lcd.h

#ifndef _LCD_H_
    #define _LCD_H_
    
    #include <htc.h>
    // Khai bao tan so thach anh dao dong
    #ifndef _XTAL_FREQ
        #define _XTAL_FREQ 4000000
    #endif
    // Cac khai bao dieu khien bat/tat hien thi
    #define DON 0b00001111        // Bat hien thi
    #define DOFF 0b00001011       // Tat hien thi
    #define CURSOR_ON 0b00001111  // Bat con tro
    #define CURSOR_OFF 0b00001101 // Tat con tro
    #define BLINK_ON 0b00001111   // Nhap nhay con tro
    #define BLINK_OFF 0b00001110  // Khong nhap nhay con tro
    // Cac khai bao dich chuyen hien thi va con tro
    #define SHIFT_CUR_LEFT 0b00000100   // Con tro dich sang trai
    #define SHIFT_CUR_RIGHT 0b00000101  // Con tro dich sang phai
    #define SHIFT_DISP_LEFT 0b00000110  // Hien thi dich sang trai
    #define SHIFT_DISP_RIGHT 0b00000111 // Hien thi dich sang phai
    // Cac khai bao thiet lap chuc nang
    #define FOUR_BIT 0b00101100  // Giao dien 4-bit
    #define EIGHT_BIT 0b00111100 // Giao dien 8-bit
    #define LINE_5X7 0b00110000  // Ky tu 5x7, mot hang
    #define LINE_5X10 0b00110100 // Ky tu 5x10
    #define LINES_5X7 0b00111000 // Ky tu 5x7, nhieu hang
    // Cac khai bao ket noi chan LCD voi PIC
    #ifndef LCD_RS
        #define LCD_RS RD1
        #define LCD_EN RD3
        #define LCD_RW RD2
        #define LCD_DATA4 RD4
        #define LCD_DATA5 RD5
        #define LCD_DATA6 RD6
        #define LCD_DATA7 RD7
        #define LCD_RS_TRIS TRISD1
        #define LCD_EN_TRIS TRISD3
        #define LCD_RW_TRIS TRISD2
        #define LCD_DATA4_TRIS TRISD4
        #define LCD_DATA5_TRIS TRISD5
        #define LCD_DATA6_TRIS TRISD6
        #define LCD_DATA7_TRIS TRISD7
    #endif
    // Khai bao bien du lieu 8-bit
    typedef union _BYTE_VAL
    {
        unsigned char Val;
        struct
        {
            unsigned char b0 : 1;
            unsigned char b1 : 1;
            unsigned char b2 : 1;
            unsigned char b3 : 1;
            unsigned char b4 : 1;
            unsigned char b5 : 1;
            unsigned char b6 : 1;
            unsigned char b7 : 1;
        } bits;
    } BYTE_VAL;
    // Khai bao cac lenh dung cho LCD
    void lcd_init();                                       // Khoi dong LCD.
    unsigned char lcd_busy();                              // Thong bao LCD ban xu ly thong tin.
    unsigned char lcd_get_byte(unsigned char rs);          // Doc mot byte du lieu tu LCD.
    void lcd_put_byte(unsigned char a, unsigned char b);   // Ghi mot byte du lieu/lenh den LCD.
    void lcd_gotoxy(unsigned char col, unsigned char row); // Dinh toa do tren LCD.
    void lcd_putc(char c);                                 // Ghi mot ky tu den LCD.
    void lcd_puts(const char *s);                          // Ghi mot chuoi den LCD.
#endif