如图所示，蓝色框的按钮怎么用？还有当这块开发板通过USB与电脑连接起来是，需要对这个按钮进行什么操作？
或者是在烧写程序时，该对他进行什么操作?
ti的用户手册，有这么一段关于SBL的描述：Hold the button down while attaching the F5529 LaunchPad to the USB host, continue to hold it for approximately one second after attaching, and then release. (This assumes the F5529 LaunchPad was unpowered prior to attaching, which allows a power-up event to occur.) The target F5529 should enumerate under USB BSL control as a HID interface. The USB BSL has its own vendor ID (VID) and product ID (PID), the codes used in USB to separate one USB product from another. The BSL's VID and PID pair is 0x2047 and 0x0200.
我理解不是很清楚，帮忙分析一下，谢谢！
