Re: Flexcan - timestamp from message buffer to userspace

[Martin Kozusky <mkozusky@kkmicro.cz>]

Dne 18.10.2013 11:56, Martin Kozusky napsal(a):
> Hello,
> is there any official way how to read timestamp from flexcans message
> buffer?
> I see there is a macro defined FLEXCAN_MB_CNT_TIMESTAMP in flexcan.c,
> but not used.
> I would modify function flecan_read_fifo like
>
> + u32 timestamp = FLEXCAN_MB_CNT_TIMESTAMP(reg_ctrl);

sorry, u32 should be just u16

> but what to do with timestamp variable next and how to read it in
> userspace? :) I could change structure can_frame and add  u32 timestamp
also u16, not u32

> into it, but it wouldn't be very nice hack I think.
>
> BTW: is timestamp read with SO_TIMESTAMP  actualy taken when CAN message
> arrives?
>
> Thanks,
> Martin
>