[Gusmanb] has tackled all of these problems with a simple analyzer built around the Raspberry Pi Pico. On the front and ... the software looks nice and even has an SPI protocol analyzer.

For example, once you get much over 250 MHz, the Pico’s SPI flash can’t keep up, so all the software you want to run has to be put in RAM first. You’ll also want to do some poking at the ...