Nhờ các bác Test cho coder hiển thị LCD này với

[phamhang]

tình hình là em muốn xuốt một chuỗi kí tự lên lcd theo chế độ 4 bit .trình dịch đã thành công nhưng khi nạp chương trình vào thì chẳng thấy có kí tự xuất lên cả .chỉ thấy có con led (em nối vào để xem chip có hoạt động không ?) thấy nó nháy theo yêu cầu. các bác test giúp em với.
thank trc các bác.

#include "p33FJ64MC802.h"
_FOSCSEL(FNOSC_FRC);
_FOSC(FCKSM_CSECMD&OSCIOFNC_OFF&POSCMD_NONE);
_FICD(ICS_PGD1&JTAGEN_OFF);
_FWDT(FWDTEN_OFF);

#define LCD_RS LATBbits.LATB13
#define LCD_RW LATBbits.LATB14
#define LCD_E LATBbits.LATB15

#define LCD_D4 LATBbits.LATB2
#define LCD_D5 LATBbits.LATB3
#define LCD_D6 LATBbits.LATB4
#define LCD_D7 LATBbits.LATB5

#define LED LATBbits.LATB12

// DINH NGHIA CAC CHE DO HOAT DONG CUA LCD

#define LCD_clear 0x01 //Xoa man hinh LCD
#define LCD_home 0x02 //Tro ve dau dong
#define LCD_normal 0x06 //Che do nhap du lieu binh thuong
#define LCD_normal_s 0x07 //Che do nhap du lieu binh thuong, dich man hinh
#define LCD_off 0x08 //Tat man hinh
#define LCD_on 0x0C //Bat man hinh
#define LCD_on_crsr 0x0E //Bat man hinh va con tro
#define LCD_on_blink 0x0F //Bat man hinh va con tro (nhap nhay)
#define LCD_4b2l 0x28 //Che do 2 dong, giao tiep 4 bit du lieu
#define LCD_homeL1 0x80 //Ve dau dong 1
#define LCD_homeL2 0xC0 //Ve dau dong 2
#define lcd_line_two 0x40

//---------------------------------------------------------------------------------------------------------
//Cac prototype cho cac chuong trinh con
void Init_OSOC(void);
void Init_PORTS(void);
void Delay_ms(unsigned long i_ms);
void Init_LCD(void);
void LCD_OK(void);
void LCD_CMD(unsigned char cmd);
void LCD_DATA (unsigned char dat);
void lcd_putstr(char *buffer);
void lcd_gotoxy(int x, int y);
void khoi_tao(void);

//--------CHUONG TRINH CHINH-------------------------------------------------------------------------------------------
int main (void)

{
Init_OSOC();
khoi_tao();
while(1) //Vong lap chinh
{
LED =1;
Delay_ms(1000);
LED=0;
Delay_ms(1000);

}

}

//--------Chuong trinh con khoi tao TRANG THAI BAN DAU----------------------------------------------------------
void khoi_tao(void)
{

Init_PORTS(); //Khoi tao cac cong I/O
Init_LCD(); //Khoi tao LCD

lcd_gotoxy(4,1);
lcd_putstr("HELLO");
lcd_gotoxy(1,2);
lcd_putstr("XIN CHAO");

}

//---------------------------------------------------------------------------------------------------------
void Init_OSOC(void)
{

//Config FCy=40MHz
PLLFBD=43; // M=45
CLKDIVbits.PLLPOST=0; // N2=2
CLKDIVbits.PLLPRE=0; // N1=2
OSCTUN=0;

// Disable Watch Dog Timer
RCONbits.SWDTEN=0; // N1=2
__builtin_write_OSCCONH(0x01);
__builtin_write_OSCCONL(0x01);

while(OSCCONbits.COSC != 0b001); // Wait for PLL to lock
while(OSCCONbits.LOCK!=1) {};
}

//------------------------------------------------------------------------------------------------------


void Init_PORTS(void)
{
ADPCFG = 0xffff; // all digital



// All port is digital pin.
PMD1=0xffff;
PMD2=0xffff;
PMD3=0xffff;


TRISBbits.TRISB2 = 0; //LCD_D4
TRISBbits.TRISB3 = 0; //LCD_D5
TRISBbits.TRISB4 = 0; //LCD_D6
TRISBbits.TRISB5 = 0; //LCD_D7
TRISBbits.TRISB13 = 0; //LCD_RS
TRISBbits.TRISB14 = 0; //LCD_RW
TRISBbits.TRISB15 = 0; //LCD_E
TRISBbits.TRISB12 = 0; // led
}


//------------------------------------------------------------------------------
void Delay_ms(unsigned long i_ms)
{
unsigned long i,j;
for(i=0;i<i_ms;i++)
{
for(j=0;j<1750;j++)
asm("clrwdt");
}
}

//---------------------------------------------------------------------------------------------------------
void Init_LCD(void)
{

LCD_CMD(0x02); //Dat che do giao tiep 4-bit, man hinh 2 dong
Delay_ms(1);
LCD_CMD(0x2C); //Tat man hinh
Delay_ms(1);
LCD_CMD(0x0C); //Che do nhap du lieu binh thuong
Delay_ms(1);
LCD_CMD(0x06 ); //Bat man hinh, hien con tro nhap nhay
Delay_ms(1);
LCD_CMD(0x01); //Xoa man hinh
Delay_ms(9);

}

//---------------------------------------------------------------------------------------------------------

void LCD_OK(void)
{
unsigned u;
LCD_E = 1; //Tao xung Enable
for (u = 0; u < 2; u++); //keo dai toi thieu 1 us
LCD_E = 0;
}

//---------chuong trinh xuat lenh che do 4 bit--------------------------------------------------------------------------------
void LCD_CMD(unsigned char cmd)
{
unsigned temp1;
LCD_RW = 0;
LCD_RS = 0; //Dat che do xuat lenh
temp1 = cmd >> 4; //Lay 4 bit cao
LCD_D4 = temp1 & 1; //Xuat 4 bit cao
LCD_D5 = (temp1 & 2) >>1;
LCD_D6 = (temp1 & 4) >>2;
LCD_D7 = (temp1 & 8) >>3;
LCD_OK();
temp1 = cmd & 0x0F; //Lay 4 bit thap
LCD_D4 = temp1 & 1; //Xuat 4 bit thap
LCD_D5 = (temp1 & 2) >>1;
LCD_D6 = (temp1 & 4) >>2;
LCD_D7 = (temp1 & 8) >>3;
LCD_OK();
}



//----------Chuong trinh con ghi mot ky tu o che do 4 bit--------------------------
void LCD_DATA (unsigned char dat)
{
unsigned temp2;
LCD_RW = 0;
LCD_RS = 1; //Dat che do xuat du lieu
temp2 = dat >> 4; //Lay 4 bit cao
LCD_D4 = temp2 & 1; //Xuat 4 bit cao
LCD_D5 = (temp2 & 2) >>1;
LCD_D6 = (temp2 & 4) >>2;
LCD_D7 = (temp2 & 8) >>3;
LCD_OK();
temp2 = dat & 0x0F; //Lay 4 bit thap
LCD_D4 = temp2 & 1; //Xuat 4 bit thap
LCD_D5 = (temp2 & 2) >>1;
LCD_D6 = (temp2 & 4) >>2;
LCD_D7 = (temp2 & 8) >>3;
LCD_OK();
Delay_ms(5);
}

//-----------Chuong trinh con hien thi 1 chuoi ky tu--------------------------------------------------------------------
void lcd_putstr(char *buffer)
{

while(*buffer != '\0')
{
LCD_DATA(*buffer); /* calling another function */
/* to write each char to the lcd module */
buffer++;
Delay_ms(2);
}
}

//-----------Chuong trinh con nhay den cot x, dong y-------------------------------------------------------------------
void lcd_gotoxy(int x, int y)
{
int address;
if(y != 1) address = lcd_line_two;
else address=0;

address += x-1;
LCD_CMD( 0x80 | address);
Delay_ms(2);
}