Remco Poelstra wrote:
Michael Schnell schreef:
assume that you have 2 platforms with usb support. In fact, one
device and a PC.
On the first platform, you have a USB device attached (e.g. a
memory stick).
You connect the platform with the PC through their usb ports.
Is there any way you can control the memory stick through the PC?
(The first platform will act something like a USB relay?).
Its not mandatory that the platform can access the USB device at the
same time. I can even have 2 different firmwares, one for normal
use(ttyUSBx) and another as a Linux Hub. How can I make mt platform
behave like a usb hub? (I have no experience in USB, any hints are
welcomed).
To me this seems like a very dangerous thing. The PC software will
assume that the data on the memory stick is unchanged unless it is
plugged out and re-discovered. So if your device works as a hub and
under the covers accesses the memory stick, the PC will easily fail
or corrupt the data on the stick.
Seems that Dimitris only wants one of the two options: Either a very
expensive memory stick or a device running linux with some added flash
memory. In that case the problem you mentioned doesn't exist,
otherwise I also doubt that it's going to work.
Of course the "expensive memory stick" option can also be implemented
with Linux running on the uC, but it indeed shouldn't access the
memory stick on it's own then.
In case of "external" operation, the platform itself(uC) is not supposed
to access-use the usb device. (In fact, the usb device is a 3G card)
How is the device connected to the PC? What is between the USB
connector and the microcontroller? If it's such a nice FTDI serial
converter, than it's not going to work anyway (without a lot of work).
I was thinking of having the PC connected directly to the
platform(second usb interface). (The first usb interface is for the usb
device itself).
I found a "usb-server" on the net
(http://usb-server.com/usb-redirector-usb-server.html), where you can
access the usb device from network (run the usb-server on the platform
and usb-client on the PC). The bad thing is that some deamons are
pre-built (no-source). My platform is currently x86. Is there any way I
can "recompile" the (dynamically linked)binaries (glibc pre-built) as
static (in order to use them in my fs)?
Thanks,
Dimitris
Kind regards,
Remco Poelstra
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