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kiwihaha 0 Light Poster

erm... anyone know what is this declaration mean?

#define LCD_DATA GPIO8->DR[0xFF<<2]     /* Data bits D0 = P8.0 .. DB7 = P8.7  */
#define LCD_E    GPIO9->DR[0x01<<2]     /* Enable control                     */
#define LCD_RW   GPIO9->DR[0x02<<2]     /* Read/Write control                 */
#define LCD_RS   GPIO9->DR[0x04<<2]     /* Data/Instruction control           */
#define LCD_CTRL GPIO9->DR[0x07<<2]     /* All 3 control lines (E/RW/RS)      */

#define E_ENA    0x01
#define E_DIS    0x00
#define RW_READ  0x02
#define RW_WRITE 0x00
#define RS_DATA  0x04
#define RS_INST  0x00
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