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/*
* Copyright 2012 Thomas Tsou <ttsou@vt.edu>
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
* See the COPYING file in the main directory for details.
*/
#include <time.h>
#include <signal.h>
#include <GSMCommon.h>
#include <Logger.h>
#include <Configuration.h>
#include "Transceiver.h"
#include "radioDevice.h"
#define DEVICERATE (400e3 * CHAN_M)
ConfigurationTable gConfig("/etc/OpenBTS/OpenBTS.db");
volatile bool gbShutdown = false;
int Transceiver::mTSC = 0;
static void sigHandler(int signum)
{
LOG(NOTICE) << "Received shutdown signal";
gbShutdown = true;
}
static int setupSignals()
{
struct sigaction action;
action.sa_handler = sigHandler;
sigemptyset(&action.sa_mask);
action.sa_flags = 0;
if (sigaction(SIGINT, &action, NULL) < 0)
return -1;
if (sigaction(SIGTERM, &action, NULL) < 0)
return -1;
return 0;
}
/*
* Generate the channel-transceiver ordering. Attempt to match the RAD1
* ordering where the active channels are centered in the overall device
* bandwidth. C0 is always has the lowest ARFCN with increasing subsequent
* channels. When an even number of channels is selected, the carriers will
* be offset from the RF center by -200 kHz, or half ARFCN spacing.
*/
static void genChanMap(int numARFCN, int chanM, int *chans)
{
int i, n;
chans[0] = numARFCN / 2;
for (i = 1, n = 1; i < numARFCN; i++) {
if (!chans[i - 1])
chans[i] = chanM - 1;
else
chans[i] = chans[i - 1] - 1;
}
}
static void createTrx(Transceiver **trx, int *map, int num,
RadioInterface *radio, DriveLoop *drive)
{
int i;
bool primary = true;
for (i = 0; i < num; i++) {
LOG(NOTICE) << "Creating TRX" << i
<< " attached on channel " << map[i];
radio->activateChan(map[i]);
trx[i] = new Transceiver(5700 + 2 * i, "127.0.0.1",
SAMPSPERSYM, radio, drive,
map[i], primary);
trx[i]->start();
primary = false;
}
}
int main(int argc, char *argv[])
{
int i, chanM, numARFCN = 1;
int chanMap[CHAN_MAX];
RadioDevice *usrp;
RadioInterface* radio;
DriveLoop *drive;
Transceiver *trx[CHAN_MAX];
gLogInit("transceiver", gConfig.getStr("Log.Level").c_str(), LOG_LOCAL7);
if (argc > 1) {
numARFCN = atoi(argv[1]);
if (numARFCN > (CHAN_MAX - 1)) {
LOG(ALERT) << numARFCN << " channels not supported with current build";
exit(-1);
}
}
srandom(time(NULL));
if (setupSignals() < 0) {
LOG(ERR) << "Failed to setup signal handlers, exiting...";
exit(-1);
}
/*
* Select the number of channels according to the number of ARFCNs's
* and generate ARFCN-to-channelizer path mappings. The channelizer
* aliases and extracts 'M' equally spaced channels to baseband. The
* number of ARFCN's must be less than the number of channels in the
* channelizer.
*/
switch (numARFCN) {
case 1:
chanM = 1;
break;
case 2:
case 3:
chanM = 5;
break;
default:
chanM = 10;
}
genChanMap(numARFCN, chanM, chanMap);
usrp = RadioDevice::make(DEVICERATE);
if (!usrp->open()) {
LOG(ALERT) << "Failed to open device, exiting...";
return EXIT_FAILURE;
}
radio = new RadioInterface(usrp, chanM, 3, SAMPSPERSYM, 0, false);
drive = new DriveLoop(5700, "127.0.0.1", chanM, chanMap[0],
SAMPSPERSYM, GSM::Time(3,0), radio);
/* Create, attach, and activate all transceivers */
createTrx(trx, chanMap, numARFCN, radio, drive);
while (!gbShutdown) {
sleep(1);
}
LOG(NOTICE) << "Shutting down transceivers...";
for (i = 0; i < numARFCN; i++) {
trx[i]->shutdown();
}
/*
* Allow time for threads to end before we start freeing objects
*/
sleep(2);
for (i = 0; i < numARFCN; i++) {
delete trx[i];
}
delete drive;
delete radio;
delete usrp;
}
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