PHP code example of php-io-extensions / gpio

    
        
<?php
require_once('vendor/autoload.php');

/* Start to develop here. Best regards https://php-download.com/ */

    

php-io-extensions / gpio example snippets

use Fd\FD;

$fd = FD::open('/dev/gpiochip0', 2); // O_RDWR = 2
// ... use $fd with GPIOChip methods ...
FD::close($fd);

['name' => string, 'label' => string, 'lines' => int]

['name' => string, 'consumer' => string, 'offset' => int, 'num_attrs' => int, 'flags' => int]

[
    'info'         => ['name' => string, 'consumer' => string, 'offset' => int, 'num_attrs' => int, 'flags' => int],
    'timestamp_ns' => int,
    'event_type'   => int,  // 1 = REQUESTED, 2 = RELEASED, 3 = CONFIG_CHANGED
]

[
    'timestamp_ns' => int,
    'id'           => int,  // 1 = RISING_EDGE, 2 = FALLING_EDGE
    'offset'       => int,
    'seqno'        => int,
    'line_seqno'   => int,
]

use Fd\FD;
use Gpio\GPIOChip;
use Gpio\GPIOLine;

$fd = FD::open('/dev/gpiochip4', 2); // O_RDWR

$lineFd = GPIOChip::getLine($fd, 6, 0x08, 0, 'my-app'); // OUTPUT
if ($lineFd < 0) {
    throw new RuntimeException('Failed to request line');
}

GPIOLine::setValues($lineFd, 1); // HIGH — device on
sleep(1);
GPIOLine::setValues($lineFd, 0); // LOW  — device off

FD::close($lineFd);
FD::close($fd);

$fd = FD::open('/dev/gpiochip0', 2);

$lineFd = GPIOChip::getLine($fd, 27, 0x04, 0, 'my-app'); // INPUT

$state = GPIOLine::getValues($lineFd);
echo $state === 1 ? "HIGH\n" : "LOW\n";

FD::close($lineFd);
FD::close($fd);

// INPUT | EDGE_RISING | EDGE_FALLING
$fd = FD::open('/dev/gpiochip0', 2);

$lineFd = GPIOChip::getLine($fd, 27, 0x04 | 0x10 | 0x20, 64, 'my-app');

while (true) {
    $event = GPIOLine::readEdgeEvents($lineFd);
    if ($event !== []) {
        $edge = $event['id'] === 1 ? 'RISING' : 'FALLING';
        echo "{$edge} on offset {$event['offset']} at {$event['timestamp_ns']} ns\n";
    }
}

$fd = FD::open('/dev/gpiochip0', 2);

$chip = GPIOChip::chipInfo($fd);
echo "Chip: {$chip['name']} — {$chip['label']} ({$chip['lines']} lines)\n";

$line = GPIOChip::lineInfo($fd, 6);
echo "Line 6: consumer={$line['consumer']} flags={$line['flags']}\n";

FD::close($fd);