The microcontroller connects to the RPi's UART pins. It requires a UART that supports hardware flow control, so you have to do some configuration to make sure that's what's connected to the UART pins on the expansion connector (which may differ depending on which RPi you're using). Details of the protocol are here: https://github.com/lampmerchant/tashtalk/blob/main/documentation/protocol.md - let me know if there's anything I should add there.How does the hardware currently present itself to the system?
Odd... I did respond to that; I don't know why you didn't get the response (forum glitch???); and yes, you are on my spreadsheet. Also, in answer to your other question from that - I'm not using JLC's assembly services; I'm doing the soldering myself. JLC is the manufacturer of the bare PCBs, though.
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The secret is I'm using software I wrote myself. It's still got quite a few rough edges on it (undo is... somewhat unreliable) but it lets me lay out a simple board very quickly.Hurrah! I'm really impressed with the speed with which you've generated this hat. Millinery obviously your thing ;-)