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vtl / volvo-cem-cracker

Volvo central electronic module pin cracker via OBD for P1, P2 and P3 platforms
GNU General Public License v3.0
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Add the ability to use sub-microsecond latency units. #14

Closed cmolson closed 2 years ago

cmolson commented 2 years ago

I added the ability for the latency to be sub-microsecond. I found with a setting of 4 (0.25us) I was able to crack both 8690719 and 8690720 CEMs that I have here on my bench.

The default is still set to 1, so there should be no noticeable change. I think it is worth it for people with the P1 CEMs like mine to try this out.

cmolson commented 2 years ago

After further investigation, the only part of the change that made this work was:

/ maximum time to collect our samples / limit = TSC + 2 1000 clockCyclesPerLatencyUnit();

Which ended up limiting the timeout in cem_unlock.

I will close this and we can come up with a more appropriate change.