NAME
    Device::SMBus - Perl interface for smbus using libi2c-dev library.

VERSION
    version 1.06

SYNOPSIS
       use Device::SMBus;
       $dev = Device::SMBus->new(
         I2CBusDevicePath => '/dev/i2c-1',
         I2CDeviceAddress => 0x1e,
       );
       print $dev->readByteData(0x20);

DESCRIPTION
    This is a perl interface to smbus interface using libi2c-dev library.

    Prerequisites:

    For Debian and derivative distros(including raspbian) use the following
    to install dependencies:

      sudo apt-get install libi2c-dev i2c-tools build-essential

    If you are using Angstrom Linux use the following:

      opkg install i2c-tools
      opkg install i2c-tools-dev

    For ArchLINUX use the following steps:

      pacman -S base-devel
      pacman -S i2c-tools

    Special Instructions for enabling the I2C driver on a Raspberry Pi:

    You will need to comment out the driver from the blacklist. currently
    the I2C driver isn't being loaded.

         sudo vim /etc/modprobe.d/raspi-blacklist.conf

    Replace this line

         blacklist i2c-bcm2708

    with this

         #blacklist i2c-bcm2708

    You now need to edit the modules conf file.

         sudo vim /etc/modules

    Add these two lines;

         i2c-dev
         i2c-bcm2708

    Now run this command(replace 1 with 0 for older model Pi)

         sudo i2cdetect -y 1

    If that doesnt work on your system you may alternatively use this:

         sudo i2cdetect -r 1

    you should now see the addresses of the i2c devices connected to your
    i2c bus

ATTRIBUTES
  I2CBusDevicePath
    Device path of the I2C Device.

     * On Raspberry Pi Model A this would usually be /dev/i2c-0 if you are using the default pins.
     * On Raspberry Pi Model B this would usually be /dev/i2c-1 if you are using the default pins.

  I2CDeviceAddress
    This is the Address of the device on the I2C bus, this is usually
    available in the device Datasheet.

     * for /dev/i2c-0 look at output of `sudo i2cdetect -y 0' 
     * for /dev/i2c-1 look at output of `sudo i2cdetect -y 1'

METHODS
  fileError
    returns IO::Handle->error() for the device handle since the last
    clearerr

  writeQuick
     $self->writeQuick($value)

    This sends a single bit to the device, at the place of the Rd/Wr bit.

  readByte
     $self->readByte()

    This reads a single byte from a device, without specifying a device
    register. Some devices are so simple that this interface is enough; for
    others, it is a shorthand if you want to read the same register as in
    the previous SMBus command

  writeByte
     $self->writeByte()

    This operation is the reverse of readByte: it sends a single byte to a
    device.

  readByteData
     $self->readByteData($register_address)

    This reads a single byte from a device, from a designated register. The
    register is specified through the Comm byte.

  writeByteData
     $self->writeByteData($register_address,$value)

    This writes a single byte to a device, to a designated register. The
    register is specified through the Comm byte. This is the opposite of the
    Read Byte operation.

  readNBytes
     $self->readNBytes($lowest_byte_address, $number_of_bytes);

    Read together N bytes of Data in linear register order. i.e. to read
    from 0x28,0x29,0x2a

     $self->readNBytes(0x28,3);

  readWordData
     $self->readWordData($register_address)

    This operation is very like Read Byte; again, data is read from a
    device, from a designated register that is specified through the Comm
    byte. But this time, the data is a complete word (16 bits).

  writeWordData
     $self->writeWordData($register_address,$value)

    This is the opposite of the Read Word operation. 16 bits of data is
    written to a device, to the designated register that is specified
    through the Comm byte.

  processCall
     $self->processCall($register_address,$value)

    This command selects a device register (through the Comm byte), sends 16
    bits of data to it, and reads 16 bits of data in return.

  writeBlockData
     $self->writeBlockData($register_address, $values)

    Writes a maximum of 32 bytes in a single block to the i2c device. The
    supplied $values should be an array ref containing the bytes to be
    written.

    The register address should be one that is at the beginning of a
    contiguous block of registers of equal length to the array of values
    passed. Not adhering to this will almost certainly result in unexpected
    behaviour in the device.

  DEMOLISH
    Destructor

CONSTANTS
  I2C_SLAVE
USAGE
    *   This module provides a simplified object oriented interface to the
        libi2c-dev library for accessing electronic peripherals connected on
        the I2C bus. It uses Moose.

SEE ALSO
    *   Moose

    *   IO::File

    *   Fcntl

SUPPORT
  Bugs / Feature Requests
    Please report any bugs or feature requests through github at
    <https://github.com/shantanubhadoria/device-smbus/issues>. You will be
    notified automatically of any progress on your issue.

  Source Code
    This is open source software. The code repository is available for
    public review and contribution under the terms of the license.

    <https://github.com/shantanubhadoria/device-smbus>

      git clone git://github.com/shantanubhadoria/device-smbus.git

AUTHOR
    Shantanu Bhadoria <shantanu at cpan dott org>

CONTRIBUTORS
    *   Jonathan Stowe <jns+git@gellyfish.co.uk>

    *   Neil Bowers <neil@bowers.com>

    *   Shantanu Bhadoria <shantanu att cpan dott org>

COPYRIGHT AND LICENSE
    This software is copyright (c) 2013 by Shantanu Bhadoria.

    This is free software; you can redistribute it and/or modify it under
    the same terms as the Perl 5 programming language system itself.

