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AM3715 wince USBHost无法识别设备



开发板:DevKit8500A(am3715)

OS :  wince6.0 

组件选择:

驱动添加USB HOST

现象:

U盘接入USBhost端口,可以正确识别,但是其他设备如SD卡读卡器、鼠标、USB转串口(驱动已安装)均无法识别,而且被其他设备插入后,U盘再接入也无法识别。使用开发板提供的镜像亦如此,望知道原因的高手指点一二!