$retval = 0;
$device = $argv[1];
$baudRate = 9600;
$prompt = 'brightness>';
$port = new SerialPort();
try {
$port->open($device);
$port->setBaudRate($baudRate);
$port->setFlowControl(SerialPort::FLOW_CONTROL_NONE);
$port->setCanonical(false);
$port->setVTime(0)->setVMin(0);
$stdin = fopen('php://stdin', 'r');
print $prompt;
while (FALSE !== ($line = fgets($stdin))) {
if (preg_match('/^(?:quit|exit)/', $line)) {
break;
}
$brightness = pack('C', (int) $line);
$port->write($brightness);
print $prompt;
}
fclose($stdin);
} catch (Exception $e) {
print 'exception occurred' . PHP_EOL;
print $e->getMessage() . PHP_EOL;
$retval = 2;
}
if ($port->isOpen()) {
$port->close();
}
exit($retval);
