Re: Link type FlexRay

[Guy Harris <guy () alum mit edu>]

On Jan 19, 2016, at 9:35 AM, Guenter Ebermann <guenter.ebermann () googlemail com> wrote:

> I asked Hannes about DLT_FLEXRAY.
> He told me that they currently dont use pcap for FlexRay and have only
> used it in a limited scenario and that we are free to change the
> layout.
> The format represented the bitsream from the bus 1:1 without an
> additional header.
> The only deviation was the padding: the data was padded to align to 4
> byte boundaries.
>
> This is my suggestion for an extension:
>
> I want to extend the frame by a "measurement-header": This header is
> added by the measurement device. It contains one bit for the FlexRay
> channel (A or B), a "data-type" enumeration and error-flags.

OK, so the new format is that the frame begins with a measurement header, which is followed by the bitstream from the 
bus?

Is the bitstream from the bus padded in that fashion?

> From the Wikipedia article on FlexRay (the first of the ISO standards the article mentions costs CHF 118, so I'm not 
> going to buy them immediately):

        https://en.wikipedia.org/wiki/FlexRay

a frame consists of some framing bits at each end of the frame, with each octet in the frame containing 2 bits of 
per-byte framing followed by the 8 bits of the octet.  Would LINKTYPE_FLEXRAY/DLT_FLEXRAY frames include all of those 
bits?  If so, where does the padding appear?
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