Dear all
I do have the following problem occurring when using libusbXXX under Windows
I am developing sdr software and currently, cheap RTL2832U based sticks are
a hop topic. My software
also supports these kinds of sticks. This is the issue
a. when using driver software which on its turn used libusb-1.0.9, it is
(virtually) impossible to change
frequency while data transfers are going on. Even when stopping the
data transfer, rapidly changing frequencies will lead to a complete halt of
the software (obviously changing frequencies causes some control
communications through the USB port). Changing frequencies with a rate
faster than once per second will block everything within seconds. On slower
machines the problem occurs sooner than on faster ones, however, I managed
to create the problem on all of my laptops.
This is however, not the case when using libusbx-1.0.12, then
everything works fine.
HOWEVER:
b. I got many complaints of some users with various types of sticks that
the software that there are usb-read and write errors when using software
which is built from exactly the same sources, when using libusbx-1.012
(obviously then,
when using software using libusb-1.0.9, they can use the stick and complain
about the issue mentioned under (a)
The (b) problem does not show up always, I do have three laptops of
various age (7 years with XP, 4 years with Vista and 0.2 years with W7)
which do not show the problem described in (b), I do have the problem
described in (a) on all three of them.
The problems do only occur with Windows, I know some people run the
software on Linux and there is no problem whatsoever.
Any suggestion?
--
Jan van Katwijk
+31 (0)15 3698980
+31 (0) 628260355
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