For your consideration: Proof of concept ISR version

[malachib]

Hi guys, yesterday I put together just as the title says a functional prototype of the ISR flavor of this debouncing code

Find it here https://github.com/malachi-iot/esp32-button/blob/exp-isr-working1/src/button_isr.c

As a prototype, it lacks a number of important qualities such as:

• Crit section protection
• Configurability
• Optimization
• General cleanliness

However it does work well for my single button scenario. The general approach is a direct morph of the existing code. In essence:

1. Edge detection ISR notices incoming GPIOs and triggers a hardware timer ISR
2. Hardware timer does most of the familiar stuff you see in the RTOS task, but without an RTOS task

I don't love that we're essentially "ticking" in phase 2 as @X-Ryl669 pointed out in #15 . I'm undecided if it's worth the extra complexity for this approach vs an RTOS task. Undoubtedly this approach is leaner. I hurt my brain yesterday trying to "detickify" the thing, so screw it :)

I invite comment, discussion, approval or disapproval. If the general notion is liked, I will clean it up and make it production worthy and do a PR

Test code is here https://github.com/malachi-iot/esp32-button/tree/exp-isr-working1/test/interactive/isr