Vida CEM swapping

Post by **RickHaleParker** » 09 Mar 2021, 15:19

MaxDenisov wrote: 09 Mar 2021, 15:07 I just thinking that Vitaliy is right, better to have dc/dc converter 12v-5v.
I had some difference/issues because of power supply and long wires

Are you using a twisted pair on the CAN BUSes ? The wire size, twist rate and other factors determines the impedance. CAN BUS performance can be sensitive to impedance mismatches. You might swipe some twisted pair out of a junker.

Post by **vtl** » 09 Mar 2021, 15:25

Someone needs to make a ready-to-use device that is designed properly, always works, does not require a laptop, and start selling it on ebay

MaxDenisov · Post by **MaxDenisov** » 09 Mar 2021, 15:28

RickHaleParker wrote: 09 Mar 2021, 15:19
MaxDenisov wrote: 09 Mar 2021, 15:07 I just thinking that Vitaliy is right, better to have dc/dc converter 12v-5v.
I had some difference/issues because of power supply and long wires
Are you using a twisted pair on the CAN BUSes ? The wire size, twist rate and other factors determines the impedance. CAN BUS performance can be sensitive to impedance mismatches. You might swipe some twisted pair out of a junker.

Yep, just put all lessons learned into PCB and OBDII connector direct on it to avoid cables.

MaxDenisov · Post by **MaxDenisov** » 09 Mar 2021, 15:28

vtl wrote: 09 Mar 2021, 15:25 Someone needs to make a ready-to-use device that is designed properly, always works, does not require a laptop, and start selling it on ebay

Powered by VTL ))

Post by **vtl** » 09 Mar 2021, 15:40

MaxDenisov wrote: 09 Mar 2021, 15:28 Powered by VTL ))

There were lot more people involved than anticipated. With one of the shadow hat guys I had probably a 200+ emails long conversation, who gave me a good starting kick. Not sure I would be able to show any progress at all without all that CEM guts knowledge.

Christian added a P1 platform support.

Marc added support for a lot of Teensy variations, wrote code for the built-in CAN controllers, which seems to become a mainstream configuration now and organized the chaotic code. And also reformatted the code in camelCase, which drives me nuts, but, eh, whatever

A few dozens of folks reported their works/not works, that also helped immensely in steering the algorithms and building a knowledge base of why that thing can be broken, so we can help new folks better.

I'm actually very proud of how this project went on! A superb example of opensource power.

zajcis · Post by **zajcis** » 10 Mar 2021, 01:27

Has anyone tried cracking CEM of P1's facelift, which is based on 1M84E processor?
I use Teensy 4.1 with external CAN controller at the moment, but this is what it gives me:

Calculating bytes 0-2
1000 pins in 663 ms, 1508 pins/s, average response: 26
[ 00 -- -- -- -- -- ]: Failed assertion 'averageReponse >= AVERAGE_DELTA_MIN' in crackPinPosition() line 923.

How to deal with it?

MaxDenisov · Post by **MaxDenisov** » 10 Mar 2021, 05:20

Pin for my XC90 added to Vdash:

jcdillin · Post by **jcdillin** » 10 Mar 2021, 08:22

MaxDenisov wrote: 10 Mar 2021, 05:20 Pin for my XC90 added to Vdash:

Still waiting for mine to get updated

jcdillin · Post by **jcdillin** » 10 Mar 2021, 08:23

First prototype built, just waiting for my SWD programmer to load the bootloader onto the chip.

Once verified it can crack i'm going to work on another version that includes ODB connector and LCD.

Post by **vtl** » 10 Mar 2021, 08:37

Nice! Are you going to do code changes yourself to support that new CPU platform?