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From: Wolfgang Grandegger <wg@grandegger.com>
To: Tomoya MORINAGA <tomoya-linux@dsn.okisemi.com>
Cc: socketcan-core@lists.berlios.de, netdev@vger.kernel.org,
	linux-kernel@vger.kernel.org
Subject: Re: About bittiming calculation result
Date: Tue, 08 Feb 2011 08:57:14 +0100	[thread overview]
Message-ID: <4D50F75A.5040700@grandegger.com> (raw)
In-Reply-To: <93C12206407640199DCDD3A89A333F13@hacdom.okisemi.com>

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.

  reply	other threads:[~2011-02-08  7:55 UTC|newest]

Thread overview: 53+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
     [not found] <cover.1296818921.git.segoon@openwall.com>
2011-02-04 12:23 ` [PATCH 01/20] mach-omap2: mux: world-writable debugfs files Vasiliy Kulikov
2011-02-04 20:09   ` Tony Lindgren
2011-02-04 12:23 ` [PATCH 02/20] mach-omap2: pm: world-writable debugfs timer files Vasiliy Kulikov
2011-02-04 20:10   ` Tony Lindgren
2011-02-04 22:53   ` Kevin Hilman
2011-02-04 12:23 ` [PATCH 03/20] mach-omap2: smartreflex: world-writable debugfs voltage files Vasiliy Kulikov
2011-02-04 20:10   ` Tony Lindgren
2011-02-04 22:54   ` Kevin Hilman
2011-02-07  5:33     ` Menon, Nishanth
2011-02-04 12:23 ` [PATCH 04/20] mach-ux500: mbox-db5500: world-writable sysfs fifo file Vasiliy Kulikov
2011-02-04 12:23 ` [PATCH 05/20] leds: lp5521: world-writable sysfs engine* files Vasiliy Kulikov
2011-02-04 12:23 ` [PATCH 06/20] leds: lp5523: world-writable engine* sysfs files Vasiliy Kulikov
2011-02-04 12:23 ` [PATCH 07/20] video: sn9c102: world-wirtable " Vasiliy Kulikov
2011-02-04 15:29   ` Mauro Carvalho Chehab
2011-02-04 20:28   ` Luca Risolia
2011-02-04 12:23 ` [PATCH 08/20] mfd: ab3100: world-writable debugfs *_priv files Vasiliy Kulikov
2011-02-18 17:01   ` Vasiliy Kulikov
2011-02-04 12:23 ` [PATCH 09/20] mfd: ab3500: world-writable debugfs register-* files Vasiliy Kulikov
2011-02-04 12:23 ` [PATCH 10/20] mfd: ab8500: " Vasiliy Kulikov
2011-02-04 12:23 ` [PATCH 11/20] misc: ep93xx_pwm: world-writable sysfs files Vasiliy Kulikov
2011-02-04 12:23 ` [PATCH 12/20] net: can: at91_can: " Vasiliy Kulikov
2011-02-04 12:42   ` Kurt Van Dijck
2011-02-04 21:06     ` David Miller
2011-02-07 11:38       ` About bittiming calculation result Tomoya MORINAGA
2011-02-07 12:00         ` Wolfgang Grandegger
2011-02-07 15:52           ` Wolfgang Grandegger
2011-02-08  1:27             ` Tomoya MORINAGA
2011-02-08  7:57               ` Wolfgang Grandegger [this message]
2011-02-08  1:09           ` Tomoya MORINAGA
2011-02-08  3:29             ` Bhupesh SHARMA
2011-02-08  4:11               ` Tomoya MORINAGA
2011-02-04 12:23 ` [PATCH 13/20] net: can: janz-ican3: world-writable sysfs termination file Vasiliy Kulikov
2011-02-04 21:06   ` David Miller
2011-02-04 12:23 ` [PATCH 14/20] platform: x86: acer-wmi: world-writable sysfs threeg file Vasiliy Kulikov
2011-02-04 12:23 ` [PATCH 15/20] platform: x86: asus_acpi: world-writable procfs files Vasiliy Kulikov
2011-02-04 12:53   ` Corentin Chary
2011-02-04 12:24 ` [PATCH 16/20] platform: x86: tc1100-wmi: world-writable sysfs wireless and jogdial files Vasiliy Kulikov
2011-02-04 12:24 ` [PATCH 17/20] rtc: rtc-ds1511: world-writable sysfs nvram file Vasiliy Kulikov
2011-02-04 12:24 ` [PATCH 18/20] scsi: aic94xx: world-writable sysfs update_bios file Vasiliy Kulikov
2011-02-04 12:24 ` [PATCH 19/20] scsi: iscsi: world-writable sysfs priv_sess file Vasiliy Kulikov
2011-03-13  8:28   ` Mike Christie
2011-02-04 12:24 ` [PATCH 20/20] fs: ubifs: world-writable debugfs dump_* files Vasiliy Kulikov
2011-02-06 15:16   ` Artem Bityutskiy
2011-02-21 11:42 ` [PATCH 00/20] world-writable files in sysfs and debugfs Samuel Ortiz
2011-03-12 20:23 ` Vasiliy Kulikov
2011-03-14 22:18   ` [Security] " Andrew Morton
2011-03-15  2:26   ` James Bottomley
2011-03-15  3:09     ` [Security] " Greg KH
2011-03-15 11:50       ` James Bottomley
2011-03-15 14:18         ` Greg KH
2011-03-15 14:25           ` James Bottomley
2011-03-15 16:08         ` Vasiliy Kulikov
2011-03-15 16:32           ` James Bottomley

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