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Man Pages


Manual Reference Pages  -  OWPERL (3)

NAME

<B>owperlB> - perl interface for the 1-wire filesystem

CONTENTS

Synopsis
     OWFS design
Functions
     OW::init( interface )
Example
See Also
     Programs
     Configuration and testing
     Language bindings
     Clocks
     Id
     Memory
     Switches
     Temperature
     Humidity
     Voltage
     Resistance
     Multifunction (current, voltage, temperature)
     Counter
     LCD Screen
     Crypto
     Pressure
     Moisture
Availability
Author

SYNOPSIS

<B>OW.pmB>
<B>use OW ;B>
<B>OW::init(B> interface <B>);B>
<B>OW::init(B> initialization string <B>);B>

The full set of initialization options is extensive. They correspond roughly to the command line options of ,B owfs (1) <B>owhttpd (1)B> and <B>owftpd (1)B>
<B>OW::get(B> path <B>);B>
<B>OW::put(B> path <B>,B> value <B>);B>
<B>OW::finish();B>

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 priciple 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.

    owperl

<B>owperl (3)B> is a perl module that provides an interface to OWFS. The path to each 1-wire device is the same as <B>owfs (1)B> . Only the top layer has been modified to return native perl strings.

<B>owperl (3)B> is created by <B>swig (1)B> (http://www.swig.org) which can be easily modified to support other programming languages.

FUNCTIONS

    OW::init( interface )

interface
Location of the 1-wire bus:
"u" Direct connection to the 1-wire interface on the USB port -- DS9490
/dev/ttySx
  Direct connection to a 1-wire interface on the serial port -- DS9097U or DS9097
port | :port | IPaddress:port
  Location of an owserver daemon that connects to the 1-wire bus. Multiple owperl as well as owfs and owhttpd programs can access the owserver process simultaneously. In fact, this will probably be the preferred mode of access to OWFS for owperl except in trivial applications.

EXAMPLE

perl -MOW -e "OW::init(’/dev/ttyS1’); printf OW::get(’');"

SEE ALSO

    Programs

<B>owfs (1) owhttpd (1) owftpd (1) owserver (1)B> <B>owdir (1) owread (1) owwrite (1) owpresent (1)B> <B>owtap (1)B>

    Configuration and testing

<B>owfs (5) owtap (1) owmon (1)B>

    Language bindings

<B>owtcl (3) owperl (3) owcapi (3)B>

    Clocks

<B>DS1427 (3) DS1904(3) DS1994 (3) DS2404 (3) DS2404S (3) DS2415 (3) DS2417 (3)B>

    ID

<B>DS2401 (3) DS2411 (3) DS1990A (3)B>

    Memory

<B>DS1982 (3) DS1985 (3) DS1986 (3) DS1991 (3) DS1992 (3) DS1993 (3) DS1995 (3) DS1996 (3) DS2430A (3) DS2431 (3) DS2433 (3) DS2502 (3) DS2506 (3) DS28E04 (3) DS28EC20 (3)B>

    Switches

<B>DS2405 (3) DS2406 (3) DS2408 (3) DS2409 (3) DS2413 (3) DS28EA00 (3)B>

    Temperature

<B>DS1822 (3) DS1825 (3) DS1820 (3) DS18B20 (3) DS18S20 (3) DS1920 (3) DS1921 (3) DS1821 (3) DS28EA00 (3) DS28E04 (3) EDS0064 (3) EDS0065 (3) EDS0066 (3) EDS0067 (3) EDS0068 (3) EDS0071 (3) EDS0072 (3) MAX31826 (3)B>

    Humidity

<B>DS1922 (3) DS2438 (3) EDS0065 (3) EDS0068 (3)B>

    Voltage

<B>DS2450 (3)B>

    Resistance

<B>DS2890 (3)B>

    Multifunction (current, voltage, temperature)

<B>DS2436 (3) DS2437 (3) DS2438 (3) DS2751 (3) DS2755 (3) DS2756 (3) DS2760 (3) DS2770 (3) DS2780 (3) DS2781 (3) DS2788 (3) DS2784 (3)B>

    Counter

<B>DS2423 (3)B>

    LCD Screen

<B>LCD (3) DS2408 (3)B>

    Crypto

<B>DS1977 (3)B>

    Pressure

<B>DS2406 (3) TAI8570 EDS0066 (3) EDS0068 (3)B>

    Moisture

<B>EEEF (3) DS2438 (3)B>

AVAILABILITY

http://www.owfs.org

AUTHOR

Paul Alfille (paul.alfille@gmail.com)
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OWFS Manpage OWPERL (3) 2004

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