Initializing FastLED with non-constant pin values

Other Hardware LEDs and Multiplexing
1

Hi,
FastLED.addLeds() does not support variables as pin value.
I need to create a pre build firmware that let the user choose the digital pin to use at runtime.
I can workaround it using a switch but even if I use the FastLED.addLeds inside a switch case, it sucks up memory every time I create new case in the switch.
Is there a way to do it without wasting memory?
Thanks

2

Will this work to convert a variable into a constant?

void loop() {
  int i = 5;
  addLeds(i);
  end();
}

void addLeds(const int X) {
  FastLED.addLeds(X);
  // X++;
}

X++ says: "Error: increment of read-only parameter 'X'", so I guess it really is a constant. Can't test it, I don't have this FastLED library.

3

Erik_Baas:
Will this work to convert a variable into a constant?

void loop() {

int i = 5;
 addLeds(i);
 end();
}

void addLeds(const int X) {
 FastLED.addLeds(X);
 // X++;
}




`X++` says: "Error: increment of read-only parameter 'X'", so I guess it really *is* a constant. Can't test it, I don't have this FastLED library.

Erik_Baas:
Will this work to convert a variable into a constant?

void loop() {

int i = 5;
 addLeds(i);
 end();
}

void addLeds(const int X) {
 FastLED.addLeds(X);
 // X++;
}




`X++` says: "Error: increment of read-only parameter 'X'", so I guess it really *is* a constant. Can't test it, I don't have this FastLED library.

but this does not solve the problem.
I need to call
FastLED.addLeds(X);
only once in the code because addLeds is a template and it consumes memory every time I call it.

even this
if (pluto == true) {
FastLED.addLeds(X);
} else {
FastLED.addLeds(Y);
}

consumes memory because addLeds is "interpreted 2 times" at compile time.

4

Sorry, I thought your question was about "Initializing FastLED with non-constant pin values". Maybe I misread the topic title...