Hi everyone, I habe a problem with an interrupt in a class. I tried several variants to write the code but i always get errors. I use a ESP32 and I want to get a interrupt when pin 36 changes its state. Below is my actual code and i get the error: invalid conversion from 'void ()(void)' to 'void (…

Try this: #include "Arduino.h" #include "FunctionalInterrupt.h" class TestClass { public: TestClass(uint8_t pin) { attachInterrupt(digitalPinToInterrupt(pin), std::bind(&TestClass::classIsr, this), RISING); } private: uint32_t count = 0; void classIsr() { count++; } }; TestClass testObj…

Yes a member function does not make much sense without the context of the member (this) being set upon executing the function. The interrupt process has no clue about this context and that’s why you need to find a way to access the context from within the interrupt… Alternatively you can use a cla…

[image] J-M-L: hence my view there is nothing to win in trying to bind to a member function, just use a regular function and be done with it. I can think of several instances where being able to assign a instance function as a callback would be advantageous. Mainly because it enhances Encapsu…

[image] gfvalvo: I can think of several instances where being able to assign a instance function as a callback would be advantageous. Mainly because it enhances Encapsulation. I agree with that what I'm saying is that because the interrupt process at low level is not aware of a C++ instance …

i'm curious. are classes suitable for I/O drivers with unique interrupts associated with each I/O port (e.g. tty)? of course an OOD doesn't need to use a class

it depends how you define the association but at low level, an interruption is really just saving basic processor context and jumping to a known location, execute the code over there, restore the context and go back to business as usual. So at microprocessor level, there is no application context w…

[image] J-M-L: They could have chosen to have an extra parameter to attachInterrupt() with a void * pointer that could be cast to the context you want upon execution and state that ISR functions would take such a parameter. The ESP32/8266 core provides all three options: void callback funct…

yes, they all call internally __attachInterruptFunctionalArg()

i don't expect an ISR nor associated callback to have an argument. each ISR is unique to a specific interrupt. the same ISR could be used for multiple interrupts but then needs to check which interrupt is currently active. it seem that a class is not well suited to provide an ISR without an ad…

[image] gcjr: here's a listing of /dev using cygwin on my Windows laptop Out of curiosity: For what reason do you post that listing?

[image] gfvalvo: For what ever reason the signature is wrong. Not just the signature, f is the wrong type entirely: it is a closure that stores a copy of the this pointer, it cannot be converted to a function pointer. [image] gfvalvo: The cleanest way I've seen is when there's an overloa…

Interrupt in class, ESP32

Projects Programming

Danois90 October 10, 2022, 5:14pm 43

Out of curiosity: For what reason do you post that listing?

Correct way to implement interrupts inside a class (Pi Pico W)

Topic		Replies	Views
Class member function as callback for interrupt Programming	24	797	May 18, 2025
attachInterrupt Pin Inside of Class Programming	4	161	September 17, 2025
Question about attaching interrupt within class Programming	11	3876	July 3, 2019
Using an Interrupt from a method inside a class Programming	20	14763	May 29, 2020
Can you have ISR's in a structure? Programming	15	2352	May 28, 2022

Interrupt in class, ESP32

Related topics