UTFT problem (solved now)

Projects Programming
1

Hello.

After upgrading to IDE 1.6.5 my program doesn't work anymore. Because i want to continue with IDE 1.6.5 i have some questions.

In this example i have a error message after the line:
myGLCD.setFont(Sinclair_M);

The error message is:
invalid conversion from 'const uint8_t* {aka const unsigned char*}' to 'uint8_t* {aka unsigned char*}' [-fpermissive]

Main program

#include "Sinclair_M.c"
#include <UTFT.h>

// Declare which fonts we will be using
extern uint8_t SmallFont[];
extern uint8_t BigFont[];

UTFT myGLCD(TFT01_50,38,39,40,41);

void setup()
{
  myGLCD.InitLCD();
  myGLCD.clrScr();
}

void loop()
{
  myGLCD.setColor(0, 255, 0);
  myGLCD.setBackColor(0, 0, 0);

  //myGLCD.setFont(Sinclair_M);
  myGLCD.setFont(Sinclair_M);


  
  myGLCD.print(" !\"#$%&'()*+,-./", CENTER, 0);
  myGLCD.print("0123456789:;<=>?", CENTER, 16);
  myGLCD.print("@ABCDEFGHIJKLMNO", CENTER, 32);
  myGLCD.print("PQRSTUVWXYZ[\\]^_", CENTER, 48);
  myGLCD.print("`abcdefghijklmno", CENTER, 64);
  myGLCD.print("pqrstuvwxyz{|}~ ", CENTER, 80);

  myGLCD.setFont(SmallFont);
  myGLCD.print(" !\"#$%&'()*+,-./0123456789:;<=>?", CENTER, 120);
  myGLCD.print("@ABCDEFGHIJKLMNOPQRSTUVWXYZ[\\]^_", CENTER, 132);
  myGLCD.print("`abcdefghijklmnopqrstuvwxyz{|}~ ", CENTER, 144);

  while(1) {};
}

Code for the inported font

// Sinclair_M.c
// Font type    : Full (95 characters)
// Font size    : 16x16 pixels
// Memory usage : 3044 bytes

#if defined(__AVR__)
	#include <avr/pgmspace.h>
	#define fontdatatype const uint8_t
#elif defined(__PIC32MX__)
	#define PROGMEM
	#define fontdatatype const unsigned char
#elif defined(__arm__)
	#define PROGMEM
	#define fontdatatype const unsigned char
#endif

fontdatatype Sinclair_M[3044] PROGMEM={
0x10,0x10,0x20,0x5F,

My question is: What do i wrong?

2

Usually you would use extern to bring in the font array.

extern uint8_t Sinclair_M[];

3

Thank you.

But const uint8_t is already declaired in the .C file. This file is original from Henning Karlsen, the maker of UTFT fonts. When i make the declaration external, it gives a conflicting declaration error. This is logical for me.

Maybe another help to solve this?

4

Where is your font file located?

5

My font file is located in the same map as the sketch.

6

See what happens if you put it into the UTFT folder instead.

7

invalid conversion from 'const uint8_t* {aka const unsigned char*}' to 'uint8_t* {aka unsigned char*}' [-fpermissive]

I am guessing when you declare variable as "const" you need to define it / use it as "const" too.
The message implies that you are no longer treating the variable as "const".

It is not the purpose of "const" anyway ?

8

invalid conversion from 'const uint8_t* {aka const unsigned char*}' to 'uint8_t* {aka unsigned char*}' [-fpermissive]

I am guessing when you declare variable as "const" you need to define it / use it as "const" too.
The message implies that you are no longer treating the variable as "const".

It is not the purpose of "const" anyway ?

It has nothing to do with that. I get the exact same error when I try to bring in my font file the way the OP is trying to do.

#include "TRONFont.c"
#include <UTFT.h>

// Declare which fonts we will be using
extern uint8_t SmallFont[];
extern uint8_t BigFont[];

UTFT myGLCD(TFT01_50,38,39,40,41);

void setup()
{
  myGLCD.InitLCD();
  myGLCD.clrScr();
}

void loop()
{
  myGLCD.setColor(0, 255, 0);
  myGLCD.setBackColor(0, 0, 0);

  //myGLCD.setFont(Sinclair_M);
  myGLCD.setFont(TRONFont);


  
  myGLCD.print(" !\"#$%&'()*+,-./", CENTER, 0);
  myGLCD.print("0123456789:;<=>?", CENTER, 16);
  myGLCD.print("@ABCDEFGHIJKLMNO", CENTER, 32);
  myGLCD.print("PQRSTUVWXYZ[\\]^_", CENTER, 48);
  myGLCD.print("`abcdefghijklmno", CENTER, 64);
  myGLCD.print("pqrstuvwxyz{|}~ ", CENTER, 80);

  myGLCD.setFont(SmallFont);
  myGLCD.print(" !\"#$%&'()*+,-./0123456789:;<=>?", CENTER, 120);
  myGLCD.print("@ABCDEFGHIJKLMNOPQRSTUVWXYZ[\\]^_", CENTER, 132);
  myGLCD.print("`abcdefghijklmnopqrstuvwxyz{|}~ ", CENTER, 144);

  while(1) {};
}

Result:

sketch_sep22a.ino: In function 'void loop()':
sketch_sep22a.ino:24:26: error: invalid conversion from 'const unsigned char*' to 'uint8_t* {aka unsigned char*}' [-fpermissive]
In file included from sketch_sep22a.ino:3:0:
C:\Users\Andrew\Documents\Arduino\libraries\UTFT/UTFT.h:219:8: error: initializing argument 1 of 'void UTFT::setFont(uint8_t*)' [-fpermissive]
void setFont(uint8_t* font);
^
Error compiling.

Now it if I call the font file with extern it works.

#include <UTFT.h>

// Declare which fonts we will be using
extern uint8_t SmallFont[];
extern uint8_t BigFont[];
extern uint8_t TRONFont[];

UTFT myGLCD(TFT01_50,38,39,40,41);

void setup()
{
  myGLCD.InitLCD();
  myGLCD.clrScr();
}

void loop()
{
  myGLCD.setColor(0, 255, 0);
  myGLCD.setBackColor(0, 0, 0);

  //myGLCD.setFont(Sinclair_M);
  myGLCD.setFont(TRONFont);


  
  myGLCD.print(" !\"#$%&'()*+,-./", CENTER, 0);
  myGLCD.print("0123456789:;<=>?", CENTER, 16);
  myGLCD.print("@ABCDEFGHIJKLMNO", CENTER, 32);
  myGLCD.print("PQRSTUVWXYZ[\\]^_", CENTER, 48);
  myGLCD.print("`abcdefghijklmno", CENTER, 64);
  myGLCD.print("pqrstuvwxyz{|}~ ", CENTER, 80);

  myGLCD.setFont(SmallFont);
  myGLCD.print(" !\"#$%&'()*+,-./0123456789:;<=>?", CENTER, 120);
  myGLCD.print("@ABCDEFGHIJKLMNOPQRSTUVWXYZ[\\]^_", CENTER, 132);
  myGLCD.print("`abcdefghijklmnopqrstuvwxyz{|}~ ", CENTER, 144);

  while(1) {};
}

Result:

Sketch uses 27,976 bytes (5%) of program storage space. Maximum is 524,288 bytes.

I also put my font file in the UTFT folder so now it has the DefaultFonts file and my TRONFont file

9

PROBLEM SOLVED!

Many thanks to everybody. And special thanks to HazardsMind. Your example was great!

What did i do now?
As showed in the example, this line: #include "Sinclair_M.c" have been deleted.
Original in IDE 1.0.6 I did make the declaration: extern uint8_t Sinclair_M[]; And i still have to do this.

The Sinclair_M.c file is still in the same directory as the scetch. But putting this file in the UTFT directory also works.

So, now i can continue my program! :slight_smile:

10

After much research (and this post!) I figured it out. extern must be used not #include and I had to put my font.c file into the UTFT library folder that has the DefaultFonts.c file in it.