noccylabs/raspio

Raspberry Pi GPIO/Peripheral Library

0.1.1 2014-01-20 23:14 UTC

README

Installing

Install using composer:

composer require "noccylabs/raspio:dev-master"

Or by cloning the github repository:

git clone git@github.com:noccylabs/php-raspio

Note that composer will take care of the autoloading; if you clone the repository you have to take care of that yourself.

Getting Started

On a Raspberry Pi, just call on RaspberryPi::getInstance() to get an instance of the board driver.

use RaspIo\RaspberryPi;

// Get an instance of the Pi
$pi = RaspberryPi::getInstance();

getInstance() will find the first registered board driver that doesn't throw an exception, make sure it's an instance of RaspIo\RaspberryPi, and then use that for subsequent calls to getInstance().

Devices are registered in the board driver constructor or in device drivers with a call to the registerDevice($id,$device) method. This makes them available via their respective properties as well as the getDevice() method.

// Like this
$gpio = $pi->gpio;
// Or this
$gpio = $pi->getDevice("gpio");

Devices can also be aliased, by calling registerAlias($alias,$id). This is used to define the default devices when more than one of the device type may be available on the board.

You can get the info on the board detected by calling getVersion():

printf("Board: %s\n", $pi->getVersion());

Devices can also be iterated over, or accessed via getRegisteredDevices() (and getRegisteredAliases()).

printf("Devices:\n");
foreach($pi as $device=>$obj) {
    printf("  %s => %s\n", $device, get_class($obj));
}

printf("Aliases:\n");
foreach($pi->getRegisteredAliases() as $alias=>$device) {
    printf("  %s -> %s\n", $alias, $device);
}

...on any other platform

If you will be using or testing cose using RaspIo on a platform that is not supported, you can enable emulation.

use RaspIo\RaspberryPi;

// Add the emulated rev2 board. This must be done before the first
// call to RaspberryPi::getInstance()
RaspberryPi::addBoardDriver("RaspIo\\Board\\EmulatedRev2Board");
// Get an instance of the Pi
$pi = RaspberryPi::getInstance();

Using the devices

GPIO

The GPIO is available with the device id gpio, and it should be a class implementing the interface RaspIo\Device\Gpio\IGpioMapper. It is normally an instance of RaspIo\Device\Gpio\GpioMapper.

// Get Pi instance
$pi = RaspberryPi::getInstance();

// Export and set direction
$pin = $pi->gpio->export(0)->setDirection("out");
   
// Write to the pin
$pin->setValue(1);

Available methods are defined in RaspIo\Device\Gpio\IGpioExport:

  • setDirection($dir) and getDirection() to set the gpio direction to one of in or out.
  • setValue($val) and getValue() to set the gpio value to either 1 or 0.

To unexport a pin, call on unexport() on the GpioMapper:

// Unexport the pin
$pi->gpio->unexport(0);

UART

UART support is not yet implemented.

Dummy Devices

Dummy devices are placeholders for not yet implemented devices.