Uwe Bonnes wrote:
> Hello,
>
> with my FT2232H test setup, libftdi-1/libusb-1 with asyn mode enabled and
> following code snipplet (after setting up everything):
>
> struct ftdi_transfer_control *tc;
> int size = (1<<(CHUNKEXP));
> unsigned char buf[size];
> int actual_length;
> int res;
> if(do_async)
> {
> tc = ftdi_read_data_submit(&ftdic,
> buf,
> size);
> res = ftdi_transfer_data_done (tc);
> }
> else
> {
> res = ftdi_read_data(&ftdic, buf, size);
> }
> if (res>0)
> /*do something with the data */
>
> I don't see any consistant difference between both modes.
I don't think submitting an async request and immediately waiting for
it to finish will speed things up over ftdi_read_data. The benefit is
that you can do other things while it's receiving.
(Can you submit more read requests while you wait?)
-jim
--
libftdi - see http://www.intra2net.com/en/developer/libftdi for details.
To unsubscribe send a mail to libftdi+unsubscribe@xxxxxxxxxxxxxxxxxxxxxxx
|