Endstops not working on SKR v1.1 board

General Discussion
1

Hi,

I got an SKR mini v1.1 E3 DIP board. With 2209 drivers.
Wanted something small, since this is going to be in my small delta. Previously used Duet 2 wifi (excellent board) - without any issues. With Klipper. So I thought - how hard can this be.

I am unable to make the end-stops work , for some reason they do not respond .
Everything is configured and wired per spec.

I’m bit miffed as to what did I get wrong.

The board: pin out

Here’s the most relevant part of the config:


[mcu]
serial: /dev/serial/by-id/usb-Klipper_stm32f103xe_36FFDC054158303226681657-if00 

#175
[printer]
kinematics: delta
max_velocity: 700
max_accel: 3000
max_z_velocity: 500
minimum_z_position: 0
delta_radius: 105
print_radius: 100

[stepper_a]
step_pin: PC6
dir_pin: !PB15
enable_pin: !PC7
endstop_pin: ^PC1

microsteps: 16
rotation_distance: 40
homing_speed: 20
homing_retract_dist: 5
homing_retract_speed: 10
second_homing_speed: 2
position_endstop: 220
arm_length: 215
angle: 210

[tmc2209 stepper_a]
uart_pin: PC10
run_current: 1.000
sense_resistor: 0.051


[stepper_b]
step_pin: PB13
dir_pin: !PB12
enable_pin: !PB14
endstop_pin: ^PC0
angle: 330
microsteps: 16
rotation_distance: 40

[tmc2209 stepper_b]
uart_pin: PC11
run_current: 1.000
sense_resistor: 0.051

[stepper_c]
step_pin: PB10
dir_pin: !PB2
enable_pin: !PB11
endstop_pin: ^PC15
angle: 90
microsteps: 16
rotation_distance: 40
angle: 90

[tmc2209 stepper_c]
uart_pin: PC12
run_current: 1.000
sense_resistor: 0.051
2

Looks like this has been resolved. 2209 have two pins that had to be cut.
No information on this in docs.

3

Hello @greggj !

Where did you get that value from:

Referring to this, it is 0.110 Ohms

https://learn.watterott.com/silentstepstick/comparison/

BTW, this is the default value in Klipper.

And: What two pins?