ESP32 ADC non-blocking library

[Bootalito]

I created an easy library for the ESP32 arduino toolchain to read the ADC, average up to 1,000,000 samples, linearize it (because the integral non-linearity is horrible), all with non-blocking code.  The pieces to make a fully functional non-blocking analogRead were already a part of the ESP32 arduino toolchain, I just put the puzzle together, added averaging, and a means to calibrate it (linearize), and packaged it.

The code arbitrates the ADC in a round-robin or token fashion, so you can instantiate the library for however many GPIO pins you need as ADCs, and a Global token takes care of who gets to use the ADC

https://github.com/terryjmyers/analogReadNonBlocking

[thm_w]

Your code doesn't prevent taking more than 1,000,000 averages and overflowing the average summing variable

Nice work.

[Geoff_S]

Isn't there a possibility of a race condition ?  I've only briefly looked at your code, but it looks like it:
1. checks to see if a token is available,
2. if it is, it starts an ADC conversion
3. AND THEN increments the token counter.

What's to stop another instance also starting during step 2 ??