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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. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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