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I would very much appreciate seeing that paper.
I'll email you shortly.
Where is the appropriate place to be discussing this stuff ?
Thanks.
2010-01-06 23:59:12 UTC by guy9
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well, not the best place.
However, the DSP does a bit of DSPing... but it is a mix a all hard real time jobs (scanning & probing & ....) + signal processing/adaptive filtering, LockIn, ... yes. There is a paper submitted I may Email you.
Looks at the all open source DSP code....
2010-01-06 23:25:46 UTC by zahl
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Ummm.... is this the right place to be asking these questions ?
Thanks.
2010-01-06 23:02:32 UTC by guy9
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Thanks, Percy.
I read the DSP section. There are 2 block diagrams that are helpful but a lot of the details are still foggy.
Reading in between the lines, the DSP doesn't really do any DSPing, it mostly accepts commands from the Linux machine and runs the D/A and A/D converters. From what I can tell, the DSP isn't running any 16 tap FIR filters, for example.
This is an exploratory...
2010-01-06 23:01:18 UTC by guy9
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Hey,
start here:
http://gxsm.sourceforge.net/?content=gxsmdocusection§ion=Documentation:%20Manual
you may also "compile" the latest gxsm manual from CVS -- checkout Gxsm-Manual module from gxsm CVS.
In addition, have a look at the SRanger project page and web site (DSP) but first check the DSP related sections in teh Gxsm manual, do not miss to read the hardware plugin sections...
2010-01-06 22:38:01 UTC by zahl
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My group has tasked me with building an STM using GXSM.
I have an electronics/comp science background. I've been using Linux forever.
I'm looking for a "Start Here" document as far as the electronics goes. Is there one around ? How about a block diagram for a complete STM system ?
What do the signal processors in the SRanger boards do ?
How many channels of ADC are needed ?...
2010-01-06 22:23:38 UTC by guy9
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stm added wotheis to the GXSM project.
2010-01-06 16:38:18 UTC by stm
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stm added bdrevniok to the GXSM project.
2009-12-08 18:56:23 UTC by stm
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Yes it is the SR-STD that I'm using.
Thanks for the above info, using the dissipation signal (AIC1) it looks like I'll be able to temporarily invert the gain of the feedback control to prevent a tip crash in non-contact afm. I've not had time to test this properly yet, but hopefully my next reply will confirm this :)
2009-12-02 15:13:18 UTC by spxrje
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It sounds like you still have the old SR-STD/SP2? Is that right?
If so, use (SRanger - STD and -SP2):
AIC0-in for friction (x-deflection) in case of contact
AIC1-in for dissipation signal (or what ever you want to use for the FUZZY)
AIC5 as usual for feedback input (dF) ...
also you have to use the Fuzzy-control via the python scripts.
2009-12-01 19:45:04 UTC by zahl
