Hi Will,
If I read the datasheet correct, single channel means that the
synchronous FIFO mode is only available in interface A and not in B.
So you mean if I choose this mode in interface A, interface B must be
unconfigured?
Regards
Mikael
Will Zhang skrev 2010-10-13 11:06:
Hi Mikael,
To my knowledge, FT2232H supports SINGLE CHANNEL synchronous FIFO
mode. I suggest double check the data sheet to make sure your desired
configuration is possible in hardware.
Will
On Wed, Oct 13, 2010 at 7:13 PM, Mikael Krus <m...@omnisys.se
<mailto:m...@omnisys.se>> wrote:
Hi,
I am trying to configure both interfaces in FT2232H, and use them
and at the same time. This isn't working as expected though.
This is how I like it:
Interface A should be in synchrounous FIFO mode continously
reading the buffer waiting for data.
Interface B should be in MPSSE mode (simple general purpose IO).
Toggling a pin writes data to the FIFO (for interface A to read).
This is a snippet from my code when sertting up the interfaces (I
can attach my full code if someone like to see it):
// Select and open interface A, reset and purge, enable syncFIFO
ret = ftdi_set_interface(&ftdicA, INTERFACE_A);
ret |= ftdi_usb_open_dev(&ftdicA, devlist->dev);
ret |= ftdi_usb_reset(&ftdicA);
ret |= ftdi_usb_purge_buffers(&ftdicA);
ret |= ftdi_set_bitmode(&ftdicA, 0, BITMODE_RESET);
ret |= ftdi_set_bitmode(&ftdicA, 0, BITMODE_SYNCFF);
ret = ftdi_set_interface(&ftdicB, INTERFACE_B);
ret |= ftdi_usb_open_dev(&ftdicB, devlist->dev);
ret |= ftdi_usb_reset(&ftdicB);
ret |= ftdi_usb_purge_buffers(&ftdicB);
ret |= ftdi_set_bitmode(&ftdicB, 0, BITMODE_RESET);
ret |= ftdi_set_bitmode(&ftdicB, 0, BITMODE_MPSSE);
After this I try to send a "bogus" command to the MPSSE expecting
it to send back a two byte "error code" message, but this never
happens.
If I comment out the setup of interface A, however it works as
expected (regarding the "error message" sent back).
What did I do wrong??
Besides this, what effect will my ftdi_usb_reset() call have on
interface A when calling it for interface B? Does it also get reset?
Best regards
Mikael
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Mikael Krus, M.Sc.EE
Omnisys Instruments AB
August Barks Gata 6B
SE-421 32 Västra Frölunda
Sweden
Phone: +46 31 734 34 10
http://www.omnisys.se
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