Using LiquidCrystal.h within a library.

Projects Programming
2

Your .h file looks OK to me. You need to make at least two changes to your .cpp file:

  1. Change:
LCDvario::LCDvario(uint8_t rs,uint8_t enable,uint8_t d0,uint8_t d1,uint8_t d2,uint8_t d3)

to:

LCDvario::LCDvario(uint8_t rs,uint8_t enable,uint8_t d0,uint8_t d1,uint8_t d2,uint8_t d3) : _lcd(rs,enable,d0,d1,d2,d3)

That's how you initialize a member variable of a type that doesn't have a default constructor.

  1. Change:
void LCDvario::begin(uint8_t cols, uint8_t rows, uint8_t charsize = LCD_5x8DOTS)

to:

void LCDvario::begin(uint8_t cols, uint8_t rows, uint8_t charsize)

Default parameter values are declared only in the prototype, not in a separate implementation.

It's not essential, but in the .h file I would replace:

extern "C" {
  #include <string.h>
}

#include <stdlib.h>                        // needed for 'free'

by:

#include <cstring>
#include <cstdlib>                        // needed for 'free'

Finally, I strongly advise against calling 'free' or doing any other sort of dynamic memory allocation & freeing in embedded software, other than (if needed) allocations during the startup phase that are never freed. See Escher Technologies Articles on Formal Verification> for why.