## HiPi::Device::SerialPort

This module is a thin wrapper around the standard CPAN module Device::SerialPort.

It is implemeted to give a simple write only interface to the UART0_TXD output pin for devices such as LCD controllers that accept commands on their RX pins without needing a connection on their TX pins. ( TX output pin on Raspberry Pi goes to RX input pin on device ).

For more complex interaction over a serial TX/RX link it is recommended to use Device::SerialPort directly.

Note that by default on the Pi 3 the mini uart is broken out via pins 14 and 15 on the GPIO header as the main UART is used for Bluetooth. S the the contstructor method notes below

The following interface modules use HiPi::Device::SerialPort as a backend and may contain code that helps with your own usage.

HiPi::Interface::SerLCD
HiPi::Interface::HTBackpackV2 ( as an optional backend )

## Object Constructor and Methods

##### my $dev = HiPi::Device::SerialPort->new();

        Returns a new instance of the HiPi::Device::SerialPort class.

        You can optionally specify several parameters as key
        value pairs in the constructor. Their default values
        are:

        my $dev = HiPi::Device::SerialPort->new(
            devicename   => '/dev/ttyAMA0',
            baudrate     => 9600,
            parity       => 'none',
            stopbits     => 1,
            databits     => 8,
        );

        The devicename is passed the Device::SerialPort constructor
        while all other parameters are used to set the corresponding
        Device::SerialPort object properties.

        If you are using a Pi 3 with default settings, the header pins
        on the Rpi gpio are connected to the mini uart. You will therefore need
        to specify the device to override the default.

        my $dev = HiPi::Device::SerialPort->new(
            devicename   => '/dev/ttyS0',
        );

##### $dev->write( $buffer );

        Writes the $buffer to the open port using Device::SerialPort->write.
        Then calls Device::SerialPort->write_drain.

HiPi Modules Copyright © 2013 - 2016 Mark Dootson