Once the board powers up and you see the welcome menu, don't select anything -- loading some of the examples there will change the I/O mappings and the steps you'll do later won't work.
启动该板后，将看到欢迎菜单，不要做出任何选择 ——加载那里的示例会改变I/O映射，导致后面的步骤无法进行。
This works ok if the user indeed USES this menu item, but if the user presses CTRL-O in stead they still get the original dialog.
如果用户确实使用这个菜单项，这个工作确定，但是如果用户按CTRL - O代替他们仍然得到原始的对话框。
This works ok if the user indeed USES this menu item, but if the user presses CTRL-O in stead they still get the original dialog.
如果用户确实使用这个菜单项，这个工作确定，但是如果用户按CTRL - O代替他们仍然得到原始的对话框。
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