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<p>Thank you Derek and Michael.</p>
<p>I'm running this firmware from today, and have driven the car 8 miles so far without issue.</p>
<p>Happy to run any useful diagnostic commands. In case it helps, the poller reports this.</p>
<p><code>OVMS# poller times status </code><br /><code>Poller timing is: off </code><br /><code>Type | count | Utlztn | Time </code><br /><code> | per s | [‰] | [ms] </code><br /><code>---------------+--------+--------+--------- </code><br /><code>Poll:PRI Avg| 0.99| 0.632| 0.065 </code><br /><code> Peak| | 0.733| 1.325 </code><br /><code>===============+========+========+========= </code><br /><code> Total Avg| 0.99| 0.632| 0.653 </code></p>
<p>Chris</p>
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<p id="reply-intro">On 2025-01-21 00:41, Derek Caudwell via OvmsDev wrote:</p>
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<div dir="ltr">Hi Chris
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<div>Here are the required changes, as I understand them, to be compiled into a new firmware from this thread: <a href="https://github.com/openvehicles/Open-Vehicle-Monitoring-System-3/pull/1102/files" target="_blank" rel="noopener noreferrer">https://github.com/openvehicles/Open-Vehicle-Monitoring-System-3/pull/1102/files</a></div>
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<div>Cheers</div>
<div>Derek</div>
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<div class="v1gmail_attr" dir="ltr">On Tue, 21 Jan 2025 at 10:48, Michael Balzer via OvmsDev <<a href="mailto:ovmsdev@lists.openvehicles.com" rel="noreferrer">ovmsdev@lists.openvehicles.com</a>> wrote:</div>
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<div>Chris,<br /><br />there is no prepared branch for these changes, as we still try to determine the best (most compatible) configuration.<br /><br />You need to apply the suggested changes manually to the current master.<br /><br />Regards,<br />Michael<br /><br /><br />
<div>Am 20.01.25 um 19:56 schrieb Chris Box via OvmsDev:</div>
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<p>I'm happy to try some new code on my Leaf. Which code should I use? The current master, or a different branch? It wasn't clear to me from the thread below.</p>
<p>Chris</p>
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<p id="v1m_3502584311878067824reply-intro">On 2025-01-19 19:47, Derek Caudwell via OvmsDev wrote:</p>
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<div dir="auto">I can't recall testing a later version but I think Chris can confirm he was on a later version when his Leaf had a similar problem.</div>
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<div dir="auto">The Leaf is now my wife's daily drive so I won't be able to take a look at making the suggested changes for a couple of weeks at least.</div>
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<div dir="ltr">On Mon, 20 Jan 2025, 8:31 am Michael Balzer via OvmsDev, <<a href="mailto:ovmsdev@lists.openvehicles.com" rel="noreferrer">ovmsdev@lists.openvehicles.com</a>> wrote:</div>
<blockquote style="margin: 0px 0px 0px 0.8ex; border-left: 1px solid #cccccc; padding-left: 1ex;">Derek,<br /><br />
<div>Am 03.05.24 um 12:53 schrieb Derek Caudwell via OvmsDev:</div>
<blockquote style="padding: 0px 0.4em; border-left: 2px solid #1010ff; margin: 0px;">When running <strong>firmware </strong><span style="color: #002200; font-family: ui-monospace,'Cascadia Mono','Segoe UI Mono',Hack,'Source Code Pro','Roboto Mono',Menlo,Monaco,Consolas,monospace; font-size: 13px;"><strong>3.3.004-74-gbd4e7196</strong> on my Nissan Leaf I suspect (but can't be 100% sure as it's only been 24h without fault) the new poller caused the car to throw the attached faults from overloading the can bus whilst driving. The fault was sufficient to send the car into limp mode and could not be driven until cleared with LeafSpy.</span></blockquote>
<br />Build 3.3.004-74 (released 2024-04-30) did not yet include the poller tracing control, i.e. it did lots of logging for frames, significantly affecting overall performance.<br /><br />Poller tracing control was introduced in <a href="https://github.com/openvehicles/Open-Vehicle-Monitoring-System-3/commit/7e4046042a99339d0212aac8f874cc8f780e634e" target="_blank" rel="noopener noreferrer">https://github.com/openvehicles/Open-Vehicle-Monitoring-System-3/commit/7e4046042a99339d0212aac8f874cc8f780e634e</a> on May 12.<br /><br />That commit was first included in build 3.3.004-103-g11fddbf6 released 2024-05-25. Do you remember testing that build or a later one?<br /><br /><br />But as I still don't understand how a software queue overflow could cause a bus crash, I've also checked the 500 kbit timing for the MCP2515 and found that may have the same issue as the 125 kbit timing:<br /><br />Our timing is:<br /><span style="font-family: monospace;"> case CAN_SPEED_500KBPS:<br /> cnf1=0x00; cnf2=0xf0; cnf3=0x86;<br /> = PROP=1, PS1=7, PS2=7, SJW=1, Sample 3x @56.3%</span><br /><br />Remember, the SAE/CiA recommendation is SJW=2, Sample 1x @87.5%. That would translate to:<br /><span style="font-family: monospace;"> PROP=5, PS1=8, PS2=2, SJW=2, Sample 1x @87.5% =<br /> cnf1=0x40; cnf2=0xbc; cnf3=0x81;</span><br /><br />I also checked the Arduino MCP_CAN lib, and that uses:<br /><span style="font-family: monospace;"> cnf1=0x40; cnf2=0xe5; cnf3=0x83;</span><br /><span style="font-family: monospace;"> = PROP=6, PS1=5, PS2=4, SJW=2, Sample 3x @75%<br /></span><br />So our timing for 500 kbit/s on the MCP buses also isn't as recommended.<br /><br />Derek, could you test the SAE/CiA recommendation and the MCP_CAN config as shown? Or anyone else with a live can2/can3 bus at 500 kbit?<br /><br />If these work, the question is which is the more general setup we should adopt. Apparently the MCP_CAN lib also does not follow the CiA recommendation, I wonder if the MCP_CAN config is a compromise for compatibility.<br /><br />Regards,<br />Michael<br /><span style="font-family: monospace;"></span></blockquote>
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