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got the Teensy interface up and running. i'm using direct IO port access on the Teensy 4.1. take a look at core_pins.h in the Teensy header files. basically you can read from GPIOx_PSR and write to GPIOx_DR.
i also had to add a short delay to create some setup time for the FPGA--the Teensy 4.1 is a hair too fast lol
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