Tricking TFT into thinking it has a nav unit connected

[Diogo Cardoso]

Hi there guys,

I've recently started my cabus "hacking" journey with two objectives, one is that I want to be able to decode wonder wheel/menu buttons and re-direct them to my phone running android auto and the other one was to make a built in gate opener to the bike, like if I press aand hold the menu up button one gate opens and If I press menu down the other one opens. My question is that if there's a way to trick the tft into thinking it has a nav unit plugged in (like chigee or touratech adapter) so that my menu up/down and wonder wheel actions don't reflect in the tft display. I don't mind if I have to put an Arduino or bridge two pins since I can do that inside my phone mount. Any information is appreciated.

Thanks in advance

[daniel armenta]

Hi, I don't know if you got it, according to this graph, pin 9 of 3.3v seems to be the one that controls that the adapter is in the base, it would have to be measured, presumably the unit will have to give 3.3v to that pin so that the electronics of the support indicate to the motorcycle that it has a support in place, I don't think that pin gives the 3.3v but that it receives them, it's all about measuring and testing...
Let me know...
Regards

[Aleksander Jerič (S55AJ)]

Diogo, that is a wonderful idea! I might use it too!
I landed here after searching DBC file, try making Arduino CANbus sniffer like I did. Also try ESP32 BT/Wifi serial bus redirecting to android. I can get all bits from wonder wheel, menu button, blinkers etc. You could make a combination to trigger gate opening etc. And you do not need NAV feature activated.

Hope it gives you

[Christopher Hemmings]

Hey Diogo, 

Ive recently had this exact same thought and have just came across your question. Did you end up figuring out how to trick the bike into thinking it had the GPS unit? I want to do the same thing with Android auto and using the control wheels to navigate the screen.

[Diogo Cardoso]

I just picked this project back up from the shelve, I tried to just power up the support with 3.3v and the bike showed no indications, I assume some communication will be needed on the UART pins but Ill see what I can figure out, for now I'm reading wonder wheel and other inputs from the dwa plug, I figured that long pressing the menu up/down buttons doesn't do nothing on the tft so I've mapped the long press instead of the simple click, for an "ok" button I chose the blinker cancel for the ok.

[Diogo Cardoso]

I've also switched to mapping the key presses as keyboard input to an android device since I'm now making a custom gps device using an android phone. I've gotten around the gate situation by installing a gps tracker in my motorcycle that automatically opens the gates for me when I get close (even better than the buttons). I wanted to disable tft input so that I could use up and down buttons with a single press instead of long press. 

[Bixio Rimoldi]

To trick TFT into thinking it has a nav, you need to implement a LIN slave that responds to IDs 2Dh and 28h (hexadecimal 2D and 28). Below I am giving the correct response. I have done it, to control my navigator app through the wonder wheel. However, the software of the bike must be "ready" for the nav. This is standard for bike that comes with the cradle, like a GS, but not for a sporty bike like the S1000R. Mine was not ready, and I had to ask the dealer to make a software update and check the corresponding feature. Once the bike is ready, and the LIN bus that feeds the Nav gets the correct responses, the TFT will show a blue TFT icon on the top left. When you make a long up press of the Menu button, the TFT icon changes to NAV.  At this point the LIN bus carries the signals of the wonder wheel, coded into the frame with ID 14h. 

Here the needed responses; 

Slave response to Master ID 2Dh: 01h 15h 15h 00h 00h 00h 00h 00h (8 bytes)

Slave response to Master ID 28h: FFh FFh FFh FFh FFh FFh 00h 00h (8 bytes)

My implementation uses an Arduino Nano ESP32 to implement the LIN slave, interpret the wonder wheel movements, and translate them into bluetooth commands (arrows up/down/left/right and enter) to control Scenic (the navigation app that I use and that works great for me). 

The LIN slave implementation is the one from Georg Icking-Konert https://github.com/gicking/LIN_slave_portable_Arduino

I intend to publish everything (the electrical circuit, the Arduino code, and the code for a 3D printer). I don't know yet in which forum and in which format I should make all this available. Suggestions are welcome.  

[Diogo Cardoso]

Awesome! I had my craddle optioned in from the factory (F900XR) so I believe I'm good there. To comunicate to the lin bus I will need to plug directly in to the cradle's plug on the bike or can I power up the craddle and send the messages trough UART? In regards to sharing everythin you've done I feel like you should create a github repo for it and then advertise it on forums or threads related to this. I'm building a "head unit" using an android phone and a custom 3d printed mount that slots in the craddlle. When I have everything finished I want to make it available as well.

[Bixio Rimoldi]

I suspect that the UART is the LIN, but I can't verify since I don't have a craddle. Thanks for the suggestion on publishing, it sounds like a good idea. 

[megah...@gmail.com]

Hi everyone,

I’m starting to build a device that will use LIN as an input, and I’d like to sniff signals such as turn indicators or any buttons pressed on the steering wheel/handlebar controls.

For some reason, I can’t get the NAV unit to connect directly to the TFT without the other motorcycle parts connected. I have connected the TFT LIN bus to the correct pin, and the NAV does respond. I checked it with a scope, and it does generate a message containing all 0x01, but the TFT does not recognize the NAV at all.

Has anyone successfully decoded the LIN messages on this system?

I’m mainly trying to find out whether the LIN bus carries data for turn signals or other handlebar button presses. On the motorcycle, the TFT shows values like speed, lean angle, fuel consumption, and general information. Once I get it working, I should be able to map the data to the exact locations, but for now I’m just trying to understand whether button data is sent over LIN.

It would be straightforward if this were on CAN, since I already know the relevant CAN ID, but I’m not sure how this is handled on LIN.

Any advice or decoded message examples would be appreciated !

[Bixio Rimoldi]

Hi,

The following project does (among other things), listen to the BMW “wonder wheel” and makes the bike “believe” that it has a nav. With small modifications you can have it print all the LIN bus messages.

Here the link: https://github.com/brimoldi/bmw-s-wonder-wheel-to-bluetooth

Sorry for brevity: I am on a bike tour of several weeks with only the iPhone to answer.

Bixio

[F Roman]

Yo ha conseguido encontrar en el can los comandos de encender y apagar, los leo en un arduino y activa y desactiva mi toma de accesorios. A la velta de vecaciones pondre por aqui esquemas y codigo arduino para el que lo quiera

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[George Chatzisavvidis]

hi  Bixio thanks for the   https://github.com/brimoldi/bmw-s-wonder-wheel-to-bluetooth ,   where did you connect the device? on can bus?