Hi,
This is based on a script that I downloaded with Porus. I think it was
called porustest.py: http://prdownload.berlios.de/porus/porus-0.1.1.tgz
I recommend you to test it. It has a command interface that is useful for
debugging.
Self is the command interpreter object,
def getdevs():
"""Returns a flat array of configs on all busses -- ie an
array of tuples of (bus,dev,conf). Array is guaranteed to be
sorted by bus and dev. Used for giving numbers to configs"""
rtn=[]
for b in usb.busses():
for d in b.devices:
for c in d.configurations:
rtn.append((b,d,c))
return rtn
I don't know much about the serial part, but I would look into how
serial.Serial(port) is implemented. May be you need to change it a bit if
you want to open a device by PID and VID. I guess that it opens the device
and claims an interface, but I haven't used that library. I hope this helps.
Ah, I forgot
On Wed, Jun 17, 2009 at 9:27 AM, Brendan Simon (eTRIX) <
Bre...@et...> wrote:
> Thanks Santiago :)
> Unfortunately I'm new to usb so it's not making too much sense at the
> moment.
>
> What is the class object that self is referring to here ?
>
> Is getdevs() your own function or a standard os function ?
> Presumably getdevs calls something like usb.busses() somewhere ?
>
> I don't see how this gives me the name of the serial device (eg.
> /dev/cu.usbmodem0001) that I can then reference with pyserial Serial()
> function.
> example:
> port = '/dev/cu.usbmodem0001' # need to auto detect/determine this
> ser = serial.Serial( port )
>
> Thanks Brendan.
>
>
> Santiago Palomino Sanchez-Manjavacas wrote:
> > Well, you can use the device VID and PID to select which device to open.
> > I use something like:
> >
> > def do_d(self, args):
> > if self.devh is not None:
> > self.do_close('')
> > #ls
> > if self.devh is None:
> > self.devs=getdevs()
> > shortlist(self.devs)
> > dn = -1;
> > index = 0;
> > for d in self.devs:
> > if (d[1].idVendor == 0xFFFF and d[1].idProduct ==
> 0x0000):
> > dn = index;
> > index = index + 1;
> > if(dn == -1):
> > return 1
> > self.curdev=self.devs[dn]
> > self.devh=self.curdev[1].open()
> > self.devn=dn
> > self.devh.setConfiguration(self.curdev[2])
> >
> > self.devh.claimInterface(self.curdev[2].interfaces[0][0])
> > self.devh.setAltInterface(0)
> >
> >
> >
> > On Wed, Jun 17, 2009 at 7:14 AM, Brendan Simon (eTRIX)
> > <Bre...@et... <mailto:Bre...@et...>> wrote:
> >
> > I have a device with a usb connection that presents itself as a
> serial
> > device to operating system (OS X).
> > It appears as /dev/cu.usbmodem0001 and /dev/tty.usbmodem0001 on the
> > filesystem when the device is plugged in.
> >
> > I can successfully detect the device USB Vendor ID and Product ID
> using
> > pyusb :)
> >
> > Now I have to use pyserial to talk to the device -- which I have
> > successfully done by opening the serial port with a hard coded device
> > filename (/dev/cu.usbmodem0001).
> >
> > There must be some way for me to use the pyusb information to be able
> to
> > determine the appropriate device filename to open with pyusb.
> >
> > Does anyone know how to do this or have any suggestions ???
> >
> > Thanks, Brendan.
>
>
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