coroutine callback | Together C & C++ | Page 1

I am wondering if it's possible to update a callback function to use coroutines. I am using c++20 with MSVC 2019 amd64 16.10. I have a thirdparty C library that registers a callback and I'd like the callback function to get the value and free the caller's thread. I think a coroutine would help here but if a different strategy would be better then I'm all ears.

Code: https://godbolt.org/z/T365MaT8z
Expected: register a callback function and use co_await to wait for the callback to be triggered, get the value
Problem: trying to grasp coroutines and I'm not sure I'm returning the value from the promise_type

Compiler Explorer - C++ (arm64 msvc v19.29 VS16.10)

#pragma once

// C++ headers

class ThirdPartyLib
{
public:
static ThirdPartyLib &GetInstance() {
static ThirdPartyLib instance;
return instance;
};
void SetDoorClosedCB(void (cbFunc)(uint8_t oldVal, uint8_t newVal)) {
_doorClosedCB = cbFunc;
}

bool CloseSampleDoor() {
    _doorClosedCB(1, 0);

...

#coroutine callback