After first USB release unable to communicate with USB device

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venkat swaminathan

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Jan 13, 2016, 5:29:44 AM1/13/16

to Debian

Am Using Libusb 0.1 to test my printer code. The code runs as expected with 2.6.32 kernel in debian 6. However, After debian 8 upgrade we notice that printer responds for very first read operation after reboot, For rest of command executions READ fails with ENODEV.

By doing this, I lost communication with the device

1. USB_OPEN()
2. Claim the interface
3. USBBulkWriteOnEP (FW version request fro my device)
4. Release the interface
5. Claim the interface
6. USBBulkReadOnEP
7. Release the interface
8. Usb_close()
9. Loop on GOTO1.

However, if i insert USB_RESET after every read operation the command work..

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