CDC problem - My bulk in endpoint freezes after 1 transmission.

Hi all,

I have the exact same problem as described here by Cliff.

http://www.embeddedrelated.com/groups/AT91SAM/show/2053.php

However, my bulk in endpoint is set up for bulk(b0010) not iso. Does
anyone else have any ideas or tips to give me in debugging this
problem?

I have usbsniffers and can view my bulk out endpoint working
correctly. When i transmit a character out of the hyperterm I can
view it using a breakpoint at my bulk out int handler. I then put
this character into UDPRegisters->UDP_FDR[AT91C_EP_IN] and set
AT91C_UDP_TXPKTRDY. It works once then stops transmitting. TXPKTRDY
never clears TXCOMP interrupt never fires.

Please can anyone help me before I pull my hair out?

Thanks

swilson Start a New Thread

The problem with the bulk-in endpoint was caused by a
misconfiguration of the 4th endpoint, which should have been an
interrupt endpoint, but instead it was configured as iso in the
example driver. The control, bulk-in, and bulk-out endpoints were
always configured correctly.

The misconfiguration of the interrupt endpoint killed the bulk-in
endpoint on _some_ versions of host controllers. In other words, it
worked fine with some computers but didn't work with others. Recheck
the configuration of all of the endpoints.

Cliff Start a New Thread

Hi Cliff,

Thanks for the reply.

I don't have a 4th endpoint.

I have checked and rechecked my descriptors. Can you check them for
me please?

I am also using 6119.inf with usbser.sys. Is this what you were
using? I have tried using 6124.sys but I cannot get it to work with
6119.inf.



Any help is really appreciated....

Thanks

swilson Start a New Thread

--- In A..., "slouwilson78" wrote:
>
> Hi Cliff,
>
> Thanks for the reply.
>
> I don't have a 4th endpoint.

Yes, you do. :)

> // Endpoint 1 descriptor
> 0x07, // bLength
> 0x05, // bDescriptorType
> 0x83, // bEndpointAddress, Endpoint 01 - IN 333333
> 0x03, // bmAttributes INT
> 0x0a, // wMaxPacketSize
> 0x00,
> 0x00, // bInterval

The comment is wrong, this is an Endpoint 3 (the 4th endpoint)
descriptor, and it's being configured as an interrupt in. I believe
the interrupt in is required for the serial class driver whether you
use it or not (I'm not 100% sure about that).

Now make sure you have something like this in the init code:

pUDP->UDP_CSR[3] = AT91C_UDP_EPEDS | AT91C_UDP_EPTYPE_INT_IN;

That was the line that got me. I believe it was originally
indicating that endpoint 3 was an ISO endpoint.

Cliff Start a New Thread

Thanks so much for your reply.

I didn't understand this properly at all. I thought that was my
control endpoint. So I

I still have some other issues (my config set up) but its working a
lot more reliably now.

I am so relieved!

Thanks..... Start a New Thread