[Mr.Bi]

Đây là code LCD4bit , mình chỉnh lại từ code của anh Linh

#define E            PIN_D0
#define RS          PIN_D1
#define RW          PIN_D2
#define LCD_D4      PIN_D4
#define LCD_D5      PIN_D5
#define LCD_D6      PIN_D6
#define LCD_D7      PIN_D7

void LCD_Init ( void );                    // ham khoi tao LCD
void LCD_SetPosition ( unsigned int data );//Thiet lap vi tri con tro
void LCD_PutChar ( unsigned int data );    // Ham viet1kitu/1chuoi len LCD
void LCD_PutCmd ( unsigned int data ) ;    // Ham gui lenh len LCD
void send_to_LCD( unsigned int data); 

void LCD_Init ( void )
{
    delay_ms(200); // thoi gian de LCD khoi dong

    output_low(RW);        // RW = 0
    output_low(RS);        // che do gui lenh

    send_to_LCD( 0x00 );
    output_high ( E ); output_low ( E ); delay_ms ( 10 );


    send_to_LCD( 0x03 );  /* init with specific nibbles to start 4-bit mode */
    output_high ( E ); output_low ( E ); delay_ms ( 3 ); // tao xung tren chan E
    output_high ( E ); output_low ( E ); delay_ms ( 3 );
    output_high ( E ); output_low ( E ); delay_ms ( 3 );

    send_to_LCD( 0x02 );  /* set 4-bit interface */
    output_high ( E ); output_low ( E ); delay_ms ( 3 ); // tao xung tren chan E


    LCD_PutCmd ( 0x2C );    /* function set (all lines, 5x7 characters) */
    LCD_PutCmd ( 0x0C);    /* display ON, cursor off, no blink */
    LCD_PutCmd ( 0x06 );    /* entry mode set, increment & scroll left */
    LCD_PutCmd ( 0x01 );    /* clear display */
}

void LCD_SetPosition ( unsigned int data )
{

    send_to_LCD( swap ( data ) | 0x08 );
    output_high ( E ); output_low ( E ); delay_ms ( 3 ); // tao xung tren chan E

    send_to_LCD( swap ( data ) );
    output_high ( E ); output_low ( E ); delay_ms ( 3 ); // tao xung tren chan E

}

void LCD_PutChar ( unsigned int data )
{
    output_high( RS ); //RS = 1
    output_low ( RW ); //RW = 0

    send_to_LCD( swap ( data ) );                        // gui 4 bit cao
    output_high ( E ); output_low ( E ); delay_ms ( 3 ); // tao xung tren chan E

    send_to_LCD( swap ( data ) );                        //gui 4 bit thap
    output_high ( E ); output_low ( E ); delay_ms ( 3 ); // tao xung tren chan E

}

void LCD_PutCmd ( unsigned int data )
{
    output_low(RS); // RS = 0
    output_low(RW); // RW = 0

    send_to_LCD( swap(data) );    // gui 4 bit cao
    output_high (E); output_low (E); delay_ms (3);

    send_to_LCD( swap(data) );    // gui 4 bit thap
    output_high (E); output_low (E); delay_ms ( 3 );
}


void send_to_LCD( unsigned int data )
{
    output_bit ( LCD_D4, data & 0x01 );
    output_bit ( LCD_D5, data & 0x02 );
    output_bit ( LCD_D6, data & 0x04 );
    output_bit ( LCD_D7, data & 0x08 );
}

bạn thick xuất PORT nào thì cứ thế mà chỉnh lại