libftdi Archives

Subject: Re: FT2232H Synchroneous FIFO mode: Some findings

From: Jie Zhang <jzhang918@xxxxxxxxx>
To: libftdi@xxxxxxxxxxxxxxxxxxxxxxx
Date: Mon, 15 Feb 2010 19:17:57 +0800
On Wed, Feb 3, 2010 at 6:30 AM, Uwe Bonnes
<bon@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx> wrote:
> Okay,
> now running libftdi-1.0 linked against libusb-1.0.
> After fighting some other problems, the same thing happens. As soon as in
> following expression
> #define CHUNKEXP 14
>  if (ftdi_read_data_set_chunksize(&ftdic, 1<<(CHUNKEXP)))
> CHUNKEXP gets bigger then 14, blocks of data get skipped. Maybe something in
> libusb or even the kernel...
As I found, the read chunksize cannot be set larger than 16K. See


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