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TM4C USB例程的速度测试

最近跑了一下1294xl的评估板USB例程,发现usb_bulk泡在win7上的单向速率大概才64kbps。这感觉相当于Low-Speed设备啊,是我配置的有问题吗?

计时方式就是在windows的例程中添加了systime的打印