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List:       libftdi
Subject:    Re: ftdi_transfer_data_done() timeout
From:       Janne Heikkinen <janne.m.heikkinen () gmail ! com>
Date:       2014-01-15 17:13:02
Message-ID: CAMEJZcG=F177j5iTpVKy+mnt3SzWudqZDePBdNumJ8fJ1eruVg () mail ! gmail ! com
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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" <janne.m.heikkinen@gmail.com>:

> 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
> <janne.m.heikkinen@gmail.com> 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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[Attachment #3 (text/html)]

<p dir="ltr">Ok, I haven&#39;t used libusb directly before but to me it seems that \
the libFTDI&#39;s callback function needs to be modified to support this..</p> <div \
class="gmail_quote">15.1.2014 11.40 kirjoitti &quot;Janne Heikkinen&quot; &lt;<a \
href="mailto:janne.m.heikkinen@gmail.com">janne.m.heikkinen@gmail.com</a>&gt;:<br \
type="attribution"><blockquote class="gmail_quote" style="margin:0 0 0 \
.8ex;border-left:1px #ccc solid;padding-left:1ex"> I tried using \
libusb_handle_events_timeout() but had no luck with it and<br> then I tried to add \
simple timeout like this:<br> <br>
int ftdi_transfer_data_done(struct ftdi_transfer_control *tc)<br>
{<br>
    int ret;<br>
<br>
    uint32_t t0 = msec_time();<br>
<br>
    while (!tc-&gt;completed)<br>
    {<br>
        ret = libusb_handle_events(tc-&gt;ftdi-&gt;usb_ctx);<br>
<br>
        if (time_diff(msec_time(), t0) &gt; (int32_t)1000)<br>
            ret = LIBUSB_ERROR_TIMEOUT;<br>
<br>
        if (ret &lt; 0)<br>
        {<br>
            if (ret == LIBUSB_ERROR_INTERRUPTED)<br>
                continue;<br>
            libusb_cancel_transfer(tc-&gt;transfer);<br>
            while (!tc-&gt;completed)<br>
                if (libusb_handle_events(tc-&gt;ftdi-&gt;usb_ctx) &lt; 0)<br>
                    break;<br>
            libusb_free_transfer(tc-&gt;transfer);<br>
            free (tc);<br>
            return ret;<br>
        }<br>
    }<br>
<br>
<br>
But now this hangs in the inner while(!tc-&gt;completed) loop.<br>
<br>
On Tue, Jan 14, 2014 at 10:20 PM, Janne Heikkinen<br>
&lt;<a href="mailto:janne.m.heikkinen@gmail.com">janne.m.heikkinen@gmail.com</a>&gt; \
wrote:<br> &gt; Hi,<br>
&gt;<br>
&gt; I&#39;ve been using code like to to read from FT2232H is sync FIFO245 mode:<br>
&gt;<br>
&gt; struct ftdi_transfer_control *c = ftdi_read_data_submit(ftdi,<br>
&gt; lpBuffer, dwBytesToRead);<br>
&gt;<br>
&gt; int ret = ftdi_transfer_data_done(c);<br>
&gt;<br>
&gt; I was expecting ftdi_transfer_data_done() to timeout after the default \
timeout<br> &gt; which seems to be 5 seconds if there is no data to read but it seems \
to hang<br> &gt; instead?<br>
&gt;<br>
&gt; - Janne<br>
</blockquote></div>

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<br>=



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