60 lines
2.2 KiB
Python
Executable file
60 lines
2.2 KiB
Python
Executable file
#!/usr/bin/env python
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#
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# This program is a workaround for the inconsistent device naming
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# pattern implemented in the device driver for Silicon Labs CP2102 USB
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# to UART Bridge Controller. When there are multiple devices
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# installed on one computer, the second and subsequent devices are
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# given a numeric suffix that increments every time one of the devices
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# is plugged in. Thus, unplugging and reinserting a cable causes the
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# device name to change.
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#
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# The workaround is to use the device USB location identifier as a
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# consistent handle for the device, assuming that the cable is plugged
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# into the same jack each time.
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#
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# This program has two uses:
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#
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# 1) When invoked with no arguments it searches for all CP2102 devices
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# in the computer's USB hierarchy and prints a list of the bus
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# location identifier and device name for each. The device names will
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# be numbered in the order they were plugged in, so this list allows
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# associating a location identifier with each physical device.
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#
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# 2) When invoked with one argument that is the bus location of a
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# CP2102 device it prints the associated device name. This allows the
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# location identifier to be used as a constant identifier in a system
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# configuration file and then this program can be called in a script or
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# makefile to translate to the dynamic device name. If the argument
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# is not found as a location identifier, the argument will be output
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# unchanged; this allows the script or makefile to work with either a
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# location identifier or a device name as the configured handle.
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#
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# This program is derived from code provided without copyright by user
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# spachner21 in the Silicon Labs Interface Forum. It is provided here
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# as public domain.
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from __future__ import print_function
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import sys
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import serial.tools.list_ports
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ports = serial.tools.list_ports.grep("USB VID:PID=10c4:ea60")
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#Make new list from generated 'generator' objects returned by grep above
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pl = []
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for p in ports:
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pl.append(p)
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#Sort list by object attribute 'location'
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pl.sort(key=lambda x: x.location, reverse=False)
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if len(sys.argv) > 1:
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for p in pl:
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if str(p.location) == sys.argv[1]:
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print(p.device)
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break
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else:
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print(sys.argv[1])
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else:
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for p in pl:
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print(p.location + " " + p.device)
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