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CC2540 驱动问题

Other Parts Discussed in Thread: CC2540

TI工程师你好:

前几天拿了CC2540 USB  Dongle*2及CC Debuger*1 

步骤一:安装BLE-CC254x-1.4.0
步骤二:驱动USB适配器及CC Debuge,在设备管理器里面会显示TI CC2540 USB CDC Serial Port(COMX)已经成功 
步骤三:透过IAR或flash来烧入TI给的范例程序,但问题来了,只要我烧入BLE\ HostTestApp以外的程序,在装置管理器里面会找不到USB Dongle这个装置,也就是这行TI CC2540 USB CDC Serial Port(COMX)会消失,而启用BTool会找不到USB Dongle的端口,除非烧入HostTestApp这程序

请问这是什么原因 ? 疑惑了几天有了