LCD với CCS :(

[nhnp0708]

em dùng LCD 2x16, mô phỏng bằng proteus hiển thị rất đúng, nhưng khi ráp vào mạch thực tế thì .... nó chỉ hiện được đến cột 10, mạch để test là PIC2+ RED
cho em hỏi nguyên nhân tại sao quái thế ???

code lcd_lib_4bit.c

#include "d:\code ccs\drivers\stddef.h"

#define LCD_RS PIN_A3
#define LCD_RW PIN_A2
#define LCD_EN PIN_A1

#define LCD_D4 PIN_D0
#define LCD_D5 PIN_D1
#define LCD_D6 PIN_D2
#define LCD_D7 PIN_D3

// misc display defines-
#define Line_1 0x80
#define Line_2 0xC0
#define Clear_Scr 0x01

// prototype statements
#separate void LCD_Init ( void );// ham khoi tao LCD
#separate void LCD_SetPosition ( unsigned int cX );//Thiet lap vi tri con tro
#separate void LCD_PutChar ( unsigned int cX );// Ham viet1kitu/1chuoi len LCD
#separate void LCD_PutCmd ( unsigned int cX) ;// Ham gui lenh len LCD
#separate void LCD_PulseEnable ( void );// Xung kich hoat
#separate void LCD_SetData ( unsigned int cX );// Dat du lieu len chan Data

//khoi tao LCD**********************************************
#separate void LCD_Init ( void )
{
output_low(LCD_RW);
LCD_SetData ( 0x00 );
delay_ms(200); 
output_low ( LCD_RS );// che do gui lenh
LCD_SetData ( 0x03 ); 
LCD_PulseEnable();
LCD_SetData ( 0x02 ); 
LCD_PulseEnable(); 
LCD_PutCmd ( 0x2C ); 
LCD_PutCmd ( 0b00001100); 
LCD_PutCmd ( 0x06 ); 
LCD_PutCmd ( 0x01 ); 
}

#separate void LCD_SetPosition ( unsigned int cX )
{
/* this subroutine works specifically for 4-bit Port A */
LCD_SetData ( swap ( cX ) | 0x08 );
LCD_PulseEnable();
LCD_SetData ( swap ( cX ) );
LCD_PulseEnable();
}

#separate void LCD_PutChar ( unsigned int cX )
{
/* this subroutine works specifically for 4-bit Port A */
output_high ( LCD_RS );
LCD_PutCmd( cX );
output_low ( LCD_RS );
//delay_ms(0);
}

#separate void LCD_PutCmd ( unsigned int cX )
{
/* this subroutine works specifically for 4-bit Port A */
LCD_SetData ( swap ( cX ) ); /* send high nibble */
LCD_PulseEnable();
LCD_SetData ( swap ( cX ) ); /* send low nibble */
LCD_PulseEnable();
}
#separate void LCD_PulseEnable ( void )
{
output_high ( LCD_EN );
delay_us ( 3 ); // was 10
output_low ( LCD_EN );
delay_ms ( 3 ); // was 5
}

#separate void LCD_SetData ( unsigned int cX )
{
output_bit ( LCD_D4, cX & 0x01 );
output_bit ( LCD_D5, cX & 0x02 );
output_bit ( LCD_D6, cX & 0x04 );
output_bit ( LCD_D7, cX & 0x08 );
}

code main

#include "d:\code ccs\devices\16F877A.h"
#include "d:\code ccs\define\def_16F877A.h"
#device *=16 ADC=10
#fuses HS,NOWDT,NOPROTECT,NOLVP
#use delay(clock=10000000)
#include "d:\code ccs\func\lcd_lib_4bit.c"

//Main
void main(void)
{
	set_tris_d(0x00);
	lcd_init();

		LCD_putcmd(Line_1);
		LCD_putchar("0123456789012345");
		LCD_putcmd(Line_2);
		LCD_putchar("0123456789012345");
}