[ath9k-devel] Spectral Scan in ath9k

[Alex Hacker <hacker@epn.ru>]

On Thu, May 31, 2012 at 07:58:11AM -0300, Saulo Queiroz wrote:
>    Alex,
>    I'm really new in the ath9k code.
>    May you give at least soure-code-related key words about that?
>    What should I look for in the code to get raw FFT?
>    Then, what may you point a reference about what procedure should be
>    performed in mathlab to decoded it?
>    thanks

Hi Saulo,
It's too long to describe all required code in detail but in short you need
to do the following.
1. Enable receiving of radar pulses in AR_RX_FILTER register.
2. Set some values in AR_PHY_SPECTRAL_SCAN. Do not miss both
AR_PHY_SPECTRAL_SCAN_ENABLE and AR_PHY_SPECTRAL_SCAN_ACTIVE bits.
3. Catch the rx descriptors with phy error 5 (on ar92xx) or 38 (on ar93xx).
You get several packets around 1500 bytes long with FFT data. About MatLab it
is joke of course, but it can be helpful in data analysis. :) For my eye it
looks like series of radar pulses.

Best wishes to you, let me know if you found something.
Alex.

> 
>    On 30 May 2012 07:25, Alex Hacker <hacker@epn.ru> wrote:
> 
>      Hi,
> 
>      It's easy to get raw FFT data from the card, but then some
>      cryptoanalytic work
>      should be done in MathLab. Actualy I'm busy (lazy) man... will wait for
>      open
>      information which Adrian promised. :) I beleave the open source
>      community can
>      implement these features better than MicroTik did it.
> 
>      Best regards,
>      Alex.
>      On Sat, Mar 24, 2012 at 03:53:40PM -0700, Adrian Chadd wrote:
>      > On 24 March 2012 08:50, Saulo Queiroz <ssaulojorge@gmail.com> wrote:
>      > > Hello,
>      > >
>      > > I intend to use ath9k to perform some tests on demodulated FFT
>      samples.
>      > > I found out the definition  #define AR_PHY_SPECTRAL_SCAN
>      > > 0x9910  /* AR9280 spectral scan configuration register
>      > > but since I am a beginner in the ath9k, I have no idea about using
>      it to
>      > > achieve my goal.
>      > >
>      > >  I really would be very grateful  if some can provide me with
>      informations
>      > > that help me to access such data in the code.
>      >
>      > Hi,
>      >
>      > People keep asking about spectral scan, bah. :-)
>      >
>      > There are some plans afoot to try and get this stuff opened and
>      > documented. Like anything, it's more complicated than "just provide
>      > register details", as it's not as easy as just flipping on some bits
>      > and getting FFT samples.
>      >
>      >
>      >
>      > Adrian
>      > _______________________________________________
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>    --
>    Saulo Jorge bq
>    -
>    "In theory, there is no difference between practice and theory, in
>    practice there is"
>    -- Someone
> 
> References
> 
>    Visible links
>    . mailto:hacker at epn.ru
>    . mailto:ssaulojorge at gmail.com
>    . mailto:ath9k-devel at lists.ath9k.org
>    . https://lists.ath9k.org/mailman/listinfo/ath9k-devel
>    . mailto:ath9k-devel at lists.ath9k.org
>    . https://lists.ath9k.org/mailman/listinfo/ath9k-devel

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