[ath9k-devel] Realtime plot of Spectral Scan in ath9k

[Gui Iribarren <gui@altermundi.net>]

On 07/25/2013 04:54 PM, Adrian Chadd wrote:
> Cool!
>
> Where's the web-side of things?
>
> I'd like to write a freebsd version of this and just share the same
> web UI for plotting.

Hey Adrian!
glad you liked it :D

i made fft_eval output JSON with that in mind. Later it can be optimized 
to save bandwidth, but for my first tinkerings, plain JSON is easier :)

>> i haven't wrapped up neatly the openwrt Makefile yet, or flot html/ json
>> cgi, but will do ASAP and send links

work in progress...
[as of this writing, still mising a trivial Makefile to make a proper 
openwrt package]

https://github.com/libre-mesh/lime-packages/tree/master/packages/spectral-scan-webgui

http://[2a00:1508:1:f002:6670:2ff:feed:f8da]/spectral_scan.html

San Piccinini is working on the waterfall view, consuming the same JSON

http://[2a00:1508:1:f002:6670:2ff:feed:f8da]/spectral_scan_waterfall.html

Gabriel Tolon has various measurement equipment, so i hope with this 
visualization he'll be able to better calibrate or find 
misintepretations of the source data :D

>>
>> plotting the whole spectrum is trivial (a single line of code) but hopping
>> takes longer (i see a 45ms gap between one freq and another, vs 1.5 ms
>> between samples on the same freq)

Turns out I didn't quite understand the meaning of the "tsf",
so those figures are crap,

A full pass over thirteen 2.4ghz channels on my hardware (iw wlan0 scan) 
takes about 75ms, so about 6ms per hop

(specifying "passive" only makes it take longer, funny)

have a nice day!

gui

>> and disrupts communications, so fps must
>> be lowered to about 0.3 to get a reasonable compromise between 1) temporal
>> resolution, and 2) being able to communicate to get the data.
>>
>> (unless, of course, you do like some propietary vendors who disable radios
>> during spectral scan views, which then you can only get through ethernet,
>> with mobile-unfriendly java software :P)
>>
>> Cheers!
>>
>> Gui
>>
>>