Pin Distribution

Note

• This page lists the pin distribution of the FLY-ERCF V2 toolboard after flashing the Klipper firmware. The pin numbers are based on the product schematic.
• UART/CS is the driver communication pin: it serves as UART when using TMC2209 and as chip select CS when using SPI drivers; the same pin is multiplexed.
• EN is the enable pin, which is typically active low in Klipper configuration (with a ! prefix in enable_pin).

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Driver Pins

Driver	STEP	DIR	EN	UART/CS	Endstop
DRIVER0	gpio4	gpio3	gpio5	gpio2	-
DRIVER1	gpio7	gpio8	gpio6	gpio9	-

Endstops

Function	Pin
Endstop Port 0	gpio20
Endstop Port 1	gpio15

Servo

Function	Pin
Servo 0	gpio21

Expansion Output

Function	Pin
EXTRA / General Purpose Output	gpio14

PWM

PWM Function	Pin
Servo 0	gpio21
EXTRA / General Purpose Output	gpio14