[hpsdr] Metis

[Phil Harman]

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.

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 :)

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









> ***** 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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