Check out the "latency timer" functionality.
I am not sure if your device has it.
The datasheet of the FT4232H, says the below:
"Latency Timer. This is really a feature of the driver and is used to as a timeout to flush short packets of data back to the PC. The default is 16ms, but it can be altered between 0ms and 256ms. At 0ms latency you get a packet transfer on every high speed microframe."
> Date: Wed, 20 Jan 2010 14:03:46 +0100
> Subject: Question about ftdi_read_data().
> From: teuniz@xxxxxxxxx
> To: libftdi@xxxxxxxxxxxxxxxxxxxxxxx
>
> I started to implement libftdi on Linux. Everything seems to work
> sofar except for one thing.
>
> It seems that the function ftdi_read_data() blocks till it has
> received the requested amount of bytes.
> I don't like this behaviour, I would like it to return immediately. Is
> it possible to change this behaviour?
>
> Is it possible to get the number of bytes in the receivebuffer so that
> I can use this number in the call
> to ftdi_read_data()?
>
> In my program, ftdi_read_data() is called from a timer so a
> non-blocking read-function is what I need.
> Using threads is not an option.
>
> Regards,
>
> Teunis
>
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