BTT EXP-MOT with MKS Robin E3D

[tanjunior]

I wanted to add 1 additional stepper driver to my MKS ROBIN E3D so that I can do Z_TILT.

E3D UART mode MOT-EXP UART mode E3D EXP1 <-> EXP-MOT EXP1 E3D EXP2 <-> EXP-MOT EXP2

Following the BTT EXP-MOT user guide and cross referencing with the E3D pins

BTT-MOT EXP2 M1STP = E3D EXP2 PB15 (klipper alias EXP2_6) BTT-MOT EXP2 M1DIR = E3D EXP2 PB0 (klipper alias EXP2_5) BTT-MOT EXP2 M1EN = E3D EXP2 PC10 (klipper alias EXP2_7) BTT-MOT EXP1 M1RX = E3D EXP1 PA7 (klipper alias EXP1_6)

[stepper_z1]
step_pin: EXP2_6
dir_pin: !EXP2_5
enable_pin: !EXP2_7
microsteps: 16
rotation_distance: 8
endstop_pin: ^PC6
endstop_pin: probe:z_virtual_endstop

[tmc2209 stepper_z1]
uart_pin: EXP1_6
run_current: 0.8
stealthchop_threshold: 999999

[board_pins]
aliases:
    # EXP1 header
    EXP1_1=PC1, EXP1_3=PA4, EXP1_5=PA6, EXP1_7=PC4, EXP1_9=<GND>,
    EXP1_2=PC3, EXP1_4=PA5, EXP1_6=PA7, EXP1_8=PC5, EXP1_10=<5V>,
    # EXP2 header
    EXP2_1=PB14, EXP2_3=PB11, EXP2_5=PB0,  EXP2_7=PC10,  EXP2_9=<GND>,
    EXP2_2=PB13, EXP2_4=PA15, EXP2_6=PB15, EXP2_8=<RST>, EXP2_10=<NC>,
    # CR_EXP3 header - additional header dedicated to Creality Ender 3/5 stock screens
    CR_EXP3_10=<5V>, CR_EXP3_8=PA4, CR_EXP3_6=PA6, CR_EXP3_4=<RST>, CR_EXP3_2=PC3,
    CR_EXP3_9=<GND>, CR_EXP3_7=PA5, CR_EXP3_5=PB0, CR_EXP3_3=PB11,  CR_EXP3_1=PC1

FORCE_MOVE STEPPER=stepper_z1 DISTANCE=10 VELOCITY=5