From: Wolfgang Grandegger <wg@grandegger.com>
To: Mohamed HAMZAOUI <requinham@gmail.com>
Cc: Linux-CAN <linux-can@vger.kernel.org>
Subject: Re: [SocketCan] Problem of accuracy
Date: Mon, 09 Jul 2012 13:40:54 +0200 [thread overview]
Message-ID: <4FFAC346.7060201@grandegger.com> (raw)
In-Reply-To: <CABMxt4jLRKz8xKNbH3Qa=P0k1aEjMsqmo2vArGDo2O1Wf0=wGQ@mail.gmail.com>
Please do not drop the CC to the Linux-CAN mailing list...
On 07/09/2012 01:25 PM, Mohamed HAMZAOUI wrote:
> I think that is caused by Socketcan. Maybe, the nannosecond sleep is
> correct but when the system call write on a CAN socket it takes 0.3 ms
> to inject the data on the bus
>
> |_______________________________|_____________|
> nannosleep 1000µs call 300µs real sending time
>
> It's this possible and if this is true can i assume a fix 0.3 ms in
> all my period ?
Even if it takes 0.3ms to get the message out to the bus, it should not
change the period if you program clock_nanosleep() properly (waiting on
the next 1ms period).
Wolfgang.
next prev parent reply other threads:[~2012-07-09 11:40 UTC|newest]
Thread overview: 29+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <CABMxt4ijuTMYFYXx0n4AYBO6-=SRD0U3F4BTA2=rWE80Z4-yOA@mail.gmail.com>
2012-07-05 8:38 ` Problem of accuracy Oliver Hartkopp
2012-07-07 10:02 ` [SocketCan] " Mohamed HAMZAOUI
2012-07-07 10:32 ` Wolfgang Grandegger
2012-07-08 19:43 ` Mohamed HAMZAOUI
2012-07-08 20:13 ` Wolfgang Grandegger
2012-07-08 20:30 ` Mohamed HAMZAOUI
2012-07-09 7:18 ` Wolfgang Grandegger
2012-07-09 8:14 ` Mohamed HAMZAOUI
2012-07-09 8:20 ` Wolfgang Grandegger
2012-07-09 9:19 ` Mohamed HAMZAOUI
2012-07-09 9:22 ` Wolfgang Grandegger
[not found] ` <CABMxt4jnztXqAmLFcBnqp3001QXds1nX3xA2y_ka=xCNr0cjjA@mail.gmail.com>
[not found] ` <4FFAB09F.6090800@grandegger.com>
[not found] ` <CABMxt4jLRKz8xKNbH3Qa=P0k1aEjMsqmo2vArGDo2O1Wf0=wGQ@mail.gmail.com>
2012-07-09 11:26 ` Fwd: " Mohamed HAMZAOUI
2012-07-09 11:40 ` Wolfgang Grandegger [this message]
2012-07-09 11:57 ` Mohamed HAMZAOUI
2012-07-09 12:15 ` Wolfgang Grandegger
2012-07-09 13:19 ` Pavel Pisa
2012-07-09 14:29 ` Mohamed HAMZAOUI
2012-07-09 14:35 ` Mohamed HAMZAOUI
2012-07-09 14:40 ` Kurt Van Dijck
2012-07-09 14:57 ` Alexander Stein
2012-07-09 15:39 ` Mohamed HAMZAOUI
2012-07-09 17:08 ` Oliver Hartkopp
2012-07-09 20:50 ` Wolfgang Grandegger
2012-07-10 22:11 ` Mohamed HAMZAOUI
2012-07-11 12:35 ` Mohamed HAMZAOUI
2012-07-11 22:22 ` Wolfgang Grandegger
2012-07-11 22:19 ` Wolfgang Grandegger
2012-07-09 6:55 ` Kurt Van Dijck
[not found] ` <1341488146.2416.9.camel@slaptop>
2012-07-05 13:57 ` [Socketcan-users] back to back can frames Kurt Van Dijck
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