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TMS320F28379D: USB模块中自带的TEST模式怎么实现?

Part Number: TMS320F28379D

1.请问在USB模块中自带的TEST模式,如何实现?

2.我在main函数中,启动该模块后,使用HWREG函数向USBTEST寄存器的地址写值,写不进去。

3.在CCS 软件的寄存器窗口中修改USBTEST寄存器的值也无法修改,请问这个TEST模式需要怎么实现?