<html><head><meta http-equiv="Content-Type" content="text/html; charset=utf-8"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; line-break: after-white-space;" class="">Despite working on this on-and-off for a month, I can’t find the root cause. The MCP2515 just seems to randomly get overloaded, and stop receiving, but the flags don’t Indicate it in any reliable way.<div class=""><br class=""></div><div class="">I have just committed a change to try to workaround this:</div><div class=""><br class=""></div><div class=""><ol class="MailOutline"><li class="">Introduce a watchdog reset count in the status for each can bus.</li><li class="">Introduce a watchdog timer that tracks the time the last message was received.</li><li class="">If the car is OFF, the watchdog timer is simply reset once every ten seconds.</li><li class="">If the car is ON, and the watchdog timer indicates no messages received for 60 seconds (or longer), the bus is reset (turned off and on). An error is logged to record this, and the status counter incremented.</li></ol></div><div class=""><br class=""></div><div class="">That should go out to EDGE release tonight. It is already in my car, but that only fails once every week or so.</div><div class=""><br class=""></div><div class="">Regards, Mark</div><div class=""><br class=""><div><blockquote type="cite" class=""><div class="">On 16 Aug 2018, at 7:05 PM, Mark Webb-Johnson <<a href="mailto:mark@webb-johnson.net" class="">mark@webb-johnson.net</a>> wrote:</div><br class="Apple-interchange-newline"><div class=""><meta http-equiv="Content-Type" content="text/html; charset=utf-8" class=""><div style="word-wrap: break-word; -webkit-nbsp-mode: space; line-break: after-white-space;" class="">The mcp2515 issues are probably different than esp32can, but similar logic can probably be used to address them both.<div class=""><br class=""></div><div class="">After a week in my car with three buses running, can2 locked up today. Here is the status:</div><div class=""><br class=""></div><blockquote style="margin: 0 0 0 40px; border: none; padding: 0px;" class=""><div class=""><div class=""><font face="Andale Mono" class="">OVMS# can can2 status</font></div><div class=""><font face="Andale Mono" class="">CAN: can2</font></div><div class=""><font face="Andale Mono" class="">Mode: Active</font></div><div class=""><font face="Andale Mono" class="">Speed: 500000</font></div><div class=""><font face="Andale Mono" class="">Interrupts: 40069</font></div><div class=""><font face="Andale Mono" class="">Rx pkt: 40429</font></div><div class=""><font face="Andale Mono" class="">Rx err: 0</font></div><div class=""><font face="Andale Mono" class="">Rx ovrflw: 0</font></div><div class=""><font face="Andale Mono" class="">Tx pkt: 0</font></div><div class=""><font face="Andale Mono" class="">Tx delays: 0</font></div><div class=""><font face="Andale Mono" class="">Tx err: 0</font></div><div class=""><font face="Andale Mono" class="">Tx ovrflw: 0</font></div><div class=""><font face="Andale Mono" class="">Err flags: 0x01000001</font></div></div><div class=""><font face="Andale Mono" class=""><br class=""></font></div><div class=""><div class=""><font face="Andale Mono" class="">OVMS# can can3 status</font></div><div class=""><font face="Andale Mono" class="">CAN: can3</font></div><div class=""><font face="Andale Mono" class="">Mode: Active</font></div><div class=""><font face="Andale Mono" class="">Speed: 125000</font></div><div class=""><font face="Andale Mono" class="">Interrupts: 5003600</font></div><div class=""><font face="Andale Mono" class="">Rx pkt: 5003610</font></div><div class=""><font face="Andale Mono" class="">Rx err: 0</font></div><div class=""><font face="Andale Mono" class="">Rx ovrflw: 0</font></div><div class=""><font face="Andale Mono" class="">Tx pkt: 0</font></div><div class=""><font face="Andale Mono" class="">Tx delays: 0</font></div><div class=""><font face="Andale Mono" class="">Tx err: 0</font></div><div class=""><font face="Andale Mono" class="">Tx ovrflw: 0</font></div><div class=""><font face="Andale Mono" class="">Err flags: 0x01000001</font></div></div></blockquote><div class=""><div class=""><br class=""></div><div class="">CAN3 was operating normally. Flags identical.</div><div class=""><br class=""></div><div class="">I fixed this with:</div><div class=""><br class=""></div></div><blockquote style="margin: 0 0 0 40px; border: none; padding: 0px;" class=""><div class=""><div class=""><div class=""><font face="Andale Mono" class="">OVMS# can can2 start active 500000</font></div><div class=""><font face="Andale Mono" class="">Can bus can2 started in mode active at speed 500000bps</font></div><div class=""><font face="Andale Mono" class=""><br class=""></font></div><div class=""><font face="Andale Mono" class="">OVMS# can can2 status</font></div><div class=""><font face="Andale Mono" class="">CAN: can2</font></div><div class=""><font face="Andale Mono" class="">Mode: Active</font></div><div class=""><font face="Andale Mono" class="">Speed: 500000</font></div><div class=""><font face="Andale Mono" class="">Interrupts: 831</font></div><div class=""><font face="Andale Mono" class="">Rx pkt: 831</font></div><div class=""><font face="Andale Mono" class="">Rx err: 0</font></div><div class=""><font face="Andale Mono" class="">Rx ovrflw: 0</font></div><div class=""><font face="Andale Mono" class="">Tx pkt: 0</font></div><div class=""><font face="Andale Mono" class="">Tx delays: 0</font></div><div class=""><font face="Andale Mono" class="">Tx err: 0</font></div><div class=""><font face="Andale Mono" class="">Tx ovrflw: 0</font></div><div class=""><font face="Andale Mono" class="">Err flags: 0x01000001</font></div></div></div></blockquote><div class=""><div class=""><br class=""></div><div class="">No need to power on/off.</div><div class=""><br class=""></div><div class="">For mcp2515, I’ll try to add a ‘kick’ function able to try to read the status registers and restart as appropriate. That should give us more information.</div><div class=""><br class=""></div><div class="">Regards, Mark.</div><div class=""><br class=""><blockquote type="cite" class=""><div class="">On 16 Aug 2018, at 4:58 PM, Tom Parker <<a href="mailto:tom@carrott.org" class="">tom@carrott.org</a>> wrote:</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=""><p class="">On my Leaf the bus seems to stop quite often, so the reset would
have to operate quite often too. Perhaps increment a metric when
the reset fires so we can monitor how often it is happening?<br class="">
</p>
<br class="">
<div class="moz-cite-prefix">On 16/08/18 01:46, Mark Webb-Johnson
wrote:<br class="">
</div>
<blockquote type="cite" cite="mid:70C03BEE-CA3B-43D4-8283-816DD46F64DE@webb-johnson.net" class="">
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" class="">
Sorry, forgot to mention: another option is to poll the bus
manually if an interrupt hasn’t been received in N seconds. Check
the status registers and if everything is not perfect then reset
the controller.<br class="">
<div class=""><br class="">
<blockquote type="cite" class="">
<div class="">On 15 Aug 2018, at 9:45 PM, Mark Webb-Johnson
<<a href="mailto:mark@webb-johnson.net" class="" moz-do-not-send="true">mark@webb-johnson.net</a>>
wrote:</div>
<br class="Apple-interchange-newline">
<div class="">
<meta http-equiv="Content-Type" content="text/html;
charset=utf-8" class="">
<div style="word-wrap: break-word; -webkit-nbsp-mode: space;
line-break: after-white-space;" class="">This was my worry
for both esp32 can and mcp2515. We get an interrupt, but
for some reason the status is not showing anything to do,
so we return from the interrupt. Then, the status changes.
Or, for a particular status we had to do something that we
didn’t. The bus is locked up, and the interrupt never
fires again, so we never get called. I wonder if we just
fired the interrupt handler again manually, would it
recover?
<div class=""><br class="">
</div>
<div class="">When this happens, do we need to power off
then on the can bus, or is a ‘can canX stop’ ‘can canX
start …’ sufficient?</div>
<div class=""><br class="">
</div>
<div class="">Perhaps a general solution would be a
watchdog. If the CAN bus does not receive anything for N
seconds (perhaps 60), then restart the controller? We
could simply protect it from restarting twice (a simple
check of the counters), so worse case this would restart
once 60 seconds after a bus normally went idle. Or is
that too kludgy?</div>
<div class=""><br class="">
</div>
<div class="">Regards, Mark.<br class="">
</div>
</div>
</div>
</blockquote>
</div>
</blockquote>
<br class="">
</div>
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