[BUG] TRONXY_CXY_446_V10 missing SERVO0_PIN for BLTOUCH

[ngarafol]

Did you test the latest bugfix-2.1.x code?

Yes, and the problem still exists.

Bug Description

I cannot get BLTOUCH working with the board since PD12 pin is used by E2 stepper and I even tried PD13. Bltouch requires SERVO0_PIN defined and normally it would be pin 6 of WIFI1 connector board has, but with X5SA-2E model apparently it is not PD12 nor PD13.
Configuration.zip

Bug Timeline

No response

Expected behavior

I would like that SERVO0_PIN for the board would be known :)

Actual behavior

I defined #define SERVO0_PIN PD12 but it turns out in X5SA-2E printer it is used by E2 stepper according to #23761 (comment)

Steps to Reproduce

No response

Version of Marlin Firmware

bugfix-2.1.x

Printer model

Tronxy X5SA-2E

Electronics

other than bltouch, all stock

LCD/Controller

No response

Other add-ons

No response

Bed Leveling

UBL Bilinear mesh

Your Slicer

Prusa Slicer

Host Software

None

Don't forget to include

• A ZIP file containing your Configuration.h and Configuration_adv.h.

Additional information & file uploads

No response

[ellensp]

#define SERVO0_PIN PB10 // this wifi pin has hardware PWM

There are 3 IO pins on the wifi port from what I can see

PG1 // chip select (Pin6)
PB11 // TXD (Pin5)
PB10 // RXD (Pin4) - TIM2_CH3

The wifi plug seems to be stock for esp-01 module

Note: the wifi is on UART 3, you must not set any SERIAL_PORT to 3 or it will conflict

[ngarafol]

Thanks for response @ellensp. I am using Pin4 for 5V, Pin6 for servo and Pin5 for GND. I believe I should set SERVO0_PIN to PG1 in that case, the one for pin6? Regarding serial ports, IIRC only port 1 is configured.

I followed this https://angryadmin.sesc.one/images/tronxy_wifi_pins.jpg from https://angryadmin.sesc.one/posts/tronxy-marlin/ (different revision of Chitu board, but still WIFI port should be the same).

[ellensp]

you cannot use any IO pin. PG1 does not support hardware PWM

[ngarafol]

With SERVO0_PIN PB10, it is still behaving the same. Rebooting on its own when idle, or when I try to do Auto Home, it would home X and Y but Z is not moving (Z axis alone can be controlled). It returns to main screen, prints STOPPED and reboots again :( On initial flashing bltouch seems to work because it deploys two times (probably self test). Any tips what I could check?

[ellensp]

first issue is https://www.antclabs.com/wiring says the bltouch needs 5v, and that ports supposedly only provided 3.3v
bltouch manual says input voltage 4.8 ~ 5.1 V I suspect it will not run reliably on 3.3

The cpu is also on 3.3v, if you draw to much current, the processor will reboot. bltouch can draw a max of 300mA

yes that is a power on self test.

Use gcode to test the probe pwm signal.

Eg deploy the probe M280 P0 S10
stow the probe M280 P0 S90

the s parameter is the pwm value 0-255

[ngarafol]

Hm, seems you are correct again, Checked lines on WIFI1 and indeed PIN4 is giving 3.3V instead of 5V ... Is there any other 5V line on the board or should I wire dc-dc stepdown somewhere else to get 5V?
Well, now that I think about it, better to wire dc-dc directly to PSU then, to stop stealing power from the board :)

[ellensp]

I don't think there is any 5v on that board, but board details are thin and the manufacturer is not helpful.
So all information is from 3rd parties...

[ngarafol]

I wired XL4005 to PSU directly, set it to output 5.1v. Connected BLtouch to it. But printer is still not ok. Rebooting and Z would not home at all.

[ngarafol]

@ellensp do you perhaps know what difference does it make to use pin7 for signal wire? I asked in FB group and one member said he used pin7 instead of pin 6, and following pins:

I used pin 4 for 5v, pin 2 (pb11) for z min, pin 7 (pb10) for servo0, and pins 1 and 5 for ground.