Re: urb->status -EOVERFLOW

Yes I know.

In fact the device respond CMDERROR  wich is more thant one byte
The command was just a simple RXCMD followed by a bulk_read 1 byte len, but
instead of giving a number between 0 and 255, The device send this string.
this mean that my command rxcdm is not supported by the device ( This
happens after some time... ) That's why I suspect and I think that the
polling spped is not well supported by the device...

The sequence is normally:

1. sending RXCMD
2. receiving 1 byte that give the len of data in the device buffer
If 2 = 0 back to step 1.
3. receiving data with len = value from step 2
4. back to step 1

My problem happens suddenly at step 2 after some time ... (This sequence is
well supported during 10 to 60 seconds by fails after that...)

So I repeat the question, may I slow down the polling ?

Alain



-----Message d'origine-----
De : [email protected]
[mailto:[email protected]] De la part de Alan
Stern
Envoyé : dimanche 22 juillet 2007 18:02
À : Alain Degreffe
Cc : [email protected]
Objet : Re: [linux-usb-devel] urb->status -EOVERFLOW

On Sun, 22 Jul 2007, Alain Degreffe wrote:

> Hi,
> 
> After a big rewriting of iuu_phoenix, I have the following problem.
> The polling is well working with callback mechanism but only during 30
> seconds maximum.
> After sometime, The read_bulk_callback give me an urb-status EOVERFLOW...
> Is the polling running to faster than the device can support ? Is there a
> way to slow down the polling ?
> The only way to recover is to reset the device ( usb_reset_device )

EOVERFLOW has nothing to do with the speed of polling.  It means that 
the device is sending more data than urb->transfer_buffer_length.

Alan Stern


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