PHP code example of microscrap / gpio

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

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

    

microscrap / gpio example snippets

use Microscrap\Bindings\GPIO\Enums\LineDirection;
use Microscrap\Bindings\GPIO\Enums\LineEdge;
use Microscrap\Bindings\GPIO\Enums\LineValue;

$chip = gpiod_chip_open('/dev/gpiochip0');

$led_settings = gpiod_line_settings_new();
gpiod_line_settings_set_direction($led_settings, LineDirection::OUTPUT);
gpiod_line_settings_set_output_value($led_settings, LineValue::INACTIVE);

$btn_settings = gpiod_line_settings_new();
gpiod_line_settings_set_direction($btn_settings, LineDirection::INPUT);
gpiod_line_settings_set_edge_detection($btn_settings, LineEdge::RISING);

$line_config = gpiod_line_config_new();
gpiod_line_config_add_line_settings($line_config, [17], $led_settings);
gpiod_line_config_add_line_settings($line_config, [27], $btn_settings);

$req_config = gpiod_request_config_new();
gpiod_request_config_set_consumer($req_config, 'blink-example');

$request = gpiod_chip_request_lines($chip, $req_config, $line_config);

// Blink 5 times
for ($i = 0; $i < 5; $i++) {
    gpiod_line_request_set_value($request, 17, LineValue::ACTIVE);
    usleep(500_000);
    gpiod_line_request_set_value($request, 17, LineValue::INACTIVE);
    usleep(500_000);
}

gpiod_line_request_release($request);
gpiod_chip_close($chip);

$chip = gpiod_chip_open('/dev/gpiochip0');
if ($chip === null) {
    throw new RuntimeException('Failed to open GPIO chip');
}

$info = gpiod_chip_get_info($chip);
echo $info->name . ' — ' . $info->num_lines . " lines\n";

$line = gpiod_chip_get_line_info($chip, 17);
echo $line->name . ' used=' . ($line->used ? 'yes' : 'no') . "\n";

$ready = gpiod_chip_wait_info_event($chip, 1_000_000_000); // 1 s
if ($ready === 1) {
    $event = gpiod_chip_read_info_event($chip);
}

$offset = gpiod_chip_get_line_offset_from_name($chip, 'GPIO17');

$request = gpiod_chip_request_lines($chip, $req_config, $line_config);
if ($request === null) {
    throw new RuntimeException('Failed to request lines');
}

$line_config = gpiod_line_config_new();
gpiod_line_config_add_line_settings($line_config, [4, 17, 27], $settings);

$v = gpiod_line_request_get_value($request, 27);
echo $v === LineValue::ACTIVE ? "HIGH\n" : "LOW\n";

gpiod_line_request_set_value($request, 17, LineValue::ACTIVE);

$buffer = gpiod_edge_event_buffer_new(16);

$ready = gpiod_line_request_wait_edge_events($request, -1); // block
if ($ready === 1) {
    $n = gpiod_line_request_read_edge_events($request, $buffer, 16);
    for ($i = 0; $i < $n; $i++) {
        $event = gpiod_edge_event_buffer_get_event($buffer, $i);
        printf("offset=%d type=%s ts=%d ns\n",
            $event->line_offset,
            $event->event_type->name,
            $event->timestamp_ns,
        );
    }
}