NAME

  Device::WebIO::Device::SPI - Role for things that can do SPI

REQUIRED METHODS

spi_channels

Returns the number of spi channels.

spi_set_speed

  spi_set_speed( $channel, $speed );

Set the clock speed of the channel.

spi_read

  spi_read( $channel, $len );

Read $len bytes from the channel. Returns an arrayref of data.

spi_write

  spi_write( $channel, $packed_data );

Write $packed_data to the channel. This should be a packed string. For many devices, a single byte can packed using:

  my $packed_data = pack 'n', $data;

For an array of bytes, try:

  my $packed_data = pack 'C*', @data;

This can often be different based on the device, which is why we don't do it for you.

LICENSE

Copyright (c) 2014 Timm Murray All rights reserved.

Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met:

    * Redistributions of source code must retain the above copyright notice, this list of 
      conditions and the following disclaimer.
    * Redistributions in binary form must reproduce the above copyright notice, this list of
      conditions and the following disclaimer in the documentation and/or other materials 
      provided with the distribution.

THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.