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docs: Note to enable SPI in RPi_microcontroller.md (#4503) 

whilst this line is in Measuring_Resonances.md, users following this guide for other reasons have no cause reason to read that and don't have an explanation for what they didn't know they didn't do.

Signed-off-by: Rowland Straylight <rowlandstraylight@gmail.com>
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strayr 2021-07-26 01:34:00 +01:00 committed by GitHub
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@ -25,6 +25,10 @@ sudo cp "./scripts/klipper-mcu-start.sh" /etc/init.d/klipper_mcu
sudo update-rc.d klipper_mcu defaults
```
Enabling SPI
============
Make sure the Linux SPI driver is enabled by running sudo raspi-config and enabling SPI under the "Interfacing options" menu.
Building the micro-controller code
==================================