LPC2148- lcd interface sample code

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lcd.c
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#include <LPC214X.H>
#include "lcd.h"

void lowDelay()
{
int i=0,j=0;
for(i=0;i<3000;i++)
for(j=0;j<1000;j++);
}
void lowDelay1()
{
int i=0,j=0;
for(i=0;i<3000;i++)
for(j=0;j<10;j++);
}

void delay(int count)
{
  int j=0,i=0;
  for(j=0;j<count;j++)
  {
    /* At 60Mhz, the below loop introduces
    delay of 1000 us */
    for(i=0;i<350;i++);
  }
}

void lowBeep()
{      
IO1CLR |= (1<<25);
lowDelay1();
IO1SET |= (1<<25);
lowDelay();
}

void wait()
{
IO1CLR |= LCD_RS;
IO1SET |= LCD_RW|LCD_EN;
delay(1000);
while(IO0PIN & (1<<13));
IO1CLR |= LCD_EN;
}

void lcdWriteCmd(unsigned char cmd)
{
unsigned int tmp;
unsigned char mask = 0xf;
IO1CLR |= LCD_RS|LCD_RW;


delay(100);
tmp = (cmd>>4) & 0x0000000f;
IO0CLR |= mask<<10;
IO0SET |= tmp<<10;
IO1SET |= LCD_EN;
delay(10);
IO1CLR |= LCD_EN;
// wait();

delay(100);
tmp = (cmd) & 0x0000000f;
IO0CLR |= mask<<10;
IO0SET |= tmp<<10;
IO1SET |= LCD_EN;
delay(10);
IO1CLR |= LCD_EN;
// wait(); //
}

void lcdWriteDat(unsigned char cmd)
{
unsigned int tmp;
unsigned char mask = 0xf;
IO1SET |= LCD_RS;
IO1CLR |= LCD_RW;


delay(100);
tmp = (cmd>>4) & 0x0000000f;
IO0CLR |= mask<<10;
IO0SET |= tmp<<10;
IO1SET |= LCD_EN;
delay(10);
IO1CLR |= LCD_EN;
// wait();

delay(100);
tmp = (cmd) & 0x0000000f;
IO0CLR |= mask<<10;
IO0SET |= tmp<<10;
IO1SET |= LCD_EN;
delay(10);
IO1CLR |= LCD_EN;
// wait(); //
}

void strOut(char * data)
{
while(*data)
{
lcdWriteDat(* data);
data++;
}
}

void initLcd()
{
IO1DIR |= LCD_EN|LCD_RW|LCD_RS ;
IO0DIR |= D7_LCD|D6_LCD|D5_LCD|D4_LCD;

delay(1000);
  lcdWriteCmd(0x28);     /*   4-bit interface, two line, 5X7 dots.        */
  lcdWriteCmd(0x01);     /*   LCD clear                                   */
  lcdWriteCmd(0x02);     /*   cursor home                                 */
  lcdWriteCmd(0x06);     /*   cursor move direction                       */
  lcdWriteCmd(0x0C);    /*   display on      */
//   lcdWriteCmd(0x0F);
}

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lcd.h

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#ifndef __LCD__H__

#define __LCD__H__

#define LCD_EN (1<<22)

#define LCD_RW (1<<23)

#define LCD_RS (1<<24)

#define D7_LCD (1<<13)

#define D6_LCD (1<<12)

#define D5_LCD (1<<11)

#define D4_LCD (1<<10)

void initLcd(void);

void lcdWriteCmd(unsigned char cmd);

void lcdWriteDat(unsigned char cmd);

void strOut(char *);

void lowDelay(void);

void lowDelay1(void);

void delay(int count);

void wait(void);

void lowBeep(void);

#endif

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main.c

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#include "lcd.h"

#include <LPC214X.H>

main()

{

  

initLcd();  

delay(1000*10);

   

IO1DIR |= (1<<25);

lowBeep();

lcdWriteCmd(0x01);

delay(1000*10);

strOut("Hello LCD...");

delay(1000*100);

  while(1)

{

// delay(1000*6);

// lcdWriteCmd(0x10);

// lcdWriteDat(0x2d);

//

// delay(1000*6);

// lcdWriteCmd(0x10);

// lcdWriteDat(0x7c);

//

// delay(1000*6);

// lcdWriteCmd(0x10);

// lcdWriteDat(0x2f);

 

}

}

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