Marlin 2.0.x bugfix with TMC2209 - TMC Connection Error.

[dapostol73]

Hello, I recently tried upgrading to TMC2209 for my Thinker S V2. It works if I use the HEX file provide, however I need to compile my own to configure Filament Runout and BLTouch. However, when ever I do this, Marlin report "TMC Connection Error" on boot up. The stepper work, but using Sensorless homing fails. If I run GCode M122 I get the following.

Recv: Driver registers:
Recv: X 0x00:00:00:00 Bad response!
Recv: Y 0x00:00:00:00 Bad response!
Recv: Z 0x00:00:00:00 Bad response!
Recv: E 0x00:00:00:00 Bad response!
Recv:
Recv:
Recv: Testing X connection... Error: All LOW
Recv: Testing Y connection... Error: All LOW
Recv: Testing Z connection... Error: All LOW
Recv: Testing E connection... Error: All LOW

I've made sure I update the Thinker Rambo config to have setting for Serial and I'm not sure what else to try, help please.

If anyone want to take a look at the config files, they can use my repository here for bugfx 2.0.X
https://github.com/dapostol73/Marlin/tree/bugfix-2.0.x

[dapostol73]

Update: This the expected behavior for TMC2209 with Thinker V2 as outline in this document on GitHub for future reference.

https://github.com/Eryone/mega2560/blob ... r%20V2.pdf

[William]

We have also uploaded it here:
viewtopic.php?f=8&t=305