netdev - Re: [RFC][PATCH] net: arinc429: Add ARINC-429 stack

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Date:	Mon, 2 Nov 2015 20:41:29 +0100
From:	Aleksander Morgado <aleksander@...ksander.es>
To:	Oliver Hartkopp <socketcan@...tkopp.net>
Cc:	Marc Kleine-Budde <mkl@...gutronix.de>,
	Marek Vasut <marex@...x.de>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	"David S. Miller" <davem@...emloft.net>,
	Wolfgang Grandegger <wg@...ndegger.com>,
	Andrew Lunn <andrew@...n.ch>,
	Andrey Vostrikov <andrey.vostrikov@...entembedded.com>
Subject: Re: [RFC][PATCH] net: arinc429: Add ARINC-429 stack

On Mon, Nov 2, 2015 at 12:14 PM, Oliver Hartkopp <socketcan@...tkopp.net> wrote:
>
> What about defining some overlay data structure to map ARINC-429 frames into
> CAN frames?
>
> E.g. we could write the ARINC 32 bit data completely into data[0..3] and
> additionally copy the 8 bit label information (or should it better be 10 bit
> including the Source/Destination Identifiers?) additionally into the can_id.

Note that the only bits which are always treated as non-data are the 8
label bits (well, and the parity bit #31). The 2 SDI bits (#8, #9) may
be used as data bits when a high resolution is needed, like Lat/Long
encoded in binary words 310 and 311. I wouldn't make any assumption on
what's on those 2 bits; i.e. they're not always "source/destination".

-- 
Aleksander
https://aleksander.es
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