linux-kernel - Re: About bittiming calculation result

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Message-ID: <4D50F75A.5040700@grandegger.com>
Date:	Tue, 08 Feb 2011 08:57:14 +0100
From:	Wolfgang Grandegger <wg@...ndegger.com>
To:	Tomoya MORINAGA <tomoya-linux@....okisemi.com>
CC:	socketcan-core@...ts.berlios.de, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: About bittiming calculation result

Hi Tomoya,

On 02/08/2011 02:27 AM, Tomoya MORINAGA wrote:
> On Tuesday, February 08, 2011 12:53 AM,  Wolfgang Grandegger wrote:
> 
>> BTW, it's always possible to specify optimized bit-timing 
>> parameters directly, e.g. the following seem better:
>>
>>    800000     60  12    4    4   4   3  793650  0.8% 80.0% 81.0%  1.2%
>>
>> You could set these with:
>>
>>   $ ip link set can0 type can \
>>     tq 60 prop-seg 12 phase-seg1 4 phase-seg2 4 sjw 4
> 
> I can confirm 800K comms works well using the above.

Cool, I got these magic values from a CAN hardware expert.

> I wish Can-core could calculate like above.

Me too! I also got some indication on how to improve our algorithm in
case the bit-rate does not match. Hope to find some time soon to work
on this issue.

>>> seg1/seg2/sjw/prop_seg must be more than 1 ?
> BTW, according to EG20T PCH data sheet, 
> CAN bit-timing parameters(BRP, Prop_Seg, Phase_Seg1, Phase_Seg2, SJW) must not be set 0.

OK, then please provide a patch setting tseg1_min to 2.

Wolfgang.
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