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 Forum index » Clavia Nord Modular » Bugs
OS 1.40 BinCounter Module Bug
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varice



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PostPosted: Tue Feb 12, 2008 12:11 am    Post subject: OS 1.40 BinCounter Module Bug Reply with quote  Mark this post and the followings unread

Well, it may be a long shot to report another bug in the G2 in the hope of getting it fixed, but for what it's worth...

The attached patch shows that the BinCounter module (in OS version 1.40) appears to have a bug that causes it to malfunction after a certain number of clock cycles. When the malfunction occurs, it appears that all of the module outputs jump to a higher incorrect rate.

BinCounter1 clocked at 48KHz will run for about 2 minutes and 55 seconds and then malfunction. It will crash at lower clock rates, it just takes longer. At any rate, it will crash just after the 128 output of BinCounter3 goes high (the BinCounter modules are cascaded). Resetting the counter will clear the fault, but it will crash again when it reaches the same count.

Tested on a G2X running in patch mode without any MIDI connections. The G2 Demo Software version 1.40 running on a Windows PC also has the same bug.


BinCounter Bug.pch2
 Description:

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 Filename:  BinCounter Bug.pch2
 Filesize:  2.05 KB
 Downloaded:  765 Time(s)


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Fozzie



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PostPosted: Tue Feb 12, 2008 1:47 am    Post subject: Reply with quote  Mark this post and the followings unread

Interesting little bug you have there! It appears the bincounters do not reset when they reach 255, but internally keep on counting. I remember that Rob mentions in his G2/synthesis workshop pages that the internal resolution of the G2 is 32768 subdivisions per clavia unit. Since the max headroom of the G2 is 4x64=256 clavia units, my guess is it works like this: it would take a counter at 48kHz (32768 * 256) / 48000 = 174.8 seconds to reach max internal value. Which is very very close to your clocked 175 seconds (2'55'').

Luckily, the reset input on the bincounter can be used easily enough to work around this bug, but a bug it is for sure.

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Antimon



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PostPosted: Tue Feb 12, 2008 9:20 am    Post subject: Reply with quote  Mark this post and the followings unread

Hmm, I wonder if this might be what is causing this: http://electro-music.com/forum/topic-20812.html

which was also a weird problem with a patch (that contained a bincounter) that appeared after a while.

/Stefan

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Blue Hell
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PostPosted: Tue Feb 12, 2008 1:19 pm    Post subject: Reply with quote  Mark this post and the followings unread

Antimon wrote:
Hmm, I wonder if this might be what is causing this: http://electro-music.com/forum/topic-20812.html

which was also a weird problem with a patch (that contained a bincounter) that appeared after a while.


Seems so ... there was some reasoning there that could indicate it was going faster than usual as well after an hour or so, just like described here.

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PostPosted: Tue Feb 12, 2008 1:30 pm    Post subject: Reply with quote  Mark this post and the followings unread

When fast it seems to run at 256 times the rate ... at all outputs, so all outputs just pass on the input clock it seems.
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varice



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PostPosted: Wed Feb 13, 2008 1:16 am    Post subject: Reply with quote  Mark this post and the followings unread

A workaround for this bug is to connect a flipflop and XNOR gate to each BinCounter as shown in the attached patch that will auto reset the counter at the time that it rolls over at count 256. If you do not need to have an external reset for the BinCounter, then you do not have to use the OR gate. Just connect the output of the XNOR gate to the reset input of the BinCounter and FlipFlop modules.

This is the best solution that I could think of. If anyone can think of a better way, please share it!


BinCounter BugWA.pch2
 Description:
BinCounter Bug Workaround

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 Filename:  BinCounter BugWA.pch2
 Filesize:  2.66 KB
 Downloaded:  770 Time(s)


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Antimon



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PostPosted: Wed Feb 13, 2008 1:21 am    Post subject: Reply with quote  Mark this post and the followings unread

Just want to say: nice bug tracing, Varice!

/Stefan

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varice



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PostPosted: Wed Feb 13, 2008 1:44 am    Post subject: Reply with quote  Mark this post and the followings unread

Antimon wrote:
Just want to say: nice bug tracing, Varice!


Thanks Stefan! I actually worked for many years as an electronic technician and then as a hardware and software test engineer. I guess I was good enough at troubleshooting that I was able to make a living by doing it.

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