problem when i interface the lcd with LPC2148

Did you read the instructions about how to post source code?

And why complain about lack of answers 38 minutes after the first post. Have you paid someone for premium support or why do you think volumteers have to jump whenever someone has a question?

Did you read the instructions about how to post source code?

And why complain about lack of answers 38 minutes after the first post. Have you paid someone for premium support or why do you think volumteers have to jump whenever someone has a question?

hi Per Westermark i am not understand ur reply

When you make your next post, please read the comments written just above the box where you write your text.

See the note about source there?

This is way easier to read:

#include <stdio.h>

int main(void) {
    printf("Hello World!\n");
    return 0;
}

instead of:
#include <stdio.h>

int main(void) {

printf("Hello World!\n");

return 0;

}

sorry for my mistake
note my LCD data-line is P1.16 =D0 to P1.23   =D7 and control line is P0.11 =rs P0.12=rw and  P0.13=e
#include<LPC214x.h>
void init_PLL(void);
void init_GPIO(void);
void lcd_data(unsigned char);
void lcd_cmd(unsigned char);
void lcd_init(void);
unsigned int adjust_portbit(unsigned char);
void delay(unsigned int);
//unsigned int    E=0x00002000;
//unsigned int   RW=0x00001000;
//unsigned int    RS=0x00000800;
 #define E 0x00002000
#define RW 0x00001000
#define RS 0x00000800

int main(void)
{
//unsigned int temp;
//unsigned int i;
init_PLL();
init_GPIO();
lcd_init();
while(1)
{
lcd_data('A');
lcd_data('B');
lcd_data('c');
lcd_data('d');
 delay(0xffffff);
  }
}
void init_PLL(void)
{
 PLL0CFG=0x00000024; // TO GENERATE 60 MHZ CCLK
 PLL0CON=0x00000001;
 PLL0FEED=0x000000AA;//UPDATE THE PLL REGISTER
 PLL0FEED=0x00000055;
 while(!(PLL0STAT & 0x00000400)); // CHECK WHETHRT THE CCLK IS GENERATED EXAXT VALUE
 PLL0CON=0x00000003;  //  CONNECT PLL
 PLL0FEED=0x000000AA; //UPDATE THE PLL REGISTER
 PLL0FEED=0x00000055;
 VPBDIV=0x00000002;      //PCLK=1/2*CCLK
}
void init_GPIO( void)
{
//PINSEL0=0x00000000;
//PINSEL1=0x00000000;
IODIR0=0x0000FF00;
IODIR1=0x00FF0000;
}
void lcd_init(void)
{
  lcd_cmd(0x30);
delay(0xffff);
  lcd_cmd(0x30);
delay(0xffff);
  lcd_cmd(0x30);
delay(0xffff);
lcd_cmd(0x38);
delay(0xffffff);
lcd_cmd(0x0e);
delay(0xffff);
lcd_cmd(0x01);
delay(0xffffff);
lcd_cmd(0x06);
delay(0xffffff);
}
unsigned int adjust_portbit(unsigned char c)
{
unsigned char j;
unsigned int result;
result=c;
for(j=0;j<16;j++)
{
result=result<<1;
}
return result;
}
void lcd_data(unsigned char ldata)
{
  unsigned int temp,z;
 temp=adjust_portbit(ldata);
    //init_GPIO();
   z=~temp;
   IOCLR1=z;
  IOSET1=temp;
  delay(0xffff);
  IOCLR0=RW;
 IOSET0=RS;
 IOSET0=E;
 delay(0xffffff);
 IOCLR0=E;
 }
  void lcd_cmd(unsigned char lcmd)
  {

    unsigned int temp,z;
 temp=adjust_portbit(lcmd);
    //init_GPIO();
        z=~temp;
   IOCLR1=z;
  IOSET1=temp;
  delay(0xffff);
  IOCLR0=RW;
 IOCLR0=RS;
 IOSET0=E;
 delay(0xffffff);
 IOCLR0=E;

  }
  void delay(unsigned int value)
  {
  unsigned int i;
  for(i=0;i<value;i++);
  {
 // for(j=0;j<0xffff;j++);
  }
  }

1) Did you copy the source code directly from the text editor?

2) Are you _really_ indenting your code like that?

please man if you want help please help im beginer to arm and student

And as a student, it does help to early learn to indent the code. It will save you many, many, many hours looking for strange errors in the code.

Another thing: Have you verified that your delay actually makes a reasonable delay? Remember that a for loop that does not produce any side effect may be thrown away.

Instead of looping n turns, configure a timer and busy-loop looking at the timer counting. Then you will know exactly how many us or ms your delay will take.

unsigned int adjust_portbit(unsigned char c) {
    unsigned char j;
    unsigned int result;
    result=c;
    for (j=0; j<16; j++) {
        result=result<<1;
    }
    return result;
}

Why not just:

return ((unsigned)c) << 16;

Have you designed your own hardware, or what board are you using?

thanks yes my own board

And how have you verified the hardware?

Yes

With such answers: Are you really expecting more help?

"Sanju naik K": Yes.

:-)

can i use slow GPIO in LCD interface

You can use either. It really doesn't matter, since the display does not have any requirement that you must be very fast when accessing it.

how to calculate 1 ms delay using arm lpc2148 mcu

Hello, I'm ok with you being busy and all but i need answer urgent
Thanks.