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F28377的USB问题



最近在调试USB,使用例程,电脑能扫描到设备,在中断“f28x_USB0DeviceIntHandler”设置断点,当把USB先拔掉后,USB中断也不断进,单步查看USBIS标志都是SOF:都没有线缆了,怎么还有new frame标志呢?

谢谢