Re: [Pyusb-users] Mapping usb serial devices to device filenames

[Santiago P. Sanchez-M. <sp...@gm...>]

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...> 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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