LCD shift right and shift left bugs.

Armia Wagdy · Nov 14, 2013

I have made a library for LCD, and from the datasheet I read that the code 0x18 will shift the entire display to the left, but when I made that, the display disappears.
I have also read that 0x1C shifts the entire display to the right but when I made it, the entire display shifts to left.

this is my "LCD.h"

Code:

/*
 * LCD.h
 *
 * Created: 11/14/2013 7:51:54 PM
 *  Author: A R M T
 */ 


#ifndef LCD_H_
#define LCD_H_
#define F_CPU 1000000UL
#define __DELAY_BACKWARD_COMPATIBLE__
#include <util/delay.h>
#define LCD_DPRT PORTA                   //LCD DATA PORT
#define LCD_DDDR DDRA                    //LCD DATA DDR
#define LCD_DPIN PINA                    //LCD DATA PIN
#define LCD_CPRT PORTB                   //LCD COMMANDS PORT
#define LCD_CDDR DDRB                    //LCD COMMANDS DDR
#define LCD_CPIN PINB                    //LCD COMMANDS PIN
#define LCD_RS 0                         //LCD RS
#define LCD_RW 1                         //LCD RW
#define LCD_EN 2                         //LCD EN

void delay_us(unsigned int d);
void lcdCommand(unsigned char cmnd);
void lcdData(unsigned char data);
void lcd_init(void);
void lcd_gotoxy(unsigned char x, unsigned char y);
void lcd_print(char *str);

#endif /* LCD_H_ */

___________________________________________________________________________________________________________

"LCD.c"

Code:

/*
 * LCD.c
 *
 * Created: 11/14/2013 7:49:36 PM
 *  Author: A R M T
 */ 

#include <avr/io.h>
#include "LCD.h"

//*************************************************************
void delay_us(unsigned int d)
{
	_delay_us(d);
}
//*************************************************************
void lcdCommand(unsigned char cmnd)
{
	LCD_DPRT = cmnd;                   //send cmnd to data port
	LCD_CPRT &= ~(1<<LCD_RS);          //RS = 0 for command
	LCD_CPRT &= ~(1<<LCD_RW);          //RW = 0 for write
	LCD_CPRT |= (1<<LCD_EN);           //EN = 1 for H-to-l pulse
	delay_us(1);                       //Wait to make enable wide
	LCD_CPRT &= ~(1<<LCD_EN);          //EN = 1 for H-to-l pulse
	delay_us(100);                     //Wait to make enable wide
}
//*************************************************************
void lcdData(unsigned char data)
{
	LCD_DPRT = data;                    //send data to data port
	LCD_CPRT |= (1<<LCD_RS);			//RS = 1 for data
	LCD_CPRT &= ~(1<<LCD_RW);			//RW = 0 for write
	LCD_CPRT |= (1<<LCD_EN);            //EN = 1 for H-to-L pulse
	delay_us(1);						//wait to make enable wide
	LCD_CPRT &= ~(1<<LCD_EN);           //EN = 0 for H-to-L pulse
	delay_us(100);						//wait to make enable wide
}
//*************************************************************
void lcd_init(void)
{
	LCD_DDDR = 0xFF;
	LCD_CDDR = 0xFF;
	
	LCD_CPRT &= ~(1<<LCD_EN);			//LCD_EN = 0
	delay_us(15000);                    //wait for init
	lcdCommand(0x38);                   //init. LCD 2 line, 5 * 7 matrix
	lcdCommand(0x0E);					//display on, cursor on
	lcdCommand(0x01);					//clear LCD
	delay_us(2000);						//wait
	lcdCommand(0x06);					//shift cursor right
}
//*************************************************************
void lcd_gotoxy(unsigned char x, unsigned char y)
{
	unsigned char firstCharAdr[] = {0x80, 0xC0, 0x94, 0xD4};
	lcdCommand(firstCharAdr[y-1] + x - 1);
	delay_us(100);
}
//*************************************************************
void lcd_print(char *str)
{
	unsigned char i = 0;
	while (str[i] != 0)
	{
		lcdData(str[i]);
		i++;
	}
}
//*************************************************************

________________________________________________________________________

"App.c"

Code:

/*
 * main.c
 *
 * Created: 11/14/2013 7:54:02 PM
 *  Author: A R M T
 */ 
#include <avr/io.h>
#include "LCD.h"

int main(void)
{

	lcd_init();
	lcd_gotoxy(11,1);
	lcd_print("Armia");
	lcd_gotoxy(11,2);
	lcd_print("Wagdy");
	_delay_ms(1000 / 2);
	lcdCommand(0x18);     //shift the entire diplay to left
	while(1);
	return 0;
}

I meant that when I burned this code I excepected that aftr(1000 / 2) ms this output will shift to left

but what appear was:

Can any one help me in that problem please?!

mathespbe · Nov 15, 2013

Armia Wagdy said:

I have made a library for LCD, and from the datasheet I read that the code 0x18 will shift the entire display to the left, but when I made that, the display disappears.
I have also read that 0x1C shifts the entire display to the right but when I made it, the entire display shifts to left.

this is my "LCD.h"

Code:

/*
 * LCD.h
 *
 * Created: 11/14/2013 7:51:54 PM
 *  Author: A R M T
 */ 


#ifndef LCD_H_
#define LCD_H_
#define F_CPU 1000000UL
#define __DELAY_BACKWARD_COMPATIBLE__
#include <util/delay.h>
#define LCD_DPRT PORTA                   //LCD DATA PORT
#define LCD_DDDR DDRA                    //LCD DATA DDR
#define LCD_DPIN PINA                    //LCD DATA PIN
#define LCD_CPRT PORTB                   //LCD COMMANDS PORT
#define LCD_CDDR DDRB                    //LCD COMMANDS DDR
#define LCD_CPIN PINB                    //LCD COMMANDS PIN
#define LCD_RS 0                         //LCD RS
#define LCD_RW 1                         //LCD RW
#define LCD_EN 2                         //LCD EN

void delay_us(unsigned int d);
void lcdCommand(unsigned char cmnd);
void lcdData(unsigned char data);
void lcd_init(void);
void lcd_gotoxy(unsigned char x, unsigned char y);
void lcd_print(char *str);

#endif /* LCD_H_ */

___________________________________________________________________________________________________________

"LCD.c"

Code:

/*
 * LCD.c
 *
 * Created: 11/14/2013 7:49:36 PM
 *  Author: A R M T
 */ 

#include <avr/io.h>
#include "LCD.h"

//*************************************************************
void delay_us(unsigned int d)
{
	_delay_us(d);
}
//*************************************************************
void lcdCommand(unsigned char cmnd)
{
	LCD_DPRT = cmnd;                   //send cmnd to data port
	LCD_CPRT &= ~(1<<LCD_RS);          //RS = 0 for command
	LCD_CPRT &= ~(1<<LCD_RW);          //RW = 0 for write
	LCD_CPRT |= (1<<LCD_EN);           //EN = 1 for H-to-l pulse
	delay_us(1);                       //Wait to make enable wide
	LCD_CPRT &= ~(1<<LCD_EN);          //EN = 1 for H-to-l pulse
	delay_us(100);                     //Wait to make enable wide
}
//*************************************************************
void lcdData(unsigned char data)
{
	LCD_DPRT = data;                    //send data to data port
	LCD_CPRT |= (1<<LCD_RS);			//RS = 1 for data
	LCD_CPRT &= ~(1<<LCD_RW);			//RW = 0 for write
	LCD_CPRT |= (1<<LCD_EN);            //EN = 1 for H-to-L pulse
	delay_us(1);						//wait to make enable wide
	LCD_CPRT &= ~(1<<LCD_EN);           //EN = 0 for H-to-L pulse
	delay_us(100);						//wait to make enable wide
}
//*************************************************************
void lcd_init(void)
{
	LCD_DDDR = 0xFF;
	LCD_CDDR = 0xFF;
	
	LCD_CPRT &= ~(1<<LCD_EN);			//LCD_EN = 0
	delay_us(15000);                    //wait for init
	lcdCommand(0x38);                   //init. LCD 2 line, 5 * 7 matrix
	lcdCommand(0x0E);					//display on, cursor on
	lcdCommand(0x01);					//clear LCD
	delay_us(2000);						//wait
	lcdCommand(0x06);					//shift cursor right
}
//*************************************************************
void lcd_gotoxy(unsigned char x, unsigned char y)
{
	unsigned char firstCharAdr[] = {0x80, 0xC0, 0x94, 0xD4};
	lcdCommand(firstCharAdr[y-1] + x - 1);
	delay_us(100);
}
//*************************************************************
void lcd_print(char *str)
{
	unsigned char i = 0;
	while (str[i] != 0)
	{
		lcdData(str[i]);
		i++;
	}
}
//*************************************************************

________________________________________________________________________

"App.c"

Code:

/*
 * main.c
 *
 * Created: 11/14/2013 7:54:02 PM
 *  Author: A R M T
 */ 
#include <avr/io.h>
#include "LCD.h"

int main(void)
{

	lcd_init();
	lcd_gotoxy(11,1);
	lcd_print("Armia");
	lcd_gotoxy(11,2);
	lcd_print("Wagdy");
	_delay_ms(1000 / 2);
	lcdCommand(0x18);     //shift the entire diplay to left
	while(1);
	return 0;
}

I meant that when I burned this code I excepected that aftr(1000 / 2) ms this output will shift to left
View attachment 98523

but what appear was:
View attachment 98524
Can any one help me in that problem please?!

Put this command on the init section....

Code:

lcdCommand(0x18);

Armia Wagdy · Nov 15, 2013

Did you mean that the function init in LCD.c will be like that

Code:

"LCD.c"
[CODE]
/*
 * LCD.c
 *
 * Created: 11/14/2013 7:49:36 PM
 *  Author: A R M T
 */ 

#include <avr/io.h>
#include "LCD.h"
/******************************************************
void lcd_init(void)
{
	LCD_DDDR = 0xFF;
	LCD_CDDR = 0xFF;
	
	LCD_CPRT &= ~(1<<LCD_EN);			//LCD_EN = 0
	delay_us(15000);                    //wait for init
	lcdCommand(0x38);                   //init. LCD 2 line, 5 * 7 matrix
	lcdCommand(0x0E);					//display on, cursor on
	lcdCommand(0x01);					//clear LCD
	delay_us(2000);						//wait
	lcdCommand(0x06);					//shift cursor right
        delay_us(2000);
        lcdCommand(0x18);                                      
}

I have tried it and it doesn't work, nothing is appeared on the LCD

jayanth.devarayanadurga · Nov 15, 2013

Shift Left or Right commands shift all the lines of LCD. Zip and post your Atmel Studio Project files + Proteus file. What exactly you want?

0x1E and 0x18

http://www.geocities.com/dinceraydin/lcd/commands.htm

Armia Wagdy · Nov 15, 2013

I want to shift to right

and this is the code and proteus simulation

https://www.mediafire.com/?d66wd2zcdfmyp7a

jayanth.devarayanadurga · Nov 15, 2013

Try this. This is mikroC Code. Just change the delay function if needed.

Armia Wagdy · Nov 19, 2013

I want to shift the entire display just one position to left using 0x18

Welcome to EDAboard.com

LCD shift right and shift left bugs.

Armia Wagdy

Newbie level 4

mathespbe

Full Member level 3

Armia Wagdy

Newbie level 4

jayanth.devarayanadurga

Banned

Armia Wagdy

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jayanth.devarayanadurga

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Armia Wagdy

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