Got out my ice40 UP5k board for the first time in quite awhile. An oddity of this board compared so some of the other ice boards is the FTDI bus isn't broken out to pins for RS-232. This is a feature I like to have for communication and debugging purposes.

Last time, I added a verilog uart and connected it the board to a DB9 -> USB adapter. Today, I decided to try out the board's HW SPI interface instead. Took most of the day to get it working, but works nicely now and saves a cable and LUTs!

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