Unable to read tmc uart 'gear_stepper' register IFCNT

[cicinovec]

Hi,

I have just installed the ERCF with ERB v1.1 board, flashed the RP2040 with newest klipper:
mcu ercf(rp2040) Version: v0.11.0-241-gffb5105b Load: 0.00, Awake: 0.00, Freq: 12 MHz,

After I try to move with one of the motors, I always got this error (lines are from klippy.log):
`TMC gear_stepper failed to init: Unable to read tmc uart 'gear_stepper' register IFCNT

• DEBUG: Found tmc2209 on gear_stepper. Current control enabled
• DEBUG: Found tmc2209 on extruder. Current control enabled
• DEBUG: Loaded persisted ERCF state, level: 3`
  klippy (1).zip

Is the wrong hardware or do I miss somethink else in the config?

[cicinovec]

After long search this seems to be issue of Klipper, and not TMC driver

[relifram]

Is there a fix, or do you have a reference that shows that this is a Klipper problem instead of an ERB hardware issue?

[qwertymanzero]

I just updated and now have the same issue. Has anyone found a fix yet?

[relifram]

I just updated and now have the same issue. Has anyone found a fix yet?

I ended up just throwing it out. Turns out there's a lot more wrong with the design than just the complete failure of the microcontroller. The on board power supply is under powered too, so there's no point in actually using this board.

[redPanther]

I wrote code for the mellow fly micro. This is similar wired regarding tmc uart. As far as I understand it is not (easy) possible to have bidirectional half duplex uart com.
If they had connected rx and tx gpio pin with an 1k resistor and optimal to both rp2040 uart pins correctly - or form a multi address uart bus with both tmcs, then all nice things would be possible.
with that layout you can use unidirectional tx only uart. Then you could detect stall event via diag pin.

It's sad with little changes board could be great