[hpsdr] Metis

[Bob Cowdery]

Hi Phil

Yes, I'm still managing to squeeze in some development. As usual I've
gone off on another slightly experimental path but more on that when I
get a bit further.

Regards
Bob

On 09/05/2011 01:59, Phil Harman wrote:
> Hi Bob,
>
> Nice to hear from you and even more so that you are using Metis with your
> code.
>
> Basically the wide band scope code grabs 4096 consecutive 16 bit raw
> samples from Mercury and stores them in a FIFO on Metis.
>
> So all you need to do is to keep reading from Metis until you have 4096
> words and then process them. In which case you are spot on.
Would I be right in thinking then that an EP4 frame after an EP6 frame
is the first frame of bandscope data and then 7 more frames will follow
consecutively without and intervening EP6 frames.
> Not sure what you mean by frequency of the data. The raw samples are at
> 122.88MHz and the data rate from the Metis FIFO is either limited by the
> Ethernet connection or as fast as your PC can grab them :)
With the DSP panadaper data I request it on a timeframe that I think
gives the appearance of a continuous display, say 100ms so reducing the
load on the CPU to the minimum necessary. This data is sent regardless
but I guess I can time it to see what the period is.
> Metis wont request more samples from Mercury until its FIFO is empty so to
> keep things simple I did not think it necessary to include a sequence
> number.  It seems to work just fine this way in KISS Konsole.
>
> Hope that helps.
>
> 73 Phil...VK6APH
>
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>> ***** 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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