Am 18.02.2014 15:45, schrieb Diego Bernardes: > Hi, > > I have one question about hardware timestamp in Atheros chipsets. > From a post in Wireshark community, the chipset AR9287 can do hardware > timestamp. > > The question is, how accurated this timestamp is? The precision is in > nanoseconds, but what accuracy i can expect? > > My main need is the implement a good precision TDOA algorithm. > > I don't know jack about driver development, but is something > that interests me. If the accuracy is low, can i improve it in driver or > firmware? > If its possible, i can even trade reception packet speed for a better > accuracy in timestamp. > > The other question is, what is the difference between the ath9k_htc and > carl9170 drivers? Both support the AR9287 (from the debian wiki).
carl9170 firmware works on ar9170 CPU and so far i know there is no ar9170+AR9287 devices. Major difference between this two drivers: ath9k_htc shares bigger part of RX and some other hw related code with ath9k. I hope it will be more then this :) carl9170 firmware was rewritten from scratch. ath9k_htc firmware is not rewritten :) > Thanks for all > > Links: > > Wireshark community: > http://ask.wireshark.org/questions/28683/recommended-wireless-adapter-usb-with-linux-wireshark-that-reports-mactime-in-radiotap-header > > Debian Wiki ath9k_htc: https://wiki.debian.org/ath9k_htc > > Debian Wiki carl9170: https://wiki.debian.org/carl9170 > > > _______________________________________________ > ath9k-devel mailing list > ath9k-devel@lists.ath9k.org > https://lists.ath9k.org/mailman/listinfo/ath9k-devel > -- Regards, Oleksij
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