I started investigating the Raspberry Pi Pico RP2040 with the newly released Arduino mbed OS RP2040 boards core version 2.1.0.
The issues I experienced with SPI on the previous 2.0.0 version seem to be gone.
With just setting CONFIGURATION_OPTION to CONFIGURATION_EXT3_PICO_ARDUINO, the same sketch drives the Pervasive Displays e-ink screens throught the EXT3 extension board.
Read more at Connecting the EXT3 to the Raspberry Pi Pico.
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