STEMMA Friend is also a UART Friend (with auto-baud detection)
The lil STEMMA Friend board we're working on this weekend could also be a cute lil UART/Serial monitor tool. the RP2040 has a fast enough GPIO peripheral that we can automatically detect baud rates and then turn on the UART peripheral to read data via an IRQ into a buffer. To get the nice scrolling effect (with a header at the top that doesn't scroll!) we have to use a framebuffer - thankfully the RP2040 also has enough RAM to buffer a full 240*240 pixels. we read the serial data and draw to the framebuffer in the IRQ and draw to the TFT itself in the main loop. We're testing it here with a…
The skinny
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