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Thank you a lot for the assistance and thanks for the link to the discussion.
I'v understood that it is definitely not a problem in libftdi, but it's bug in kernel or in the chip itself. I will investigate the question more thoroughly.
Best regards,
Alexey Kosilin
On Sun, Jun 26, 2011 at 4:15 PM, Xiaofan Chen <xiaofanc@xxxxxxxxx> wrote:
>> Endpoint Descriptor:
>> bLength 7
>> bDescriptorType 5
>> bEndpointAddress 0x81 EP 1 IN
>> bmAttributes 2
>> Transfer Type Bulk
>> Synch Type None
>> Usage Type Data
>> wMaxPacketSize 0x0000 1x 0 bytes
>> bInterval 0
>> Endpoint Descriptor:
>> bLength 7
>> bDescriptorType 5
>> bEndpointAddress 0x02 EP 2 OUT
>> bmAttributes 2
>> Transfer Type Bulk
>> Synch Type None
>> Usage Type Data
>> wMaxPacketSize 0x0040 1x 64 bytes
>> bInterval 0
>>
> Oops, my bad, something is wrong with your device that
> wMaxPacketSize for EP1 IN is zero. In that case, how
> can it send data to the host?
>
> What is your system?
>
I search my Linux USB mailing list and indeed this is
possible. The fix should be in the kernel and not in the
user space (libftdi).
Discussion:
http://marc.info/?t=120423246300011&r=1&w=2
Somehow I do not see the patch submitted later
in the list.
libftdi - see http://www.intra2net.com/en/developer/libftdi for details.
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