function dmx_connect()
{
global $debug, $dmx, $read_buffer;
$r = trim(`ls -1 /dev/serial/by-id 2>/dev/null |grep "DMX"`);
if ($r == '') {
logformat("No USB DMX Interface appears to be connected!\n");
exit(1);
}
$t = explode("-", $r);
if (isset($t[1])) {
logformat(sprintf("Found a %s\n", $t[1]));
}
$interface = "/dev/serial/by-id/" . $r;
`stty -F {$interface} 230400 raw -echo`;
if ($dmx = fopen($interface, 'w+')) {
stream_set_blocking($dmx, 0);
stream_set_read_buffer($dmx, 2048);
$data = '';
dmx_set_levels($data);
dmx_set_dmx_receive_mode(SEND_ON_CHANGE_ONLY);
sleep(1);
while ($b = fread($dmx, 2048)) {
}
//empty the buffer
$data = "Hello World!";
dmx_set_parameters(27, 4, 40, $data);
if (!($c = dmx_request_parameters($read_buffer))) {
dmx_close();
return 0;
}
return $c;
}
return 0;
}
$argv = $_SERVER["argv"];
//$argv is an array
if ($argc == 0) {
error(usage());
}
$args = parse_args($argc, $argv);
if (isset($args['d'])) {
$debug = $args['d'];
} elseif (isset($args['debug'])) {
$debug = $args['debug'];
} else {
$debug = 0;
}
exec('stty -F /dev/ttyUSB0 115200 raw -echo');
if ($dmx = fopen('/dev/ttyUSB0', 'w+')) {
dmx_set_levels('');
$d1 = str_pad('', 128, chr(0));
$d2 = str_pad('', 128, chr(0));
dmx_set_levels_U1($d1);
dmx_set_levels_U2($d2);
$t = microtime(true);
for ($i = 0; $i <= 255; $i++) {
$d1 = str_pad('', 128, chr($i));
$d2 = str_pad('', 128, chr(255 - $i));
dmx_set_levels_U1($d1);
dmx_set_levels_U2($d2);
if ($must_exit) {
break;
}
}
fclose($dmx);
}
$f = 0;
if ($sn = dmx_request_serial_number()) {
printf("Found DMX Interface with Serial Number: %s\n", $sn);
if ($fw = dmx_request_parameters()) {
printf("Firmware Version: %s\n", $fw['FW_VER']);
printf("DMX Output Break Time: %s x 10.67 = %.02f us\n", $fw['DMX_BR_TIME'], $fw['DMX_BR_TIME'] * 10.67);
printf("DMX Mark After Break Time: %s x 10.67 = %.02f us\n", $fw['DMX_MABR_TIME'], $fw['DMX_MABR_TIME'] * 10.67);
printf("DMX Output Rate: %s packets/sec\n", $fw['DMX_OUTPUT_RATE']);
}
$f = 1;
}
if (!$f) {
die("Could not find a DMX interface!\n");
}
$d = '';
dmx_set_levels($d);
$d1 = str_pad('', 512, chr(0));
$d2 = str_pad('', 512, chr(0));
dmx_set_levels_U1($d1);
dmx_set_levels_U2($d2);
for ($i = 0; $i <= 255; $i++) {
$d1 = str_pad('', 512, chr($i));
$d2 = str_pad('', 512, chr(255 - $i));
dmx_set_levels_U1($d1);
dmx_set_levels_U2($d2);
if ($must_exit) {
break;
}
}
$dmx->deviceClose();
