I am using the Linux 1.0.1 implementation to communicate with a usb card
reader. I am able to get things set up correctly and recieve data from
the reader when a user swipes their card.
I am using the blocking UsbPipe.syncSubmit call in a separate thread to
get data from the reader and this works fine.
My problem is that when I want to shut down my application cleanly, I am
not able to shutdown the UsbPipe. If I just do a UsbPipe.close(), I get
an exception thrown saying that I can't close a pipe with pending
submissions. If I try to do a UsbPipe.abortAllSubmissions() this just
blocks forever. If I try to send an interrupt to the thread containing
the blocking call, it just seems to be ignored.
My code to read the data from the input UsbPipe looks like this:
int bytesRead = 0;
while ((bytesRead == 0) && !m_StopFlag) {
DefaultUsbIrp irp = new DefaultUsbIrp(getReadBuffer());
irp.setAcceptShortPacket(true);
m_InputPipe.syncSubmit(irp);
bytesRead = irp.getActualLength();
}
if (!m_StopFlag) {
// incase buffer isn't full...
return createByteArray(getReadBuffer(), bytesRead);
}
return null;
I also tried a variation with the asyncSubmit call but the number of
bytes read was always 0 but I was able to shut down the UsbPipe cleanly
this way via a UsbPipe.abortAllSubmissions().
int bytesRead = 0;
while ((bytesRead == 0) && !m_StopFlag) {
DefaultUsbIrp irp = new DefaultUsbIrp(getReadBuffer());
irp.setAcceptShortPacket(true);
m_InputPipe.asyncSubmit(irp);
bytesRead = irp.getActualLength();
if (bytesRead == 0) {
Thread.yield();
Thread.sleep(250);
}
}
Any suggestions as to what I may be doing wrong would be appreciated.
Brian
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