Thanks Karl for the detailed response...will go through it. Just one query....will the spectral scan work in parallel with WiFi AP or WiFi CLient mode? What I mean is that when the WiFi chipset (AR92xx/AR93xx) is operating in AP or client mode, based on request from Linux userspace, it should also perform a scan of the spectrum and return the energy values. Thanks & regards Sandeep Suresh.
From: "k...@aspodata.se" <k...@aspodata.se> To: sandeep.sur...@yahoo.co.in Cc: ath9k-devel@lists.ath9k.org; linux-wirel...@vger.kernel.org Sent: Monday, 10 February 2014 3:11 AM Subject: Re: [ath9k-devel] How to prepare a 802.11 channel map with energy using ATH9K Sandeep: > This is regarding generating a 802.11 channel map with energy at > periodic intervals. That means from a WiFi CLient I would like to > query and retrieve the energy detected on each of the 802.11 > channel from the WiFi AP and prepare a map of it. This is > simillar/same as results available from a Site survey tool loke > "Fluxe based WiFi Air Check meter". That functionality would be welcome. A review about Fluke's air magnet is available at: http://www.enterprisenetworkingplanet.com/netsysm/article.php/3652756/AirMagnets-Spectrum-Analyzer-20.htm > Can anyone help me with the method and APIs available for the same? There are patches at e.g.: http://article.gmane.org/gmane.linux.kernel.wireless.general/102332/match=spectral+scan The last one I have seen is http://article.gmane.org/gmane.linux.kernel.wireless.general/117038/match=spectral+scan The wireless playground seem to be: http://wireless.kernel.org/en/developers/Documentation/git-guide git://git.kernel.org/pub/scm/linux/kernel/git/linville/wireless-testing.git The Atheros 92xx/93xx seems to support spectral scan: http://wireless.kernel.org/en/users/Drivers/ath9k/spectral_scan/ To enable it look at: http://wireless.kernel.org/en/users/Drivers/ath9k/debug Programs to test spectral scan with: https://github.com/simonwunderlich/FFT_eval/ https://github.com/LorenzoBianconi/ath_spectral I am testing this with the kernel at: http://turkos.aspodata.se/tmp/linux-image-3.12.8-i2-rt11_1_i386.deb and using the preocedure in FFT_eval/scan.sh I just got my first scan: http://turkos.aspodata.se/tmp/ath9k_first_scan I'm using a TP-Link TL-WDN4800 pcie card for testing. Regards, /Karl Hammar ----------------------------------------------------------------------- Aspö Data Lilla Aspö 148 S-742 94 Östhammar Sweden +46 173 140 57
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