ChrGri

You will find the flashing instruction here: https://github.com/bigtreetech/BIGTREETECH-S42B-V1.0/blob/master/3d%20printer%20-ender3%20closed%20loop%20driver%20module%20installation%20instructions.pdf Please let us know, whether your controller design was an improvement.

Same issue on my side with 2 motors + 2 OLED screens

Ok that's a reasonable idea. To start it, here is my thought: For investigation purposes, I would like to turn of everything depth related and just visualize the plain optical...

@SuGlider Thank you very much. I understood, that to enter the download mode on a regular ESP, one has to execute a specific DTR/RTS [sequence](https://electronics.stackexchange.com/questions/473443/esp32-dev-board-dtr-rts), as shown below . From...

> > However, simultaneous USB HID and serial output while RTS/DTR sates beeing const. are still buggy and both stall after some time. Single output of serial data or single...

One thing which helped a lot, was adding a delay between the serial write and USB HID output command, as such . Wit that delay, the serial and USB HID...

> I understand that your project uses USB OTG and TinyUSB for both, HID and CDC. The delay seems to give TinyUSB some room to run different tasks from those...

Just want to report that 2.0.17 behaves identical.

@SuGlider I dont want to bother you, but is there something I can do to accelerate the investigation? Btw. I see serial stall even with deactivated HID output after longer...

Thank you @SuGlider You already explained the RTS/DTR logic above. The remaining issue is, that the serial output stalls after a while, see https://github.com/espressif/arduino-esp32/issues/9582#issuecomment-2095318759 I initially thought that serial transmission...