<html><head><meta http-equiv="Content-Type" content="text/html charset=utf-8"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" class="">This didn’t seem to work, so I made some further refinements. Documentation on MCP2515 datasheet is not very clear. From what I can tell, the receive registers are setup like this:<div class=""><br class=""></div><blockquote style="margin: 0 0 0 40px; border: none; padding: 0px;" class=""><div class=""><font face="Andale Mono" class=""><span style="font-size: 18px;" class="">Register Standard Extended</span></font></div><div class=""><font face="Andale Mono" class=""><span style="font-size: 18px;" class="">SIDH (0x61) 7:0 28:21</span></font></div><div class=""><font face="Andale Mono" class=""><span style="font-size: 18px;" class="">SIDL (0x62) 7:5 20:18, 17:16</span></font></div><div class=""><font face="Andale Mono" class=""><span style="font-size: 18px;" class="">EID8 (0x63) n/a 15:8</span></font></div><div class=""><font face="Andale Mono" class=""><span style="font-size: 18px;" class="">EID0 (0x64) n/a 7:0</span></font></div></blockquote><div class=""><br class=""></div><div class="">and the SIDL bit 3 (IDE) is 1 for extended and 0 for standard.</div><div class=""><br class=""></div><div class="">I implemented it like that, and it now seems to co-exists between the MCP2515 and ESP32 native CAN in both standard and extended modes. Of course, both implementations could now be wrong, but at least they match ;-) Need to try it out on something real, to be certain it is fixed now.</div><div class=""><br class=""></div><div class="">Regards, Mark.</div><div class=""><br class=""></div><div class=""><div><blockquote type="cite" class=""><div class="">On 10 Oct 2017, at 4:20 AM, Greg D. <<a href="mailto:gregd2350@gmail.com" class="">gregd2350@gmail.com</a>> wrote:</div><br class="Apple-interchange-newline"><div class=""><div class="">Hi folks, (Mark, in particular),<br class=""><br class="">I've tweaked the mcp2515.cpp code to support Extended CAN frames on CAN<br class="">2 & 3. Needed this for the OBD2ECU code, but it's there for anyone else<br class="">who may want it.<br class=""><br class="">Mark - I did a bit of this by trial & error, since some of what I was<br class="">doing wasn't working as I expected it would. Bits upside down, that<br class="">sort of thing... So I expect some of the middle bits around the three<br class="">frame flags is wrong, particularly on the transmit side, but for the<br class="">PIDs I use, the results I get match what Wireshark decodes. So, I think<br class="">it's close.<br class=""><br class="">Greg<br class=""><br class="">p.s. Got my first CAN 3 bus hang too... hope it's not related. :)<br class="">_______________________________________________<br class="">OvmsDev mailing list<br class=""><a href="mailto:OvmsDev@lists.teslaclub.hk" class="">OvmsDev@lists.teslaclub.hk</a><br class="">http://lists.teslaclub.hk/mailman/listinfo/ovmsdev<br class=""></div></div></blockquote></div><br class=""></div></body></html>