eZ Navi Delete Project

ozyo

Any update?

radensb

Yes actually!

I was not able to put as much time into this as I wanted over the last few weeks due to other life and work responsibilities. Adulting is lame sometimes...

While playing with the code and trying to optimize the timing, I kept running into problems due to trying to dance around the limited resources and speed of the processor. I used an Atmega 328P (same device that Arduino uses for their basic platform) but kept away from the known poor preforming core library function calls to make the system as fast as possible. After much work, I got the system working reliably most of the time ... which is not good enough. The problem is that the 328P just isn't fast enough to run the code and filter out all the CAN messages on the Z's bus in time without using interrupts. Using interrupts fixed that problem but generated another by corrupting the timing of the dial control serial stream. When the dial worked, I would lose AC state CAN messages. There would be rolling blackouts for the needed CAN messages and the dial would not properly control the AC system. Basically, I needed one more hardware UART and I didn't want to move to a huge device to get it.

Soooooo..... I moved on to another controller platform! This new device is a 32-bit ARM processor running at over 4x the speed of the 328 with much, much more hardware resources (3x hardware UARTS)! I ported over the code and returned to interrupt driven CAN servicing. So far, everything looks good! I am no longer dropping CAN messages and the dial data is perfect 100% of the time.



Top right is the original design with the 328 from the vids I posted earlier. The new design is below with the purple PCB and little blue dev board under it with some sky-wires connecting them. Next to it is my Z-Simulator that blasts it with CAN messages to test robustness while everything is running. I also put on a wire harness connector so I can plug this into the car and test (coming soon). With the success I have currently with this new processing platform, I am about ready to spin up a new PCB that supports it.

The new design will support USB and Bluetooth, so +1 feature.

I bet its hardware is from the same OEM mfg in the Z (Calsonic Kansel). Hell, it might be the same system, or one that functions just like it! When I reverse engineered the Z dial module, I noticed that there is a ton of unused bits being communicated in the serial interface. I'll bet there is some proprietary protocol they made up for these systems and that space is reserved for other systems with more/different AC features (dual climate controls??). At the end of the day, my system is a CAN translator and could probably be adapted to work with other cars with a bit of code work...


Thanks for the interest!
More to come...

bigaudiofanat

I'd love to see something like this come out for the G37, the tesla style screen SUCKS. and the metra adapter is terrible.

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jchammond

I’m gonna read into this; I mostly miss my A/C controls & cubby hole from my Base/Touring...the dang smaller hvac controller is intertwined with the Navigation on the Sport Touring model
Seems like the fan is always on...

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aballard

I really, really can't wait for this to be 100%....

Bandit_Kaine

Can't wait for this!!!

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ayinxz

Subd


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Bandit_Kaine

If possible can you provide me/post your cardroid apk. I have tried for hours trying to compile it to no success.

P.S Nevermind, I was able to get it working right away on another computer.. Not sure why my work laptop had issues compiling it.

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aballard

Hows the progress coming along?
The anticipation is building......

bigaudiofanat

WHy not just do workshop 12's kit? Now I don't know if they can do the nav delete but I'm waiting for their G37 setup.

https://workshoptwelve.com/

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batman_4

Any update or is this thread dead?

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radensb

The Workshop 12 kit does not support the Navi AC system and I wanted an actual car stereo instead of a hacked headphone jack interface. Also, their software is ... not great.

Not Dead! I am still very much planning on working on this. I have put way too much effort in board designs and code. As an update to my last (August?.. Jesus) post, I received the new board spins, assembled them, blew out 2 of the 3 I made because I am special, and confirmed the hardware design on the 3rd. I have been using it in my car for months now. All of the functions are working, although there is still a few bugs in the CAN communication that cause mode selection to foul up and some unexpected AC behavior. It is very rare bug - the best kind... and I have ideas on how to address them.

Life events had hit pretty hard over the last few months along with a spiked work schedule, but I do look forward to getting back to completing this.

My Z has had the stereo removed since April 2019 because I was too lazy to to reinstall it for my 8 minute work commute, so that at the very least is constant motivation to get back at it soon.

bigaudiofanat

Actually I'm not going to be using their headphone jack. I'm going to plug their interface into a external DAC for the best possible audio. Not hacked up at all. They confirmed it'll work. I've played with their interface and it great IMO.

https://www.amazon.com/gp/product/B0...6SUAZA2P&psc=1

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NorthStyle

I second that. However, for the DAC be sure to check the power requirements. I'm running the NextDrive Spectra X and had to add a USB toggle since it would pull power from the tablet even when the car was off. But, the DAC increased the audio quality IMMENSELY over using just the 3.5mm...

Another thing, you'll also need a USB OTG hub and a 5pin OTG cable so you can use the DAC and have the tablet charge at the same time. I mine from Newegg (came from China thought).

bigaudiofanat

Workshop is selling the kit with a USB hub that should supply the right amount of voltage.

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