Re: FX2 Bulk In/Out fails with bulkloop.hex

On Fri, 9 Feb 2007, Stephan Esterhuizen wrote:

> My usbmon shows the following:
> 
> --- (1) Test for 12 bytes TX/RX _without_ writing the extra 1 byte bulk
> --- packet --- 
> (12 byte tx/rx: run program for first time)
> eb13c640 4268765364 S Co:028:00 s 00 09 0001 0000 0000 0
> eb13c640 4268765473 C Co:028:00 0 0
> eb13c640 4268767715 S Bo:028:02 -115 12 = 00000000 00000000 00000000
> eb13c640 4268767847 C Bo:028:02 0 12 >
> eb13c640 4268767994 S Bi:028:06 -115 12 <
> eb13c640 4268768094 C Bi:028:06 0 12 = 00000000 00000000 00000000
> eb13c640 4268771222 S Co:028:00 s 01 0b 0000 0000 0000 0
> eb13c640 4268771347 C Co:028:00 0 0

Notice those last two lines?  They are a Set-Interface request, sent
automatically by usbcore when a driver unbinds from a device.  Apparently 
your device doesn't handle the request correctly.  That must be why your 
test failed.

> (12 byte tx/rx: run program for 2nd time)
> eb149740 4271189686 S Co:028:00 s 00 09 0001 0000 0000 0
> eb149740 4271189871 C Co:028:00 0 0
> c4e77ac0 4271197255 S Bo:028:02 -115 12 = 00000000 00000000 00000000
> c4e77ac0 4271197366 C Bo:028:02 0 12 >
> c4e77ac0 4271197507 S Bi:028:06 -115 12 <
> c4e77ac0 4271698658 C Bi:028:06 -2 0
> c4e77ac0 4271698758 S Co:028:00 s 01 0b 0000 0000 0000 0
> c4e77ac0 4271698902 C Co:028:00 0 0

> It appears that test 1 (without the 1 extra byte bulk packet) fails on the
> bulk read with error -2: -ENOENT(?).

That error code indicates the read was cancelled, presumably when it timed
out after 500 ms.  See the kernel source file 
Documentation/usb/error-codes.txt.

>  I still think this might not be where
> the problem lies because if I do _not_ do that second read and check the
> FX2 status registers I find that the 2nd OUT packet never arrived at the
> FX2's EP.

Nope, the second OUT packet definitely arrived.  I know for certain,
because the host received an ACK in response -- it's in your usbmon log.  
Probably you were misled because the Set-Interface request cleared the 
FX2's EP.

Alan Stern


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