3595i LCD – First Signs of Life

Even a small success is a success. I have for the first time seen a reaction from the LCD screen I pulled out of my nokia 3595i. Although I had some code on hand from other Internet sources I couldn’t get any response from the screen. Please forgive this photo, I don’t have a suitable back light set up for this display so you see an LED filtered by a piece of paper behind the display.

I made progress because I was able to get a hold of the datasheet for controller this screen uses. It was linked to at one of my favorite tech blogs, Embedded Projects From Around the Web. Their post was a review of a project that connected LCD screen from a Nokia 3510i to a pic16f84. The code there is in assembly and I’m not able to make much sense out of that language.

I will continue to develop a library for interfacing an ATtiny2313 with this display. Look for more as I make progress. To wet your appetite, here’s the source code that provides the output you see in the picture above:

#define F_CPU 1000000UL

#include <avr/io.h>
#include <util/delay.h>

#define LCD_PORT PORTB
#define LCD_DDR  DDRB
#define LCD_CLK (1<<PB0)
#define LCD_SIO (1<<PB1)
#define LCD_CS  (1<<PB2)

#define csh LCD_PORT |= LCD_CS

//LCD_Out function comes from source code found here:
//http://hobbyelektronik.org/Elo/AVR/3510i/index.htm
//Unfortunately this is the only way I know to attribute
//this code to the writer.
void LCD_Out(unsigned char Data, unsigned char isCmd) {
	if(isCmd) LCD_PORT |= LCD_CS;
	LCD_PORT &= ~(LCD_CLK|LCD_CS);  //Clock and CS low

	LCD_PORT |= LCD_SIO;		//SData High
	if(isCmd) LCD_PORT &= ~LCD_SIO; //If it is a command, SData Low

	LCD_PORT |= LCD_CLK;		//Clock High

	for(char x=0; x<8; x++)	{
		LCD_PORT &= ~(LCD_SIO|LCD_CLK);		//Clock and SData low
		if(Data & 128) LCD_PORT |= LCD_SIO;  	// Mask MSB - SData high if it is a 1
		LCD_PORT |= LCD_CLK;			//Clock High
		Data=Data<<1;				//Shift bits 1 left (new MSB to be read)
	}
}

void LCD_init(void)
{
  LCD_DDR |= (LCD_CLK | LCD_SIO | LCD_CS);
  LCD_PORT |= (LCD_CLK | LCD_SIO | LCD_CS);

  //Software Reset
  LCD_Out(0x01, 1);
  _delay_ms(10);
  csh;

  //Booster Voltage On
  LCD_Out(0x03, 1);
  _delay_ms(50);
  csh;

/*
  //Test Mode
  LCD_Out(0x04, 1);
  csh;
*/

  //Sleep Out
  LCD_Out(0x11, 1);
  csh;

  //Display mode Normal
  LCD_Out(0x13, 1);
  csh;

  //Display On
  LCD_Out(0x29, 1);
  csh;
}

int main(void)
{
  LCD_init();

  while(1)
  {

  }
}