NHD-0220CW: cursor not visible with text

OS

• December 05, 2016 05:13

Hello.
It is my first OLED charakter display. I can turn on the cursor an move it to left and right. But when I send text, the cursor is not visible anymore. Is this correct?

Thanks.

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• 

  Saurabh_B

  • December 05, 2016 09:39

  The cursor should still be able to show up.
  Would you be able to tell me what settings you have for the Display On/Off register?

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• 

  OS

  • December 06, 2016 03:06

  Hello.
  In the init function it is " command(0x0C); //fund. com. set: display ON:0C".
  
  Later I send command(0x0E) for turning the cursor on. That works fine.
  Moving the Cursor with command(0x14) works also fine.
  When I call the function send_output(); the text is visible but the cursor disappeared.

  void send_output(void)
  {
    uint i=0;
    //command(0x01); //clear display
    command(0x02); //return home
    for(i=0;i<20;i++)
    {
      data(Line1[i]); //write Line1
    }
    command(0xC0); //line 2
    for(i=0;i<20;i++)
    {
      data(Line2[i]); //write Line2
    }
  }

  This is the hole init function:

  E_LOW; //RES_HIGH; //RES = 1; //reset HIGH – inactive
    wait(LCD_WAIT);//delayms(1); //delay
    command(0x2A); //fundamental command set: function set: RE ON
    command(0x71); //extended command set: function selection A
    data(0x00); // disable internal VDD regulator (2.8V I/O). data(0x5C) = enable regulator (5V I/O)
    command(0x28); //fundamental command set: function set:RE OFF
    command(0x08); //fund. com. set: display: display off, cursor off, blink off
    command(0x2A); //fundamental command set: function set: RE ON
    command(0x79); //extended com. set: OLED: "OLED command set" enabled (S.10)
    command(0xD5); //OLED command set: set display clock divide ratio/oscillator frequency
    command(0x70); //value: set display clock divide ratio/oscillator frequency
    command(0x78); //extended com. set: OLED: "OLED command set" disabled
    command(0x08); //(RE ON)fund.com. set: extended function set: 5-dot,no inverting of corsor,2-lines)
    command(0x06); //(RE ON)fund.com. set: COM SEG direction
    command(0x72); //ext. com.set: function selection B
    data(0x00);    //selectROM A, CGRAM
    command(0x2A); //fundamental command set: function set: RE ON
    command(0x79); //extended com. set: OLED: "OLED command set" enabled (S.10)
    command(0xDA); //OLED command set: set SEG pins hardware configuration
    command(0x10); //set SEG pins hardware configuration
    command(0xDC); //OLED command set: function selection C
    command(0x00); //function selection C: internal VSL + GPIO input disabled
    command(0x81); //OLED command set: set contrast control
    command(0xf0); //set contrast control: 0xf0
    command(0xD9); //OLED command set:set phase length
    command(0xF1); //set phase length: 0xf1
    command(0xDB); //OLED command set: set VCOMH deselect level
    command(0x40); //set VCOMH deselect level
    command(0x78); //extended com. set: OLED: "OLED command set" disabled
    command(0x28); //fundamental command set: function set:RE OFF
    command(0x06); //fundamental command set: cursor/blink moves right //BPIE
    command(0x01); //fund. com. set: clear display
    command(0x80); //fund. com. set: set DDRAM address to 0x00
    command(0x0C); //fund. com. set: display ON:0C
    wait(LCD_WAIT);//delayms(100); //delay

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• 

  OS

  • December 07, 2016 03:21

  Hello.
  One more notice: When I send command(0x01) to clear the display, the text is erased but the cursor is visible again (at first position).
  
  What am I doing wrong?

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  OS

  • December 07, 2016 03:41

  Hi again.
  I think my problem is done. It seams as if I had a wrong idea of how the cursor works.
  It is not possible to show a character and a cursor at one position at the same time, is this correct?
  
  Kind regards.

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  OS

  • December 07, 2016 05:08

  Ok, I found out a new thing: it is possible to show a character and a cursor at one position at the same time.  
  
  But one more question: Is it possible to deactivate the auto increment of the cursor? I want to move the cursor independet from the characters written.
  
  Thanks.

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• 

  Saurabh_B

  • December 07, 2016 08:04

  Hello,
  
  Good to see you've got it.
  Unfortunately it is not possible to disable the cursor moving either left or right after printing a character. You would need to manually set the address to the desired location and rewrite the character printed where you need it.
  
  This controller will allow you to increment or decrement the address counter after printing a character.

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