I have a device which on a USB 2.0 bus shows that it has
an Isochronous Input endpoint as
Attributes: 0x84 (IN)
Attributes: 0x01 (Isochronous)
Max Packet Size: 4
Polling Interval: 4 ms <<<<----------------------------
should be 1
The sample rate is expressed as a 16.16 format rather than the older
10.14 format.
In the following snippet
assocEndpoint.direction = kUSBIn;
assocEndpoint.maxPacketSize = 4;
assocEndpoint.interval = 0xff;
if (assocPipe)
// following line crashes quite often
result = assocPipe->Read(reqSRDesc, nextSynchReadFrame, 1,
&srFrame, &completion);
Questions
a. In the case of USB 2.0 would I be getting the correct pipe using
FindNextPipe()?
b. What could be causing the crash when Read is called?
Thanks,
David
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