How to config LV7829 driver as extruder?

General Discussion
1

Basic Information:

Printer Model: Diy Printer
MCU / Printerboard: Big Treetech SKR v1.4
Host / SBC
klippy.log

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Hello to all.

Can someone tell me how to config my LV7829 driver as extruder?
I did search this forum but no entry’s found.
I did search the internet outside this forum but also no information about my problem.

In the first place i did use the example config for my SKR V1.4 and did read the documents and filled the config for my needs.
But the missing part is the setup for the LV7829.
Other steppers types are in the config but not mine.
I did setup the extruder with all the options for my needs.
But the driver option is not there.

For example i did try the following but that generates an error in klipper.
########################################

TMC2208/LV8729 configuration

########################################

[tmc2208 stepper_x]
uart_pin: P1.10
run_current: 0.523
stealthchop_threshold: 999999

[tmc2208 stepper_y]
uart_pin: P1.9
run_current: 0.523
stealthchop_threshold: 999999

[tmc2208 stepper_z]
uart_pin: P1.8
run_current: 0.523
stealthchop_threshold: 999999

[lv8729 extruder]
uart_pin: P1.4
#run_current: 0.800
#stealthchop_threshold: 999999

[tmc2208 stepper_z1]
uart_pin: P1.1
run_current: 0.523
stealthchop_threshold: 999999

I hope someone can point me to the right direction about this?

Thanks.
klippy.zip (7.7 KB)

2

Hello @alcomys !

It appears that the LV7829 has no UART mode, so you cant use it like a TMC 22xx driver.

It’s a standalone driver like the DRV8825 and the A4988

3

Hello EddyMI3D,

Thanks for the replay.
But can you tell me how klipper does know which driver i use in the E0 slot?
And do i have only define Drivers that use UART? is that what you mean?

Thanks

4

The drivers are assigned with the [stepper] config:

https://www.klipper3d.org/Config_Reference.html#stepper

In your case you leave the UART [TMCxxxx] stuff away.

5

Hello EddyMI3D,

Thanks for your help, I understand how it works now :slight_smile:

So this topic can be closed if needed.