[SOLVED] "was not declared in this scope" afther linkin the .h file

Projects Programming
1

Hi guys i m at the end of my sanity with this so i thought there might be someone able to help me.

This is main program made as easy as posible:

#include <LiquidCrystal.h>
#include <LiquidCrystal_I2C.h>

#include "mastermind.h"
#include "lcd_wrapper.h"

void setup() {
  // put your setup code here, to run once:
  lcd_init();
}

void loop() {
  // put your main code here, to run repeatedly:
  delay(1000);
  lcd_print_at(1,0,"pls just work");
  lcd_clear();
}

And here is the .h file that i made:

#include <Arduino.h>
#include <LiquidCrystal.h>
#include <LiquidCrystal_I2C.h>

#include "lcd_wrapper.h"


void lcd_init(){
  lcd.init();   // initialize the lcd 
  lcd.init();
  // Print a message to the LCD.
  lcd.backlight();
}

void lcd_clear(){
  lcd.clear();
}


void lcd_set_cursor(int y, int x){
  lcd.setCursor(x,y);
}


void lcd_print(char* text){
    Serial.println(text);
}


void lcd_print_at(int y, int x, char* text){
    lcd_set_cursor(y, x);
    lcd_print(text);
}

but i must be doing somerhing wrong bcs it is posting this error:

sketch\lcd_wrapper.cpp: In function 'void lcd_init()':

lcd_wrapper.cpp:9:3: error: 'lcd' was not declared in this scope

   lcd.init();   // initialize the lcd

   ^~~

sketch\lcd_wrapper.cpp: In function 'void lcd_clear()':

lcd_wrapper.cpp:16:3: error: 'lcd' was not declared in this scope

   lcd.clear();

   ^~~

sketch\lcd_wrapper.cpp: In function 'void lcd_set_cursor(int, int)':

lcd_wrapper.cpp:21:3: error: 'lcd' was not declared in this scope

   lcd.setCursor(x,y);

   ^~~

exit status 1
'lcd' was not declared in this scope

Ty for your help.

2

So where is "lcd" declared?

3

DO NOT put executable code (or variable definitions) in .h files (except for class function definitions and templates). Doing so will cause linker errors when the .h file is #included in multiple source files.

For proper use of .h, .cpp files, see: Reply #3 Here.

4

Yea u right i was declaring display in the ps6 and it didnt worked so i've deleted it but i have not realized that error was pointing me to lcd_wrapper.h. Ty for help it might seem trivial but i spent few hours with this so ty knownASWOL.

And gfvalvo i know but i must do it this way bcs this is the assignment and it is very specific.

5

ren741:
And gfvalvo i know but i must do it this way bcs this is the assignment and it is very specific.

If you post the exact wording of the assignment, maybe we can advise