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. Reading tops out
at 22 MByte/sec if no further processing is done. Writing out the data gets
me down to 18 MByte/sec
Probably I use the async mode in some wrong way. Any usage hints welcome!
Meanwhile I found fastftdi.c from the dsi/ram-tracer project. Throughing out
everything project related I can reach 28 MB/sec, even writing the data. Is
the license
(http://svn.navi.cx/misc/trunk/nds/dsi/ram-tracer/host/fastftdi.c) open
enough that I can offer an adapted version for libftdi? Is there interest?
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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