How to connect a BTT-MOT-EXP to an SKR Pro v1.1 and v1.2

Overview

BigTreeTech released the BTT-MOT-EXP. It is an adapter that would ordinarily allow 3 more extra drivers to be added to an SKR Pro v1.1 and v1.2. To allow a WiFi or SBC connection, some of those pins required. Luckily though, TeamGloomy have produced an adapter to allow the BTT-MOT-EXP to be connected and for 2 out of the 3 driver connections to be used.

BTT-MOT-EXP for WiFi Adapters
BTT-MOT-EXP for WiFi Adapters
BTT-MOT-EXP for older WiFi Adapters
BTT-MOT-EXP for older WiFi Adapters
BTT-MOT-EXP for SBC Adapters
BTT-MOT-EXP for SBC Adapters

Connecting the boards

A single 10-pin IDC cable is required between the WiFi/adaptor board and the board connected to the BTT EXP-MOT V1.0.
12/24v power should be connected to the BTT-MOT-EXP to power the drivers.
If using the drivers in UART mode, a jumper should be added to the pins underneath the driver as normal.

SKR Pro v1.1 and v1.2 Board.txt configuration

Please edit the stepper.numSmartDrivers in the board.txt file to 8 (assuming you have TMC2208, TMC2009, TMC2225 or TMC2226 drivers in all other sockets).

stepper.numSmartDrivers = 8

Please add the following lines to the board.txt.

stepper.enablePins = { F.2, D.7, C.0, C.3, A.3, F.0, D.11, G.7 }
stepper.stepPins = { E.9, E.11, E.13, E.14, D.15, D.13, G.3, G.2 }
stepper.directionPins = { F.1, E.8, C.2, A.0, E.7, G.9, D.10, G.6 }
stepper.TmcUartPins = { C.13, E.3, E.1, D.4, D.1, D.6, F.11, G.10 }

Config.g Modification

The two added drivers would become driver 6 and driver 7.
e.g.

M569 P6 S0
M569 P7 S0
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