Ok, I haven't used libusb directly before but to me it seems that the
libFTDI's callback function needs to be modified to support this..
15.1.2014 11.40 kirjoitti "Janne Heikkinen" <[email protected]>:
> I tried using libusb_handle_events_timeout() but had no luck with it and
> then I tried to add simple timeout like this:
>
> int ftdi_transfer_data_done(struct ftdi_transfer_control *tc)
> {
> int ret;
>
> uint32_t t0 = msec_time();
>
> while (!tc->completed)
> {
> ret = libusb_handle_events(tc->ftdi->usb_ctx);
>
> if (time_diff(msec_time(), t0) > (int32_t)1000)
> ret = LIBUSB_ERROR_TIMEOUT;
>
> if (ret < 0)
> {
> if (ret == LIBUSB_ERROR_INTERRUPTED)
> continue;
> libusb_cancel_transfer(tc->transfer);
> while (!tc->completed)
> if (libusb_handle_events(tc->ftdi->usb_ctx) < 0)
> break;
> libusb_free_transfer(tc->transfer);
> free (tc);
> return ret;
> }
> }
>
>
> But now this hangs in the inner while(!tc->completed) loop.
>
> On Tue, Jan 14, 2014 at 10:20 PM, Janne Heikkinen
> <[email protected]> wrote:
> > Hi,
> >
> > I've been using code like to to read from FT2232H is sync FIFO245 mode:
> >
> > struct ftdi_transfer_control *c = ftdi_read_data_submit(ftdi,
> > lpBuffer, dwBytesToRead);
> >
> > int ret = ftdi_transfer_data_done(c);
> >
> > I was expecting ftdi_transfer_data_done() to timeout after the default
> timeout
> > which seems to be 5 seconds if there is no data to read but it seems to
> hang
> > instead?
> >
> > - Janne
>
--
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