patagona<p>So, I think I can now claim to have the most complete CAN protocol documentation for the Huawei R48xx power supply/charger (with the exception of Huawei themselves maybe).</p><p>For this, I've gathered/summarized information from various forum posts, several implementations, blog articles, messing around myself and probably-should-not-be-public documentation.</p><p><a href="https://github.com/patagonaa/huawei-r48xx" rel="nofollow noopener" translate="no" target="_blank"><span class="invisible">https://</span><span class="ellipsis">github.com/patagonaa/huawei-r4</span><span class="invisible">8xx</span></a></p><p><a href="https://chaos.social/tags/r4850g" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>r4850g</span></a> <a href="https://chaos.social/tags/r4850" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>r4850</span></a> <a href="https://chaos.social/tags/CANHacking" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>CANHacking</span></a> <a href="https://chaos.social/tags/ReverseEngineering" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>ReverseEngineering</span></a></p>
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#canhacking
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LeoDJ<p>Fuck yeah! Finally got _any_ <a href="https://chaos.social/tags/CAN" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>CAN</span></a> output out of the <a href="https://chaos.social/tags/MHEV" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>MHEV</span></a> <a href="https://chaos.social/tags/BSG" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>BSG</span></a>!</p><p>I'm glad it actually was something stupid ^^<br>I did test it with and without 48V connected in the past, but apparently I neglected to connect the two GNDs (power and signal GND) together. <br>I did now and the behaviour changed completely. <br>It now draws 250mA instead of 11, goes into sleep (0mA) after 5s of no CAN activity and most importantly, spews out a bunch of messages after detecting any CAN activity, wohoo \o/</p><p><a href="https://chaos.social/tags/CANHacking" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>CANHacking</span></a></p>
LeoDJ<p>Trying to send some <a href="https://chaos.social/tags/CAN" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>CAN</span></a> messages to the <a href="https://chaos.social/tags/startergenerator" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>startergenerator</span></a> didn't prove successful either.<br>I'm not well versed in CAN, but the dongle just kept trying to send the single message on repeat.<br>So I guess it didn't receive a CAN ACK?<br>Afaik, all transceivers in a bus should ACK a frame, no matter if they're addressed or not.</p><p>Not sure why it didn't work. Maybe I was on the wrong baud rate or this device behaves weirdly and only sends ACKs after getting a magic message?</p><p><a href="https://chaos.social/tags/CANhacking" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>CANhacking</span></a> <a href="https://chaos.social/tags/carhacking" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>carhacking</span></a></p>
LeoDJ<p>Bought a <a href="https://chaos.social/tags/Mercedes" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>Mercedes</span></a> <a href="https://chaos.social/tags/48V" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>48V</span></a> <a href="https://chaos.social/tags/MHEV" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>MHEV</span></a> <a href="https://chaos.social/tags/startergenerator" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>startergenerator</span></a> for <a href="https://chaos.social/tags/reverseengineering" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>reverseengineering</span></a>. <br>The specs are impressive, especially for the price point of a few hundred euros.</p><p>- 48V / ~200A<br>- 12.5 kW peak<br>- 165 Nm peak</p><p>The main difficulty lies in finding out the <a href="https://chaos.social/tags/CAN" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>CAN</span></a> commands for initialization and control. </p><p>I don't have access to a Mercedes E200 EQ Boost (or similar), so "just sniffing" is out. <br>Maybe somebody could help me with that tho? ^^'</p><p><a href="https://chaos.social/tags/CANhacking" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>CANhacking</span></a> <a href="https://chaos.social/tags/carhacking" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>carhacking</span></a> <a href="https://chaos.social/tags/BSG" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>BSG</span></a></p>
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