M. Mahdi K. Kanan
Published © GPL3+

How to Drive Nokia Tiny LCDs

Here's a simple circuit and code which is compatible with PCF8833 driver for old Nokia tiny LCDs such as 1208, 1600, 2126, 2310, 6100, 6125, N71.

IntermediateFull instructions provided1 hour1,043

Things used in this project

Hardware components

Microchip ATMega 8A
×1

Story

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Schematics

uploads2ftmp2f68de8428-9e50-4b8c-9cf8-0a383ba66fa82fsch_rvW0Mkthsv.jpg

Code

Code:

C/C++
/*******************************************************
This program was created by the
CodeWizardAVR V3.12 Advanced

Chip type               : ATmega8A
AVR Core Clock frequency: 8.000000 MHz (Internal)
*******************************************************/

#include <mega8.h>

register unsigned char		ucI,rucJ,rucK,i,j;

void vCMD();
void vData();
void vSend();
void vClk();
void vDelay();

// 1mS Timer 0 overflow interrupt service routine
interrupt [TIM0_OVF] void timer0_ovf_isr(void)
{
    rucJ++;
    TCNT0 = 125;//about 1mS
    TIFR = 0x01;
}

void main(void)
{
  //Microcontroller init
  PORTB = 0x0A;
  DDRB = 0x3F;
    
	OSCCAL = 0x99;
	  
  //Low level external interrupts - sleep enable
  MCUCR = 0x8A;

	//Timer 0
  TCNT0 = 0;
  TCCR0 = 0x03;
  TIFR = 0x01;
  TIMSK = 0x01;

	#asm("sei");

  //PORTB.PORTB0		//RST#
  //PORTB.PORTB1		//CS#
  //PORTB.PORTB2		//SI
  //PORTB.PORTB3		//SCK

  PORTB.PORTB0 = 0;		//RST#
  rucK = 250;
  //1 second delay
	vDelay();
	vDelay();
	vDelay();
	vDelay();
	
  PORTB.PORTB4 = 1; //Status LED 1 On
	vDelay();

  //LCD Reset
  rucK = 1;
  PORTB.PORTB0 = 1;		//RST#
	vDelay();
  PORTB.PORTB0 = 0;		//RST#
	vDelay();
  PORTB.PORTB0 = 1;		//RST#

  //LCD Init
  ucI = 0x11;
  vCMD();

  ucI = 0x20;
  vCMD();

  ucI = 0x3A;
  vCMD();
  ucI = 0x05;
  vData();

  ucI = 0x36;
  vCMD();
  ucI = 0xC8;
  vData();

  ucI = 0x25;
  vCMD();
  ucI = 0x30;
  vData();

  ucI = 0x29;
  vCMD();

  PORTB.PORTB5 = 1;
  rucK = 250;
  vDelay();

  //98*70
  ucI = 0x2A;
  vCMD();
  ucI = 0;
  vData();
  ucI = 97;
  vData();

  ucI = 0x2B;
  vCMD();
  ucI = 0;
  vData();
  ucI = 69;
  vData();

  //0xFFFF White
  //0x0000 Black

  while(1)
  {
    ucI = 0x2c; // Screen data command
    vCMD();
    
    //First line
    //Border white
  	for(j = 0; j < 98; j++)
    {
    	//1st byte: BBBBB GGG
      //2nd byte: GGG RRRRR
	    ucI = 0xFF;
	    vData();
	    ucI = 0xFF;
	    vData();
    }
    
    //Second line
    ucI = 0xFF;
    vData();
    ucI = 0xFF;
    vData();
    
    //Border Black
  	for(j = 0; j < 96; j++)
    {
    	//1st byte: BBBBB GGG
      //2nd byte: GGG RRRRR
	    ucI = 0x00;
	    vData();
	    ucI = 0x00;
	    vData();
    }
    
    ucI = 0xFF;
    vData();
    ucI = 0xFF;
    vData();
    
    //Blue screen
    for(i = 0; i < 66; i++)
    {
      //Border
	    ucI = 0xFF;
	    vData();
	    ucI = 0xFF;
	    vData();
	    ucI = 0x00;
	    vData();
	    ucI = 0x00;
	    vData();

    	for(j = 0; j < 94; j++)
      {
      	//1st byte: BBBBB GGG
        //2nd byte: GGG RRRRR
		    ucI = 0xF8;
		    vData();
		    ucI = 0x00;
		    vData();
      }
	    ucI = 0x00;
	    vData();
	    ucI = 0x00;
	    vData();
	    ucI = 0xFF;
	    vData();
	    ucI = 0xFF;
	    vData();
    }
    
    //Border
    ucI = 0xFF;
    vData();
    ucI = 0xFF;
    vData();
    
  	for(j = 0; j < 96; j++)
    {
    	//1st byte: BBBBB GGG
      //2nd byte: GGG RRRRR
	    ucI = 0x00;
	    vData();
	    ucI = 0x00;
	    vData();
    }
    ucI = 0xFF;
    vData();
    ucI = 0xFF;
    vData();
    
    //White border
  	for(j = 0; j < 98; j++)
    {
    	//1st byte: BBBBB GGG
      //2nd byte: GGG RRRRR
	    ucI = 0xFF;
	    vData();
	    ucI = 0xFF;
	    vData();
    }

    vDelay(); //250 mS Delay

    //Green screen
    ucI = 0x2c; // Screen data command
    vCMD();

    for(i = 0; i < 70; i++)
    {
    	for(j = 0; j < 98; j++)
      {
		    ucI = 0x07;
		    vData();
		    ucI = 0xE0;
		    vData();
      }
    }

    vDelay(); // 250mS Delay

    //Red Screen
    ucI = 0x2c; // Screen data command
    vCMD();

    for(i = 0; i < 70; i++)
    {
    	for(j = 0; j < 98; j++)
      {
		    ucI = 0x00;
		    vData();
		    ucI = 0x1F;
		    vData();
      }
    }

    vDelay(); //250mS
  };
}

void vCMD()
{
  PORTB.PORTB1 = 0;		//CS#

  #asm("NOP");
  #asm("NOP");
  #asm("NOP");
  #asm("NOP");

	PORTB.PORTB2 = 0;		//SI#

  #asm("NOP");
  #asm("NOP");
  #asm("NOP");
  #asm("NOP");
  
  vSend();
}

void vData()
{
  PORTB.PORTB1 = 0;		//CS#

  #asm("NOP");
  #asm("NOP");
  #asm("NOP");
  #asm("NOP");

	PORTB.PORTB2 = 1;		//SI#

  #asm("NOP");
  #asm("NOP");
  #asm("NOP");
  #asm("NOP");

  vSend();
}

void vSend()
{
  vClk();

  if(ucI & 0x80)
  	PORTB.PORTB2 = 1;		//SI#
  else
  	PORTB.PORTB2 = 0;		//SI#

  vClk();

  if(ucI & 0x40)
  	PORTB.PORTB2 = 1;		//SI#
  else
  	PORTB.PORTB2 = 0;		//SI#

  vClk();

  if(ucI & 0x20)
  	PORTB.PORTB2 = 1;		//SI#
  else
  	PORTB.PORTB2 = 0;		//SI#

  vClk();

  if(ucI & 0x10)
  	PORTB.PORTB2 = 1;		//SI#
  else
  	PORTB.PORTB2 = 0;		//SI#

  vClk();

  if(ucI & 0x08)
  	PORTB.PORTB2 = 1;		//SI#
  else
  	PORTB.PORTB2 = 0;		//SI#

  vClk();

  if(ucI & 0x04)
  	PORTB.PORTB2 = 1;		//SI#
  else
  	PORTB.PORTB2 = 0;		//SI#

  vClk();

  if(ucI & 0x02)
  	PORTB.PORTB2 = 1;		//SI#
  else
  	PORTB.PORTB2 = 0;		//SI#

  vClk();

  if(ucI & 0x01)
  	PORTB.PORTB2 = 1;		//SI#
  else
  	PORTB.PORTB2 = 0;		//SI#

  vClk();

  PORTB.PORTB1 = 1;		//CS#
}

void vClk()
{
  PORTB.PORTB3 = 0;		//SCK#
  
  #asm("NOP");
  #asm("NOP");
  #asm("NOP");
  #asm("NOP");
  PORTB.PORTB3 = 1;		//SCK#
  
  #asm("NOP");
  #asm("NOP");
  #asm("NOP");
  #asm("NOP");
}

void vDelay()
{
	rucJ = 0;
	
  while(rucJ < rucK) //100 mS delay
  {
  	#asm("sleep");
  };
}

Credits

M. Mahdi K. Kanan

M. Mahdi K. Kanan

30 projects • 14 followers
M. Mahdi K. Kanan is the manager of WiCardTech engineering group.

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