Could it perhaps be because the clock frequency actually is different? Not sure how you set it in the arduino environment, but in esp-idf, you can set it using 'make menuconfig' and by default it is set to 160MHz.

You can look at build/[your-project-name].map to see what the memory use is. The file is kind-of dense, but it gives your all the info you should need. In your case, dram0.bss is too big, so search for the line that starts with '.dram0.bss'. Here, you'll find all variables that are stashed in this r...

Sure, but WS and BCLK are an order of magnitude slower than the MCLK signal. Can you show me these signals on the same scope setup? I'm still not sure your noise comes fromt he ESP32 and not your setup; it looks distinctly analog and rlc-based to me.

I think, then, that this is a good point in time to close this thread. Everyone seems to have been able to make their point here and I believe most if not all qualifying ESP32 development boards have been mentioned, so I would say the original question has been answered to close to the largest exten...

'Unable to feed task watchdog'? Is this a literal quote?

If you mean that the task watchdog times out on your idle task, it is normally because you have one thread that hogs the CPU, not allowing other tasks (specifically, the idle task, which is watched by the task watchdog) to run.

We will be releasing it eventually, but don't expect it within days - last thing I heard there were still some minor kinks to be worked out of the board.

If the task runs at unpredictable times, why would you put in a watchdog at all?

Are you sure the noise is in the output on the GPIO and not your measuring system? You can easily get stuff like this if your probes bandwith is too low, you use pigtails off the probe pin, or your ground isn't in the right position.

This is because you have an (uininitialized) statically allocated variable that is too large. It has nothing to do with malloc or heap_alloc_caps, those aren't looked at at compile time.

Do you have other connections to your WROOM32 module?