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Enable CS "active-high" device support - #1

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Enable CS "active-high" device support#1
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michthom-patch-1

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Reference adafruit/Adafruit_CircuitPython_BusDevice#71

Enables SPIDevice to be used for things like the Sitronix ST7920 LCD display which requires CS to be pulled high during commands or data transfers.

ST7920 LCD Display timing diagram

@michthom
michthom force-pushed the michthom-patch-1 branch 3 times, most recently from 4aefbf9 to a30930b Compare September 22, 2021 19:14
Reference adafruit/Adafruit_CircuitPython_BusDevice#71

Add a new parameter cs_active_value for devices that require CS to use "active high" logic.

Update mpconfigboard.mk to disable pyb_nano_v2 from core build as its flash is too small now.
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