libftdi Archives

Subject: Re: How do I discover port names (/dev/cu.usb… or COM…) from devices

From: Ryan Tennill <rtennill@xxxxxxxxxxxxxxxx>
To: libftdi@xxxxxxxxxxxxxxxxxxxxxxx
Date: Thu, 8 Mar 2018 21:45:11 -0600
That's a shame! I was excited to have such an easy solution for a decidedly annoying problem... I can't help much on the Windows side of things unfortunately. Are the devices off-the-shelf products or are they something custom built for your application?

In the past I have used this udev rule to create symlinks that helped me map out the devices. If you use the PROGRAM={} you can run a script that produces the name of the device instead of using the symlink.

http://www.reactivated.net/writing_udev_rules.html#external-naming

# udev rule for AWARE MCCM G2 serial interfaces
#identify FTDI devices with VID/PID pair and create a convent symlink in /dev
SUBSYSTEM=="usb", ATTRS{idVendor}=="0403", GROUP="plugdev", SYMLINK+="%s{product}_%s{serial}"

On 3/8/2018 8:56 PM, Robert Poor wrote:
@Ryan:

I was trying to ditch the pyserial lib specifically because of problems on Windows, notably:


But since I have a workaround, I'll stick with that until someone tells me how to do it with libftdi...

- Robert


On Thu, Mar 8, 2018 at 5:59 PM, Ryan Tennill <rtennill@xxxxxxxxxxxxxxxx> wrote:


On 3/8/2018 7:48 PM, Robert Poor wrote:
[Disclaimer: I'm using the pylibftdi library as my sole access to the libftdi library, so pardon any translation errors...]

I'm running in an environment where there may be multiple FTDI devices plugged in.  And I'm running other code (a Modbus library) that needs to know the port names (i.e. /dev/cu.usbxxx on unix/osx or COMxx on Windows) for each FTDI device.

I'm using ftdi_usb_find_all() (via pylibftdi's Device.list_devices()) to get the list of serial numbers -- that works.  But I need to know the port names for each device.

Is there a call in libftdi that will produce the port name for a given serial number?

TIA.

- rdp

Pyserial can do this. http://pyserial.readthedocs.io/en/latest/tools.html

Not sure how well it works on osx/windows but I know it works on Linux.

Ryan

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