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f28069 iso controlCARD 连接电脑提示无法识别USB设备,之前是好的

今天在做f28069的USB功能时,controlCARD仿真口连接电脑时,提示无法识别USB设备,设备管理器中也没有出现

TI XDS100 Channel A 

TI XDS100 Channel B

手头上还有一个仿真器插入电脑是好的,暂且排除电脑驱动的问题。

难道controlCARD自带的仿真器烧了,还是固件丢失了。