/*
 * Licensed to the OpenAirInterface (OAI) Software Alliance under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The OpenAirInterface Software Alliance licenses this file to You under
 * the OAI Public License, Version 1.1  (the "License"); you may not use this file
 * except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.openairinterface.org/?page_id=698
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 *-------------------------------------------------------------------------------
 * For more information about the OpenAirInterface (OAI) Software Alliance:
 *      contact@openairinterface.org
 */

/*! \file lte-enb.c
 * \brief Top-level threads for eNodeB
 * \author R. Knopp, F. Kaltenberger, Navid Nikaein
 * \date 2012
 * \version 0.1
 * \company Eurecom
 * \email: knopp@eurecom.fr,florian.kaltenberger@eurecom.fr, navid.nikaein@eurecom.fr
 * \note
 * \warning
 */


#define _GNU_SOURCE             /* See feature_test_macros(7) */
#include <sched.h>


#include "T.h"

#include "rt_wrapper.h"


#undef MALLOC //there are two conflicting definitions, so we better make sure we don't use it at all

#include "assertions.h"
#include "msc.h"

#include "PHY/types.h"

#include "PHY/defs_UE.h"
#include "common/ran_context.h"
#include "common/config/config_userapi.h"
#include "common/utils/load_module_shlib.h"
#undef MALLOC //there are two conflicting definitions, so we better make sure we don't use it at all
//#undef FRAME_LENGTH_COMPLEX_SAMPLES //there are two conflicting definitions, so we better make sure we don't use it at all

#include "../../ARCH/COMMON/common_lib.h"
#include "../../ARCH/ETHERNET/USERSPACE/LIB/if_defs.h"

//#undef FRAME_LENGTH_COMPLEX_SAMPLES //there are two conflicting definitions, so we better make sure we don't use it at all

#include "PHY/phy_vars_ue.h"
#include "PHY/LTE_TRANSPORT/transport_vars.h"
#include "SCHED/sched_common_vars.h"
#include "PHY/MODULATION/modulation_vars.h"

#include "LAYER2/MAC/mac.h"
#include "LAYER2/MAC/mac_vars.h"
#include "LAYER2/MAC/mac_proto.h"
#include "RRC/LTE/rrc_vars.h"
#include "PHY_INTERFACE/phy_interface_vars.h"

#include "common/utils/LOG/log.h"
#include "UTIL/OTG/otg_tx.h"
#include "UTIL/OTG/otg_externs.h"
#include "UTIL/MATH/oml.h"
#include "common/utils/LOG/vcd_signal_dumper.h"
#include "UTIL/OPT/opt.h"
#include "enb_config.h"
//#include "PHY/TOOLS/time_meas.h"

#ifndef OPENAIR2
#include "UTIL/OTG/otg_vars.h"
#endif

#if defined(ENABLE_ITTI)
#include "create_tasks.h"
#endif

#include "system.h"

#ifdef XFORMS
#include "PHY/TOOLS/lte_phy_scope.h"
#include "stats.h"
#endif
#include "lte-softmodem.h"

RAN_CONTEXT_t RC;

/* temporary compilation wokaround (UE/eNB split */
uint16_t sf_ahead;
#ifdef XFORMS
// current status is that every UE has a DL scope for a SINGLE eNB (eNB_id=0)
// at eNB 0, an UL scope for every UE
FD_lte_phy_scope_ue  *form_ue[NUMBER_OF_UE_MAX];
FD_lte_phy_scope_enb *form_enb[MAX_NUM_CCs][NUMBER_OF_UE_MAX];
FD_stats_form                  *form_stats=NULL,*form_stats_l2=NULL;
char title[255];
unsigned char                   scope_enb_num_ue = 2;
static pthread_t                forms_thread; //xforms
#endif //XFORMS

pthread_cond_t nfapi_sync_cond;
pthread_mutex_t nfapi_sync_mutex;
int nfapi_sync_var=-1; //!< protected by mutex \ref nfapi_sync_mutex

uint8_t nfapi_mode = 0;

uint16_t sf_ahead=2;

char *emul_iface;


pthread_cond_t sync_cond;
pthread_mutex_t sync_mutex;
int sync_var=-1; //!< protected by mutex \ref sync_mutex.
int config_sync_var=-1;

uint16_t runtime_phy_rx[29][6]; // SISO [MCS 0-28][RBs 0-5 : 6, 15, 25, 50, 75, 100]
uint16_t runtime_phy_tx[29][6]; // SISO [MCS 0-28][RBs 0-5 : 6, 15, 25, 50, 75, 100]

#if defined(ENABLE_ITTI)
volatile int             start_eNB = 0;
volatile int             start_UE = 0;
#endif
volatile int             oai_exit = 0;

clock_source_t clock_source = internal;
static int wait_for_sync = 0;

unsigned int                    mmapped_dma=0;
int                             single_thread_flag=1;

static int8_t                     threequarter_fs=0;

uint32_t                 downlink_frequency[MAX_NUM_CCs][4];
int32_t                  uplink_frequency_offset[MAX_NUM_CCs][4];



int UE_scan = 1;
int UE_scan_carrier = 0;
int simL1flag = 0;
int snr_dB=25;

runmode_t mode = normal_txrx;

FILE *input_fd=NULL;


#if MAX_NUM_CCs == 1
rx_gain_t                rx_gain_mode[MAX_NUM_CCs][4] = {{max_gain,max_gain,max_gain,max_gain}};
double tx_gain[MAX_NUM_CCs][4] = {{20,0,0,0}};
double rx_gain[MAX_NUM_CCs][4] = {{130,0,0,0}};
#else
rx_gain_t                rx_gain_mode[MAX_NUM_CCs][4] = {{max_gain,max_gain,max_gain,max_gain},{max_gain,max_gain,max_gain,max_gain}};
double tx_gain[MAX_NUM_CCs][4] = {{20,0,0,0},{20,0,0,0}};
double rx_gain[MAX_NUM_CCs][4] = {{130,0,0,0},{20,0,0,0}};
#endif

double rx_gain_off = 0.0;

double sample_rate=30.72e6;
double bw = 10.0e6;

static int                      tx_max_power[MAX_NUM_CCs]; /* =  {0,0}*/;

char   rf_config_file[1024];

int chain_offset=0;
int phy_test = 0;
uint8_t usim_test = 0;

uint8_t dci_Format = 0;
uint8_t agregation_Level =0xFF;

uint8_t nb_antenna_tx = 1;
uint8_t nb_antenna_rx = 1;

char ref[128] = "internal";
char channels[128] = "0";

int                      rx_input_level_dBm;

#ifdef XFORMS
extern int                      otg_enabled;
static char                     do_forms=0;
#else
int                             otg_enabled;
#endif
//int                             number_of_cards =   1;


static LTE_DL_FRAME_PARMS      *frame_parms[MAX_NUM_CCs];
uint32_t target_dl_mcs = 28; //maximum allowed mcs
uint32_t target_ul_mcs = 20;
uint32_t timing_advance = 0;
uint8_t exit_missed_slots=1;
uint64_t num_missed_slots=0; // counter for the number of missed slots


extern void init_UE_stub_single_thread(int nb_inst,int eMBMS_active, int uecap_xer_in, char *emul_iface);

extern PHY_VARS_UE* init_ue_vars(LTE_DL_FRAME_PARMS *frame_parms,
			  uint8_t UE_id,
			  uint8_t abstraction_flag);


int transmission_mode=1;

int emulate_rf = 0;
int numerology = 0;
int codingw = 0;
int fepw = 0;

/* struct for ethernet specific parameters given in eNB conf file */
eth_params_t *eth_params;

openair0_config_t openair0_cfg[MAX_CARDS];

double cpuf;

extern char uecap_xer[1024];
char uecap_xer_in=0;

int oaisim_flag=0;
threads_t threads= {-1,-1,-1,-1,-1,-1,-1};

/* see file openair2/LAYER2/MAC/main.c for why abstraction_flag is needed
 * this is very hackish - find a proper solution
 */
uint8_t abstraction_flag=0;

/* forward declarations */
void set_default_frame_parms(LTE_DL_FRAME_PARMS *frame_parms[MAX_NUM_CCs]);

/*---------------------BMC: timespec helpers -----------------------------*/

struct timespec min_diff_time = { .tv_sec = 0, .tv_nsec = 0 };
struct timespec max_diff_time = { .tv_sec = 0, .tv_nsec = 0 };

struct timespec clock_difftime(struct timespec start, struct timespec end) {
  struct timespec temp;
  if ((end.tv_nsec-start.tv_nsec)<0) {
    temp.tv_sec = end.tv_sec-start.tv_sec-1;
    temp.tv_nsec = 1000000000+end.tv_nsec-start.tv_nsec;
  } else {
    temp.tv_sec = end.tv_sec-start.tv_sec;
    temp.tv_nsec = end.tv_nsec-start.tv_nsec;
  }
  return temp;
}

void print_difftimes(void) {
#ifdef DEBUG
  printf("difftimes min = %lu ns ; max = %lu ns\n", min_diff_time.tv_nsec, max_diff_time.tv_nsec);
#else
  LOG_I(HW,"difftimes min = %lu ns ; max = %lu ns\n", min_diff_time.tv_nsec, max_diff_time.tv_nsec);
#endif
}

void update_difftimes(struct timespec start, struct timespec end) {
  struct timespec diff_time = { .tv_sec = 0, .tv_nsec = 0 };
  int             changed = 0;
  diff_time = clock_difftime(start, end);
  if ((min_diff_time.tv_nsec == 0) || (diff_time.tv_nsec < min_diff_time.tv_nsec)) {
    min_diff_time.tv_nsec = diff_time.tv_nsec;
    changed = 1;
  }
  if ((max_diff_time.tv_nsec == 0) || (diff_time.tv_nsec > max_diff_time.tv_nsec)) {
    max_diff_time.tv_nsec = diff_time.tv_nsec;
    changed = 1;
  }
#if 1
  if (changed) print_difftimes();
#endif
}

/*------------------------------------------------------------------------*/

unsigned int build_rflocal(int txi, int txq, int rxi, int rxq) {
  return (txi + (txq<<6) + (rxi<<12) + (rxq<<18));
}
unsigned int build_rfdc(int dcoff_i_rxfe, int dcoff_q_rxfe) {
  return (dcoff_i_rxfe + (dcoff_q_rxfe<<8));
}

#if !defined(ENABLE_ITTI)
void signal_handler(int sig) {
  void *array[10];
  size_t size;

  if (sig==SIGSEGV) {
    // get void*'s for all entries on the stack
    size = backtrace(array, 10);

    // print out all the frames to stderr
    fprintf(stderr, "Error: signal %d:\n", sig);
    backtrace_symbols_fd(array, size, 2);
    exit(-1);
  } else {
    printf("trying to exit gracefully...\n");
    oai_exit = 1;
  }
}
#endif
#define KNRM  "\x1B[0m"
#define KRED  "\x1B[31m"
#define KGRN  "\x1B[32m"
#define KBLU  "\x1B[34m"
#define RESET "\033[0m"



void exit_function(const char* file, const char* function, const int line, const char* s)
{
  int CC_id;

  logClean();
  if (s != NULL) {
    printf("%s:%d %s() Exiting OAI softmodem: %s\n",file,line, function, s);
  }

  oai_exit = 1;

  for(CC_id=0; CC_id<MAX_NUM_CCs; CC_id++) {
     if (PHY_vars_UE_g)
      if (PHY_vars_UE_g[0])
         if (PHY_vars_UE_g[0][CC_id])
	    if (PHY_vars_UE_g[0][CC_id]->rfdevice.trx_end_func)
	        PHY_vars_UE_g[0][CC_id]->rfdevice.trx_end_func(&PHY_vars_UE_g[0][CC_id]->rfdevice);
    }

    sleep(1); //allow lte-softmodem threads to exit first
#if defined(ENABLE_ITTI)
    itti_terminate_tasks (TASK_UNKNOWN);
#endif
  exit(1);
}

#ifdef XFORMS


void reset_stats(FL_OBJECT *button, long arg)
{
  int i,j,k;
  PHY_VARS_eNB *phy_vars_eNB = RC.eNB[0][0];

  for (i=0; i<NUMBER_OF_UE_MAX; i++) {
    for (k=0; k<8; k++) { //harq_processes
      for (j=0; j<phy_vars_eNB->dlsch[i][0]->Mlimit; j++) {
	phy_vars_eNB->UE_stats[i].dlsch_NAK[k][j]=0;
	phy_vars_eNB->UE_stats[i].dlsch_ACK[k][j]=0;
	phy_vars_eNB->UE_stats[i].dlsch_trials[k][j]=0;
      }

      phy_vars_eNB->UE_stats[i].dlsch_l2_errors[k]=0;
      phy_vars_eNB->UE_stats[i].ulsch_errors[k]=0;
      phy_vars_eNB->UE_stats[i].ulsch_consecutive_errors=0;


      phy_vars_eNB->UE_stats[i].dlsch_sliding_cnt=0;
      phy_vars_eNB->UE_stats[i].dlsch_NAK_round0=0;
      phy_vars_eNB->UE_stats[i].dlsch_mcs_offset=0;
    }
  }
}

static void *scope_thread(void *arg) {
  char stats_buffer[16384];
# ifdef ENABLE_XFORMS_WRITE_STATS
  FILE *UE_stats, *eNB_stats;
# endif
  struct sched_param sched_param;


  sched_param.sched_priority = sched_get_priority_min(SCHED_FIFO)+1;
  sched_setscheduler(0, SCHED_FIFO,&sched_param);

  printf("Scope thread has priority %d\n",sched_param.sched_priority);

# ifdef ENABLE_XFORMS_WRITE_STATS

  UE_stats  = fopen("UE_stats.txt", "w");

#endif

  while (!oai_exit) {
    //      dump_ue_stats (PHY_vars_UE_g[0][0], &PHY_vars_UE_g[0][0]->proc.proc_rxtx[0],stats_buffer, 0, mode,rx_input_level_dBm);
      //fl_set_object_label(form_stats->stats_text, stats_buffer);
      fl_clear_browser(form_stats->stats_text);
      fl_add_browser_line(form_stats->stats_text, stats_buffer);

      phy_scope_UE(form_ue[0],
		   PHY_vars_UE_g[0][0],
		   0,
		   0,7);

  //  printf("%s",stats_buffer);
    }
# ifdef ENABLE_XFORMS_WRITE_STATS

    if (UE_stats) {
      rewind (UE_stats);
      fwrite (stats_buffer, 1, len, UE_stats);
      fclose (UE_stats);
    }

# endif
  
  pthread_exit((void*)arg);
}
#endif



#if defined(ENABLE_ITTI)
void *l2l1_task(void *arg) {
  MessageDef *message_p = NULL;
  int         result;

  itti_set_task_real_time(TASK_L2L1);
  itti_mark_task_ready(TASK_L2L1);


  do {
    // Wait for a message
    itti_receive_msg (TASK_L2L1, &message_p);

    switch (ITTI_MSG_ID(message_p)) {
    case TERMINATE_MESSAGE:
      oai_exit=1;
      itti_exit_task ();
      break;

    case ACTIVATE_MESSAGE:
      start_UE = 1;
      break;

    case DEACTIVATE_MESSAGE:
      start_UE = 0;
      break;

    case MESSAGE_TEST:
      LOG_I(SIM, "Received %s\n", ITTI_MSG_NAME(message_p));
      break;

    default:
      LOG_E(SIM, "Received unexpected message %s\n", ITTI_MSG_NAME(message_p));
      break;
    }

    result = itti_free (ITTI_MSG_ORIGIN_ID(message_p), message_p);
    AssertFatal (result == EXIT_SUCCESS, "Failed to free memory (%d)!\n", result);
  } while(!oai_exit);

  return NULL;
}
#endif

extern int16_t dlsch_demod_shift;

static void get_options(unsigned int *start_msc) {
  int CC_id;
  int tddflag, nonbiotflag;
  char *loopfile=NULL;
  int dumpframe;
  uint32_t online_log_messages;
  uint32_t glog_level;
  uint32_t start_telnetsrv;

  paramdef_t cmdline_params[] =CMDLINE_PARAMS_DESC ;
  paramdef_t cmdline_logparams[] =CMDLINE_LOGPARAMS_DESC ;

  set_default_frame_parms(frame_parms);
  CONFIG_SETRTFLAG(CONFIG_NOEXITONHELP);
  config_process_cmdline( cmdline_params,sizeof(cmdline_params)/sizeof(paramdef_t),NULL); 

  if (strlen(in_path) > 0) {
      opt_type = OPT_PCAP;
      opt_enabled=1;
      printf("Enabling OPT for PCAP  with the following file %s \n",in_path);
  }
  if (strlen(in_ip) > 0) {
      opt_enabled=1;
      opt_type = OPT_WIRESHARK;
      printf("Enabling OPT for wireshark for local interface");
  }

  config_process_cmdline( cmdline_logparams,sizeof(cmdline_logparams)/sizeof(paramdef_t),NULL);
  if(config_isparamset(cmdline_logparams,CMDLINE_ONLINELOG_IDX)) {
      set_glog_onlinelog(online_log_messages);
  }
  if(config_isparamset(cmdline_logparams,CMDLINE_GLOGLEVEL_IDX)) {
      set_glog(glog_level);
  }
  if (start_telnetsrv) {
     load_module_shlib("telnetsrv",NULL,0,NULL);
  }

  paramdef_t cmdline_uemodeparams[] =CMDLINE_UEMODEPARAMS_DESC;
  paramdef_t cmdline_ueparams[] =CMDLINE_UEPARAMS_DESC;


  config_process_cmdline( cmdline_uemodeparams,sizeof(cmdline_uemodeparams)/sizeof(paramdef_t),NULL);
  CONFIG_CLEARRTFLAG(CONFIG_NOEXITONHELP);
  config_process_cmdline( cmdline_ueparams,sizeof(cmdline_ueparams)/sizeof(paramdef_t),NULL);
  if (loopfile != NULL) {
      printf("Input file for hardware emulation: %s",loopfile);
      mode=loop_through_memory;
      input_fd = fopen(loopfile,"r");
      AssertFatal(input_fd != NULL,"Please provide a valid input file\n");
  }

  if ( (cmdline_uemodeparams[CMDLINE_CALIBUERX_IDX].paramflags &  PARAMFLAG_PARAMSET) != 0) mode = rx_calib_ue;
  if ( (cmdline_uemodeparams[CMDLINE_CALIBUERXMED_IDX].paramflags &  PARAMFLAG_PARAMSET) != 0) mode = rx_calib_ue_med;
  if ( (cmdline_uemodeparams[CMDLINE_CALIBUERXBYP_IDX].paramflags &  PARAMFLAG_PARAMSET) != 0) mode = rx_calib_ue_byp;
  if (cmdline_uemodeparams[CMDLINE_DEBUGUEPRACH_IDX].uptr)
      if ( *(cmdline_uemodeparams[CMDLINE_DEBUGUEPRACH_IDX].uptr) > 0) mode = debug_prach;
  if (cmdline_uemodeparams[CMDLINE_NOL2CONNECT_IDX].uptr)
      if ( *(cmdline_uemodeparams[CMDLINE_NOL2CONNECT_IDX].uptr) > 0)  mode = no_L2_connect;
  if (cmdline_uemodeparams[CMDLINE_CALIBPRACHTX_IDX].uptr) 
      if ( *(cmdline_uemodeparams[CMDLINE_CALIBPRACHTX_IDX].uptr) > 0) mode = calib_prach_tx; 
  if (dumpframe  > 0)  mode = rx_dump_frame;
  
  for (CC_id=0; CC_id<MAX_NUM_CCs; CC_id++) {
    frame_parms[CC_id]->dl_CarrierFreq = downlink_frequency[0][0];
  }
  UE_scan=0;
   
    if (tddflag > 0) {
     for (CC_id=0; CC_id<MAX_NUM_CCs; CC_id++) 
    	 frame_parms[CC_id]->frame_type = TDD;
  }

  if (frame_parms[0]->N_RB_DL !=0) {
      if ( frame_parms[0]->N_RB_DL < 6 ) {
    	 frame_parms[0]->N_RB_DL = 6;
    	 printf ( "%i: Invalid number of ressource blocks, adjusted to 6\n",frame_parms[0]->N_RB_DL);
      }
      if ( frame_parms[0]->N_RB_DL > 100 ) {
    	 frame_parms[0]->N_RB_DL = 100;
    	 printf ( "%i: Invalid number of ressource blocks, adjusted to 100\n",frame_parms[0]->N_RB_DL);
      }
      if ( frame_parms[0]->N_RB_DL > 50 && frame_parms[0]->N_RB_DL < 100 ) {
    	 frame_parms[0]->N_RB_DL = 50;
    	 printf ( "%i: Invalid number of ressource blocks, adjusted to 50\n",frame_parms[0]->N_RB_DL);
      }
      if ( frame_parms[0]->N_RB_DL > 25 && frame_parms[0]->N_RB_DL < 50 ) {
    	 frame_parms[0]->N_RB_DL = 25;
    	 printf ( "%i: Invalid number of ressource blocks, adjusted to 25\n",frame_parms[0]->N_RB_DL);
      }
      UE_scan = 0;
      frame_parms[0]->N_RB_UL=frame_parms[0]->N_RB_DL;
      for (CC_id=1; CC_id<MAX_NUM_CCs; CC_id++) {
    	  frame_parms[CC_id]->N_RB_DL=frame_parms[0]->N_RB_DL;
    	  frame_parms[CC_id]->N_RB_UL=frame_parms[0]->N_RB_UL;
      }
  }


  for (CC_id=1;CC_id<MAX_NUM_CCs;CC_id++) {
    	rx_gain[0][CC_id] = rx_gain[0][0];
    	tx_gain[0][CC_id] = tx_gain[0][0];
  }

  /*
  if ( !(CONFIG_ISFLAGSET(CONFIG_ABORT))  && (!(CONFIG_ISFLAGSET(CONFIG_NOOOPT))) ) {
    // Here the configuration file is the XER encoded UE capabilities
    // Read it in and store in asn1c data structures
    sprintf(uecap_xer,"%stargets/PROJECTS/GENERIC-LTE-EPC/CONF/UE_config.xml",getenv("OPENAIR_HOME"));
    printf("%s\n",uecap_xer);
    if(nfapi_mode!=3)
    	uecap_xer_in=1;
	} *//* UE with config file  */
}


void set_default_frame_parms(LTE_DL_FRAME_PARMS *frame_parms[MAX_NUM_CCs]) {

  int CC_id;

  for (CC_id=0; CC_id<MAX_NUM_CCs; CC_id++) {
    frame_parms[CC_id] = (LTE_DL_FRAME_PARMS*) malloc(sizeof(LTE_DL_FRAME_PARMS));
    /* Set some default values that may be overwritten while reading options */
    frame_parms[CC_id]->frame_type          = FDD;
    frame_parms[CC_id]->tdd_config          = 3;
    frame_parms[CC_id]->tdd_config_S        = 0;
    frame_parms[CC_id]->N_RB_DL             = 100;
    frame_parms[CC_id]->N_RB_UL             = 100;
    frame_parms[CC_id]->Ncp                 = NORMAL;
    frame_parms[CC_id]->Ncp_UL              = NORMAL;
    frame_parms[CC_id]->Nid_cell            = 0;
    frame_parms[CC_id]->num_MBSFN_config    = 0;
    frame_parms[CC_id]->nb_antenna_ports_eNB  = 1;
    frame_parms[CC_id]->nb_antennas_tx      = 1;
    frame_parms[CC_id]->nb_antennas_rx      = 1;

    frame_parms[CC_id]->nushift             = 0;

    frame_parms[CC_id]->phich_config_common.phich_resource = oneSixth;
    frame_parms[CC_id]->phich_config_common.phich_duration = normal;
    // UL RS Config
    frame_parms[CC_id]->pusch_config_common.ul_ReferenceSignalsPUSCH.cyclicShift = 0;//n_DMRS1 set to 0
    frame_parms[CC_id]->pusch_config_common.ul_ReferenceSignalsPUSCH.groupHoppingEnabled = 0;
    frame_parms[CC_id]->pusch_config_common.ul_ReferenceSignalsPUSCH.sequenceHoppingEnabled = 0;
    frame_parms[CC_id]->pusch_config_common.ul_ReferenceSignalsPUSCH.groupAssignmentPUSCH = 0;

    frame_parms[CC_id]->prach_config_common.rootSequenceIndex=22;
    frame_parms[CC_id]->prach_config_common.prach_ConfigInfo.zeroCorrelationZoneConfig=1;
    frame_parms[CC_id]->prach_config_common.prach_ConfigInfo.prach_ConfigIndex=0;
    frame_parms[CC_id]->prach_config_common.prach_ConfigInfo.highSpeedFlag=0;
    frame_parms[CC_id]->prach_config_common.prach_ConfigInfo.prach_FreqOffset=0;

    downlink_frequency[CC_id][0] = DEFAULT_DLF; // Use float to avoid issue with frequency over 2^31.
    downlink_frequency[CC_id][1] = downlink_frequency[CC_id][0];
    downlink_frequency[CC_id][2] = downlink_frequency[CC_id][0];
    downlink_frequency[CC_id][3] = downlink_frequency[CC_id][0];

    frame_parms[CC_id]->dl_CarrierFreq=downlink_frequency[CC_id][0];

  }

}

void init_openair0(LTE_DL_FRAME_PARMS *frame_parms,int rxgain) {

  int card;
  int i;

  for (card=0; card<MAX_CARDS; card++) {

    openair0_cfg[card].mmapped_dma=mmapped_dma;
    openair0_cfg[card].configFilename = NULL;

    if(frame_parms->N_RB_DL == 100) {
      if (frame_parms->threequarter_fs) {
	openair0_cfg[card].sample_rate=23.04e6;
	openair0_cfg[card].samples_per_frame = 230400;
	openair0_cfg[card].tx_bw = 10e6;
	openair0_cfg[card].rx_bw = 10e6;
      } else {
	openair0_cfg[card].sample_rate=30.72e6;
	openair0_cfg[card].samples_per_frame = 307200;
	openair0_cfg[card].tx_bw = 10e6;
	openair0_cfg[card].rx_bw = 10e6;
      }
    } else if(frame_parms->N_RB_DL == 50) {
      openair0_cfg[card].sample_rate=15.36e6;
      openair0_cfg[card].samples_per_frame = 153600;
      openair0_cfg[card].tx_bw = 5e6;
      openair0_cfg[card].rx_bw = 5e6;
    } else if (frame_parms->N_RB_DL == 25) {
      openair0_cfg[card].sample_rate=7.68e6;
      openair0_cfg[card].samples_per_frame = 76800;
      openair0_cfg[card].tx_bw = 2.5e6;
      openair0_cfg[card].rx_bw = 2.5e6;
    } else if (frame_parms->N_RB_DL == 6) {
      openair0_cfg[card].sample_rate=1.92e6;
      openair0_cfg[card].samples_per_frame = 19200;
      openair0_cfg[card].tx_bw = 1.5e6;
      openair0_cfg[card].rx_bw = 1.5e6;
    }




    if (frame_parms->frame_type==TDD)
      openair0_cfg[card].duplex_mode = duplex_mode_TDD;
    else //FDD
      openair0_cfg[card].duplex_mode = duplex_mode_FDD;

    openair0_cfg[card].Mod_id = 0;

    openair0_cfg[card].num_rb_dl=frame_parms->N_RB_DL;

    openair0_cfg[card].clock_source = clock_source;


    openair0_cfg[card].tx_num_channels=min(2,frame_parms->nb_antennas_tx);
    openair0_cfg[card].rx_num_channels=min(2,frame_parms->nb_antennas_rx);

    for (i=0; i<4; i++) {

      if (i<openair0_cfg[card].tx_num_channels)
	openair0_cfg[card].tx_freq[i] = downlink_frequency[0][i]+uplink_frequency_offset[0][i];
      else
	openair0_cfg[card].tx_freq[i]=0.0;

      if (i<openair0_cfg[card].rx_num_channels)
	openair0_cfg[card].rx_freq[i] = downlink_frequency[0][i];
      else
	openair0_cfg[card].rx_freq[i]=0.0;

      openair0_cfg[card].autocal[i] = 1;
      openair0_cfg[card].tx_gain[i] = tx_gain[0][i];
      openair0_cfg[card].rx_gain[i] = rxgain - rx_gain_off;
     

      openair0_cfg[card].configFilename = rf_config_file;
      printf("Card %d, channel %d, Setting tx_gain %f, rx_gain %f, tx_freq %f, rx_freq %f\n",
	     card,i, openair0_cfg[card].tx_gain[i],
	     openair0_cfg[card].rx_gain[i],
	     openair0_cfg[card].tx_freq[i],
	     openair0_cfg[card].rx_freq[i]);
    }
  }
}




#if defined(ENABLE_ITTI)
/*
 * helper function to terminate a certain ITTI task
 */
void terminate_task(task_id_t task_id, module_id_t mod_id)
{
  LOG_I(ENB_APP, "sending TERMINATE_MESSAGE to task %s (%d)\n", itti_get_task_name(task_id), task_id);
  MessageDef *msg;
  msg = itti_alloc_new_message (ENB_APP, TERMINATE_MESSAGE);
  itti_send_msg_to_task (task_id, ENB_MODULE_ID_TO_INSTANCE(mod_id), msg);
}



#endif



static inline void wait_nfapi_init(char *thread_name) {

  printf( "waiting for NFAPI PNF connection and population of global structure (%s)\n",thread_name);
  pthread_mutex_lock( &nfapi_sync_mutex );

  while (nfapi_sync_var<0)
    pthread_cond_wait( &nfapi_sync_cond, &nfapi_sync_mutex );

  pthread_mutex_unlock(&nfapi_sync_mutex);

  printf( "NFAPI: got sync (%s)\n", thread_name);
}

int stop_L1L2(module_id_t enb_id)
{
	return 0;
}


int restart_L1L2(module_id_t enb_id)
{
	return 0;
}

int main( int argc, char **argv )
{
#if defined (XFORMS)
  void *status;
#endif

  int CC_id;
  uint8_t  abstraction_flag=0;
  unsigned int start_msc=0;

  // Default value for the number of UEs. It will hold,
  // if not changed from the command line option --num-ues
  NB_UE_INST=1;

#if defined (XFORMS)
  int ret;
#endif

  start_background_system();
  if ( load_configmodule(argc,argv) == NULL) {
    exit_fun("[SOFTMODEM] Error, configuration module init failed\n");
  } 
      


  mode = normal_txrx;
  memset(&openair0_cfg[0],0,sizeof(openair0_config_t)*MAX_CARDS);


  set_latency_target();

  logInit();

  printf("Reading in command-line options\n");

  for (int i=0;i<MAX_NUM_CCs;i++) tx_max_power[i]=23; 
  get_options (&start_msc);


  printf("Running with %d UE instances\n",NB_UE_INST);
  if (NB_UE_INST > 1 && simL1flag != 1) {
    printf("Running with more than 1 UE instance and simL1 is not active, this will result in undefined behaviour for now, exiting.\n");
    abort();
  }

  printf("NFAPI_MODE value: %d \n", nfapi_mode);

  // Not sure if the following is needed here
  /*if (CONFIG_ISFLAGSET(CONFIG_ABORT)) {
      if (UE_flag == 0) {
        fprintf(stderr,"Getting configuration failed\n");
        exit(-1);
      }
      else {
        printf("Setting nfapi mode to UE_STUB_OFFNET\n");
        nfapi_mode = 4;
      }
    }*/


#if T_TRACER
  T_Config_Init();
#endif



  //randominit (0);
  set_taus_seed (0);

  cpuf=get_cpu_freq_GHz();

  pthread_cond_init(&sync_cond,NULL);
  pthread_mutex_init(&sync_mutex, NULL);

#if defined(ENABLE_ITTI)



  printf("ITTI init\n");
  itti_init(TASK_MAX, THREAD_MAX, MESSAGES_ID_MAX, tasks_info, messages_info);

  // initialize mscgen log after ITTI
  if (start_msc) {
     load_module_shlib("msc",NULL,0,&msc_interface);
  }
  MSC_INIT(MSC_E_UTRAN, THREAD_MAX+TASK_MAX);
#endif

  if (opt_type != OPT_NONE) {
    if (init_opt(in_path, in_ip) == -1)
      LOG_E(OPT,"failed to run OPT \n");
  }

#ifdef PDCP_USE_NETLINK
  printf("PDCP netlink\n");
  netlink_init();
#if defined(PDCP_USE_NETLINK_QUEUES)
  pdcp_netlink_init();
#endif
#endif

//TTN for D2D
#if (RRC_VERSION >= MAKE_VERSION(14, 0, 0))
  printf ("RRC control socket\n");
  rrc_control_socket_init();
  printf ("PDCP PC5S socket\n");
  pdcp_pc5_socket_init();
#endif

#if !defined(ENABLE_ITTI)
  // to make a graceful exit when ctrl-c is pressed
  signal(SIGSEGV, signal_handler);
  signal(SIGINT, signal_handler);
#endif


  check_clock();

#ifndef PACKAGE_VERSION
#  define PACKAGE_VERSION "UNKNOWN-EXPERIMENTAL"
#endif

  LOG_I(HW, "Version: %s\n", PACKAGE_VERSION);

  // init the parameters
  for (CC_id=0; CC_id<MAX_NUM_CCs; CC_id++) {
      frame_parms[CC_id]->nb_antennas_tx     = nb_antenna_tx;
      frame_parms[CC_id]->nb_antennas_rx     = nb_antenna_rx;
      frame_parms[CC_id]->nb_antenna_ports_eNB = 1; //initial value overwritten by initial sync later
  }



  NB_INST=1;
  if(nfapi_mode == 3){
	  PHY_vars_UE_g = malloc(sizeof(PHY_VARS_UE**)*NB_UE_INST);
	  	  for (int i=0; i<NB_UE_INST; i++) {
	  		  for (CC_id=0; CC_id<MAX_NUM_CCs; CC_id++) {
	  			PHY_vars_UE_g[i] = malloc(sizeof(PHY_VARS_UE*)*MAX_NUM_CCs);
	  			PHY_vars_UE_g[i][CC_id] = init_ue_vars(frame_parms[CC_id], i,abstraction_flag);


	  			if (phy_test==1)
	  				PHY_vars_UE_g[i][CC_id]->mac_enabled = 0;
	  			else
	  				PHY_vars_UE_g[i][CC_id]->mac_enabled = 1;
	  		}
	  	  }
  }
  else init_openair0(frame_parms[0],(int)rx_gain[0][0]);


  if (simL1flag==1) {
    AssertFatal(NULL!=load_configmodule(argc,argv),
                "[SOFTMODEM] Error, configuration module init failed\n");

    RCConfig_sim();
  }

  // start the main UE threads
  int eMBMS_active = 0;

  if (nfapi_mode==3) // UE-STUB-PNF
  {
      config_sync_var=0;
      wait_nfapi_init("main?");
      //Panos: Temporarily we will be using single set of threads for multiple UEs.
      //init_UE_stub(1,eMBMS_active,uecap_xer_in,emul_iface);
      init_UE_stub_single_thread(NB_UE_INST,eMBMS_active,uecap_xer_in,emul_iface);
  }
  else {
      init_UE(NB_UE_INST,eMBMS_active,uecap_xer_in,0,phy_test,UE_scan,UE_scan_carrier,mode,(int)rx_gain[0][0],tx_max_power[0],
              frame_parms[0]);
  }


  if (phy_test==0) {
    printf("Filling UE band info\n");
    fill_ue_band_info();
    dl_phy_sync_success (0, 0, 0, 1);
  }

  if (nfapi_mode!=3){
      number_of_cards = 1;
      for(CC_id=0; CC_id<MAX_NUM_CCs; CC_id++) {
              PHY_vars_UE_g[0][CC_id]->rf_map.card=0;
              PHY_vars_UE_g[0][CC_id]->rf_map.chain=CC_id+chain_offset;
      }
  }

  
  cpuf=get_cpu_freq_GHz();
  
  
  
#ifndef DEADLINE_SCHEDULER
  
  printf("NO deadline scheduler\n");
  /* Currently we set affinity for UHD to CPU 0 for eNB/UE and only if number of CPUS >2 */
  
  cpu_set_t cpuset;
  int s;
  char cpu_affinity[1024];
  CPU_ZERO(&cpuset);
#ifdef CPU_AFFINITY
  if (get_nprocs() > 2) {
    CPU_SET(0, &cpuset);
    s = pthread_setaffinity_np(pthread_self(), sizeof(cpu_set_t), &cpuset);
    if (s != 0) {
      perror( "pthread_setaffinity_np");
      exit_fun("Error setting processor affinity");
    }
    LOG_I(HW, "Setting the affinity of main function to CPU 0, for device library to use CPU 0 only!\n");
  }
#endif
  
  /* Check the actual affinity mask assigned to the thread */
  s = pthread_getaffinity_np(pthread_self(), sizeof(cpu_set_t), &cpuset);
  if (s != 0) {
    perror( "pthread_getaffinity_np");
    exit_fun("Error getting processor affinity ");
  }
  memset(cpu_affinity, 0 , sizeof(cpu_affinity));
  for (int j = 0; j < CPU_SETSIZE; j++) {
    if (CPU_ISSET(j, &cpuset)) {
      char temp[1024];
      sprintf(temp, " CPU_%d ", j);
      strcat(cpu_affinity, temp);
    }
  }
  LOG_I(HW, "CPU Affinity of main() function is... %s\n", cpu_affinity);
#endif
  

  
  
#if defined(ENABLE_ITTI)
    if (create_tasks_ue(1) < 0) {
      printf("cannot create ITTI tasks\n");
      exit(-1); // need a softer mode
    }
    if(nfapi_mode==3){ // Here we should add another nfapi_mode for the case of Supervised LTE-D2D
    	UE_config_stub_pnf();
    }
    printf("ITTI tasks created\n");
#endif

  
  mlockall(MCL_CURRENT | MCL_FUTURE);
  
 
  rt_sleep_ns(10*100000000ULL);

  const char *nfapi_mode_str = "<UNKNOWN>";

    switch(nfapi_mode)
    {
      case 0:
        nfapi_mode_str = "MONOLITHIC";
        break;
      case 1:
        nfapi_mode_str = "PNF";
        break;
      case 2:
        nfapi_mode_str = "VNF";
        break;
      case 3:
        nfapi_mode_str = "UE_STUB_PNF";
        break;
      case 4:
        nfapi_mode_str = "UE_STUB_OFFNET";
        break;
      default:
        nfapi_mode_str = "<UNKNOWN NFAPI MODE>";
        break;
    }
    printf("NFAPI MODE:%s\n", nfapi_mode_str);


  // connect the TX/RX buffers

      
    /*  
    if(nfapi_mode!=3) {
    	if (setup_ue_buffers(PHY_vars_UE_g[0],&openair0_cfg[0])!=0) {
    		printf("Error setting up eNB buffer\n");
    		exit(-1);
    	}
    }
   */ 
    
    

    if (input_fd) {
      printf("Reading in from file to antenna buffer %d\n",0);
      if (fread(PHY_vars_UE_g[0][0]->common_vars.rxdata[0],
		sizeof(int32_t),
		frame_parms[0]->samples_per_tti*10,
		input_fd) != frame_parms[0]->samples_per_tti*10)
	printf("error reading from file\n");
    }
    //p_exmimo_config->framing.tdd_config = TXRXSWITCH_TESTRX;

 
  if (simL1flag==1)  {
     init_ocm((double)snr_dB,0);
     PHY_vars_UE_g[0][0]->no_timing_correction = 1;
  }
 


#ifdef XFORMS
  int UE_id;
  
  printf("XFORMS\n");

  if (do_forms==1) {
    fl_initialize (&argc, argv, NULL, 0, 0);
    
      form_stats = create_form_stats_form();
      fl_show_form (form_stats->stats_form, FL_PLACE_HOTSPOT, FL_FULLBORDER, "stats");
      UE_id = 0;
      form_ue[UE_id] = create_lte_phy_scope_ue();
      sprintf (title, "LTE DL SCOPE UE");
      fl_show_form (form_ue[UE_id]->lte_phy_scope_ue, FL_PLACE_HOTSPOT, FL_FULLBORDER, title);
      
      /*
	if (openair_daq_vars.use_ia_receiver) {
	fl_set_button(form_ue[UE_id]->button_0,1);
	fl_set_object_label(form_ue[UE_id]->button_0, "IA Receiver ON");
	} else {
	fl_set_button(form_ue[UE_id]->button_0,0);
	fl_set_object_label(form_ue[UE_id]->button_0, "IA Receiver OFF");
	}*/
      fl_set_button(form_ue[UE_id]->button_0,0);
      fl_set_object_label(form_ue[UE_id]->button_0, "IA Receiver OFF");
    ret = pthread_create(&forms_thread, NULL, scope_thread, NULL);
    
    if (ret == 0)
      pthread_setname_np( forms_thread, "xforms" );
    
    printf("Scope thread created, ret=%d\n",ret);
  }
  
#endif
  
  printf("Sending sync to all threads (%p,%p,%p)\n",&sync_var,&sync_cond,&sync_mutex);

  
  pthread_mutex_lock(&sync_mutex);
  sync_var=0;
  pthread_cond_broadcast(&sync_cond);
  pthread_mutex_unlock(&sync_mutex);

  printf("sync sent\n");
/*
  printf("About to call end_configmodule() from %s() %s:%d\n", __FUNCTION__, __FILE__, __LINE__);
  end_configmodule();
  printf("Called end_configmodule() from %s() %s:%d\n", __FUNCTION__, __FILE__, __LINE__);
*/
  // wait for end of program
  printf("TYPE <CTRL-C> TO TERMINATE\n");
  //getchar();


#if defined(ENABLE_ITTI)
  printf("Entering ITTI signals handler\n");
  itti_wait_tasks_end();
  printf("Returned from ITTI signal handler\n");
  oai_exit=1;
  printf("oai_exit=%d\n",oai_exit);
#else

    while (oai_exit==0)
      rt_sleep_ns(100000000ULL);
    printf("Terminating application - oai_exit=%d\n",oai_exit);

#endif

  // stop threads
#ifdef XFORMS
  printf("waiting for XFORMS thread\n");

  if (do_forms==1) {
    pthread_join(forms_thread,&status);
    fl_hide_form(form_stats->stats_form);
    fl_free_form(form_stats->stats_form);
    fl_hide_form(form_ue[0]->lte_phy_scope_ue);
    fl_free_form(form_ue[0]->lte_phy_scope_ue);
  }

#endif

  printf("stopping MODEM threads\n");

  pthread_cond_destroy(&sync_cond);
  pthread_mutex_destroy(&sync_mutex);

  //  pthread_mutex_destroy(&ue_pf_po_mutex);

  // *** Handle per CC_id openair0
  if (PHY_vars_UE_g[0][0]->rfdevice.trx_end_func)
    PHY_vars_UE_g[0][0]->rfdevice.trx_end_func(&PHY_vars_UE_g[0][0]->rfdevice);
  
  if (opt_enabled == 1)
    terminate_opt();
  
  logClean();

  printf("Bye.\n");
  
  return 0;
}
