> Does it actually send an ACK to the bus or ignore the missing ACK?
The controller sends the ACK to the bus.
> | Setting the introduced flag via netlink should make CAN controller
> | perform a successful transmission, even if there is no acknowledgement
> | (dominant ACK bit) received.
> Does that answer your question?
This partially answers my question because in this case, the ACK is still transmitted.
-- Stéphane
De: Marc Kleine-Budde
Envoyé: Vendredi 04 novembre 2022 12:03
À: Stéphane Grosjean
Cc: linux-can@xxxxxxxxxxxxxxx
Objet: Re: presume-ack option exact meaning
On 04.11.2022 10:56:16, Stéphane Grosjean wrote:
> Hello all,
>
> I have searched the net, but I can't find a clear explanation of what
> the "presume-ack" option available in socket-can is.
>
> Some PEAK-System devices offer an option called "self-ack" which
> allows the controller sending the frame to also send the ACK itself.
Does it actually send an ACK to the bus or ignore the missing ACK?
> Does this behavior correspond to what the "presume-ack" option should
> enable?
>
> Thank you all for your help and regards,
In
| https://lore.kernel.org/all/1404934273-19233-3-git-send-email-nebaruzdin@xxxxxxxxx
Nikita Edward Baruzdin writes:
| Most CAN controllers have a support for ignoring ACK absence. Some of
| them refer to this feature as a self test mode (e. g. SJA1000) and some
| include it as a part of a loopback mode (e. g. MCP2510).
|
| Setting the introduced flag via netlink should make CAN controller
| perform a successful transmission, even if there is no acknowledgement
| (dominant ACK bit) received.
Does that answer your question?
Marc
--
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