note, they
do observe that, so far, they've been unable to achieve a transfer speed faster
than 5,000 characters in seven minutes. It looks to me like this is exactly due
to their incorrect setting of bInterval. :-) I've sent them a note about it.
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Dave Mielke | 2213 Fox Crescent
nterval must still be interpreted the old way
if the device is operating at full or low speed. Is that correct?
If the above is correct, how can we tell from usbfs which way to interpret
bInterval?
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Phone: 1-613-726-0
Super speed.
Yes, I did know this, so maybe I misunderstood what you were wondering about.
Were you wondering why 64ms was too long?
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Dave Mielke | 2213 Fox Crescent | The Bible is the very Word of God.
Phone: 1-613-726-0014 | Ottawa, Ontario | http://Mielke.cc/bible/
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criptor. Our assumption was that since it says
it's USB 2.0 then bInterval must be intterpreted in light of that regardless of
the actual speed used for communication.
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Dave Mielke | 2213 Fox Crescent | The Bible is the very Word of God.
Phone: 1-613-726-0014 | Ottawa, Ontario | http://Mie
eard of) run at low speed, and a few of them run at
>full speed. I can't remember any running at high speed.
According to my collection of data, 5 say 1.00, 15 say 1.1, and 21 say 2.0.
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Dave Mielke | 2213 Fox Crescent | The Bible is the very Word of God.
Phone: 1-613-726-0014 |
state to
>> reset
>> its end to?
>
>Nope, sorry, see the USB spec for details :(
Thanks. I was just hoping that I'd missed something.
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Dave Mielke | 2213 Fox Crescent | The Bible is the very Word of God.
Phone: 1-613-726-0014 | Ottawa, Ontario | http://Mielke.cc/b
Using USBFS: If a device doesn't support clear halt (or, perhaps, not
properly), is there an alternative? For example, is there a way to ask which
state the device's data toggle is in and then tell the host what state to reset
its end to?
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Dave Mielke | 2213 Fox Crescent
and VMIN to 0. This should do
non-blocking reads that return 0 (something our code always successfully does
with ttyS devices) but, with the ttyACM device, the read blocks. Is this
expected behaviour for ttyACM devices?
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Dave Mielke | 2213 Fox Crescent | The Bible is the very Word
of curiosity, do you know why one must poll for output (rather than for
input)?
JDoes writability precisely mean that there's at least one
user-submitted URB that can now be reaped?
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Dave Mielke | 2213 Fox Crescent | The Bible is the very Word of God.
Phone: 1-613-726-0014 | Ottawa, Ontario
to use this capability?
Can anyone point me to documentation that formally describes how it works?
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Dave Mielke | 2213 Fox Crescent | The Bible is the very Word of God.
Phone: 1-613-726-0014 | Ottawa, Ontario | http://Mielke.cc/bible/
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blocked. That lets each thread safely unblock each signal it cares about. So, I
aghree, there's no bug - just a bit of memory loss on my part.
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Dave Mielke | 2213 Fox Crescent | The Bible is the very Word of God.
Phone: 1-613-726-0014 | Ottawa, Ontario | http://Mielke.cc/bible/
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, that's only one of them - shouldn't the handling revert to the default
for that signal? Isn't it wrong that, when there are no signalfd file
descriptors open for a given signal, the signal still seems to stay pending
within the signalfd mechanism?
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Dave Mielke | 2213 Fox Crescent
disconnection?
Completion. urb-signr is set to 34 (SIGRTMIN), and that's the signal I'm
getting.
Did you turn off the device while the URB was in progress, or was the device
turned off all along?
It was turned off all along.
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Dave Mielke | 2213 Fox Crescent | The Bible is the very
be different like
that?
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Dave Mielke | 2213 Fox Crescent | The Bible is the very Word of God.
Phone: 1-613-726-0014 | Ottawa, Ontario | http://Mielke.cc/bible/
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reap
waits forever.
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to the thread that
submitted the urb or to the whole process? If to the whole process, is there a
way to redirect it to just the thread?
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Phone: 1-613-726-0014 | Ottawa, Ontario | http://Mielke.cc/bible/
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never does anything
to deliver the completion signal until a urb has actually completed then what
might it be doing to trigger a signalfd notificatoin earlier than that?
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Phone: 1-613-726-0014 | Ottawa, Ontario
whereas a signalfd notification would occur
immediately.
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expecting, it returns 0, and then
the
non-blocking reap changes to returning -1 with ENOENT.
Because when you cancel the URB, it completes.
Which also would seem to verify that there's only that one urb.
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Phone: 1
like it's specifically not being executed
if the error is -ENOENT.
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Phone: 1-613-726-0014 | Ottawa, Ontario | http://Mielke.cc/bible/
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, IOCTL_USBFS_DISCARDURB, ) instead of REAP?
If I give it the address of the urb I'm expecting, it returns 0, and then the
non-blocking reap changes to returning -1 with ENOENT.
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Dave Mielke | 2213 Fox Crescent | The Bible is the very Word of God.
Phone: 1-613-726-0014 | Ottawa, Ontario
Just like the siginfo data has fields that must be left over from somewhere
else, might it be that the user urb is copied, without clearing the signr
field, to initialize an underlying system-provided urb?
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Dave Mielke | 2213 Fox Crescent | The Bible is the very Word of God.
Phone
that?
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Dave Mielke | 2213 Fox Crescent | The Bible is the very Word of God.
Phone: 1-613-726-0014 | Ottawa, Ontario | http://Mielke.cc/bible/
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the body
application (brltty, if you're curious) is a set of event handlers
that come and go as needed. The signalfd notification is appearing on the very
first call to poll() after the urb is submitted.
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Dave Mielke | 2213 Fox Crescent | The Bible is the very Word of God.
Phone: 1-613-726-0014
completion, do you?
No, there's none of that kind of stuff in there.
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Phone: 1-613-726-0014 | Ottawa, Ontario | http://Mielke.cc/bible/
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What might it mean that ssi_addr is NULL? Is a non-user urb ever submitted
underneath that might be causing the notification?
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Dave Mielke | 2213 Fox Crescent | The Bible is the very Word of God.
Phone: 1-613-726-0014 | Ottawa, Ontario | http://Mielke.cc/bible/
EMail: d
on the previous attempt is
delivered. Flushing the signalfd file descriptor before closing it resolves the
problem. I guess we all know a little bit more about signalfd now. :-_) Thank
you for bearing with me.
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Dave Mielke | 2213 Fox Crescent | The Bible is the very Word of God.
Phone: 1-613-726
the HUPCL
termios attribute on the serial device. None of these seem to work, i.e. poll()
doesn't come out of its wait when I disconnect the USB to serial adapter. In
case it matters, I'm using 3.11.10-100.fc18.x86_64.
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Dave Mielke | 2213 Fox Crescent | The Bible is the very Word of God
when I unplugged the device.
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Dave Mielke | 2213 Fox Crescent | The Bible is the very Word of God.
Phone: 1-613-726-0014 | Ottawa, Ontario | http://Mielke.cc/bible/
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-canonical read should perhaps be
returning -1 with errno set appropriately.
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Dave Mielke | 2213 Fox Crescent | The Bible is the very Word of God.
Phone: 1-613-726-0014 | Ottawa, Ontario | http://Mielke.cc/bible/
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in ETIME because, perhaps, a lower layer fails the transfer, and then,
maybe, a higher layer sees it as a response failure?
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Dave Mielke | 2213 Fox Crescent | The Bible is the very Word of God.
Phone: 1-613-726-0014 | Ottawa, Ontario | http://Mielke.cc/bible/
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expired.
My understanding is that ETIME means that the device isn't responding. Given
that our log is showing only 10 milliseconds between the clear halt and the
bulk read, however, I'm doubting that that's the cause. What else might it be?
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Dave Mielke | 2213 Fox Crescent | The Bible
the start of the bulk transfer and the reported error.
What else might it be?
A bug in the host controller hardware or driver, perhaps. But that
seems rather unlikely.
Since it does work on Windows, I kind of doubt it.
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Dave Mielke | 2213 Fox Crescent | The Bible is the very Word
to immediate as soon as we
get data. We also only use a single URB. It works quite well.
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Dave Mielke | 2213 Fox Crescent | The Bible is the very Word of God.
Phone: 1-613-726-0014 | Ottawa, Ontario | http://Mielke.cc/bible/
EMail: d...@mielke.cc | Canada K2A 1H7 | http
which, on all platforms, will work correctly
in a portable way.
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Dave Mielke | 2213 Fox Crescent | The Bible is the very Word of God.
Phone: 1-613-726-0014 | Ottawa, Ontario | http://Mielke.cc/bible/
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---BeginMessage
for many devices. Is there a possibility, though, that the kernel support for
the CP2102 doesn't work this way?
I'd sure appreciate any help on this issue as I've been staring at it for a
couple of weeks now and haven't been able to spot the problem.
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Dave Mielke | 2213 Fox
on my own,
already.
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Dave Mielke | 2213 Fox Crescent | The Bible is the very Word of God.
Phone: 1-613-726-0014 | Ottawa, Ontario | http://Mielke.cc/bible/
EMail: d...@mielke.cc | Canada K2A 1H7 | http://FamilyRadio.com/
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