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 $c;
}
return 0;
}
//something changed in shm
for ($i = 0; $i < 128; $i++) {
if (substr($do1, $i * 2, 2) != substr($dmx_outputs1, $i * 2, 2)) {
//send xap dmx level change message for universe 1
send_dmx_output_level_event_message($i, XAPSRC_DMX_OUT1, XAPUID_DMX_OUT1, $do1, $donames1);
$outs1_changed = 1;
}
if (substr($do2, $i * 2, 2) != substr($dmx_outputs2, $i * 2, 2)) {
//send xap dmx level change message for universe 2
send_dmx_output_level_event_message($i, XAPSRC_DMX_OUT2, XAPUID_DMX_OUT2, $do2, $donames2);
$outs2_changed = 1;
}
}
}
if ($outs1_changed) {
$dmx_outputs1 = $do1;
dmx_set_levels_U1(bcd_to_chr($dmx_outputs1));
}
if ($outs2_changed) {
$dmx_outputs2 = $do2;
dmx_set_levels_U2(bcd_to_chr($dmx_outputs2));
}
usleep(5000);
}
}
dmx_set_dmx_receive_mode(SEND_ON_CHANGE_ONLY);
dmx_close();
dmx_write_state_file($dstate_file, $dmx_inputs, $dmx_outputs1, $dmx_outputs2);
socket_close($xap_sock_in);
shmop_close($shm_id);
logformat("hac_dmx exiting cleanly.\n");