Hello,
Are there any examples of how to use libFTDI with multiple interfaces on
the same USB device?
Some background:
Our device (an FT2232H) supports two interfaces; INTERFACE_B is being
used in MPSSE mode to control I2C and GPIO functions; INTERFACE_A is
being used to stream images to the host. We use libMPSSE to open
INTERFACE_B, and I'm hoping I can re-use the existing open USB device to
talk via libFTDI to INTERFACE_A - specifically using ftdi_readstream().
Here's what I've tried so far:
struct mpsse_context *mpsse = <already open mpsse context on intf b>
// create a new ftdi context
struct ftdi_context *ftdi = ftdi_new();
// set the interface to A
ftdi_set_interface(ftdi, FTDI_INTERFACE_A);
// tell ftdi to use an already open device
ftdi_set_usbdev(ftdi, can->mpsse->ftdi.usb_dev);
<do other ftdi stuff here?>
ftdi_readstream(...);
But this just results in an error message "Device doesn't support
synchronous FIFO mode". This is understandable, since ftdi->type doesn't
get set unless ftdi_open is called. But I don't think I need to call
that since it will re-initialize the usb device... I think.
Bottom line - is this approach reasonable? I'm sure I'm missing
something - both in code and in concept - so any information or examples
would be great!
Steve Soloski
--
libftdi - see http://www.intra2net.com/en/developer/libftdi for details.
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