LwcRaspi

Raspberry Pi PHP library

GPIO

For now, there is only the sysfs adapter, which uses linux sysfs exposed files/directories to interact with the GPIO interface.

<?php
use Lwc\Raspi\Gpio;

$gpioAdapter = new Gpio\Adapter\SysfsAdapter();
$pin = new Gpio\Pin(Gpio\Pin::PIN_CS, Gpio\Pin::DIRECTION_OUTPUT, $gpioAdapter));
$pin->set();
// ...and clear
$pin->clear();

SPI

To communicate with a periphal via SPI like an LCD controller, i've created a driveless solution for now using bitbanging. As i already noticed, the combination of sysfs + bitbanging is way too slow for descent drawing performance on a display (and i have just a 128x64 one).

<?php
use Lwc\Raspi\Gpio;
use Lwc\Raspi\Spi;

$gpioAdapter = new Gpio\Adapter\SysfsAdapter();
$mosi = new Gpio\Pin(Gpio\Pin::PIN_MOSI, Pin::DIRECTION_OUTPUT, $gpioAdapter);
$sclk = new Gpio\Pin(Gpio\Pin::PIN_SCLK, Pin::DIRECTION_OUTPUT, $gpioAdapter);
$cs = new Gpio\Pin(Gpio\Pin::PIN_CS, Pin::DIRECTION_OUTPUT, $gpioAdapter);
$rs = new Gpio\Pin(Gpio\Pin::PIN_RS, Pin::DIRECTION_OUTPUT, $gpioAdapter);

$spiAdapter = new Spi\Adapter\GpioBitbangingAdapter($mosi, $sclk, $cs, $rs);

$spiAdapter->writeCommand(...);
$spiAdapter->writeData(...);

========

Future

• Classes to interact with the RaspiLCD
• Other GPIO adapters
• Other SPI adapters (utilizing the Broadcom BCM 2835 via driver)