That topic doesn't seem relevant? It's about really fast signal generation, 10 MHz, while mine is about messaging at <2 MHz, currently in the ~700 kHz range.

Both lua and micropython are very big, for something like you describe I would use a smaller language like TCL or AWK. I have embedded Jim TCL before, and google shows a few embeddable AWK libraries, but can't say how they would work on the ESP.

Yes, the model I ordered was a Saleae16 clone. I'm a sw guy, little electronics experience - I thought that's just a digital oscilloscope, displaying things via usb instead of its own screen. What do you mean with FTM? Google results aren't helpful for that. What make you think that the signal is wr...

For my GPIO polling code, see the Unreliable GPIO topic. memw seems to have the potential to cause long delays, so I'd like to know the details of how long and when - even if there's enough headroom, minimizing variance is nice.

Is there info on all kinds of flushes and their delays? And what types of RAM are used by which components. E.g. if I don't use RTC anywhere, is there a possibility the wifi uses it "secretly", or some other component.

I couldn't find this info in any docs. How many cycles does memw take, on avg and in worst case? I found online that on esp8266 (where it's supposedly a nop) it takes two cycles. Then, are the reads on the APB/AHB bus (0x6000....) speculative like DPORT? IOW, could the memw be dropped for accesses v...

I'm seeing unreliable GPIO results on my esp32; apparently both reading and writing. About 1 in 30-100k reads/writes has the wrong result (a high bit read as 0, low bit read as 1, set bit or cleared bit not taking effect, etc). The board is rev1. Esp-idf is the 4.0 git branch. I've configured idf as...