1 reply to this topic

[DavidRS]

Hello,

I am trying to use the U3 counters. I would like to be able to get both counting at the same time, which is proving difficult.

I am using python 2.7. The LJControlPanel says the unit has the latest f/w.

 

The code I am trying to run is:

#========================================

    d = u3.U3()     # Get the 

    #print d.config()

    #d.SetToFactoryDefaults(1)

    #d.open()

    d.setDefaults()     # Put everything back to factory default

    #d.debug = True

    LED_delay = 1.0

    LEDloop = 0

    lastGUIcounter = GUIcounter

    exittest = 0

    

    #d.configIO(FIOAnalog = 15)

    start_time = time.time()

    LEDnext_time = start_time + LED_delay

    

    print temperatureC(d)

    

    mains_on_off( d, 0 )       # Off to start with

    #d.configIO(FIOAnalog=0)

    #d.configIO(NumberOfTimersEnabled = 2)

    d.configIO(EnableCounter0=1, TimerCounterPinOffset = 4 )

    d.configIO(EnableCounter1=1, TimerCounterPinOffset = 5 )        

 

    #d.configIO(EnableTimer0=0, TimerCounterPinOffset = 6 )        

    #d.configIO(EnableTimer1=0, TimerCounterPinOffset = 7 )        

 

    print "Starting Loop"

    while ExitNow == 0:

        current_time = float( time.time() )

        if current_time > LEDnext_time: 

            

            count0 = d.getFeedback(u3.Counter0(Reset = False))

            print count0

 

            count1 = d.getFeedback(u3.Counter1(Reset = False))

            print count1      

            

            LEDnext_time += LED_delay

            LEDloop += 1

            #print LEDloop

            #print LEDnext_time

 

            loopCounter += 1

            print loopCounter

            # check GUI is still running, exit if it is not

 

        if GUIcounter > lastGUIcounter:

            lastGUIcounter = GUIcounter

            exittest = 0

        else:

            exittest += 1

 

        if exittest > 10:

            ExitNow = 1     # give up

            

        time.sleep(0.25)

 

    print "mainloop() exit"

#========================================

 

The error I get is:

27.8735856006

Starting Loop

Exception in thread Thread-2:

Traceback (most recent call last):

  File "c:\python27\lib\threading.py", line 810, in __bootstrap_inner

    self.run()

  File "c:\python27\lib\threading.py", line 763, in run

    self.__target(*self.__args, **self.__kwargs)

  File "ST230.py", line 91, in mainloop

    count0 = d.getFeedback(u3.Counter0(Reset = False))

  File "c:\python27\lib\site-packages\u3.py", line 754, in getFeedback

    raise LowlevelErrorException("\nThis Command\n    %s\nreturned an error:\n    %s" %  (culprit , lowlevelErrorToString(rcvBuffer[6])))

LowlevelErrorException:

This Command

    <u3.Counter0( Reset = False )>

returned an error:

    XBR_CONFIG_ERROR (7)

 

If I use one counter at a time, it works fine.

Any ideas?

Thanks & Regards

David

 

[LabJack Support]

When enabling multiple counters with configIO, you need to do it in one call otherwise the second call overwrites the first call's settings. In your case, Counter1 is being enabled on FIO5 and since counter0 is not being set in that call it is defaulted to disabled. Try a call like this instead to enable the counters:

#Enable both counters starting at FIO4 (Counter0 on FIO4, Counter1 on FIO5)
d.configIO(EnableCounter0=1, EnableCounter1=1, TimerCounterPinOffset = 4)