That's strange. Then how is the ioctl(fd, FIONREAD, &bytes);
implemented in the kernel driver? That seems to be working fine, and
it reads the number of bytes available...
Regards,
Ákos Vandra
On 14 November 2011 11:00, Uwe Bonnes
<bon@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx> wrote:
>>>>>> "Akos" == Akos Vandra <axos88@xxxxxxxxx> writes:
>
> Akos> Hi! I am tryingo to use an FT2232 chip in UART mode. I would like
> Akos> to write a function that reads the queued buffer from the chip, if
> Akos> there are bytes available, and return with no data if there are no
> Akos> bytes to be read. (Non-blocking). To do this I guess I would need
> Akos> some mechanism to test how many bytes are available. Is there such
> Akos> a funciton in libftdi?
>
> The Chip itself has no such function.
>
> To do what you want, you have to run like libftd2xx:
> - Start one thread to continously read the device with a given timeout and
> write to a buffer
> - Now your main program can read non-blocking from the buffer in the other
> thread.
>
> Bye
> --
> Uwe Bonnes bon@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
>
> Institut fuer Kernphysik Schlossgartenstrasse 9 64289 Darmstadt
> --------- Tel. 06151 162516 -------- Fax. 06151 164321 ----------
>
> --
> libftdi - see http://www.intra2net.com/en/developer/libftdi for details.
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>
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