[hpsdr] Metis

[Bob Cowdery]

Hi John

Thanks for the response.

Regards
Bob

On 09/05/2011 07:38, John Melton wrote:
> Hi Bob,
>
> The Metis code sends 2x512 byte blocks in a single UDP frame, so the
> 1028 byte size frame is correct.
If I understand you correctly I should be seeing 1028 bytes including
the header bytes but I seem to be seeing 1032 including the header bytes
so I'm obviously doing something daft.
> The start command to Metis has an additional bit defined to start the
> wide band scope date.  0x00 stops the flow,  0x01 starts the flow of I/Q
> and Mic data and 0x02 starts the wideband scope data. So sending:
>
> <0xEFFE><0x04><0x03>
>
> will start both streams.
>
> This is in the latest 1.24 "Metis How it Works" document.
That all works fine. I'm using the latest code and docs.
> Regards,
>
> John g0orx/n6lyt
>
>
>
> On Sun, 2011-05-08 at 21:18 +0100, Bob Cowdery wrote:
>> ***** High Performance Software Defined Radio Discussion List *****
>>
>> Hi all
>>
>> Firstly I would like to express my thanks to all involved in the Metis
>> project. A great piece of kit which performs very well. The led's are
>> especially well thought through and were an immense help in bug finding.
>>
>> I just got my software up and running a few days ago and have upgraded
>> to firmware 1.2. The 'Metis - How it works' was very clear and nicely
>> written. There is just one thing I haven't quite figured. The wide band
>> bandscope spec says it sends 4096x16 bit blocks of data but also says
>> the payload is
>>
>> <0xEFFE><0x01><End Point><512 x 16 bit samples>
>>
>> When I actually try and receive this data I get a data length of 1028
>> bytes (after the header bytes). I don't seem to get any other data
>> except the IQ frames.
>>
>> Unless I've done something daft (which I probably have) should there be
>> a sequence number in the above spec which would make the data 1024.
>>
>> How do I handle this data - does it come in 8 frames of the above to
>> make 4096. If so how do I know where the start of the data is or do I
>> just assume the first frame I see is the start and count off blocks of 8
>> frames?
>> What is the frequency of the data?
>>
>> Thanks for any help
>> Bob
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