In theory, it can be quicker (less pressure on the flash cache) and uses less flash memory. It's in ROM anyway, why not use it?

I think the DAC mode is one of the odd ones that uses BCLK as the latch clock. All other parallel modes seem to use WS for that. Not entirely sure; I can't really ask the hw people at this moment.

Fyi, it seems the I2S driver has a bug in DAC mode: the sample rate it sets is actually 8 times the sample rate you tell it to use. I have a bug fix in the internal merge queue, it will probably be merged after the holidays.

Sorry, as is the audio PLL still is not documented. I also do not know if it's possible to route its output directly to a GPIO.

Moved to the Arduino forum.

I think the compiler sees you're doing nothing with the result of i and j, and happily optimizes away the entire loop; the time will then mostly come down to the printf() which is bound for all processes by the serial port speed. Make one or both variables volatile, and you should have a more effect...

Aye, sure, obviously we'll make any correction algorithm we come up with as small as possible. Big-ass table if needed, simple math if possible. We also want to see if there are any effects with changing supply voltage, temperature, or specific chip, so the end result may get somewhat more complicat...

Seems vTaskEndScheduler actually is a stub; it just disables all interrupts, marks the scheduler on the core as not-running and returns. This should work, unless you decide to enable interrupts somewhere later in your routine again: that would also enable the tick interrupt as well, and with the sch...

Fyi, the way we are going to fix this is by adding calibration curves to the ESP32. The idea is to have a lookup table or function that maps each ADC value to the value it should be. That should help with the linearity, at the cost of maybe a bit or two of precision. Not much we can do in software a...

Actually, a critical section would be a pretty nice way to achieve this. Basically, this is how it should work: static portMUX_TYPE my_spinlock = portMUX_INITIALIZER_UNLOCKED; void my_task(void *arg) { while(1) { if (start_communication) { portENTER_CRITICAL(&my_spinlock); //Do all your timing-criti...