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Portable serial terminal

Portable serial terminal, based on an RP2040 with a Gherkin keyboard and an ILI9488 screen.

A portable serial terminal based on an RP2040 dev board, with some hopefully reusable bits of code:

A 6x13-pixel antialiased bitmap font.
A small but full-featured terminal emulator.

A matrix keyboard driver with tap/hold functions.
An ILI9488 SPI LCD driver.

* A PIO serial interface.”

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