Nhờ các bác giúp đỡ chương trình này có gì sai không mà không chạy

[luanktd]

- Sử dụng PIC 16F887, kết nối với LCD theo chế độ 4 bít.
- D4====RB0
- D5====RB1
- D6====RB2
- D7====RB3
R/W nối đất
R/S=====RB4
E======RB5

/*
* File: newmainpicc.c
* Author: DINH LUAN
*
* Created on 01/09, 2013,
*/


#include "htc.h"
#define_XTAL_FREQ 8000000
__CONFIG(FOSC_HS & WDTE_OFF & PWRTE_ON & MCLRE_ON & CP_OFF & BOREN_OFF
& IESO_OFF & FCMEN_OFF & LVP_OFF & DEBUG_ON); //1st config. Word
__CONFIG(BOR4V_BOR21V); //2st config.

#define RS RB4
#define EN RB5
#define LCD_OUT PORTB
// delay function
void _delay_us (unsigned char us){
while(us--){
asm("nop");
asm("nop");
};
}

//================================================== ========================================
void _delay_ms(unsigned char ms){
unsigned char i, j;
while(ms--){
for (i = 0; i < 20; i++)
for (j = 0; j < 100; j++)
asm("nop");
};
}
// void LCD_STROBE
void LCD_STROBE()
{
EN=1;
;
EN=0;
}
void LCD_DATA(unsigned char c)
{ unsigned char temp;
RS=1;
_delay_us(50); // delay 50us
temp=c; // send 4 high bit
temp=temp>>4; //
LCD_OUT = temp|0x30; //
LCD_STROBE();
LCD_OUT=c|0x30; // send 4 low bit
LCD_STROBE();
}
void LCD_CMD(unsigned char c)
{
RS =0;
unsigned char temp;
_delay_us(50);
temp=c;
temp=temp>>4;
LCD_OUT = temp&0x0F;
LCD_STROBE();
LCD_OUT = temp&0x0F;
LCD_STROBE();
}
void clear(void) // Clear dislay
{
LCD_CMD(0x01);
_delay_ms(2);
}
void LCD_INIT()
{
TRISB =0;
EN=0;
RS=0;
_delay_ms(100);// delay 100ms waiting for operting LCD
LCD_CMD(0x28); // Function set (4 bit mode , 2 line, 5x7 Pixels)
LCD_CMD(0x0C); // Display on cursor off
LCD_CMD(0x06); // Set entry mode (auto increment of cursor)
}
void string(const char *q)
{
while(*q)
{
LCD_DATA(*q++);
}
}
void main()
{
LCD_INIT(); //
while(1)
{
LCD_CMD(0x80);
string("HELLO");
LCD_CMD(0xc0);
string("LCD BIT MODE ");
}
}