[C++] "Undefined Reference to " error

[Yomega96]

Hi to all,
I'm having a problem with pointers.
I'm trying to create a custom Touch Keyboard library, using MCUFRIEND_kbv TFT library.
When I try to pass the pointer of the TFT instance (found in main.cpp as tft variable) to the drawKeys function of the Keyboard library (call in loop() of main.cpp as kb.drawKeys(&tft)) i get an error

Code: [Select all] [Expand/Collapse]

1. .pio\build\esp32doit-devkit-v1\src\main.cpp.o:(.literal._Z4loopv+0x4): undefined reference to `Keyboard::drawKeys(MCUFRIEND_kbv*)'
2. .pio\build\esp32doit-devkit-v1\src\main.cpp.o: In function `loop()':
3. Filepath/src/main.cpp:140: undefined reference to `Keyboard::drawKeys(MCUFRIEND_kbv*)'

GeSHi © Codebox Plus Extension

"main.cpp" file

Code: [Select all] [Expand/Collapse]

1. //INCLUDES
2. #include <SPI.h>
3. #include "Adafruit_GFX.h"
4. #include <MCUFRIEND_kbv.h>
5. #include <Wire.h>
6. #include "Fonts/FreeSerif24pt7b.h"
7. #include <SD.h>
8. #include "Keyboard.h"
9.  
10. //TFT
11. MCUFRIEND_kbv tft;
12.  
13. //KeyBoard & Buttons configuration
14. #define XELEMENTS 13
15. #define YELEMENTS 3
16. #define BUTTONMARGINS 1
17. #define SIDEPADDING 6
18. int _width = round(tft.width()/XELEMENTS)-(2*BUTTONMARGINS);
19. int _height = _width;
20. Keyboard kb(_height, _width, YELEMENTS, XELEMENTS, BUTTONMARGINS, SIDEPADDING);
21.  
22. bool sd_init = false;
23. void setup()
24. {
25.     Serial.begin(250000);
26.     Serial.println(F("TFT LCD test"));
27.     pinMode(27, INPUT);
28.     pinMode(22, OUTPUT);
29.     Serial.print("TFT size is ");
30.     Serial.print(tft.width());
31.     Serial.print("x");
32.     Serial.println(tft.height());
33.     tft.reset();
34.     Serial.print("ID: ");
35.     Serial.println(tft.readID(), HEX);
36.     uint16_t identifier = 0x9486;
37.     tft.begin(identifier);
38.     tft.fillScreen(TFT_BLACK);
39.     tft.setRotation(3);
40.     if (SD.begin(5))
41.     {
42.         sd_init = true;
43.     }
44.     tft.fillRect(0, 0, 480, 320, TFT_BLACK);
45.    
46. }
47. void loop(void)
48. {
49.     while(1)
50.     {
51.         //tft.setFont(&FreeSerif24pt7b);
52.         tft.fillRect(0,50,480,100, TFT_BLACK);
53.         kb.drawKeys(&tft);
54.         delay(2000);
55.     }
56. }

GeSHi © Codebox Plus Extension

"Keyboard.h" file

Code: [Select all] [Expand/Collapse]

1. #ifndef _KEYBOARD_H
2. #define _KEYBOARD_H
3.  
4. #include "Adafruit_GFX.h"
5. #include <MCUFRIEND_kbv.h>
6.  
7. class Keyboard {
8.     private:
9.  
10.     public:
11.         Keyboard(short _h, short _w, short _yel, short _xel, short _bmargins, short _sidepad);
12.         void drawKeys(MCUFRIEND_kbv* _tft);
13. };
14. #endif

GeSHi © Codebox Plus Extension

"Keyboard.cpp" file

Code: [Select all] [Expand/Collapse]

1. #include "Keyboard.h"
2. #include "MCUFRIEND_kbv.h"
3. #include "Adafruit_GFX.h"
4.  
5. //Defines to configurate buttons
6. /*
7. #define XELEMENTS 13
8. #define YELEMENTS 3
9. #define BUTTONMARGINS 1
10. #define SIDEPADDING 6
11. */
12.  
13. short xEl = 0, yEl = 0, bMargins = 0, sidePadding = 0, width = 0, height = 0;
14. unsigned short bBorder = 0, bBackground = 0, bTextColor = 0;
15.  
16. const char Mobile_KB[3][13] PROGMEM = {
17. {0, 13, 10, 'Q', 'W', 'E', 'R', 'T', 'Y', 'U', 'I', 'O', 'P'},
18. {2, 11, 9, 'A', 'S', 'D', 'F', 'G', 'H', 'J', 'K', 'L'},
19. {2, 11, 7, 'Z', 'X', 'C', 'V', 'B', 'N', 'M'},
20. };
21.  
22. const char Mobile_NumKeys[3][13] PROGMEM = {
23. {0, 13, 10, '1', '2', '3', '4', '5', '6', '7', '8', '9', '0'},
24. {2, 11, 9, '-', '/', ':', ';', '(', ')', '&', '@', '"'},
25. {2, 11, 7, '.', ',', '?', '!', '\'', '`', '$'}
26. };
27.  
28. const char Mobile_SymKeys[3][13] PROGMEM = {
29. {0, 13, 10, '[', ']', '{', '}', '#', '%', '^', '*', '+', '='},
30. {2, 11, 9, '_', '\\', '|', '~', '<', '>', '$', '"', '&'}, //4
31. {2, 11, 7, '.', ',', '?', '!', '\'', '`', '@'}
32. };
33.  
34. Keyboard::Keyboard(short _h, short _w, short _yel, short _xel, short _bmargins, short _sidepad)
35. {
36.     height = _h;
37.     width = _w;
38.     yEl = _yel;
39.     xEl = _xel;
40.     bMargins = _bmargins;
41.     sidePadding = _sidepad;
42. }
43.  
44. void drawKeys(MCUFRIEND_kbv &_tft)
45. {
46.     int yoffset = height - (height * yEl);
47.     for (int i = 0; i < yEl; i++)
48.     {
49.         for (int x = 0; x < xEl; x++)
50.         {
51.             _tft.fillRoundRect(((width*x)+bMargins+sidePadding),(((height*i)+yoffset)+bMargins), width-(2*bMargins), height-(2*bMargins), 8, TFT_DARKCYAN);
52.             _tft.drawRoundRect(((width*x)+bMargins+sidePadding),(((height*i)+yoffset)+bMargins), width-(2*bMargins), height-(2*bMargins), 8, TFT_CYAN);
53.         }
54.     }
55. }
56.  
57.  

GeSHi © Codebox Plus Extension

I'm unable to compile, and unable to find the problem

Thanks to whoever explains me how to try to solve the problem
Kind regards

[chegewara]

Code: Select all

void drawKeys(MCUFRIEND_kbv &_tft) <----------------ERROR in this line
{
    int yoffset = height - (height * yEl);

[Yomega96]

Code: Select all

void drawKeys(MCUFRIEND_kbv &_tft) <----------------ERROR in this line
{
    int yoffset = height - (height * yEl);

I've solved!

Code: Select all

void Keyboard::drawKeys(MCUFRIEND_kbv* _tft)

What a noob,
Declaration with type* var , definition with type &var

Thanks for the help
Yomega96