add cursor

lcd.h

@@ -42,6 +42,7 @@ void lcd_print_str (char *str);
 void lcd_write_P (const char *Buffer,...);
 
 void lcd_set_position(uint8_t row, uint8_t col);
+void lcd_cursor(uint8_t en);
 
 #define lcd_write(format, args...)   lcd_write_P(PSTR(format) , ## args)