I've been using this to get a smoothed idle count for each CPU. The reported number is typically around 2,000 - 20,000 or higher when everything is good. Under 1000 means there is not much idle time left. // Register a callback to be called from the specified core’s idle hook. // The callback should...

The doc for the dev board ... does it show how to get to the I/O pins? Which ones are available? It looks like they may have pre-assigned most/all of them. Three are hardwired to LEDs, another to a photodiode; you might wish they were available for the quad encoder, etc. If they bring out the serial...

from https://en.cppreference.com/w/cpp/language/static class X { static int n; }; // declaration (uses 'static') int X::n = 1; // definition (does not use 'static') you've declared it, but not defined it. Look at the end of the long line, undefined reference to `Class1::staticField1'

I've not used sscanf in a long time. It seems likely, based on the %x doc in https://linux.die.net/man/3/sscanf, Matches an unsigned hexadecimal integer; the next pointer must be a pointer to unsigned int that the uint8 values are being used as uint32 and one of them, at least, is clobbering whateve...

It sounds like you have some sort of dev kit https://www.espressif.com/sites/default/files/dev-board/ESP32-S2-DevKitM-1%20small_0.png Did you make a pcb to mount the dev kit on? Then you'd use either the 5V or 3.3V pin to power it. I used 5V supply like this for one project: https://www.digikey.com/...

I found https://www.reddit.com/r/esp32/comments/bwgn1q/how_to_power_a_lolin_d32_externally_from_a_dc/ which points to https://www.youtube.com/watch?v=yZjpYmWVLh8 which points out that there is an EN pin that can disable the regulator so you can supply 3.3V. You are right, the diagram is hard to foll...

Explanation of why 2 stop bits were needed for a mechanical TTY https://retrocomputing.stackexchange.com/a/631
Extra stop bit(s) might be needed to slow down a datastream, but it would be pretty unusual for hardware less than about 30 years old.

Please post back if you figure it out. Two things I found that might point you in the right direction:

https://superuser.com/questions/1664768 ... ng-work-on
https://docs.espressif.com/projects/esp ... _echo.html

I don't know about wemos/lolin, but the dev kit c shows a blocking diode between the laptop/usb supply and the EXT_5V pin. The usb 5V supply is frequently not enough amps to support wifi without an external 5V supply, so I've been using both supplies with the random devices I get from amazon. I'd be...

Should this be ? I believe realloc is hard to use correctly: https://stackoverflow.com/questions/907 ... se-realloc and I don't think I've ever used it.