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TMS320F28377D usb_dev_bulk 数据传输问题

Other Parts Discussed in Thread: TMS320F28377D

我用的芯片是TMS320F28377D  

使用例程“usb_dev_bulk“

在例程上修改数据传输长度(bulk传输最大64字节),运行后只能传输32字节,收发都只能传输32字节(数据缓冲区64字节,数据产送长度64字节)。

请高手指点,问题出在哪。

谢谢!