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Author Topic: Debugging new USB Hub design and suspicious device driver.  (Read 39196 times)

guscrown

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Re: Debugging new USB Hub design and suspicious device driver.
« Reply #30 on: February 13, 2014, 07:05:33 pm »
Jan,

While I wait for the device desginer to reply to my questions I want to continue testing my USB 1.1 Full Speed Hub. Any recommended functionality test that I can perform? Most of the USB-IF stuff I see on usb.org is for highspeed devicex and hubs, which do not apply to me. In this spin of the board I am not planning on sending it to pre-cert testing, I will wait one more prototype as I can improve somewhat on the layout.

But functionality testing outside of just testing my devices work would be ideal. What do you recommend?
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Jan Axelson

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Re: Debugging new USB Hub design and suspicious device driver.
« Reply #31 on: February 13, 2014, 08:50:34 pm »
There is nothing wrong with a request for a 4096-byte bulk transfer that, for example, an application sends to a printer driver. Further down the stack, the host controller schedules the transfer in multiple transactions of 64 bytes each.
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Jan Axelson

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Re: Debugging new USB Hub design and suspicious device driver.
« Reply #32 on: February 15, 2014, 08:22:10 am »
The USB-IF's compliance tests are the best tests I know of.

http://www.usb.org/developers/tools/usb20_tools/
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