add ARDUINO_ARCH_RTTHREAD to support RTduino

adafruit / Adafruit-GFX-Library

Adafruit GFX graphics core Arduino library, this is the 'core' class that all our other graphics libraries derive from

https://learn.adafruit.com/adafruit-gfx-graphics-library

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add ARDUINO_ARCH_RTTHREAD to support RTduino #460

Closed mysterywolf closed 1 month ago

mysterywolf commented 1 month ago

This PR is for supporting RTduino (RT-Thread RTOS for Arduino), which can let all Adafruit Arduino drivers can run upon RT-Thread RTOS, including Adafruit-GFX and screen drivers.

mysterywolf commented 1 month ago

@ladyada Could you take a review? Thanks

ladyada commented 1 month ago

ok!