2010-05-19 05:07:16     BF527 EZKIT board, USB OTG Host cannot recognise our USB wifi dangle

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2010-05-19 05:07:16     BF527 EZKIT board, USB OTG Host cannot recognise our USB wifi dangle

Xin Xin (CHINA)

Message: 89539   

 

Hi,

 

     The distribution is 2009R1-RC6, and USB dangle is Ralink RT2571. But the system can recognise the USB disk.

 

After the USB disk has been recognised, plugin the Wifi dangle, the USB host hasn't any response.

 

   If you first plugin the Wifi, the Host reports "cannot set address, return -110"

 

Best Regards

 

Xin

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2010-05-19 10:50:40     Re: BF527 EZKIT board, USB OTG Host cannot recognise our USB wifi dangle

Robin Getz (UNITED STATES)

Message: 89551   

 

Xin:

 

Does it work on an x86 host?

 

-Robin

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2010-05-20 01:10:01     Re: BF527 EZKIT board, USB OTG Host cannot recognise our USB wifi dangle

Cliff Cai (CHINA)

Message: 89569   

 

Hi Xin,

 

Trough the usb analyzer,I can see that it fails at the hardware negotiation stage before  host can sent out any packet.

 

So,I guess it's a problem related to HW circuit of usb part on B527-ezkit.

 

 

 

Cliff

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2010-05-20 03:19:58     Re: BF527 EZKIT board, USB OTG Host cannot recognise our USB wifi dangle

Xin Xin (CHINA)

Message: 89585   

 

Hi Robin,

 

   It works well at X86.

 

Best Regards

 

Xin

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2010-05-20 03:21:46     Re: BF527 EZKIT board, USB OTG Host cannot recognise our USB wifi dangle

Xin Xin (CHINA)

Message: 89586   

 

HI Cliff,

 

    Could it be fixed? We will try the test wifi by host USB.

 

Best Regards

 

Xin

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2010-05-20 10:09:34     Re: BF527 EZKIT board, USB OTG Host cannot recognise our USB wifi dangle

Robin Getz (UNITED STATES)

Message: 89593   

 

Xin:

 

Can you put a scope on VBus, and see if there are any glitches? If it drops below 4.40 Volt during device initialization, it normally means there isn't a large enough cap on the VBus line.

 

-Robin

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