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analogdevicesinc / libsmu

Software abstractions for the analog signal exploration tools.
http://analogdevicesinc.github.io/libsmu/
BSD 3-Clause "New" or "Revised" License
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Controling voltage feadback switch in Rev F hardware changed? #115

Open damercer opened 6 years ago

damercer commented 6 years ago

Hi:

I'm not sure how to explain this but it seems that the setting of the switch that connects the voltage input opamp to either the original single I/O pin on the connector or new input only pin on Rev F hardware has changed in libsmu 1.0.

This happens only in discontinuous mode where the AWG is restarted each time a new set of samples are requested.

In the original version of libsmu (0.89) I could do the following before ( and after ) devx.get_samples(SHOWsamples) to open the switch and use the new input only pin:

devx.ctrl_transfer( 0x40, 0x51, 34, 0, 0, 0, 100) # open voltage sense loop CH A devx.ctrl_transfer( 0x40, 0x51, 39, 0, 0, 0, 100) # open voltage sense loop CH B

In libsmu 1.0 this switch is being closed automatically as part of preparing channel for new sweep (get_samples). No matter where I put the ctrl_transfer the switch is never left open.

So can we please put this back to the way it was before to allow the option for use of the new input only pin in the Rev F hardware? Or add new mode settings for split input output option in Rev F?

Thanks

Doug

damercer commented 6 years ago

It's been four months since this issue was posted. Anyone looking into making libsmu more compatible with the new Rev F hardware?

Thanks

Doug

AlexandraTrifan commented 6 years ago

Sorry about this. I will look into it and get back to you.

-Alexandra

damercer commented 6 years ago

Hi: I just tested the changes made in libsmu-1.0.1-g6c2ec2a-setup-x86 and they seem to fix the issue I was seeing where the split I/O switch was being closed again after each sweep in discontinuous mode. I can (will) make a new release of ALICE when this test version makes it into Master.

Thanks Doug

AlexandraTrifan commented 6 years ago

Hi,

I am glad it works. This was just a test version, so probably the version we will merge into master will not be this one. It might be that a new mode setting will be added, such that the mode and switch are not controlled separately. We're working on this and will push and merge it to master as soon as possible.

Thank you -Alexandra

damercer commented 6 years ago

Great, be sure to document any new modes so I can make the proper changes to my code.

Thanks Doug