292 lines
7.4 KiB
Python
292 lines
7.4 KiB
Python
import serial
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from thread import start_new_thread, allocate_lock
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import time
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import threading
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class Display(threading.Thread):
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def __init__(self,portname="/dev/ttyUSB0"):
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threading.Thread.__init__(self)
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self.serialport=None
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self.runme=True
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self.idlemessage=None
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self.portlock = allocate_lock()
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self.portname=portname
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self.brightness=5
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self.scroll_line1 = None
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self.scroll_line2 = None
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self.offset_line1 = 0
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self.offset_line2 = 0
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self.screensaver = Screensaver(self)
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self.open_port()
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def __del__(self):
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if (not self.screensaver == None):
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self.screensaver.terminate()
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self.screensaver = None
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if (not self.serialport == None):
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self.serialport.close()
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self.serialport=None
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def open_port(self):
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self.mutex_get()
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try:
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self.serialport = serial.Serial(self.portname,9600,timeout=2,rtscts=True, dsrdtr=True)
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#print ("Initializing display on port:\n %s\n" % self.serialport )
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self.cmd_reset()
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self.mutex_release()
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except Exception as e:
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#print ("Exception opening serial port '%s' for display\n" % self.portname)
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#print ("Ignoring and trying to open it again later\n")
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#print (e)
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self.serialport = None
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self.mutex_release()
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pass
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#Helper-Function, scrolls text in a specific line.
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def display_scroll_text(self,line,text):
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if (line==1): #clear the line on invocation:
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self.cmd("\x1f\x24\x01%c\x18" % chr(line) )
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self.scroll_line1 = text
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self.offset_line1=0
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if (line==2): #clear the line on invocation:
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self.cmd("\x1f\x24\x01%c\x18" % chr(line) )
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self.scroll_line2 = text
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self.offset_line2=0
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def display_handle_scroll(self,line,text,offset):
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if (text):
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l = len(text)
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if (l<21):
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if (offset == 0):
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self.cmd("\x1f\x24\x01%c%s" % (chr(line),text[offset:(20+offset)]))
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offset=1
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else:
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self.cmd("\x1f\x24\x01%c%s" % (chr(line),text[offset:(20+offset)]))
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missing_chars=20+offset-l
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if (missing_chars>0):
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self.cmd(text[:missing_chars])
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offset=((offset+1)%l)
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else:
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offset=0 #reset offset
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return offset
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def run(self):
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#print "Starting Display thread"
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self.screensaver.start()
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while(self.runme):
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#print("display thread loop\n")
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self.mutex_get()
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#print("display got mutex and handles scroll\n")
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self.offset_line1 = self.display_handle_scroll(1,self.scroll_line1,self.offset_line1)
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self.offset_line2 = self.display_handle_scroll(2,self.scroll_line2,self.offset_line2)
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self.mutex_release()
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time.sleep(.5)
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#print "Exiting Display thread"
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def terminate(self):
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self.runme = False
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#Front-End Funtion to display a Screen
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# with heading
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def display_screen(self,title,message):
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self.mutex_get()
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self.offset_line1=0
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self.offset_line2=0
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self.screensaver.idle_reset();
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self.cmd_brightness(5)
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if (len(title)<21):
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self.scroll_line1=None
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self.cmd("\x1f\x24\x01%c\x18%s" % (chr(1),'\xdb'*20) )
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if (len(title)<20):
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pos=1+(20-len(title))/2
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else:
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pos=1
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self.cmd("\x1f\x24%c%c%s" % (chr(pos),chr(1),title) )
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else:
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self.display_scroll_text(1,title)
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self.display_scroll_text(2,message)
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self.mutex_release()
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def cmd_reset(self):
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#reset the display
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self.cmd("\x1b\x40")
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def cmd_cursor_show(self,on=True):
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#show or hide the cursor
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if (on):
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self.cmd("\x1f\x43\x01")
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else:
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self.cmd("\x1f\x43\x00")
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def cmd_blink(self,rate=127):
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self.cmd("\x1f\x45%c" % chr(rate))
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def cmd_brightness(self,level):
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if (self.brightness==level):
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return
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#print("setting brightness to %i \n" %level)
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if (level==0): #turn off:
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self.cmd_display_on(False)
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self.brightness = 0
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return
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else:
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if (self.brightness==0): #turn on, then set wanted brightness:
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self.cmd_display_on(True)
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self.brightness = level
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self.cmd("\x1F\x58%c" % chr(level-1) )
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def cmd_display_on(self,on=True):
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# blink-command:
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# where the last value defines the blink rate,
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# with 0=always on, 255=always off
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if (on):
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if (not self.brightness==0):
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return
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#print("setting display to on: %s \n" % str(on))
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self.cmd_blink(0)
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self.brightness=5
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else:
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if (self.brightness==0):
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return
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#print("setting display to on: %s \n" % str(on))
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self.cmd_blink(255)
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self.brightness=0
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def cmd_curmode_overwrite(self):
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self.cmd_curmode(1)
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def cmd_curmode_vscroll(self):
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self.cmd_curmode(2)
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def cmd_curmode_hscroll(self):
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self.cmd_curmode(3)
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def cmd_curmode(self,val=2):
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self.cmd("\x1f%c" % chr(val))
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def cmd_clear(self):
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self.cmd("\x0c")
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def cmd_time(self):
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# activate timer display in lower right corner.
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# actual time has to be set via display_set_timer.
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self.cmd("\x1f\x55")
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def cmd_time_set(self,h=None,m=None):
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if (h==None or m==None):
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now = time.localtime()
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h=now.tm_hour
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m=now.tm_min
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# configures hour and minutes of the internal clock and
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# displays the time in the lower right corner.
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# turns off when something gets written into the line.
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# two bytes have to follow with hour and minute
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self.cmd("\x1F\x54%c%c" % (chr(h),chr(m)) )
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self.cmd_curmode_hscroll() # makes the time more robust...
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def cmd(self,text): #for commands: do not reset screensaver timeout
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self.write(text,False)
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def write(self,text,idle_reset=True): #for data: reset screensaver timeout
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if (not self.serialport == None):
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if (idle_reset):
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self.screensaver.idle_reset();
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self.serialport.write(text)
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else:
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self.open_port()
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def setIdlemessage(self,text):
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self.idlemessage=text
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def getIdlemessage(self):
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return self.idlemessage
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def mutex_get(self):
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self.portlock.acquire()
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def mutex_release(self):
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self.portlock.release()
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def terminate(self):
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if (not self.screensaver == None):
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self.screensaver.terminate()
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self.screensaver = None
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import threading
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import time
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class Screensaver (threading.Thread):
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def __init__(self,display):
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threading.Thread.__init__(self)
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self.display=display
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self.runme=True
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self.idlecounter=0
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self.timeout_dim=10
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self.timeout_message=20
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self.timeout_off=32
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self.mutex = allocate_lock()
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threading.Thread.__init__(self)
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def run(self):
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print "Starting Screensaver thread"
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while(self.runme):
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self.mutex.acquire()
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self._main_loop()
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self.mutex.release()
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time.sleep(.5)
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print "Exiting Screensaver thread"
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def terminate(self):
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self.runme = False
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def idle_reset(self):
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self.mutex.acquire()
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self.idlecounter=0
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self.display.cmd_brightness(5)
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self.mutex.release()
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def _main_loop(self):
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if (self.idlecounter < self.timeout_off):
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self.idlecounter+=1
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if (self.idlecounter>=self.timeout_dim and self.idlecounter <= (self.timeout_dim+7)):
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x = (8-( self.idlecounter - self.timeout_dim))/2
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self.display.mutex_get()
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self.display.cmd_brightness(1+x)
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self.display.mutex_release()
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return
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if (self.idlecounter==self.timeout_message):
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self.display.mutex_get()
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self.display.cmd_time_set()
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self.display.scroll_line1 = self.display.getIdlemessage()
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self.display.mutex_release()
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return
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if (self.idlecounter==self.timeout_off):
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self.display.mutex_get()
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self.display.cmd_display_on(False)
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self.display.mutex_release()
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return
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def __del__(self):
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print("bye")
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