"TMC connection error" with TMC2209 drivers

Hello,
I have home made 3D printer, Ramps board with latest 2.0.4.4 Marlin release and Bigtreetech TMC2209 drivers on X and Y axis. I am able to move axis, but UART connection don't work. "TMC connection error" is shown on LCD all the time.

I checked all connections multiple times, ask for support on FB page, seeking for solution on internet but infortunately, after one month, I still didn't manage to solve it. So I am asking you for some help.

Regards,
Luka

Why didn't you include all the information?

For anyone looking see the following for many more details
[github.com]


Please take a picture on how you have it all wired up on the ramps. high enough res that we can see where you have plugged in the wires.

Edited 1 time(s). Last edit at 03/11/2020 12:31AM by Dust.

See attached images. 1K resistor is under shrinktube, connected to brown wire.

Regards,
Luka

Edited 1 time(s). Last edit at 03/11/2020 05:44PM by Lupek.

How are you powering the RAMPS? Via USB or via the main power supply? If you are powering via USB, how do you turn on the main power supply? If the USB power is provided before the main power the driver initialization will fail and you'll have to execute M501 to reinitialize the drivers once main power is applied.

Also, ensure that there are no jumpers installed under the drivers. For TMC2209 the jumpers that set micro steps for other drivers instead are used to set an address for the 2209. If the jumper setting does not match the setting of X_SLAVE_ADDRESS, Y_SLAVE_ADDRESS,etc in Configuration_adv.h then the driver won't respond to the UART data. The default for the addresses is 0 which means no jumpers.

It is powered with 12V power supply from old PC. I meassureed also voltage directly on TMC driver, pins VM and GND and it was 12.2V. All jumpers below TMC drivers are removed on X and Y axis, where I use TMC drivers. But I keeppt them on Z, E1 and E2 where A4988 are used. All slave adresses are set to "0"

Could anyone with more knowledge about UART comunication explain me how this comunication works? I meassured signal on TX and RX port with analog 20MHz osciloscope and all I see is just constant 5V voltage. What is normal comunication frequency? Should driver and arduino comunicate all the time or just from time to time? I am quite suspicious that there is some mistake in arduino program.

Regards,
Luka

With a ramps it just communicates on setup or if you request information via gcode

Thanks. This was very usefull information. I measured signal on TX port when M122 was executed and I see some signal. Therefore at least TX seems to work properly.

Edited 1 time(s). Last edit at 03/14/2020 03:38PM by Lupek.

I still didn't manage to solve this issue. As mentioned in previous post, I am now sure that TX port gives signal. Next step would be to check if driver gives any signal. If I meassure signal with osciloscope, and grab pint head in order to skip few steps. Should I see signal on driver druring step skipping?

I received the same error. I had chosen tmc2208 and received The same error. It got me thinking, Try the tmc2208 standalone (or something like that) and it WORKED. No more connection errors. I guess that if they don't have some extra connection they are considered stand alone.

In standalone mode TMC connection error disappear also in my case. But as far as I know, UART connection is disabled in standalone mode and except hidden error message, main issue still remains.

Regards,
Luka