Em dùng explorer 16 và code lại theo TUT của anh Nam nhưng không thấy LCD hiện gì, em debug với ICD2 mà không chạy
RD4 EN
RD5 RW
RD15 RS
các chân data RE(RE0-RE7)
em dùng C30
anh xem hộ em sai chỗ nào với ạ, em cảm ơn
code:
#include <p33FJ256GP710.h>
_FOSCSEL(FNOSC_FRC)
_FOSC(FCKSM_CSECMD & OSCIOFNC_OFF & POSCMD_XT);
_FWDT(FWDTEN_OFF);
// _FBORPOR(PBOR_OFF & MCLR_EN & PWMxL_ACT_HI & PWMxH_ACT_HI);
_FGS(GSS_OFF);
//------------------------------------------------------------------------------
//Cac hang so cua chuong trinh (gia tri tuc thoi dung trong chuong trinh)
#define ms_count 125 //So dem tuong ung voi 1 ms, cho timer 1
#define LCD_EN _LATD4 //Tin hieu Enable cho LCD, chan RD4
#define LCD_RW _LATD5 //Tin hieu Read/Write cho LCD, chan RD5
#define LCD_RS _LATD15 //Tin hieu Reset cho LCD, chan RD15
#define LCD_DAT LATE //Cac tin hieu Data cho LCD, chan RE0..RE7
#define LCD_TRIS TRISE //Tristate cua cac tin hieu Data cho 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
//Cac prototype cho cac chuong trinh con
void Init_PORTS(void); //Khoi tao cac cong I/O
void Init_TMR1(void); //Khoi tao Timer 1
void Delay_ms(unsigned int); //Tao tre mot so ms
void Init_LCD(void); //Khoi tao LCD
void LCD_cmd4(unsigned char); //Xuat lenh ra LCD qua giao tiep 4-bit
void LCD_dat4(unsigned char); //Xuat du lieu ra LCD qua giao tiep 4-bit
//Bang hang so trong ROM
const unsigned char __attribute__ ((space(psv), address (0x0400)))
//Chuoi ky tu se xuat ra LCD
Chuoi1[]="Hello world!\0"; //Chuoi ky tu se duoc xuat ra LCD
//Cac bien toan cuc
unsigned char time_out, idx;
//------------------------------------------------------------------------------
//Chuong trinh chinh
int main(void) {
_PLLPRE = 0;
_PLLPOST = 1;
_PLLDIV = 30;
while( _COSC != 0b001 ){
Init_TMR1(); //Khoi tao cho TMR1
Init_PORTS(); //Khoi tao cac cong I/O
_PSV=1;
PSVPAG = __builtin_psvpage(Chuoi1);
idx = 0;
Delay_ms(50);
Init_LCD();
Delay_ms(500);
while (Chuoi1[idx]) { //Xuat chuoi ra dong thu nhat cua LCD
LCD_dat4(Chuoi1[idx++]);
Delay_ms(1);
};
LCD_cmd4(LCD_homeL2);
Delay_ms(1);
idx = 0;
while (Chuoi1[idx]) { //Xuat chuoi ra dong thu hai cua LCD
LCD_dat4(Chuoi1[idx]);
Delay_ms(1);
idx ++;
};
while (1) {}; //Vong lap chinh
}
}
//Chuong trinh con khoi tao Timer 1
//TMR1 duoc dung de dem so ms troi qua, o muc xung 8 Mips (fcy = 8 MHz)
//------------------------------------------------------------------------------
void Init_TMR1(void) {
TMR1 = 0; //Xoa so dem trong TMR1
PR1 = ms_count; //TMR1 tran moi ms
_T1IF = 0; //Xoa co ngat cua Timer 1
T1CON = 0x0030; //Dung fcy lam clock, prescale = 1:64, tat Timer 1
_T1IE = 1; //Cho phep ngat Timer 1
}
//Chuong trinh con khoi tao cac cong I/O, de noi voi LED
//------------------------------------------------------------------------------
void Init_PORTS(void) {
LCD_DAT = 0xFF00; //Xoa cac bit chot du lieu LCD
LCD_TRIS = 0xFF00; //Cac chan du lieu LCD la ngo ra
LCD_EN = 0;
_TRISD4 = 0; //RD4 la ngo ra, noi vao Enable cua LCD
LCD_RW = 0;
_TRISD5 = 0; //RD5 la ngo ra, noi vao R/W cua LCD
LCD_RS = 0;
_TRISD15 = 0; //RD15 la ngo ra, noi vao Reset cua LCD
}
//Chuong trinh con delay bang timer 1, nhan 1 tham so la so ms can delay
//------------------------------------------------------------------------------
void Delay_ms(unsigned n) {
PR1 = n * ms_count; //Dat nguong tran vao PR1
T1CONbits.TON = 1; //Bat timer 1
}
//Chuong trinh con khoi tao module LCD
//------------------------------------------------------------------------------
void Init_LCD(void) {
LCD_cmd4(LCD_4b2l); //Dat che do giao tiep 4-bit, man hinh 2 dong
Delay_ms(1);
LCD_cmd4(LCD_off); //Tat man hinh
Delay_ms(1);
LCD_cmd4(LCD_normal); //Che do nhap du lieu binh thuong
Delay_ms(1);
LCD_cmd4(LCD_on_blink); //Bat man hinh, hien con tro nhap nhay
Delay_ms(1);
LCD_cmd4(LCD_clear); //Xoa man hinh
Delay_ms(5);
}
//Chuong trinh con xuat lenh o che do 4 bit
//------------------------------------------------------------------------------
void LCD_cmd4(unsigned char cmd) {
unsigned temp1, i;
LCD_RW = 0;
LCD_RS = 0; //Dat che do xuat lenh
temp1 = LCD_DAT & 0xFF00; //Lay trang thai hien thoi cua LCD_DAT
LCD_DAT = temp1 | (cmd ); //Xuat 4 bit cao
LCD_EN = 1; //Tao xung Enable
for (i = 0; i < 8; i++); //keo dai toi thieu 1 us
LCD_EN = 0;
}
//Chuong trinh con xuat du lieu o che do 4 bit
//------------------------------------------------------------------------------
void LCD_dat4(unsigned char dat) {
unsigned temp2, i;
LCD_RW = 0;
LCD_RS = 1; //Dat che do xuat du lieu
temp2 = LCD_DAT & 0xFF00; //Lay trang thai hien thoi cua LCD_DAT
LCD_DAT = temp2 | (dat ); //Xuat 4 bit cao
LCD_EN = 1; //Tao xung Enable
for (i = 0; i < 8; i++); //keo dai toi thieu 1 us
LCD_EN = 0;
}
//Chuong trinh xu ly ngat Timer 1
//------------------------------------------------------------------------------
void _ISR _T1Interrupt(void) {
T1CONbits.TON = 0; //Tat timer 1
_T1IF = 0; //Xoa co ngat
TMR1 = 0;
}