Collision sensing in Marlin

[Carontes]

Hi, I'm wondering why the collision sensing feature is not available in the Marlin code. I'm talking about this part:

#define BD_SENSOR_CONTACT_PROBE // it uses nozzle collision sensing to probe while homing`

I can't see it in the bugfix-2.1.x version and it's a useful feature to have. I'm waiting for it. Thank you

[markniu]

Hi, you can find it here: https://github.com/markniu/MarlinPULL/blob/bugfix-2.1.x/Marlin/src/feature/bedlevel/bdl/bdl.cpp

[Carontes]

I see that also Marlin bugfix code has it but with much less lines of code

https://github.com/MarlinFirmware/Marlin/blob/bugfix-2.1.x/Marlin/src/feature/bedlevel/bdl/bdl.cpp

So my question is; which one works better for collision sensing? Is the one in Marlin bugfix a more simplified version (with missing parts) or does it can work properly? And if it works do I have to only add #define BD_SENSOR_CONTACT_PROBE // it uses nozzle collision sensing to probe while homing in configuration.h or is there something else to do?
Thank you for your support.

[markniu]

The official Marlin repo's version may not work properly for the contact probe. The code in my GitHub has been tested and as shown in this video: https://www.youtube.com/watch?v=DzmGyJNS9bY

[Carontes]

So I only have to replace the bdl.cpp with your version and the collsion sensing should work properly? Or do I have to modify something else in the official Marlin repo?