//
// LCD Interface
//
// This module initializes the 64x128 LCD module, declares a shadow memory
// in external memory, and provides subroutines to blank the shadow memory
// and/or copy that memory to the LCD.
//
//
// initialize LCD - Call this once at the beginning of time.
// It sets up LCD hardware, blanks the shadow memory then displays it on
// the screen.
//
void init_lcd(void);

//
// Copy shadow memory to LCD screen.
//
void refresh_screen(void);

//
// Clear the shadow memory.
//
void blank_screen(void);

//
// Shadow memory. 1024 bytes. Eight 128-byte pages. Each page corresponds
// to 8 rows of pixels. screen[0] is upper left, screen[127] is upper right,
// screen[1023] is lower right. Least significant bit of each byte is on the
// top pixel row of its page.
//
extern xdata char screen[];

//
// Handy 5x7 font that will come in handy in later labs. Always put at least
// a one pixel space between characters.
//
extern code char font5x8[];