LCD

Development Boards MicroMod
1

Hay

I want interface 2x16 LCD with LPC2106 in 4 bit mode

I have tried the following code but I am not getting proper out put

Please Check the code.

#include"LPC210x.H"

#define RS_1 IOSET | 0x00000800 // RS=P0.11

#define RS_0 IOCLR | 0x00000800

#define EN_1 IOSET | 0x00000400 //EN=P0.10

#define EN_0 IOCLR | 0x00000400

// Data D4 D5 D6 D7 given to P0.16 P0.17 P0.18 P0.19

// R/W PIN IS CONNECTED TO GROUND

void delay()

{

unsigned int i;

for(i=0;i<=20000;i++);

}

void lcdcmd(unsigned char value) // LCD COMMAND

{

int data,copy;

data=value;

data=data<<16;

copy=data;

data=((data>>4)& 0x000F0000); //Strobe 4-Bit High Nibble to LCD

IOSET=IOSET | data;

IOCLR=IOCLR |~data;

IOCLR=RS_0; //COMMAND REGISTER

IOSET=EN_1;//LCD TO LATCH THE DATA

delay();

IOCLR=EN_0;

//lower nibble

data=copy;

data=(data & 0x000F0000); // Strobe 4-Bit Low -Nibble to LCD

IOSET=IOSET | data;

IOCLR=IOCLR |~data;

IOCLR=RS_0;//COMMAND REGISTER

IOSET=EN_1;//LCD TO LATCH THE DATA

delay();

IOCLR=EN_0;

}

void lcddata(unsigned char value) // LCD DATA

{

int data,copy;

data=value;

data=data<<16;

copy=data;

data=((data>>4) & 0x000F0000); //Strobe 4-Bit High Nibble to LCD

IOSET=IOSET | data;

IOCLR=IOCLR |~data;

IOSET=RS_1;//DATA REGISTER

IOSET=EN_1;//LCD TO LATCH THE DATA

delay();

IOCLR=EN_0;

////lower nibble/////////////////

data=copy;

data=(data & 0x000F0000); //Strobe 4-Bit Low Nibble to LCD

IOSET=IOSET | data;

IOCLR=IOCLR |~data;

IOSET=RS_1;//DATA REGISTER

IOSET=EN_1;;//LCD TO LATCH THE DATA

delay();

IOCLR=EN_0;

}

void main()

{

PINSEL0=0x00000000; //ALL PINS ARE GPIO

PINSEL1=0x00000000;

IODIR=0xFFFFFFFF; // ALL PINS ARE OUTPUT

delay();

lcdcmd(0x28); // 2X16 LCD IN 4 BIT MODE

lcdcmd(0x0E);

lcdcmd(0x01);

lcdcmd(0x06);

lcdcmd(0x80);

lcddata(‘T’);

lcddata(‘H’);

lcddata(‘A’);

lcddata(‘N’);

lcddata(‘K’);

lcddata(‘S’);

while(1);

}

Regards

chandu

2

Is your delay long enough?

You’ll find some LCD code in the LPC2000 group’s files section.

Leon

3

hay

Please help me any body regarding the 2x16 LCD in 4 bit mode data interfacing with LPC2106

I am straggling with the above code, I have executed above code. when ever I switched ON the system

Data is not displaying on the LCD, when ever I press reset button at that time data is displaying on the LCD

Please give me some solution

Regards

chandu

4

This could help. The initialization code is critical or the display does not switch in 4bits mode.

Source:

http://chibios.svn.sourceforge.net/view … iew=markup

Header file:

http://chibios.svn.sourceforge.net/view … iew=markup

I use this code for ad 2x16 display attached to an AVR micro in 4 bit mode, changing just the code for the I/O ports it should work for any micro, where you see chThdSleep() just insert a delay in milliseconds.

Note that the port is used in output mode only to make things easier, it works just fine.

regards,

Giovanni