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MSP430 USB enumeration

Other Parts Discussed in Thread: MSP430F5507


I have a trouble with USB function of MSP430.

I would like to ask about it.

The phenomenon is :

When connects MSP430 (MSP430F5507) with PC(Windows 7),"no action" was occured on the PC.

The device list on Windows doesn't include MSP430, and no error message was displayed on PC.

I used the USB CDC example of USB Developers package.

I use XT2 clock for USB,and the frequency is 4MHz, and with XT2 Bypass mode.

I checked the waveform of the USB clock on a oscilloscope ,and that was correct.

When the USB cable is connected to the PC,the USB device state on MSP430 USB Api is "ST_ENUM_IN_PROGRESS",

and the state would not changed from it to another one.

Would you please tell me some hints about this issue ?

I would appriciate if someone could reply to my question.



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