Duda, define variable with smart compilation

Projects Programming
21

There is no way to define something in the sketch and expect it influenced the library

22

ah - it won't work then.

the compiler is compiling things separately. read about compilation units

there is a not so clean way to do it which basically means injecting the library code inside your .ino.

Everything from your "library" needs to be in just one file, with a .hpp suffix

for example your .ino is

#define VAR_V00 true
#define VAR_X00 true
#define VAR_X01 true

#include <secondary.hpp>

void setup() {
  Serial.begin(115200);
  printAllVariables();
}

void loop() {}

and in your library folder, you have a subfolder called secondary and inside that folder you have the .hpp file

secondary.hpp

#ifndef _SECONDARY_H_
#define _SECONDARY_H_

void printAllVariables();

#if VAR_V00
int    VAR_V00A = 0        ;//device 0: Minute day
bool   VAR_V01A = 0        ;//device 0: Status led
#endif

#if VAR_X00
int    VAR_X00A = 0        ;//device 1: Time mode
int    VAR_X00B = 0        ;//device 1: Time start
int    VAR_X00C = 0        ;//device 1: Time end
int    VAR_X00D = 0        ;//device 1: Time mode
int    VAR_X00E = 0        ;//device 1: Time start
int    VAR_X00F = 0        ;//device 1: Time end
#endif

#if VAR_X01
bool   VAR_X01A = 0        ;//device 2: RGB state
String VAR_X01B = "000000" ;//device 2: RGB color
#endif

void printAllVariables() {
  Serial.println("----------");

#if VAR_V00
  Serial.println(VAR_V00A);
#endif

#if VAR_X00
  Serial.println(VAR_X00A);
#endif

#if VAR_X01
  Serial.println(VAR_X01A);
#endif

  Serial.println("----------");
}

#endif
23

You can't use the #define's in the #include'd file if you put them AFTER the #include. Try:

#define VAR_V00
#define VAR_X00
#define VAR_X01

#include "ESP_VarDef.h"
24

I suppose you refer to the very first post

That won’t work for the library if there is a .cpp as it is compiled separately.

If everything is in the .h including the code (then it’s better named as .hpp) then indeed that works.

It’s not a great practice to have a dependency outside a library that won’t compile if you don’t include the three #define if you use true or false. the hpp should check if the keywords are defined and if not provide a default value. Alternatively just check with #ifdef and then don’t use true or false as it is ignore

25

Hello, after quite a few tests, I have more or less managed to get it working, thanks to @johnwasser