Hello,
On 2014-03-12 18:28, Steve Soloski wrote:
Are there any examples of how to use libFTDI with multiple interfaces
on the same USB device?
just do it (se below)!
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().
this should JustWork(tm)
Here's what I've tried so far:
[snip]
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.
You _must_ call ftdi_open() to initialise the internal structures of
libftdi ... and don't worry, this will _not_ reset the (entire) FTDI
chip.
Been there, done that, got the T-shirt:
My application uses libftdi (in bitbang mode) to set an output low on
port A (write enable on an SPI flash chip) then using libmpsse on port
B programs the flash.
It's an FT2234H, but the FT2232H should behave similarly.
Cheers
Anders
--
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