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| /*Program for LCD interfacing to ARM Microcontroller */
/*Robota Corporation*/
/*************************************************************************************************/
//Port 1.16-1.23 should be connected do Data pins of LCD(1.16=LSB)
//Port 0.16 should be connected to Rs pin of LCD.
//Port 0.17 should be connected to En pin of LCD.
#include<lpc21xx.h>
#include "lcd.h"
/*---------- Initialization of LCD ----------*/
void lcdinit(void)
{
unsigned int j;
unsigned char commands[]={0x30,0x30,0x30,0x20,0x28,0x08,0x01,0x06,0x0c},i=0;
IODIR1=0x00ff0000; //data pins
IODIR0=0x00030000; //rs=p0.16,en=p0.17
IOCLR1=0x00ff0000;
while(i<9)
{
delay_lcd();
lcdsendcommand(commands[i]);
i++;
}
}
/*---------- Delay for LCD function ----------*/
void delay_lcd()
{
unsigned int i;
for(i=0;i<1000;i++);
}
/*---------- Sending Command to LCD -----------*/
void lcdsendcommand(unsigned int cm)
{
cm=cm&&0xF0; //High Nibble
cm=cm<<16;
IOCLR0|=0x00010000; //RS =0 for Command.
IOCLR1|=0x00ff0000;
IOSET1|=cm;
IOSET0|=0x00020000;
delay_lcd();
IOCLR0|=0x00020000;
delay_lcd();
// Low Nibble
cm=cm&0x0F;
cm=cm<<4;
cm=cm<<16;
//IOCLR0|=0x00010000; //RS =0 for Command.
IOCLR1|=0x00ff0000; // check1 here
IOSET1|=cm;
IOSET0|=0x00020000;
delay_lcd();
IOCLR0|=0x00020000;
delay_lcd();
}
/*---------- Sending character to LCD ----------*/
void lcdsendchar(unsigned int ch)
{
ch=ch&0xF0;
ch=ch<<16;
IOSET0|=0x00010000; //RS=1 for Data
IOCLR1|=0x00ff0000;
IOSET1|=ch;
IOSET0|=0x00020000;
delay_lcd();
IOCLR0|=0x00020000;
delay_lcd();
ch=ch&0x0F;
ch=ch<<4;
ch=ch<<16;
// IOSET0=0x00010000; //RS=1 for Data
IOCLR1|=0x00ff0000;
IOSET1|=ch;
IOSET0=0x00020000;
delay_lcd();
IOCLR0=0x00020000;
delay_lcd();
}
/*---------- Sending LCD String ----------*/
void lcdsendstring(unsigned char *name)
{
while(*name!='\0')
{
lcdsendchar(*name);
name++;
}
}
/*---------- Sending number to LCD ----------*/
extern void lcdsendnumber(unsigned int n)
{
//conversion of HEX to ASCII---simple//
unsigned char a,b,c,d;
d=n%10;
n=n/10;
c=n%10; //converting Hex in decimal
n=n/10;
b=n%10;
n=n/10;
a=n%10;
d+=0x30;
c+=0x30; //converting decimal in ASCII.
b+=0x30;
a+=0x30;
lcdsendchar(a);
delay_lcd();
lcdsendchar(b);
delay_lcd();
lcdsendchar(c);
delay_lcd();
lcdsendchar(d);
lcdsendchar(0x41);
}
/*---------- Setting position of LCD ----------*/
void lcdposition(unsigned char LINE,unsigned char pos)
{
if(LINE==1)
lcdsendcommand(0x80+pos);
else if(LINE==2)
lcdsendcommand(0xC0+pos);
}
/*---------- Clearing LCD Screen ----------*/
void lcdclear(void)
{
lcdsendcommand(0x01);
} |
I need to interface 16x2 lcd to ARM LPC2148 , PLEASE SEE THE ABOVE CODE FUNCTION
lcdinit(); where I am sending commands 0x30,0x30,0x30,0x20,0x28,0x08,0x01,0x06,0x0c
, also check delay_lcd() function,
my LCD showing garbage characters in 4 bit mode , I have done parsing of upper nibble in lcdsendcommand(); and lcdsendchar(); functions...
please suggest..