTY | O_NDELAY);
@@ -250,9 +326,7 @@ main (int argc, char **argv)
   initport (fd);
 
   //init display, set, vertical scroll, cursor off
-  SEND_DISPLAY_INIT;
+  send_display_init();
-  SEND_MODE_OVERWRITE;
-  SEND_CURSOR_OFF;
 
   pthread_create (&thread1, NULL, rthread, NULL);
   signal (SIGINT, sighandler);
@@ -273,37 +347,43 @@ main (int argc, char **argv)
   sleep (3);
 
   screensaver = 0;
+  offset = 0; // offset for scrolltext in screensaver
 
   while (1)
     {
       usleep (TIME_BASE);
-      //printf ("screensaver = %05d brightness: %d\n", screensaver, brightness);
+
-      if (screensaver < 10000)
+      if (0 == (screensaver) % TB_TO_SECS (1))
 	{
+	  //one-second event comes HERE:
+	  printf
+	    ("debug: screensaver: %d time until clock: %d time until dim: %d time until off: %d\n",
+	     screensaver, TIME_CLOCK - screensaver, TIME_DIM - screensaver,
+	     TIME_OFF - screensaver);
+	}
+
+      //printf ("screensaver = %05d brightness: %d\n", screensaver, brightness);
+      if (screensaver <  (TIME_CLOCK + TIME_OFF + TIME_DIM + 10)){
 	screensaver++;
       }
 
       if (screensaver == TIME_CLOCK)
 	{
+	  display_dirty=1;
 	  showtime ();
 	}
       if (screensaver == TIME_OFF)
 	{
+	  display_dirty=1;
 	  display_dim (0);
 	}
 
 
       //show a scroll text while the screensaver is active...
-      if ((screensaver > (TIME_CLOCK+10)) && (screensaver < TIME_OFF)){
+      if ((screensaver > (TIME_CLOCK + 10)) && (screensaver < TIME_OFF))
-        char *message = calloc(LINELEN+1,sizeof(char));
+	{
-        strncpy(message,PAUSEMSG+((screensaver-TIME_CLOCK-1)%strlen(PAUSEMSG)),LINELEN);
+	        display_dirty=1;
-        int l = strlen(message);
+		scrolltext();
-        if (l<LINELEN){
-         message = strncat(message, PAUSEMSG , LINELEN-l);
-        }
-        SEND_TEXT("\x0b");
-        SEND_TEXT(message);
-        free(message);
 	}
 
       //after some more seconds of inactivity dim display and finally turn off