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USB feature - question #33

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szoshi opened this issue Sep 12, 2021 · 0 comments
Open

USB feature - question #33

szoshi opened this issue Sep 12, 2021 · 0 comments

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@szoshi
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szoshi commented Sep 12, 2021

I am using your ulpi_serial module to implement a simple usb fs peripheral. I am using it on an Artix A7 FPGA. I have no problem with the compilation. On connecting, Windows recognises that a device has been connected and tries to enumerate it but always fails. I could use the Xilinx ILA to see that the usb device receives the GET_DESCRIPTOR request and also sends an acknowledge by writing 0x42 to the ULPI chip. It appears though that the necessary USB transmission is never generated as the PC keeps repeating the GET_DESCRIPTOR message till the whole operation times out.

My PHY is a USB3300. Did you guys face any similar issues whe trying to get USB to work? Any tips would be appreciated.

Regards,

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