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)
> <brendan.si...@etrix.com.au <mailto:brendan.si...@etrix.com.au>> 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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