Unable to make multiple simultaneous connections to separate interfaces
Opened this issue · 3 comments
GoogleCodeExporter commented
What steps will reproduce the problem?
1. Plug in an FTDI device with multiple interfaces (e.g. FT2232H w/IFACE_A,
IFACE_B)
2. Connect to the first one (successfully), using e.g. SPI:
mpsseA = OpenIndex(0x0403, 0x6014, SPI0, ONE_MHZ, MSB, IFACE_A, NULL, NULL, 0);
3. Connect to the second one (won't work), using e.g. SPI:
mpsseB = OpenIndex(0x0403, 0x6014, SPI0, ONE_MHZ, MSB, IFACE_B, NULL, NULL, 0);
4. Notice 2nd connection did not work:
(mpsseB == NULL)
What is the expected output? What do you see instead?
Ideally both connections would be valid, up-and-running and I could talk to 2
separate SPI circuits independently (and/or simultaneously). Instead the second
connection failed
What version of the product are you using? On what operating system?
Latest SVN as of today (r201), same as libftdi. Using OS X 10.8.4.
Please provide any additional information below.
Asking for IFACE_B first, and then IFACE_A, confirms that the interface
parameter works, but once I have made the first USB connection (e.g. to
IFACE_B), I cannot make a 2nd connection to the other interface (IFACE_A in
this case)
Original issue reported on code.google.com by p...@p-rimes.net
on 9 Jul 2013 at 9:20
GoogleCodeExporter commented
Interesting...OpenIndex should never return a NULL pointer unless it failed to
allocate memory for the mpsse structure via malloc. I'll see if I can reproduce.
Original comment by heffne...@gmail.com
on 16 Sep 2013 at 6:15
GoogleCodeExporter commented
Just a note: I use separate interfaces all the time and it seems to work okay,
even on the latest stuff. Actually, I open up 3 usually. After my board is
configured, using the 3 interfaces, I usually only use one from then on, but
suspect I could use others.
Original comment by robokni...@gmail.com
on 29 Nov 2013 at 4:14
GoogleCodeExporter commented
Second note: I don't use OpenIndex though.
Original comment by robokni...@gmail.com
on 29 Nov 2013 at 4:15