Problem in LCD text animation

[pradeep]

hello sir….
Im displaying few text on LCD 16×2. I’m able to shift the display to right. But I want to sift it to left.

//below string is for shifting the display to right....

lcdcmd(0x1C);  //Shift the entire display to right

What is the command to shift the entire display to left?

Please help.

[AJISH ALFRED]

Hi Pradeep,

 

//LcdCommandWrite(0x18); // shift display and cursor to the left
//LcdCommandWrite(0x1c); // shift display and cursor to the right

 

Hope this helps you.

[pradeep]

 

Thanku sir.

 

I have used the following code from this site but making a little changes to it in order to get display on both rows of LCD & also shift them towards left.
But once the entire display is shifted to left, it doesnot re-displayes form the right (as in the case of original code to shift the display to right).
Text is displayed when the entire text is at its initial position & then it again starts moving left.

 

 

 

// Program to display dynamic text on LCD 

 

#include<reg51.h>

#define msec 50

sbit rs=P3^0;   //Register select (RS)

sbit rw=P3^1;   //Read write (RW) pin

sbit en=P3^6;   //Enable (EN) pin

unsigned char commands[]={0x38,0x0E,0x01,0x06,’’};  //Command to be sent to LCD

unsigned char command[]={0x38,0x0E,0xc0,’’};  //Command to be sent to LCD

char name[]={“COLLEGE”};    //String to be displayed on LCD

char nam[]={“NAME”};    //String to be displayed on LCD

void delay(unsigned int time)  //Time delay function

{

unsigned int i,j;

for(i=0;i<time;i++)

  for(j=0;j<1275;j++);

}

 

void lcdcmd(unsigned char value)  //Function for sending values to the command register of LCD

{

P2=value;

rs=0;

rw=0;

en=1;

delay(1);

en=0;

return;

}

 

void display(unsigned char value)  //Function for sending values to the data register of LCD

{

P2=value;

rs=1;

rw=0;

en=1;

delay(1);

en=0;

return;

}

 

void main()

{

int i,j;

for(i=0;commands!=’’;i++)  //Sending string to LCD

{

  lcdcmd(commands);

  delay(msec);

}

for(j=0;name[j]!=’’;j++)

{

  display(name[j]);

  delay(msec);

}

  for(i=0;command!=’’;i++)  //Sending string to LCD

{

  lcdcmd(command);

  delay(msec);

}

for(j=0;nam[j]!=’’;j++)

{

  display(nam[j]);

  delay(msec);

}

while(1)

{ 

  lcdcmd(0x18);  //Shift the entire display to left

  delay(75);

}

}
 

 

also Im using AT89c51 so I want to use port P0 insted of port P2 in the above code. How to do that plz help.

[Author]

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