Hi!
I have also posted my question in the libusb list but got no reply so far, so I try my luck here. I hope that there are more experts reading here. My question is whether submitting multiple transfers in parallel and handling the results (by checking in the callback function which of the transfers actually called back during "handle events") is possible in libusbx?
In particular, I am trying to mix multiple transfers using the asynch interface like this:
1. On EP1 I have a periodic bulk IN transfer which I submit and after 1 s I call "handle events" to fetch its results. Then I resubmit this transfer and so on. This works fine so far.
2. I submit a bulk OUT transfer on EP2 to tell my USB device to start sending some larger amount of data to the host. This data is then fetched by another bulk IN transfer on EP3. This also work fine when used without the periodic transfer described in 1.
The problem: Unfortunately, if the periodic transfer described in 1. is running, as soon as I submit a bulk OUT on EP2 as described in 2., this pending periodic bulk IN on EP1 never calls back. It seems to "disappear" somehow. Is this expected?
FYI: All transfers have a timeout of 0 and I am handling all transfers in a single callback function and identify there which transfer actually called back.
Thanks in advance for any hints.
Regards,
Anguel
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