Datasheet

Type “gfx” in the search field to quickly find the first library — Adafruit_GFX:
Repeat the search and install steps, looking for the Adafruit_ZeroDMA and Adafruit_ST7735 libraries.
After restarting the Arduino software, you should see a new example folder called Adafruit_ST7735 and inside, an
example called graphicstest.
In the graphicstest source code, look for the lines as follows:
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