On 2021-01-31 12:58, Kevin Grant wrote:
Hello,
I am re-using a subject line from the mailing list archive, by user
Marcin, in an attempt to append to that thread.
https://sourceforge.net/p/pyusb/mailman/pyusb-users/thread/15e9538f-386f-a637-ce2b-5eea3d04bd76%40gmail.com/
I had a simlar issue recently with a simple test application which
opened a device and sent some OUT packets (to 512 size endpoint) thus:
..open device..
for i in range(n):
dev.write(2,bytearray(os.urandom(512))
..close device..
On windows, this worked fine for any 'n' but on Linux only even 'n'
worked correctly. For odd 'n' one packet was always dropped/stuck.
As Marcin suggested, ending with dev.reset() seemed to flush this stuck
packet and fixed the issue.
But using reset in this way seems wrong.
After opening the device calling
dev.clear_halt(2)
Seemed to fix the issue.
Regards
Kevin
Ah, perhaps a better solution is to write a zero-length packet to
signify end of data stream...
..open device..
for i in range(n):
dev.write(2,bytearray(os.urandom(512))
dev.write(0x02, bytearray()) #ZLP end of data
..close device..
Regards
Kevin
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