lte-softmodem.c 73.6 KB
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/*******************************************************************************

  Eurecom OpenAirInterface
  Copyright(c) 1999 - 2011 Eurecom

  This program is free software; you can redistribute it and/or modify it
  under the terms and conditions of the GNU General Public License,
  version 2, as published by the Free Software Foundation.

  This program is distributed in the hope it will be useful, but WITHOUT
  ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  more details.

  You should have received a copy of the GNU General Public License along with
  this program; if not, write to the Free Software Foundation, Inc.,
  51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.

  The full GNU General Public License is included in this distribution in
  the file called "COPYING".

  Contact Information
  Openair Admin: openair_admin@eurecom.fr
  Openair Tech : openair_tech@eurecom.fr
  Forums       : http://forums.eurecom.fsr/openairinterface
  Address      : Eurecom, 2229, route des crêtes, 06560 Valbonne Sophia Antipolis, France

*******************************************************************************/

/*! \file lte-softmodem.c
* \brief main program to control HW and scheduling
* \author R. Knopp, F. Kaltenberger
* \date 2012
* \version 0.1
* \company Eurecom
* \email: knopp@eurecom.fr,florian.kaltenberger@eurecom.fr
* \note
* \warning
*/
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <sys/ioctl.h>
#include <sys/types.h>
#include <sys/mman.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <sched.h>
#include <signal.h>
#include <execinfo.h>
#include <getopt.h>

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

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#include "assertions.h"
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#ifdef EMOS
#include <gps.h>
#endif

#include "PHY/types.h"
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#include "PHY/defs.h"
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#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

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#include "openair0_lib.h"
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#undef FRAME_LENGTH_COMPLEX_SAMPLES //there are two conflicting definitions, so we better make sure we don't use it at all
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#include "PHY/vars.h"
#include "MAC_INTERFACE/vars.h"
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//#include "SCHED/defs.h"
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#include "SCHED/vars.h"
#include "LAYER2/MAC/vars.h"

#include "../../SIMU/USER/init_lte.h"

#ifdef EMOS
#include "SCHED/phy_procedures_emos.h"
#endif

#ifdef OPENAIR2
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#include "otg_tx.h"
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#include "LAYER2/MAC/defs.h"
#include "LAYER2/MAC/vars.h"
#ifndef CELLULAR
#include "RRC/LITE/vars.h"
#endif
#include "PHY_INTERFACE/vars.h"
#endif

#ifdef SMBV
#include "PHY/TOOLS/smbv.h"
unsigned short config_frames[4] = {2,9,11,13};
#endif
#include "UTIL/LOG/log_extern.h"
#include "UTIL/OTG/otg.h"
#include "UTIL/OTG/otg_vars.h"
#include "UTIL/MATH/oml.h"
#include "UTIL/LOG/vcd_signal_dumper.h"
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#include "enb_config.h"
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#if defined(ENABLE_ITTI)
# include "intertask_interface_init.h"
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# include "create_tasks.h"
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# if defined(ENABLE_USE_MME)
#   include "s1ap_eNB.h"
# endif
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#endif

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

#define FRAME_PERIOD    100000000ULL
#define DAQ_PERIOD      66667ULL

#define MY_RF_MODE      (RXEN + TXEN + TXLPFNORM + TXLPFEN + TXLPF25 + RXLPFNORM + RXLPFEN + RXLPF25 + LNA1ON +LNAMax + RFBBNORM + DMAMODE_RX + DMAMODE_TX)
#define RF_MODE_BASE    (TXLPFNORM + TXLPFEN + TXLPF25 + RXLPFNORM + RXLPFEN + RXLPF25 + LNA1ON +LNAMax + RFBBNORM)

struct timing_info_t {
  //unsigned int frame, hw_slot, last_slot, next_slot;
  RTIME time_min, time_max, time_avg, time_last, time_now;
  //unsigned int mbox0, mbox1, mbox2, mbox_target;
  unsigned int n_samples;
} timing_info;

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extern int16_t* sync_corr_ue0;
extern int16_t prach_ifft[4][1024*2];
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int init_dlsch_threads(void);
void cleanup_dlsch_threads(void);
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int32_t init_rx_pdsch_thread(void);
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void cleanup_rx_pdsch_thread(void);
int init_ulsch_threads(void);
void cleanup_ulsch_threads(void);

void setup_ue_buffers(PHY_VARS_UE *phy_vars_ue, LTE_DL_FRAME_PARMS *frame_parms, int carrier);
void setup_eNB_buffers(PHY_VARS_eNB *phy_vars_eNB, LTE_DL_FRAME_PARMS *frame_parms, int carrier);
void test_config(int card, int ant, unsigned int rf_mode, int UE_flag);

#ifdef XFORMS
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// 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[NUMBER_OF_UE_MAX];
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FD_stats_form                  *form_stats=NULL;
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char title[255];
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unsigned char                   scope_enb_num_ue = 1;
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#endif //XFORMS

#ifdef RTAI
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static SEM                     *mutex;
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//static CND *cond;

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static int                      thread0;
static int                      thread1;
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//static int sync_thread;
#else
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pthread_t                       thread0;
pthread_t                       thread1;
pthread_attr_t                  attr_dlsch_threads;
struct sched_param              sched_param_dlsch;
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#endif

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#ifdef XFORMS
static pthread_t                thread2; //xforms
#endif
#ifdef EMOS
static pthread_t                thread3; //emos
#endif
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/*
static int instance_cnt=-1; //0 means worker is busy, -1 means its free
int instance_cnt_ptr_kern,*instance_cnt_ptr_user;
int pci_interface_ptr_kern;
*/
//extern unsigned int bigphys_top;
//extern unsigned int mem_base;

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int                             card = 0;
static exmimo_config_t         *p_exmimo_config;
static exmimo_id_t             *p_exmimo_id;
static volatile unsigned int   *DAQ_MBOX;
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#if defined(ENABLE_ITTI)
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static volatile int             start_eNB = 0;
static volatile int             start_UE = 0;
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#endif
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volatile int                    oai_exit = 0;

//static int                      time_offset[4] = {-138,-138,-138,-138};
//static int                      time_offset[4] = {-145,-145,-145,-145};
static int                      time_offset[4] = {0,0,0,0};

static int                      fs4_test=0;
static char                     UE_flag=0;
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static uint8_t                       eNB_id=0,UE_id=0;
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uint32_t                             carrier_freq[4] =           {1907600000,1907600000,1907600000,1907600000}; /* For UE! */
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static uint32_t          downlink_frequency[4] =     {1907600000,1907600000,1907600000,1907600000};
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static int32_t                      uplink_frequency_offset[4]= {-120000000,-120000000,-120000000,-120000000};
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static char                    *conf_config_file_name = NULL;

static char                    *itti_dump_file = NULL;

static char                     rxg_fname[100];
static char                     txg_fname[100];
static char                     rflo_fname[100];
static char                     rfdc_fname[100];
static FILE                    *rxg_fd=NULL;
static FILE                    *txg_fd=NULL;
static FILE                    *rflo_fd=NULL;
static FILE                    *rfdc_fd=NULL;
static unsigned int             rxg_max[4] =    {133,133,133,133};
static unsigned int             rxg_med[4] =    {127,127,127,127};
static unsigned int             rxg_byp[4] =    {120,120,120,120};
static int                      tx_max_power =  0;
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/*
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uint32_t rf_mode_max[4]     = {55759,55759,55759,55759};
uint32_t rf_mode_med[4]     = {39375,39375,39375,39375};
uint32_t rf_mode_byp[4]     = {22991,22991,22991,22991};
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*/
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static uint32_t                      rf_mode[4] =        {MY_RF_MODE,0,0,0};
static uint32_t                      rf_local[4] =       {8255000,8255000,8255000,8255000}; // UE zepto
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  //{8254617, 8254617, 8254617, 8254617}; //eNB khalifa
  //{8255067,8254810,8257340,8257340}; // eNB PETRONAS

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static uint32_t                      rf_vcocal[4] =      {910,910,910,910};
static uint32_t                      rf_vcocal_850[4] =  {2015, 2015, 2015, 2015};
static uint32_t                      rf_rxdc[4] =        {32896,32896,32896,32896};
static uint32_t                      rxgain[4] =         {20,20,20,20};
static uint32_t                      txgain[4] =         {20,20,20,20};
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static runmode_t                mode;
static int                      rx_input_level_dBm;
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static int                      online_log_messages=0;
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#ifdef XFORMS
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extern int                      otg_enabled;
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static char                     do_forms=0;
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#else
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int                             otg_enabled;
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#endif
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int                             number_of_cards =   1;
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static int                      mbox_bounds[20] =   {8,16,24,30,38,46,54,60,68,76,84,90,98,106,114,120,128,136,144, 0}; ///boundaries of slots in terms ob mbox counter rounded up to even numbers
//static int                      mbox_bounds[20] =   {6,14,22,28,36,44,52,58,66,74,82,88,96,104,112,118,126,134,142, 148}; ///boundaries of slots in terms ob mbox counter rounded up to even numbers
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static LTE_DL_FRAME_PARMS      *frame_parms;
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unsigned int build_rflocal(int txi, int txq, int rxi, int rxq)
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{
    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));
}

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#if !defined(ENABLE_ITTI)
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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 {
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    oai_exit = 1;
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  }
}
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#endif
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void exit_fun(const char* s)
{
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  if (s != NULL) {
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    printf("%s %s() Exiting: %s\n",__FILE__, __FUNCTION__, s);
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  }

  oai_exit = 1;

#if defined(ENABLE_ITTI)
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  itti_terminate_tasks (TASK_UNKNOWN);
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#endif
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  //rt_sleep_ns(FRAME_PERIOD);

  //exit (-1);
}

#ifdef XFORMS
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static void *scope_thread(void *arg) {
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    char stats_buffer[16384];
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# ifdef ENABLE_XFORMS_WRITE_STATS
    FILE *UE_stats, *eNB_stats;
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    int len = 0;
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# endif
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    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);
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    /*
      if (UE_flag==1) 
      UE_stats  = fopen("UE_stats.txt", "w");
      else 
      eNB_stats = fopen("eNB_stats.txt", "w");
    */
    
    while (!oai_exit) {
        if (UE_flag==1) {
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# ifdef ENABLE_XFORMS_WRITE_STATS
            len =
# endif
                    dump_ue_stats (PHY_vars_UE_g[0], stats_buffer, 0, mode,rx_input_level_dBm);
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            fl_set_object_label(form_stats->stats_text, stats_buffer);
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# ifdef ENABLE_XFORMS_WRITE_STATS
            rewind (UE_stats);
            fwrite (stats_buffer, 1, len, UE_stats);
# endif
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            phy_scope_UE(form_ue[UE_id], 
                         PHY_vars_UE_g[UE_id],
                         eNB_id,
                         UE_id,7);
            
        } else {
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# ifdef ENABLE_XFORMS_WRITE_STATS
            len =
# endif
                    dump_eNB_stats (PHY_vars_eNB_g[0], stats_buffer, 0);
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            fl_set_object_label(form_stats->stats_text, stats_buffer);
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# ifdef ENABLE_XFORMS_WRITE_STATS
            rewind (eNB_stats);
            fwrite (stats_buffer, 1, len, eNB_stats);
# endif
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            for(UE_id=0;UE_id<scope_enb_num_ue;UE_id++) {
                phy_scope_eNB(form_enb[UE_id], 
                              PHY_vars_eNB_g[eNB_id],
                              UE_id);
            }
              
        }
        //printf("doing forms\n");
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        usleep(100000); // 100 ms
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    }
    
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# ifdef ENABLE_XFORMS_WRITE_STATS
    fclose (UE_stats);
    fclose (eNB_stats);
# endif
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    pthread_exit((void*)arg);
}
#endif

int dummy_tx_buffer[3840*4] __attribute__((aligned(16)));

#ifdef EMOS
#define NO_ESTIMATES_DISK 100 //No. of estimates that are aquired before dumped to disk

void *emos_thread (void *arg)
{
  char c;
  char *fifo2file_buffer, *fifo2file_ptr;

  int fifo, counter=0, bytes;

  FILE  *dumpfile_id;
  char  dumpfile_name[1024];
  time_t starttime_tmp;
  struct tm starttime;
  
  int channel_buffer_size;
  
  time_t timer;
  struct tm *now;

  struct gps_data_t *gps_data = NULL;
  struct gps_fix_t dummy_gps_data;
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  struct sched_param sched_param;
  
  sched_param.sched_priority = sched_get_priority_max(SCHED_FIFO)-1; 
  sched_setscheduler(0, SCHED_FIFO,&sched_param);
  
  printf("EMOS thread has priority %d\n",sched_param.sched_priority);
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  timer = time(NULL);
  now = localtime(&timer);

  memset(&dummy_gps_data,1,sizeof(struct gps_fix_t));
  
  gps_data = gps_open("127.0.0.1","2947");
  if (gps_data == NULL) 
    {
      printf("[EMOS] Could not open GPS\n");
      //exit(-1);
    }
#if GPSD_API_MAJOR_VERSION>=4
  else if (gps_stream(gps_data, WATCH_ENABLE,NULL) != 0)
#else
  else if (gps_query(gps_data, "w+x") != 0)
#endif
    {
      //sprintf(tmptxt,"Error sending command to GPS, gps_data = %x", gps_data);
      printf("[EMOS] Error sending command to GPS\n");
      //exit(-1);
    }
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  else 
    printf("[EMOS] Opened GPS, gps_data=%p\n");
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  if (UE_flag==0)
    channel_buffer_size = sizeof(fifo_dump_emos_eNB);
  else
    channel_buffer_size = sizeof(fifo_dump_emos_UE);

  // allocate memory for NO_FRAMES_DISK channes estimations
  fifo2file_buffer = malloc(NO_ESTIMATES_DISK*channel_buffer_size);
  fifo2file_ptr = fifo2file_buffer;

  if (fifo2file_buffer == NULL)
    {
      printf("[EMOS] Cound not allocate memory for fifo2file_buffer\n");
      exit(EXIT_FAILURE);
    }

  if ((fifo = open(CHANSOUNDER_FIFO_DEV, O_RDONLY)) < 0)
    {
      fprintf(stderr, "[EMOS] Error opening the fifo\n");
      exit(EXIT_FAILURE);
    }


  time(&starttime_tmp);
  localtime_r(&starttime_tmp,&starttime);
  snprintf(dumpfile_name,1024,"/tmp/%s_data_%d%02d%02d_%02d%02d%02d.EMOS",
	   (UE_flag==0) ? "eNB" : "UE",
	   1900+starttime.tm_year, starttime.tm_mon+1, starttime.tm_mday, starttime.tm_hour, starttime.tm_min, starttime.tm_sec);

  dumpfile_id = fopen(dumpfile_name,"w");
  if (dumpfile_id == NULL)
    {
      fprintf(stderr, "[EMOS] Error opening dumpfile %s\n",dumpfile_name);
      exit(EXIT_FAILURE);
    }


  printf("[EMOS] starting dump, channel_buffer_size=%d ...\n",channel_buffer_size);
  while (!oai_exit)
    {
      bytes = rtf_read_timed(fifo, fifo2file_ptr, channel_buffer_size,100);
      if (bytes==0)
	continue;

      /*
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      if (UE_flag==0)
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	printf("eNB: count %d, frame %d, read: %d bytes from the fifo\n",counter, ((fifo_dump_emos_eNB*)fifo2file_ptr)->frame_tx,bytes);
      else
	printf("UE: count %d, frame %d, read: %d bytes from the fifo\n",counter, ((fifo_dump_emos_UE*)fifo2file_ptr)->frame_rx,bytes);
      */

      fifo2file_ptr += channel_buffer_size;
      counter ++;

      if (counter == NO_ESTIMATES_DISK)
        {
          //reset stuff
          fifo2file_ptr = fifo2file_buffer;
          counter = 0;

          //flush buffer to disk
	  if (UE_flag==0)
	    printf("[EMOS] eNB: count %d, frame %d, flushing buffer to disk\n",
		   counter, ((fifo_dump_emos_eNB*)fifo2file_ptr)->frame_tx);
	  else
	    printf("[EMOS] UE: count %d, frame %d, flushing buffer to disk\n",
		   counter, ((fifo_dump_emos_UE*)fifo2file_ptr)->frame_rx);


          if (fwrite(fifo2file_buffer, sizeof(char), NO_ESTIMATES_DISK*channel_buffer_size, dumpfile_id) != NO_ESTIMATES_DISK*channel_buffer_size)
            {
              fprintf(stderr, "[EMOS] Error writing to dumpfile\n");
              exit(EXIT_FAILURE);
            }
	  if (gps_data)
	    {
	      if (gps_poll(gps_data) != 0) {
		printf("[EMOS] problem polling data from gps\n");
	      }
	      else {
		printf("[EMOS] lat %g, lon %g\n",gps_data->fix.latitude,gps_data->fix.longitude);
	      }
	      if (fwrite(&(gps_data->fix), sizeof(char), sizeof(struct gps_fix_t), dumpfile_id) != sizeof(struct gps_fix_t))
		{
		  printf("[EMOS] Error writing to dumpfile, stopping recording\n");
		  exit(EXIT_FAILURE);
		}
	    }
	  else
	    {
	      printf("[EMOS] WARNING: No GPS data available, storing dummy packet\n");
	      if (fwrite(&(dummy_gps_data), sizeof(char), sizeof(struct gps_fix_t), dumpfile_id) != sizeof(struct gps_fix_t))
		{
		  printf("[EMOS] Error writing to dumpfile, stopping recording\n");
		  exit(EXIT_FAILURE);
		}
	    } 
        }
    }
  
  free(fifo2file_buffer);
  fclose(dumpfile_id);
  close(fifo);
  
  pthread_exit((void*) arg);

}
#endif

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#if defined(ENABLE_ITTI)
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static void wait_system_ready (char *message, volatile int *start_flag)
{
  /* Wait for eNB application initialization to be complete (eNB registration to MME) */
  {
    static char *indicator[] = {".    ", "..   ", "...  ", ".... ", ".....",
                                " ....", "  ...", "   ..", "    .", "     "};
    int i = 0;

    while ((!oai_exit) && (*start_flag == 0)) {
      LOG_N(EMU, message, indicator[i]);
      i = (i + 1) % (sizeof(indicator) / sizeof(indicator[0]));
      usleep(200000);
    }
    LOG_D(EMU,"\n");
  }
}
#endif

  #if defined(ENABLE_ITTI)
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void *l2l1_task(void *arg)
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{
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    MessageDef *message_p = NULL;
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    int         result;
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    itti_set_task_real_time(TASK_L2L1);
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    itti_mark_task_ready(TASK_L2L1);

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    if (UE_flag == 0) {
      /* Wait for the initialize message */
      do {
        if (message_p != NULL) {
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          result = itti_free (ITTI_MSG_ORIGIN_ID(message_p), message_p);
          AssertFatal (result == EXIT_SUCCESS, "Failed to free memory (%d)!\n", result);
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        }
        itti_receive_msg (TASK_L2L1, &message_p);
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        switch (ITTI_MSG_ID(message_p)) {
          case INITIALIZE_MESSAGE:
            /* Start eNB thread */
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            LOG_D(EMU, "L2L1 TASK received %s\n", ITTI_MSG_NAME(message_p));
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            start_eNB = 1;
            break;

          case TERMINATE_MESSAGE:
            oai_exit=1;
            itti_exit_task ();
            break;

          default:
            LOG_E(EMU, "Received unexpected message %s\n", ITTI_MSG_NAME(message_p));
            break;
        }
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      } while (ITTI_MSG_ID(message_p) != INITIALIZE_MESSAGE);
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      result = itti_free (ITTI_MSG_ORIGIN_ID(message_p), message_p);
      AssertFatal (result == EXIT_SUCCESS, "Failed to free memory (%d)!\n", result);
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    }

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    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;

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        case ACTIVATE_MESSAGE:
          start_UE = 1;
          break;

        case DEACTIVATE_MESSAGE:
          start_UE = 0;
          break;

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

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

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      result = itti_free (ITTI_MSG_ORIGIN_ID(message_p), message_p);
      AssertFatal (result == EXIT_SUCCESS, "Failed to free memory (%d)!\n", result);
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    } while(1);

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    return NULL;
}
#endif

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/* This is the main eNB thread. It gets woken up by the kernel driver using the RTAI message mechanism (rt_send and rt_receive). */
static void *eNB_thread(void *arg)
{
#ifdef RTAI
  RT_TASK *task;
#endif
  unsigned char slot=0,last_slot, next_slot;
  int hw_slot,frame=0;
  unsigned int aa,slot_offset, slot_offset_F;
  int diff;
  int delay_cnt;
  RTIME time_in, time_diff;
  int mbox_target=0,mbox_current=0;
  int i,ret;
  int tx_offset;

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#if defined(ENABLE_ITTI)
  /* Wait for eNB application initialization to be complete (eNB registration to MME) */
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  wait_system_ready ("Waiting for eNB application to be ready %s\r", &start_eNB);
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#endif

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#ifdef RTAI
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    task = rt_task_init_schmod(nam2num("TASK0"), 0, 0, 0, SCHED_FIFO, 0xF);
#endif

  if (!oai_exit) {
#ifdef RTAI
    LOG_D(HW,"Started eNB thread (id %p)\n",task);
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#endif

#ifdef HARD_RT
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    rt_make_hard_real_time();
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#endif

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    mlockall(MCL_CURRENT | MCL_FUTURE);
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    timing_info.time_min = 100000000ULL;
    timing_info.time_max = 0;
    timing_info.time_avg = 0;
    timing_info.n_samples = 0;
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    while (!oai_exit)
      {
        hw_slot = (((((volatile unsigned int *)DAQ_MBOX)[0]+1)%150)<<1)/15;
        //LOG_D(HW,"eNB frame %d, time %llu: slot %d, hw_slot %d (mbox %d)\n",frame,rt_get_time_ns(),slot,hw_slot,((unsigned int *)DAQ_MBOX)[0]);
        //this is the mbox counter where we should be
        //mbox_target = ((((slot+1)%20)*15+1)>>1)%150;
        mbox_target = mbox_bounds[slot];
        //this is the mbox counter where we are
        mbox_current = ((volatile unsigned int *)DAQ_MBOX)[0];
        //this is the time we need to sleep in order to synchronize with the hw (in multiples of DAQ_PERIOD)
        if ((mbox_current>=135) && (mbox_target<15)) //handle the frame wrap-arround
            diff = 150-mbox_current+mbox_target;
        else if ((mbox_current<15) && (mbox_target>=135))
            diff = -150+mbox_target-mbox_current;
        else
            diff = mbox_target - mbox_current;

        if (((slot%2==0) && (diff < (-14))) || ((slot%2==1) && (diff < (-7)))) {
          // at the eNB, even slots have double as much time since most of the processing is done here and almost nothing in odd slots
          LOG_D(HW,"eNB Frame %d, time %llu: missed slot, proceeding with next one (slot %d, hw_slot %d, diff %d)\n",frame, rt_get_time_ns(), slot, hw_slot, diff);
          slot++;
          if (frame > 0) {
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            exit_fun("[HW][eNB] missed slot");
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          }
          if (slot==20){
            slot=0;
            frame++;
          }
          continue;
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        }
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        if (diff>8)
            LOG_D(HW,"eNB Frame %d, time %llu: skipped slot, waiting for hw to catch up (slot %d, hw_slot %d, mbox_current %d, mbox_target %d, diff %d)\n",frame, rt_get_time_ns(), slot, hw_slot, mbox_current, mbox_target, diff);
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        delay_cnt = 0;
        while ((diff>0) && (!oai_exit))
          {
            time_in = rt_get_time_ns();
            //LOG_D(HW,"eNB Frame %d delaycnt %d : hw_slot %d (%d), slot %d, (slot+1)*15=%d, diff %d, time %llu\n",frame,delay_cnt,hw_slot,((unsigned int *)DAQ_MBOX)[0],slot,(((slot+1)*15)>>1),diff,time_in);
            //LOG_D(HW,"eNB Frame %d, time %llu: sleeping for %llu (slot %d, hw_slot %d, diff %d, mbox %d, delay_cnt %d)\n", frame, time_in, diff*DAQ_PERIOD,slot,hw_slot,diff,((volatile unsigned int *)DAQ_MBOX)[0],delay_cnt);
            ret = rt_sleep_ns(diff*DAQ_PERIOD);
            if (ret)
              LOG_D(HW,"eNB Frame %d, time %llu: rt_sleep_ns returned %d\n",frame, time_in);
            hw_slot = (((((volatile unsigned int *)DAQ_MBOX)[0]+1)%150)<<1)/15;
            //LOG_D(HW,"eNB Frame %d : hw_slot %d, time %llu\n",frame,hw_slot,rt_get_time_ns());
            delay_cnt++;
            if (delay_cnt == 10)
              {
                LOG_D(HW,"eNB Frame %d: HW stopped ... \n",frame);
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                exit_fun("[HW][eNB] HW stopped");
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              }
            mbox_current = ((volatile unsigned int *)DAQ_MBOX)[0];
            if ((mbox_current>=135) && (mbox_target<15)) //handle the frame wrap-arround
              diff = 150-mbox_current+mbox_target;
            else if ((mbox_current<15) && (mbox_target>=135))
              diff = -150+mbox_target-mbox_current;
            else
              diff = mbox_target - mbox_current;
          }
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        last_slot = (slot)%LTE_SLOTS_PER_FRAME;
        if (last_slot <0)
          last_slot+=20;
        next_slot = (slot+3)%LTE_SLOTS_PER_FRAME;
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        //PHY_vars_eNB_g[0]->frame = frame;
        if (frame>5)
          {
            /*
            if (frame%100==0)
              LOG_D(HW,"frame %d (%d), slot %d, hw_slot %d, next_slot %d (before): DAQ_MBOX %d\n",frame, PHY_vars_eNB_g[0]->frame, slot, hw_slot,next_slot,DAQ_MBOX[0]);
            */

            //if (PHY_vars_eNB_g[0]->frame>5) {
              timing_info.time_last = timing_info.time_now;
              timing_info.time_now = rt_get_time_ns();

              if (timing_info.n_samples>0) {
                time_diff = timing_info.time_now - timing_info.time_last;
                if (time_diff < timing_info.time_min)
                  timing_info.time_min = time_diff;
                if (time_diff > timing_info.time_max)
                  timing_info.time_max = time_diff;
                timing_info.time_avg += time_diff;
              }
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              timing_info.n_samples++;
              /*
              if ((timing_info.n_samples%2000)==0) {
                LOG_D(HW,"frame %d (%d), slot %d, hw_slot %d: diff=%llu, min=%llu, max=%llu, avg=%llu (n_samples %d)\n",
                      frame, PHY_vars_eNB_g[0]->frame, slot, hw_slot,time_diff,
                      timing_info.time_min,timing_info.time_max,timing_info.time_avg/timing_info.n_samples,timing_info.n_samples);
                timing_info.n_samples = 0;
                timing_info.time_avg = 0;
              }
              */
              //}
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            if (fs4_test==0)
              {
                phy_procedures_eNB_lte (last_slot, next_slot, PHY_vars_eNB_g[0], 0, no_relay,NULL);
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                slot_offset_F = (next_slot)*
                                (PHY_vars_eNB_g[0]->lte_frame_parms.ofdm_symbol_size)*
                                ((PHY_vars_eNB_g[0]->lte_frame_parms.Ncp==1) ? 6 : 7);
                slot_offset = (next_slot)*
                              (PHY_vars_eNB_g[0]->lte_frame_parms.samples_per_tti>>1);
                if ((subframe_select(&PHY_vars_eNB_g[0]->lte_frame_parms,next_slot>>1)==SF_DL)||
                    ((subframe_select(&PHY_vars_eNB_g[0]->lte_frame_parms,next_slot>>1)==SF_S)&&((next_slot&1)==0)))
                  {
                    //	  LOG_D(HW,"Frame %d: Generating slot %d\n",frame,next_slot);

                    for (aa=0; aa<PHY_vars_eNB_g[0]->lte_frame_parms.nb_antennas_tx; aa++)
                      {
                        if (PHY_vars_eNB_g[0]->lte_frame_parms.Ncp == 1)
                          {
                            PHY_ofdm_mod(&PHY_vars_eNB_g[0]->lte_eNB_common_vars.txdataF[0][aa][slot_offset_F],
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#ifdef BIT8_TX
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                                         &PHY_vars_eNB_g[0]->lte_eNB_common_vars.txdata[0][aa][slot_offset>>1],
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#else
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                                         dummy_tx_buffer,//&PHY_vars_eNB_g[0]->lte_eNB_common_vars.txdata[0][aa][slot_offset],
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#endif
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                                         PHY_vars_eNB_g[0]->lte_frame_parms.log2_symbol_size,
                                         6,
                                         PHY_vars_eNB_g[0]->lte_frame_parms.nb_prefix_samples,
                                         PHY_vars_eNB_g[0]->lte_frame_parms.twiddle_ifft,
                                         PHY_vars_eNB_g[0]->lte_frame_parms.rev,
                                         CYCLIC_PREFIX);
                          }
                        else
                          {
                            normal_prefix_mod(&PHY_vars_eNB_g[0]->lte_eNB_common_vars.txdataF[0][aa][slot_offset_F],
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                                              &PHY_vars_eNB_g[0]->lte_eNB_common_vars.txdata[0][aa][slot_offset>>1],
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#else
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                                              dummy_tx_buffer,//&PHY_vars_eNB_g[0]->lte_eNB_common_vars.txdata[0][aa][slot_offset],
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#endif
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                                              7,
                                              &(PHY_vars_eNB_g[0]->lte_frame_parms));
                          }
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#ifdef EXMIMO
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                        for (i=0; i<PHY_vars_eNB_g[0]->lte_frame_parms.samples_per_tti/2; i++)
                          {
                            tx_offset = (int)slot_offset+time_offset[aa]+i;
                            if (tx_offset<0)
                              tx_offset += LTE_NUMBER_OF_SUBFRAMES_PER_FRAME*PHY_vars_eNB_g[0]->lte_frame_parms.samples_per_tti;
                            if (tx_offset>=(LTE_NUMBER_OF_SUBFRAMES_PER_FRAME*PHY_vars_eNB_g[0]->lte_frame_parms.samples_per_tti))
                              tx_offset -= LTE_NUMBER_OF_SUBFRAMES_PER_FRAME*PHY_vars_eNB_g[0]->lte_frame_parms.samples_per_tti;
                            ((short*)&PHY_vars_eNB_g[0]->lte_eNB_common_vars.txdata[0][aa][tx_offset])[0]=
                              ((short*)dummy_tx_buffer)[2*i]<<4;
                            ((short*)&PHY_vars_eNB_g[0]->lte_eNB_common_vars.txdata[0][aa][tx_offset])[1]=
                              ((short*)dummy_tx_buffer)[2*i+1]<<4;
                          }
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#endif //EXMIMO
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                      }
                  }
              }
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#endif //IFFT_FPGA
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            /*
            if (frame%100==0)
              LOG_D(HW,"hw_slot %d (after): DAQ_MBOX %d\n",hw_slot,DAQ_MBOX[0]);
            */
          }
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        /*
        if ((slot%2000)<10)
        LOG_D(HW,"fun0: doing very hard work\n");
        */
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        slot++;
        if (slot==20) {
          slot=0;
          frame++;
        }
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#if defined(ENABLE_ITTI)
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        itti_update_lte_time(frame, slot);
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#endif
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      }
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      LOG_D(HW,"eNB_thread: finished, ran %d times.\n",frame);
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#ifdef HARD_RT
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      rt_make_soft_real_time();
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#endif
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  }
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  // clean task
#ifdef RTAI
  rt_task_delete(task);
#endif
  LOG_D(HW,"Task deleted. returning\n");
  return 0;
}

/* This is the main UE thread. Initially it is doing a periodic get_frame. One synchronized it gets woken up by the kernel driver using the RTAI message mechanism (rt_send and rt_receive). */
static void *UE_thread(void *arg)
{
#ifdef RTAI
  RT_TASK *task;
#endif
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  // RTIME in, out, diff;
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  int slot=0,frame=0,hw_slot,last_slot, next_slot;
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  // unsigned int aa;
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  static int is_synchronized = 0;
  int delay_cnt;
  RTIME time_in;
  int hw_slot_offset=0,rx_offset_mbox=0,mbox_target=0,mbox_current=0;
  int diff2;
  int i, ret;

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#if defined(ENABLE_ITTI) && defined(ENABLE_USE_MME)
  /* Wait for NAS UE to start cell selection */
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  wait_system_ready ("Waiting for UE to be activated by UserProcess %s\r", &start_UE);
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#endif

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#ifdef RTAI
  task = rt_task_init_schmod(nam2num("TASK0"), 0, 0, 0, SCHED_FIFO, 0xF);
  LOG_D(HW,"Started UE thread (id %p)\n",task);
#endif

#ifdef HARD_RT
  rt_make_hard_real_time();
#endif

  mlockall(MCL_CURRENT | MCL_FUTURE);

  openair_daq_vars.freq_offset = 0; //-7500;
  /*
  if (mode == rx_calib_ue) {
    openair_daq_vars.freq_offset = -7500;
    for (i=0; i<4; i++) {
        p_exmimo_config->rf.rf_freq_rx[i] = p_exmimo_config->rf.rf_freq_rx[i]+openair_daq_vars.freq_offset;
        p_exmimo_config->rf.rf_freq_tx[i] = p_exmimo_config->rf.rf_freq_rx[i]+openair_daq_vars.freq_offset;
    }
    openair0_dump_config(card);
  }
  */
  while (!oai_exit)
    {
      hw_slot = (((((volatile unsigned int *)DAQ_MBOX)[0]+1)%150)<<1)/15; //the slot the hw is about to store
      
      if (is_synchronized) {
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        //this is the mbox counter that indicates the start of the frame
        rx_offset_mbox = (PHY_vars_UE_g[0]->rx_offset * 150) / (10*PHY_vars_UE_g[0]->lte_frame_parms.samples_per_tti);
        //this is the mbox counter where we should be
        mbox_target = (((((slot+1)%20)*15+1)>>1) + rx_offset_mbox + 1)%150;
        // round up to the next multiple of two (mbox counter from express MIMO gives only even numbers)
        mbox_target = ((mbox_target+1)-((mbox_target-1)%2))%150;
        //this is the mbox counter where we are
        mbox_current = ((volatile unsigned int *)DAQ_MBOX)[0];
        //this is the time we need to sleep in order to synchronize with the hw (in multiples of DAQ_PERIOD)
        if ((mbox_current>=120) && (mbox_target<30)) //handle the frame wrap-arround
          diff2 = 150-mbox_current+mbox_target;
        else if ((mbox_current<30) && (mbox_target>=120))
          diff2 = -150+mbox_target-mbox_current;
        else
          diff2 = mbox_target - mbox_current;

        if (diff2 <(-7)) {
          LOG_D(HW,"UE Frame %d: missed slot, proceeding with next one (slot %d, hw_slot %d, diff %d)\n",frame, slot, hw_slot, diff2);
          if (frame>0)
            exit_fun("[HW][UE] missed slot");
          slot++;
          if (slot==20) {
            slot=0;
            frame++;
          }
          continue;
        }
        if (diff2>8)
          LOG_D(HW,"UE Frame %d: skipped slot, waiting for hw to catch up (slot %d, hw_slot %d, mbox_current %d, mbox_target %d, diff %d)\n",frame, slot, hw_slot, mbox_current, mbox_target, diff2);

        /*
          if (frame%100==0)
          LOG_D(HW,"frame %d (%d), slot %d, hw_slot %d, rx_offset_mbox %d, mbox_target %d, mbox_current %d, diff %d\n",frame, PHY_vars_UE_g[0]->frame, slot,hw_slot,rx_offset_mbox,mbox_target,mbox_current,diff2);
        */
        vcd_signal_dumper_dump_variable_by_name(VCD_SIGNAL_DUMPER_VARIABLES_DAQ_MBOX, *((volatile unsigned int *) openair0_exmimo_pci[card].rxcnt_ptr[0]));
        vcd_signal_dumper_dump_variable_by_name(VCD_SIGNAL_DUMPER_VARIABLES_DIFF, diff2);

        delay_cnt = 0;
        while ((diff2>0) && (!oai_exit) && (is_synchronized) )
          {
            time_in = rt_get_time_ns();
            //LOG_D(HW,"eNB Frame %d delaycnt %d : hw_slot %d (%d), slot %d (%d), diff %d, time %llu\n",frame,delay_cnt,hw_slot,((volatile unsigned int *)DAQ_MBOX)[0],slot,mbox_target,diff2,time_in);
            vcd_signal_dumper_dump_function_by_name(VCD_SIGNAL_DUMPER_FUNCTIONS_RT_SLEEP,1);
            ret = rt_sleep_ns(diff2*DAQ_PERIOD);
            vcd_signal_dumper_dump_function_by_name(VCD_SIGNAL_DUMPER_FUNCTIONS_RT_SLEEP,0);
            if (ret)
              LOG_D(HW,"eNB Frame %d, time %llu: rt_sleep_ns returned %d\n",frame, time_in);

            hw_slot = (((((volatile unsigned int *)DAQ_MBOX)[0]+1)%150)<<1)/15;
            //LOG_D(HW,"eNB Frame %d : hw_slot %d, time %llu\n",frame,hw_slot,rt_get_time_ns());
            delay_cnt++;
            if (delay_cnt == 30)
              {
                LOG_D(HW,"UE frame %d: HW stopped ... \n",frame);
                exit_fun("[HW][UE] HW stopped");
              }
            mbox_current = ((volatile unsigned int *)DAQ_MBOX)[0];
            if ((mbox_current>=135) && (mbox_target<15)) //handle the frame wrap-arround
              diff2 = 150-mbox_current+mbox_target;
            else if ((mbox_current<15) && (mbox_target>=135))
              diff2 = -150+mbox_target-mbox_current;
            else
              diff2 = mbox_target - mbox_current;

            vcd_signal_dumper_dump_variable_by_name(VCD_SIGNAL_DUMPER_VARIABLES_DAQ_MBOX, *((volatile unsigned int *) openair0_exmimo_pci[card].rxcnt_ptr[0]));
            vcd_signal_dumper_dump_variable_by_name(VCD_SIGNAL_DUMPER_VARIABLES_DIFF, diff2);
          }
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984
985
986
987
988
989
990
991
	
      }

      last_slot = (slot)%LTE_SLOTS_PER_FRAME;
      if (last_slot <0)
        last_slot+=LTE_SLOTS_PER_FRAME;
      next_slot = (slot+3)%LTE_SLOTS_PER_FRAME;

      if (is_synchronized)
        {

	  /*
          if (frame%100==0)
            LOG_D(HW,"frame %d (%d), slot %d, hw_slot %d, last_slot %d (before): DAQ_MBOX %d\n",frame, PHY_vars_UE_g[0]->frame, slot,hw_slot,last_slot,DAQ_MBOX[0]);
	  */

992
          // in = rt_get_time_ns();
993
          phy_procedures_UE_lte (last_slot, next_slot, PHY_vars_UE_g[0], 0, 0,mode,0,NULL);
994
995
          // out = rt_get_time_ns();
          // diff = out-in;
996
997
998
999
1000

	  /*
          if (frame % 100 == 0)
            LOG_D(HW,"hw_slot %d (after): DAQ_MBOX %d\n",hw_slot,DAQ_MBOX[0]);
	  
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