>>>>> "Uwe" == Uwe Bonnes <bon@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx> writes:
>>>>> "David" == David Kuehling <dvdkhlng@xxxxxx> writes:
>>>>> "Uwe" == Uwe Bonnes <bon@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx> writes:
>>>>> "David" == David Kuehling <dvdkhlng@xxxxxx> writes:
David> hi, just tried to make the ftdipp library from git head work, but
David> my test program already fails in Context::open(vendor,product).
David> The other libftdi programs supplied in the example/ directory
David> seem to work.
David> open(vendor,product) calls ftdi_usb_open(), which succeeds, then
David> calls get_strings_and_reopen(), which calls get_strings(), which
David> calls ftdi_usb_get_strings(), which fails, as it passes in d->dev
David> which hasn't been set yet.
David> Maybe the correct fix is to set d->dev to d->ftdi->dev after
David> ftdi_usb_open()?
>>> Perhaps create a small example program in the example directory that
>>> shows the error. Then create a patch to fix that error and send the
>>> patches...
David> I'm just using libftdi for the first time, and wasn't prepared to
David> debug that problem in-depth. That's why my bug report is a
David> little shallow and doesn't provide a working patch.
> I requested more the program or better a stripped down version of that
> program. That way, other may reproduce the bug and look for a fix.
Try this program:
--8<--
#include <stdio.h>
#include <assert.h>
#include <ftdi.hpp>
int main()
{
Ftdi::Context ctx;
int result;
const unsigned vendor = 0x0403;
const unsigned device = 0x6010;
result = ctx.set_interface(INTERFACE_A);
assert(result == 0);
result = ctx.open(vendor, device);
if (result)
{
fprintf(stderr, "open(): %s\n", ctx.error_string());
return 1;
}
return 0;
}
--8<--
compiles via (when saved as 'ftdibug.cpp'):
make CXXFLAGS='-I/usr/local/include/libftdi -I/usr/include/libusb-1.0 -lftdipp
-lftdi -lusb-1.0' ftdibug
This outputs:
open(): all fine
i.e. open() returns nonzero, but there's no corresponding error message.
cheers,
David
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