As the title suggests: How can I create a custom function/method in Arduino C++ using PlatformIO?
Typically (in the Arduino IDE) I would simply write void myFunction() { \*some code*\ }
outside of the void loop() and void setup() methods and then call it by using myFunction().
However, doing this will result in an error: 'myFunction' was not declared in this scope.
How can I solve this and create/use custom methods in Arduino C++?
Other than the Arduino IDE, PlatformIO uses proper C++. Therefore, a function must be declared or defined before it is used the first time. First time refers to processing the C++ file top to bottom.
Either move the function before setup() and/or loop().
Add a forward declaration, e.g.:
void myFunction(); // forward declartion (no code, just ending with a semi-colon)
void setup {
...
}
void loop {
...
myFunction(); // use of myFunction()
...
}
// definition/implementation of myFunction()
void myFunction() {
...
myFunctions' code
...
}