A callback is a function that is executed through a pointer where the function being pointed to contains application specific code. Callbacks are normally passed into a function and provides the ...

Tip #3 – Verify callback before use — Setting the initial value of the callback pointer to NULL or to a generic handler allows the interrupt to validate that an interrupt handler has been set. When ...

However, in C you have to define a function by name and pass a pointer — not a huge problem, but it can get messy if you have a lot of callback functions that you use only one time.