U8glib and LCD --> very strange problem

Projects Programming
1

Hi to all.

Yesterday a college of mine want's to add some changes to the working code so i need to make some small ( non LCD ) changes. The code is installed on 6 devices and working without problems, for last 5 months.

So, i made some changes, burn the code to new arduino but the display isnt working.
I tested with some older codes and the situation is the same, LCD is powered ON but there's no text on it.

Nothing, i started the demo code and on my big surprise, hello world and other examples are working fine. Heee ?

I would understand that there is a SW problem but like i wrote, this code is running successfully on 6 other devices and am 100% sure i didnt change anything in the LCD part. To be sure i tested some old code and this one isnt working too.

I can share part of the code, if someone can take a look...
Suggestions ?

Arnix

2

Hi,
What version of the IDE are you using?
Have you tried an earlier version to compile and load?

Tom... :slight_smile:

3

Your best bet would be to share ALL of the code. Sometimes problems are in places where one least expects them.

4

I can share part of the code, if someone can take a look...

It would be better if you shared all of it or a small but complete program that demonstrates the problem.

Which Arduino board are you using ?

5

Am using :
-IDE 1.8.2 ( linux ubuntu )

  • mega 2560

I didnt try with older IDE versions but if the demo code is working then i guess this should not be a problem.

I remember that i played with gnd pin before, but like i wrote, demo is working so, this also could not be a problem. Am gonna try with older IDE versions in the meantime.5
EDITED : - the same problem on older 1.6.5 IDE

Code:

  • gonna try to share all of the code, but am not sure if this will be possible.

Arnix

6

This is stripped code but this is also the whole code that has anything to do with LCD.
I changed the vars and names to english so there my be some typo...

#include <U8glib.h>
//#include "U8glib.h"
#include <EEPROM.h>
#include <Keypad.h>

U8GLIB_ST7920_128X64 u8g(13, 11, 12, U8G_PIN_NONE);

void u8g_prepare(void) {
  u8g.setFont(u8g_font_6x10);
  u8g.setFontRefHeightExtendedText();
  u8g.setDefaultForegroundColor();
  u8g.setFontPosTop();
}

void greetingMsg(void) {
  //-------- SA FRAMEOM
  u8g.drawFrame(3, 3, 122, 38);

  u8g.setFont(u8g_font_6x12);
  u8g.drawStr(15, 13, "Insert coin");
  u8g.setFont(u8g_font_10x20);

  String str = String(rest) + " Eur";
  const char *srest = str.c_str();
  u8g.drawStr( 23, 28, srest  );
  u8g.setFont(u8g_font_6x12);

  str = "Inserted: " + String(allIN) + "eur";
  const char *ssetup = str.c_str();
  u8g.drawStr( 8, 38, ssetup);

  u8g.drawCircle(11, 52, 9);
  u8g.drawCircle(30, 52, 9);
  u8g.drawCircle(49, 52, 9);

  u8g.setFont(u8g_font_6x12);
  u8g.drawStr( 5, 56, "10");
  u8g.drawStr( 25, 56, "20");
  u8g.drawStr( 44, 56, "50");

  u8g.drawStr( 70, 50, Input);
}


void enought(void) {
  //--------  with FRAME
  u8g.drawFrame(3, 3, 122, 38);

  u8g.setFont(u8g_font_6x12);
  u8g.drawStr(15, 13, "Insert coins");
  u8g.setFont(u8g_font_10x20);

  u8g.drawStr( 4, 28, "Door open");
  u8g.setFont(u8g_font_6x12);

  String  str = "Inserted: " + String(allIN) + "eur";
  const char *ssetup = str.c_str();
  u8g.drawStr( 8, 38, ssetup);

  u8g.drawCircle(11, 52, 9);
  u8g.drawCircle(30, 52, 9);
  u8g.drawCircle(49, 52, 9);

  u8g.setFont(u8g_font_6x12);
  u8g.drawStr( 5, 56, "10");
  u8g.drawStr( 25, 56, "20");
  u8g.drawStr( 44, 56, "50");
  u8g.drawStr( 70, 50, Input);
}


// -------------------------------- SETUP ----------------------------------
void setup(void) {
  Serial.begin(9600);

  // assign default color value
  if ( u8g.getMode() == U8G_MODE_R3G3B2 )
    u8g.setColorIndex(255); // white
  else if ( u8g.getMode() == U8G_MODE_GRAY2BIT )
    u8g.setColorIndex(3); // max intensity
  else if ( u8g.getMode() == U8G_MODE_BW )
    u8g.setColorIndex(1); // pixel on

}
void loop(void) {
  u8g_prepare();

  // INSERTED
  if (String(rest) == "0.00" ) {
    rest = needed;
    alltogether = 0;
    u8g.firstPage();
    do {
      dovoljno();
    } while ( u8g.nextPage() );
    otvoriRelay();
  } else if (rest < 0) {
    allIN = allIN - needed;
    rest = needed - allIN;
    otvoriRelay();
  }
  else {
    u8g.firstPage();
    do {
      greetingMsg();
    } while ( u8g.nextPage() );
  }
}

void ispisKoda(char Input[Password_Lenght]) {
  //-------- with FRAME
  u8g.drawFrame(3, 3, 122, 38);

  u8g.setFont(u8g_font_6x12);
  u8g.drawStr(15, 13, "Inserted code");
  u8g.setFont(u8g_font_10x20);

  String str = String(rest) + " Eur";
  const char *srest = str.c_str();
  u8g.drawStr( 23, 28, srest  );
  u8g.setFont(u8g_font_6x12);

  str = "Inserted: " + String(allIN) + "eur";
  const char *ssetup = str.c_str();
  u8g.drawStr( 8, 38, ssetup);

  u8g.drawCircle(11, 52, 9);
  u8g.drawCircle(30, 52, 9);
  u8g.drawCircle(49, 52, 9);

  u8g.setFont(u8g_font_6x12);
  u8g.drawStr( 5, 56, "10");
  u8g.drawStr( 25, 56, "20");
  u8g.drawStr( 44, 56, "50");
  u8g.drawStr( 70, 50, Input);
}

}
void clearData() {
  while (data_count != 0) {
    Input[data_count--] = 0;
  }
  return;
}


String giveInput(int lenght) {
  bool setup = false;
  int count = 0;
  String input = "";
  clearData() ;
  u8g.firstPage();
  do {
    greetingMsg();
  } while ( u8g.nextPage() );
  while (!setup) {
    char key = keypad.getKey();
    if (key) {
      input += key;
      Input[count] = key;
      count++;
      u8g.firstPage();
      do {
        greetingMsg();
      } while ( u8g.nextPage() );

    }
    if (count == lenght - 1)
    {
      clearData() ;
       u8g.firstPage();
       do {
        greetingMsg();
      } while ( u8g.nextPage() );
      return input;
    }
  }
}