## HiPi::Interface::MCP3004

This module provides an interface to the MCP3004 analog to digital converter with SPI interface.

It uses HiPi::Device::SPI as a backend

## Object Constructor and Methods

##### my $adc = HiPi::Interface::MCP3004->new( %params );

        Returns a new instance of the HiPi::Interface::MCP3004 class.

        Optional key => values pairs in %params and their defaults:
        The parameters are all passed through to HiPi::Device::SPI

        devicename   => '/dev/spidev0.0',
        speed        => SPI_SPEED_MHZ_1,
        bitsperword  => 8,
        delay        => 0,

        You probably want to specify the devicename explicitly depending
        on which cable select pin you have connected the MCP3004

        For SPI0_CEO_N
        my $adc = HiPi::Interface::MCP3004->new(
            devicename   => '/dev/spidev0.0',
        );

        For SPI0_CE1_N
        my $adc = HiPi::Interface::MCP3004->new(
            devicename   => '/dev/spidev0.1',
        );

        See  Raspberry Pi GPIO Pin layout for pin locations.

##### my $value = $adc->read( $mode );

        $mode is the seven bit mask described as the configure bits
        in the MCP3004 datasheet that determines the channel and
        read mode for the returned value.

        For convenience the module exports the following constants that
        you can pass as a value for $mode

        MCP3004_S0         # single-ended CH0
        MCP3004_S1         # single-ended CH1
        MCP3004_S2         # single-ended CH2
        MCP3004_S3         # single-ended CH3
        MCP3004_DIFF_0_1   # differential +CH0 -CH1
        MCP3004_DIFF_1_0   # differential -CH0 +CH1
        MCP3004_DIFF_2_3   # differential +CH2 -CH3
        MCP3004_DIFF_3_2   # differential -CH2 +CH3

        You can import these constants into your namespace with

        use HiPi::Interface::MCP3004 qw( :mcp );

HiPi Modules Copyright © 2013 - 2016 Mark Dootson