Re: [Libusb-win32-devel] (no subject)

[Xiaofan C. <xia...@gm...>]

2012/4/16 Yusuf Sekman <ys...@gm...>:
> Here is the output of TestLibUsb :
>
>       bEndpointAddress: 81h
>       bmAttributes:     02h
>       wMaxPacketSize:   64
>       bInterval:        0
>       bRefresh:         0
>       bSynchAddress:    0

Probably you have a firmware bug. For bulk transfer, you may
need to add a ZLP (zero length package) if the transfer length
is the multiple of the wMacPacketSize.

If that does not help, you may have other firmware bugs. Try change
wMaxPacketSize of EP1 IN (0x81) from  64 to 2 and send only 2 bytes
to the PC. This is because you mentioned that the buffer size of EP1 FIFO
Register in C5515 DSP is 2bytes and you may have bugs trying to send
64bytes. You still need to send a ZLP if the transfer size is multiple of the
wMaxPacketSize.

Reference:
http://www.microchip.com/forums/m325655-print.aspx

-- 
Xiaofan