[hpsdr] Metis

[John Melton]

Hi Bob,

The Metis code sends 2x512 byte blocks in a single UDP frame, so the
1028 byte size frame is correct.

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.

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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