NAME

owperl - perl interface for the 1-wire filesystem

SYNOPSIS

OW.pm
use OW ;
OW::init( interface );
OW::init( initialization string );

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::get( path );
OW::put( path , value );
OW::finish();

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 fundamental goal has been ease of use, flexibility and correctness rather than speed.

owperl

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

owperl (3) is created by swig (1) (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('´);"

AVAILABILITY

http://www.owfs.org

AUTHOR

Paul Alfille (paul.alfille@gmail.com)

NAME

SYNOPSIS

DESCRIPTION

1-Wire

OWFS design

owperl

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