From: Ben Greear <greearb@candelatech.com>
To: Seowoo Jang <swjang@netlab.snu.ac.kr>, ath10k@lists.infradead.org
Subject: Re: How to access the CCA related operation
Date: Mon, 24 Aug 2015 09:32:32 -0700 [thread overview]
Message-ID: <55DB4720.1090106@candelatech.com> (raw)
In-Reply-To: <006a01d0de35$1bde70a0$539b51e0$@netlab.snu.ac.kr>
It is in firmware, and you cannot reliably poke it through the driver
read/write register API because each time the radio resets (channel change, etc), it is
liable to re-write the CCA registers back to default values.
There is a large list of registers with 'CCA' in the name, but I don't
know what they really mean, and I had hard time getting that info out
of QCA. If you have any better luck, please post whatever you can
share.
Thanks,
Ben
On 08/23/2015 11:21 PM, Seowoo Jang wrote:
> Hello,
>
> We are trying to evaluate our idea on 802.11ac protocol with Atheros qca9880
> / ath10k driver.
>
> We would like to be able to access/know the result of the CCA (clear channel
> assessment) operation
> or the level of interference on the carrier when we need.
>
> We have dug into the driver files and concluded that the CCA related values
> are likely
> in the firmware or on the registers of the hardware.
>
> And please correct us if we are thinking wrong.
>
> We would appreciate the help if someone can give us some starting points,
> such as the address of the register that stores the carrier sensing values
> (CCA values)
> or the result of it (whether the carrier is busy or idle), to investigate.
>
> The chipset we are using is compex WLE900VX-7AA.
>
> We are currently using Ubuntu 14.04.03 with kernel version 4.1.5,
> but we can use any versions of OS and kernel if they support 802.11ac
> bandwidth.
>
> Thank you for help in advance.
>
> -------------------------------
> Seowoo Jang, Ph.D.
> Ubiquitous Network Laboratory
> EECS, Seoul National University
>
> CEL +82-10-3723-3401
> E-mail swjang@netlab.snu.ac.kr
> -------------------------------
>
>
> _______________________________________________
> ath10k mailing list
> ath10k@lists.infradead.org
> http://lists.infradead.org/mailman/listinfo/ath10k
>
--
Ben Greear <greearb@candelatech.com>
Candela Technologies Inc http://www.candelatech.com
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next prev parent reply other threads:[~2015-08-24 16:32 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-08-24 6:21 How to access the CCA related operation Seowoo Jang
2015-08-24 16:32 ` Ben Greear [this message]
2015-08-24 16:35 ` Adrian Chadd
2015-08-24 17:31 ` Peter Oh
2015-08-24 18:20 ` Ben Greear
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