This is an opensource hardware/software project. It’s a DIY logic analyzer build around a raspberrypi pico.
With a pico2, you can achieve 400MHz sample rate.
Hardware is pretty simple, because, except the pico, they are only a few component (mostly level shifters).
A YT vid (they are many):
Under the hood: it’s been a while I am lurking at logic analyzer’s. But they are too expensive or they look too much like a cheap chinese thingie and my personal background is too light in that matter. But, I tend to believe that, with such a tool, I will better understand the under laying protocols (I2C, SPI, I2S …), the data formats, the timings and so on.
So, I think I will order a PCB (I’ve already got a pico in my drawer).