ADAFRUIT.md add note about SPI baudrate.

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Peter Hinch 2021-01-28 07:07:27 +00:00
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@ -80,6 +80,9 @@ work. Note that the Pyboard hardware SPI supports only 10.5MHz and 21MHz.
In practice the 41ms update time is visually fast for most purposes except some
games.
Update: even with a PCB and an ESP32 (which supports exactly 20MHz) it did not
work at that rate.
## Power consumption
The power consumption of OLED displays is roughly proportional to the number