USB

**Linux USB serial port assignment**

There is a much better solution than the one below if you have linux, udev, and usb to serial converters with serial numbers, or not more than one of each kind, see this solution with udev.

Newer versions of Linux will assign USB serial ports on the fly. In Misterhouse one always wants to know which device is attached to which /dev/ttyUSBx port. The probeport.py Python program listed below solves this problem by always assigning the correct device and port.

Probeport.py will scan selected ports and look for a signature from the device, it will then create a link from that port to a static device name in the /dev directory.

This is for use with Misterhouse but could be adapted to anything. Please send additional device information to: farrisg@shaw.ca

code format="python"

1. ! /usr/bin/python

"""

 probeport.py
 Copyright (c) 2010 George Farris <farrisg@shaw.ca>

 This program is free software; you can redistribute it and/or modify
 it under the terms of the GNU General Public License as published by
 the Free Software Foundation; either version 3 of the License, or
 (at your option) any later version.

 This program is distributed in the hope that it will be useful,
 but WITHOUT ANY WARRANTY; without even the implied warranty of
 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 GNU General Public License for more details.

 You should have received a copy of the GNU General Public License
 along with this program; if not, write to the Free Software
 Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.

Version history

  0.1  Jan 20, 2010 First release

This is for use with Misterhouse but could be adapted to anything.

probeport.py will probe all the ports in the SERIAL_PORTS list for any of the devices in the PROBE_DEVICES list. Once a port is found it will be deleted from the SERIAL_PORTS so it won't continually be probed.

In Misterhouse you should set the port devices accordingly, here is a sample of my mh.private.ini file:

Insteon_PLM_serial_port=/dev/mh_plm_port W800_module = X10_W800 W800_port = /dev/mh_w800_port weeder_port = /dev/mh_weeder_port weeder_baudrate=9600

This script should be run at boot time or any time before Misterhouse starts

If you have more or less than 4 ports you can add or subtract them to the SERIAL_PORTS list. Also, here is an example if you only have two devices such as a weeder board and a plm.

PROBE_DEVICES = ['probe_plm',] SERIAL_PORTS = ['/dev/ttyUSB0',]

Please feel free to forward other devices we can probe and I'll add them to the list and release a new version. Also please feel free to forward changes or bug fixes. Thanks. George farrisg@shaw.ca """

import sys, os, serial, string, binascii, time, tempfile

1. -------------- User modifiable settings -----------------------------
2. PROBE_DEVICES = ['test']

PROBE_DEVICES = ['probe_plm',] SERIAL_PORTS = ['/dev/ttyUSB0',] INSTEON_PLM_BAUD_RATE = 19200 WEEDER_IO_BAUD_RATE = 9600 WEEDER_BOARD_ADDRESS = "A" W800RF32_BAUD_RATE = 4800

1. ------------- End of user modifiable settings -----------------------

def test():

    print "This is a test run...."

1. -----------------------------------------------------------------------------
2. Probe for the insteon serial PLM
3. plm send 0x02 0x73, receive 0x02 0x73 0xXX 0x00 0x00 0x06/0x15
4. -----------------------------------------------------------------------------

def probe_plm():

    for myport in SERIAL_PORTS:
        print "Probing for Insteon PLM port -> " + myport

        try:
            id = SERIAL_PORTS.index(myport)
            ser = serial.Serial(myport, INSTEON_PLM_BAUD_RATE, timeout=2)
            # Probe for Insteon response to command

            ser.write(binascii.a2b_hex("0273"))
            s2 = binascii.b2a_hex(ser.read(8))
            print s2
            if s2[0:4] == "0273":
                print "linking " + myport + " to /dev/mh_plm_port"
                command = "/bin/ln -sf " + myport + " /dev/mh_plm_port"
                os.system(command)
                del SERIAL_PORTS[id]
                ser.close()
                break
            ser.close()

        except:
            print "Error - Could not open serial port..."

1. -----------------------------------------------------------------------------
2. Probe for the Weeder WTDIO-M 14 channel digital IO board
3. weeder send A, receive A?
4. -----------------------------------------------------------------------------

def probe_wtdio():

    for myport in SERIAL_PORTS:
        print "Probing for Weeder WTDIO-M IO board port -> " + myport

        try:
            id = SERIAL_PORTS.index(myport)
            ser = serial.Serial(myport, WEEDER_IO_BAUD_RATE, timeout=2)
            # Probe for Insteon response to command
            ser.write(WEEDER_BOARD_ADDRESS)
            s2 = ser.read(5)
            print s2
            if s2[0:2] == WEEDER_BOARD_ADDRESS + '?':
                print "linking " + myport + " to /dev/mh_weeder_port"
                command = "/bin/ln -sf " + myport + " /dev/mh_weeder_port"
                os.system(command)
                del SERIAL_PORTS[id]
                ser.close()
                break
            ser.close()

        except:
            print "Error - Could not open serial port..."

1. -----------------------------------------------------------------------------
2. Probe for the W800RF32 x10 RF receiver
3. w800 send 0xf0 0x29, receive 0x29
4. -----------------------------------------------------------------------------

def probe_w800():

    for myport in SERIAL_PORTS:
        print "Probing for W800RF32 port -> " + myport

        try:
            id = SERIAL_PORTS.index(myport)
            ser = serial.Serial(myport, W800RF32_BAUD_RATE, timeout=2)
            # Probe for Insteon response to command

            ser.write(binascii.a2b_hex("F029"))
            s2 = binascii.b2a_hex(ser.read(8))
            print s2
            if s2[0:2] == "29":
                print "linking " + myport + " to /dev/mh_w800_port"
                command = "/bin/ln -sf " + myport + " /dev/mh_w800_port"
                os.system(command)
                del SERIAL_PORTS[id]
                ser.close()
                break
            ser.close()

        except:
            print "Error - Could not open serial port..."

if == "":

    for device in PROBE_DEVICES:
        func = globals()[device]
        func()

    print "Goodbye..."

code