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Geir,<br>
<br>
can you please try this: locate the speed setup in mcp2515.cpp, it's
around line 115. Replace the setup for 100 KBPS by this:<br>
<br>
<tt> case CAN_SPEED_100KBPS:</tt><tt><br>
</tt><tt> //cnf1=0x03; cnf2=0xfa; cnf3=0x87;</tt><tt><br>
</tt><tt> cnf1=0x44; cnf2=0xe5; cnf3=0x83;</tt><tt><br>
</tt><tt> break;</tt><br>
<br>
Then try again.<br>
<br>
<br>
<div class="moz-cite-prefix">Am 30.12.2017 um 20:25 schrieb Geir
Øyvind Vælidalo:<br>
</div>
<blockquote type="cite"
cite="mid:330DDAC9-D6A4-4D11-B355-BA76E0FBACEB@validalo.net">
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
I don’t have anything connected to CAN3. I could try to use CAN3
instead of CAN2. It’s a long shot, but worth a try… I’ll look into
it tomorrow.
<div class=""><br class="">
</div>
<div class="">Geir<br class="">
<div><br class="">
<blockquote type="cite" class="">
<div class="">30. des. 2017 kl. 19:29 skrev Greg D. <<a
href="mailto:gregd2350@gmail.com" class=""
moz-do-not-send="true">gregd2350@gmail.com</a>>:</div>
<br class="Apple-interchange-newline">
<div class="">
<meta http-equiv="Content-Type" content="text/html;
charset=utf-8" class="">
<div text="#000000" bgcolor="#FFFFFF" class=""> Ha, I
thought 100k was a typo for 1000, sorry... Yeah, high
speed overflow shouldn't be an issue. On the other
hand, low speed means that the time to receive a frame
increases 10x, so that opens up a larger window if the
chip doesn't like being talked to when actively
receiving a frame. Perhaps there is some interaction
between the two sides of the chip? For example, are
there any registers that pertain to both busses? I only
use CAN3, with nothing connected to CAN2.<br class="">
<br class="">
Greg<br class="">
<br class="">
<br class="">
<div class="moz-cite-prefix">Geir Øyvind Vælidalo wrote:<br
class="">
</div>
<blockquote type="cite"
cite="mid:0BD0279E-952D-46D0-BDAF-21A24250CEC6@validalo.net"
class="">Thanks Greg. This can-bus is only 100kbit and
uses less than 10% of the available capacity. It is a
low speed, low traffic bus. And currently I don’t do
any transmitting on it.
<div class=""><br class="">
</div>
<div class="">I don’t see why it shouldn’t work for
me, then.</div>
<div class=""><br class="">
</div>
<div class="">Geir<br class="">
<div class=""><br class="">
<blockquote type="cite" class="">
<div class="">30. des. 2017 kl. 19:07 skrev Greg
D. <<a href="mailto:gregd2350@gmail.com"
class="" moz-do-not-send="true">gregd2350@gmail.com</a>>:</div>
<br class="Apple-interchange-newline">
<div class="">
<meta http-equiv="Content-Type"
content="text/html; charset=utf-8" class="">
<div text="#000000" bgcolor="#FFFFFF" class="">
For what it's worth, I've been using CAN3
for a long time with no lockups, running the
OBDII ECU code. What is different, perhaps,
is that all the interactions are at 500k
speed (vs 1000), and generally alternate one
frame receive, followed by one frame
transmit. So, overflow should never occur
unless the OBD2ECU code stops, at which
point I probably didn't care. Standard vs
extended has not been a factor, in case
that's a question.<br class="">
<br class="">
The only issue we had was that if you try to
transmit several frames back-to-back, the
third and subsequent frame sent were all
duplicates of the second frame. That was
fixed by adding a delay in the code, hoping
that it would be sufficient for the prior
frame to actually get sent. Seems to work,
though those frames are typically only sent
at startup (request of VIN or ECU Name), not
hammered on.<br class="">
<br class="">
Greg</div>
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