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

Pardon the very long lines. This has been fixed now.

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
(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

--- (2) Test for 12 bytes TX/RX and writing the extra 1 byte bulk packet ---
(12 byte tx/rx: run program for first time)
f7a2c440 233557145 S Co:029:00 s 00 09 0001 0000 0000 0
f7a2c440 233557308 C Co:029:00 0 0
f745b840 233559123 S Bo:029:02 -115 12 = 00000000 00000000 00000000
f745b840 233559164 C Bo:029:02 0 12 >
f745b840 233559314 S Bi:029:06 -115 12 <
f745b840 233559413 C Bi:029:06 0 12 = 00000000 00000000 00000000
f745b840 233559549 S Bo:029:02 -115 1 = 58
f745b840 233559664 C Bo:029:02 0 1 >
f745b840 233562976 S Co:029:00 s 01 0b 0000 0000 0000 0
f745b840 233563166 C Co:029:00 0 0
(12 byte tx/rx: run program for 2nd time)
c4e77ac0 234733610 S Co:029:00 s 00 09 0001 0000 0000 0
c4e77ac0 234733742 C Co:029:00 0 0
c4e77ac0 234734315 S Bo:029:02 -115 12 = 00000000 00000000 00000000
c4e77ac0 234734355 C Bo:029:02 0 12 >
c4e77ac0 234734524 S Bi:029:06 -115 12 <
c4e77ac0 234734607 C Bi:029:06 0 12 = 00000000 00000000 00000000
c4e77ac0 234734749 S Bo:029:02 -115 1 = 58
c4e77ac0 234734857 C Bo:029:02 0 1 >
c4e77ac0 234739116 S Co:029:00 s 01 0b 0000 0000 0000 0
c4e77ac0 234739234 C Co:029:00 0 0
---

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

 - Stephan

> On Fri, 9 Feb 2007, Stephan Esterhuizen wrote:
> 
> > I'm using Cypress bulkloop.hex firmware on an fx2lp (CY7C68013A) with
> > simple host-side user-land code to transmit data to EP2 (out endpoint)
> > and read the 'echo' on EP6 (in endpoint). The very first time the code
> > is run it writes, say, 60 bytes to EP2 and reads the echo (60 bytes)
> > from EP6. When the host code is run again I get a timeout on EP6.
> > Further digging shows that during the second time the program was run
> > EP2 never actually received any data even though a URB trace shows it
> > was successfully sent:
> > 
> > ehci_hcd 0000:00:1d.7: ehci_urb_done 3 urb efd87840 ep2out status 0
> > len 60/60
> > 
> > This can be 'fixed' by forcing an extra 1-byte bulk out packet to EP2
> > at the end of the code (before closing the handle). When the program
> > is _then_ run the next time it sends 60 bytes and receives 60 bytes
> > just fine (whatever happened to that extra 1-byte packet I don't know)
> 
> ...
> 
> > I'm using the 2.6.19 kernel on an Intel 82801G ICH7 controller. I
> > reproduced this on older kernels and on a 2.6.17 AMD64 system with a
> > VIA chipset.
> > 
> > Any insights would be very helpful.
> 
> Try using the usbmon facility (instructions in the kernel source file 
> Documentation/usb/usbmon.txt) to see what's really happening.
> 
> [And please instruct your email client to wrap lines at 74 columns or 
> thereabouts.]
> 
> Alan Stern
> 

-- 


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