AnHardt

The SKR PRO has 4 SPI busses. One to the onboard SD-reader that is connected to pins able to be used as SPI1 - but currently used in software SPI...

The `REPRAP_DISCOUNT_FULL_GRAPHIC_SMART_CONTROLLER` has two SPI busses. One for the SD-card and one for the ST7920 disply driver. Usually the SD-SPI is driven by a hardware SPI buss. On the SKR...

https://www.panucatt.com/Re_ARM_for_RAMPS_p/ra1768.htm https://github.com/MarlinFirmware/Marlin/issues/10640#issuecomment-388699863

Concentrate to the thermal settings. Having them wrong causes a KILL what causes the loss of communication. Messing with the serials will not have any positive effect.

Neither nor. This part of Marlin was never ported to 3.3V processors. This module needs 5V to work - 3.3V is not enough. It also will produce up to 5V...

The Tx connectors are made for comparing a thermistors **resistance** to a on-board 4K7 pull-up resistor. The E3d Pt100 amplifier Boards have an proportional to the temperature **voltage** at their...

> do i need to remove pull up resistor? You could - but using any of these ADC-pins is much easier. 

Try ```diff + #ifndef BOARD_NAME - #define BOARD_NAME "BIGTREE SKR Pro 1.1" + #define BOARD_NAME "BIGTREE SKR Pro 1.1" + #endif ``` in 'pins_BIGTREE_SKR_PRO_V1.1.h'.

All that pins have 3.3V - not 5V. There are no 5V pins on this board. You could use all these pins with a level shifter to 5V, or the...

Two of the BL-Touch pins are ground (GND).