Ubuntu Manpage: Owtcl - OWFS library access commands for Tcl

name
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low-level commands
example
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NAME

       Owtcl - OWFS library access commands for Tcl

SYNOPSIS

       package require ow

       ow option ?arg ...?

       ::OW::init interface ?interface ...? ?arg ...?
       ::OW::finish
       ::OW::isconnect
       ::OW::get ?path? ?arg ...?
       ::OW::put path ?value?
       ::OW::isdirectory path
       ::OW::isdir path
       ::OW::exists path

DESCRIPTION

1-Wire
1-wire is a wiring protocol and series of devices designed and manufactured by Dallas Semiconductor, Inc.
The bus is a low-power low-speed low-connector scheme where the data line can also provide power.

Each device is uniquely and unalterably numbered during manufacture. There are a wide variety of devices,
including memory, sensors (humidity, temperature, voltage, contact, current), switches, timers and data
loggers. More complex devices (like thermocouple sensors) can be built with these basic devices. There
are also 1-wire devices that have encryption included.

The 1-wire scheme uses a single bus master and multiple slaves on the same wire. The bus master initiates
all communication. The slaves can be individually discovered and addressed using their unique ID.

Bus masters come in a variety of configurations including serial, parallel, i2c, network or USB adapters.

OWFS design
OWFS is a suite of programs that designed to make the 1-wire bus and its devices easily accessible. The
underlying principle is to create a virtual filesystem, with the unique ID being the directory, and the
individual properties of the device are represented as simple files that can be read and written.

Details of the individual slave or master design are hidden behind a consistent interface. The goal is to
provide an easy set of tools for a software designer to create monitoring or control applications. There
are some performance enhancements in the implementation, including data caching, parallel access to bus
masters, and aggregation of device communication. Still the fundemental goal has been ease of use,
flexibility and correctness rather than speed.

owtcl
owtcl (3) is a Tcl extension that provides an interface to OWFS. The underlying interface to the 1-wire
bus is identical to owfs (1) (filesystem view) and owhttpd (1) web server interface. Only the top layer
has been modified to return native Tcl data.

COMMANDS

       Performs one of several operations, depending on option.  The legal options (which  may  be  abbreviated)
       are:

       ow open arg ...
              Connect to 1-wire adapter or owserver. arg ... defines a way of connection to the 1-wire bus.
              The full set of initialization args is extensive. They correspond roughly to the command line args
              of owfs (1) owhttpd (1) and owftpd (1)

       ow close
              Close connection to 1-wire bus or owserver.

       ow version ?-list?
              Return version of the owtcl and owlib/

       ow opened
              Return 1 if connected to 1-wire adapter or owserver, otherwise 0.

       ow error level value
              Set debug options. See owfs (5)

       ow error print value
              Set debug options. See owfs (5)

       ow get path ?-list?
              Returns contents of OWFS directory as the list if path contains name OWFS directory.  If  path  is
              name of OWFS file, returns of contents of this file. For files *.ALL returns a values list.

       ow put path value
              Puts value in OWFS file indicated in path. For files *.ALL use a value list.

       ow isdirectory path
              If path is the directory return 1. Otherwise return 0.

       ow isdir path
              Synonym of ow isdirectory

       ow set path
              Creates  a  new  ow-like  command  with  root in the path.  A new command allows options get, put,
              isdirectory, isdir and set.

LOW-LEVEL COMMANDS

       The following low-level commands are possible:

       ::OW::init interface ?interface ...? ?arg ...?
              Connect to 1-wire adapter or owserver. interface and arg ... defines a way of  connection  to  the
              1-wire bus.
              The  full  set of initialization options is extensive. They correspond roughly to the command line
              options of ,B owfs (1) owhttpd (1) and owftpd (1)

       ::OW::finish
              Close connection to 1-wire bus or owserver.

       ::OW::isconnect
              Return 1 if connected to 1-wire adapter or owserver, otherwise 0.

       ::OW::get ?path? ?-list?
              Returns contents of OWFS directory as the list if path contains name OWFS directory.  If  path  is
              name  of  OWFS  file,  returns of contents of this file. For files *.ALL returns a values list. If
              path is not defined, contents of root OWFS directory come back.

       ::OW::put path ?value?
              Puts value in OWFS file indicated in path. For files *.ALL use a value list. If  /fIvalue  is  not
              defined, puts a empty string.

       ::OW::isdirectory path
              If path is the directory - return 1. Otherwise return 0.

       ::OW::isdir path
              Synonym of ::OW::isdirectory

       ::OW::exists path
              If path is exists - return 1. Otherwise return 0.

EXAMPLE

              package require ow

              ow open -d /dev/ttyS0 -t 60

              set save_templow [ow get /28.86BF80000000/templow]
              ow put /28.86BF80000000/templow 10

              set room_sensor [ow set /28.86BF80000000]
              $room_sensor put temphigh 50

              set room_temp [$room_sensor set temperature]
              set current_temp [$room_temp get]

AVAILABILITY

       http://www.owfs.org

AUTHOR

       Serg Oskin (serg@oskin.ru)