Re: [Discuss-gnuradio] gain setting in osmosdr block

[Dirk Gorissen]

Thanks Andy.

I may try to submit a patch but will at least create an issue on the
gr-osmosdr side so it can be tracked

On 4 May 2018 at 19:22, Adrian Musceac <address@hidden> wrote:
> Hi Andy,
> Please note that development happens on git.osmocom.org so it's probably
> better to copy their mailing list as well.
>
> Regards,
> Adrian
>
> On May 4, 2018 2:24:46 PM UTC, Andy Walls <address@hidden>
> wrote:
>>>
>>>  From: Dirk Gorissen
>>>  Date: Thu, 3 May 2018 22:25:09 +0100
>>>
>>>  Hello,
>>>
>>>  Im using an airspy mini through the osmosdr block. I would like
>>>  control over the 3 gains the airspy has (IF, Mixer, LNA) but the
>>>  osmossdr block does not seem to expose this. Is there a workaround?
>>
>>
>> The C++ and Python interfaces look like they support setting them:
>>
>>
>> https://github.com/osmocom/gr-osmosdr/blob/master/include/osmosdr/source.h#L185
>> https://github.com/osmocom/gr-osmosdr/blob/master/lib/source_impl.h#L59
>> https://github.com/osmocom/gr-osmosdr/blob/master/lib/source_impl.cc#L667
>> https://github.com/osmocom/gr-osmosdr/blob/master/lib/source_iface.h#L165
>>
>> https://github.com/osmocom/gr-osmosdr/blob/master/lib/airspy/airspy_source_c.h#L108
>>
>> https://github.com/osmocom/gr-osmosdr/blob/master/lib/airspy/airspy_source_c.cc#L533
>>
>> but the GRC file for the GUI block doesn't appear to let you call these
>> from GRC.
>>
>> Workaround:
>>
>> In the Python script generated by GRC, you should be able to make the
>> following calls where appropriate:
>>
>> # Turn off hardware AGC
>> source_block_instance.set_gain_mode(False, 0)
>>
>> # Set gains
>> source_block_instance.set_gain(desired_lna_gain, 'LNA', 0)
>> source_block_instance.set_gain(desired_mix_gain, 'MIX', 0)
>>
>> source_block_instance.set_gain(desired_if_gain,  'IF',  0)
>>
>>
>> The proper fix, is to fix this GRC block XML generator script to
>> present a tab for input of named gains, and to add callbacks for those
>> named gains:
>>
>>
>> https://github.com/osmocom/gr-osmosdr/blob/master/grc/gen_osmosdr_blocks.py
>>
>>
>> Regards,
>> Andy
>>
>>>  Cheers
>>>  Dirk
>>
>>
>>
>> ________________________________
>>
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