Ender 3 V2 Marlin Compilation Error

Hey Guys,
following this tutorial (https://www.youtube.com/watch?v=neS7lB7fCww&t=993s) I downloaded Marlin from the bugfix 2.0.x branch on github.
Then (amongst other things) I changed line 115 to "#define SERIAL_PORT_2 3".

When trying to compile the following error will occur:


I hope someone can help.
Kind regards
DasJan

" I changed line 115 to "#define SERIAL_PORT_2 3""

Don't do this.

SERIAL_PORT and SERIAL_PORT_2 is for devices that understand gcode.

Your LCD does not understand gcode.

Your LCD is handled automatically on serial 3 using LCD_SERIAl_PORT

thank you
so what should I do?
Outcomment "Serial_Port_2"?

Yes

I totaly forgot to mention that i´m conneting a BLTouch.
Isn´t that a device that understands GCode?

no. you need to look at the interface of the device.

a bltouch is a PWM controlled device. (like a servo)

Sure you use g-codes to control it with marlin, but that is not the same thing.

all right
then it isn´t the firmware...
The BLTouch won´t extend, lights up but won´t extend.
Do you know anything about that?

there are 3 different ways to connect a BL Touch to the controller.

1) you can use the actual bltouch plug for both servo and endstop wires
2) you can use the bltouch plug for the servo wires and the z endstop for a bltouch endstop wires.
3) you can use a pin 27 board, you plug the servo cable into that board and the z endstop for a bltouch endstop wires.

which do you have? The firmware settings have to match your hardware setup.
also check the wiring is correct colour wise for where you plug it in. eg many pin 27 boards swap 2 pins over


I suspect you have 3, as that changes the io pin uses to send PWM commands to the bltouch or a wiring fault
.

Edited 1 time(s). Last edit at 01/19/2021 07:43PM by Dust.

I connected a Extention Bracket to the Display Cable where I connect the 3 Wires from the BL Touch (G,V,SIG).
The Two remaining wires are connected to the Z-Endstop Port.
When booting the Printer the BLTouch does his startup routine (Extends and retracts two times) so the Wires should be connected the right way.
When I try to auto home the printer the BLT won´t extend anymore and even pulling on the Probe won´t trigger the Z-Stop.

The default in marlin is to use option 1.

For option 3 you need to add "#define HAS_PIN_27_BOARD" to your Configuration.h
and make sure you have "#define Z_MIN_PROBE_USES_Z_MIN_ENDSTOP_PIN" enabled

This tell marlin your using the Pin 27 board and Z_endstop pins for your bltouch

Edited 1 time(s). Last edit at 01/20/2021 05:02AM by Dust.

Thank you so much!!
That was the solution.