LCD

[V]

Hello, I’ve problem with LCD. I use at89c2051

 

#include <at89x51.h>
#include “lcd.h”
#define PRELOAD01 (65536 – (tWord)(OSC_FREQ / (OSC_PER_INST * 1020)))
#define PRELOAD01H (PRELOAD01 / 256)
#define PRELOAD01L (PRELOAD01 % 256)

#define LCD_RS         P1_5
#define LCD_EN         P1_4
#define LCD_DATA    P1

void delay_10ms(void)
{
TMOD &=0xF0;
TMOD |=0x01;

ET0=0;

TH0=0xDF;
TL0=0x73;

while(TF0==0);
TR0=0;
}

void delay_70ms(void)
{
TMOD &=0xF0;
TMOD |=0x01;

ET0=0;

TH0=0x1C;
TL0=0x23;

while(TF0==0);
TR0=0;
}

void delay_5ms(void)
{
TMOD &=0xF0;
TMOD |=0x01;

ET0=0;

TH0=0xEF;
TL0=0xBA;

while(TF0==0);
TR0=0;
}

void delay_100u(void)
{
TMOD &=0xF0;
TMOD |=0x01;

ET0=0;

TH0=0xFF;
TL0=0xAD;

while(TF0==0);
TR0=0;
}

void delay_70u(void)
{
TMOD &=0xF0;
TMOD |=0x01;

ET0=0;

TH0=0xFF;
TL0=0xC6;

while(TF0==0);
TR0=0;
}

void delay_10u(void)
{
TMOD &=0xF0;
TMOD |=0x01;

ET0=0;

TH0=0xFF;
TL0=0xF8;

while(TF0==0);
TR0=0;
}

void LCD_STROBE (void);

void lcd_write(unsigned char c)
{
delay_70u();
LCD_DATA = ( ( c >> 4 ) & 0x0F );
LCD_STROBE();
LCD_DATA = ( c & 0x0F );
LCD_STROBE();
}

/*
* Clear and home the LCD
*/

void lcd_clear(void)
{
LCD_RS = 0;
lcd_write(0x1);
delay_10u();
}

/* write a string of chars to the LCD */

void lcd_puts(const char * s)
{
LCD_RS = 1; // write characters
while(*s)
lcd_write(*s++);
}

/* write one character to the LCD */

void lcd_putch(char c)
{
LCD_RS = 1; // write characters
lcd_write( c );
}

/*
* Go to the specified position
*/

void lcd_goto(unsigned char pos)
{
LCD_RS = 0;
lcd_write(0x80+pos);
}

/* initialise the LCD – put into 4 bit mode */

void lcd_init()
{
char init_value;

init_value = 0x3;

LCD_RS = 0;
LCD_EN = 0;

delay_70ms(); // delay for 150ms
delay_70ms();
delay_10ms();
LCD_DATA = 0x3;
LCD_STROBE();

delay_5ms();

LCD_DATA = 0x3;
LCD_STROBE();
delay_100u();

LCD_DATA = 0x3;
LCD_STROBE();
delay_100u();

LCD_DATA = 0x2;
LCD_STROBE();
delay_100u();

LCD_DATA = 0x2;
LCD_STROBE();
LCD_DATA = 0x8;
LCD_STROBE();
delay_100u();

LCD_DATA = 0x0;
LCD_STROBE();
LCD_DATA = 0x8;
LCD_STROBE();
delay_100u();

LCD_DATA = 0x0;
LCD_STROBE();
LCD_DATA = 0x1;
LCD_STROBE();
delay_5ms();

LCD_DATA = 0x0;
LCD_STROBE();
LCD_DATA = 0x6;
LCD_STROBE();
delay_100u();

LCD_DATA = 0x0;
LCD_STROBE();
LCD_DATA = 0xC;
LCD_STROBE();
delay_100u();

LCD_RS = 1;
}

void LCD_STROBE(void)
{
LCD_EN = 1;
delay_10u();
LCD_EN= 0;
}

void main (void)
{

lcd_init();
lcd_goto(0);

lcd_puts(“T”);

}

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