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

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Date:	Wed, 4 Nov 2015 16:19:45 +0100
From:	Aleksander Morgado <aleksander@...ksander.es>
To:	Vostrikov Andrey <andrey.vostrikov@...entembedded.com>
Cc:	Marek Vasut <marex@...x.de>,
	Oliver Hartkopp <socketcan@...tkopp.net>,
	Marc Kleine-Budde <mkl@...gutronix.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>
Subject: Re: [RFC][PATCH] net: arinc429: Add ARINC-429 stack

On Wed, Nov 4, 2015 at 4:18 PM, Vostrikov Andrey
<andrey.vostrikov@...entembedded.com> wrote:
>>> > About the parity -- can we add some flag into the datagram to indicate we
>>> > want hardware to calculate the parity for that particular datagram for
>>> > us? And we'd also need to indicate what type of parity. I dunno if this
>>> > is worth the hassle.
>>>
>>> This  is HW configuration property, it does not belong to  datagram. Also
>>> for TX channels,  parity could  be  two  kinds:  odd and even, for RX it
>>> is only on/off.
>
>> There are datagrams which do contain parity and ones which do not contain it,
>> correct ? Thus, it's a property of that particular datagram.

All ARINC words have bit #31 as parity bit; whether it's used or not
depends on the setup as Andrey says below.

> For   RX  side  it  is  both: datagram and HW (is it checked by receiver or not)
> But  for TX side it is HW property of transmitter, either OFF or ON (odd or even).




-- 
Aleksander
https://aleksander.es
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