eNB_transport_IQ.c 31.5 KB
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/*******************************************************************************
    OpenAirInterface
    Copyright(c) 1999 - 2014 Eurecom

    OpenAirInterface is free software: you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation, either version 3 of the License, or
    (at your option) any later version.


    OpenAirInterface 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 General Public License for more details.

    You should have received a copy of the GNU General Public License
    along with OpenAirInterface.The full GNU General Public License is
    included in this distribution in the file called "COPYING". If not,
    see <http://www.gnu.org/licenses/>.

   Contact Information
   OpenAirInterface Admin: openair_admin@eurecom.fr
   OpenAirInterface Tech : openair_tech@eurecom.fr
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   OpenAirInterface Dev  : openair4g-devel@lists.eurecom.fr
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   Address      : Eurecom, Campus SophiaTech, 450 Route des Chappes, CS 50193 - 06904 Biot Sophia Antipolis cedex, FRANCE

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

/*! \file eNB_transport_IQ.c
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 * \brief eNB transport IQ samples 
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 * \author  Katerina Trilyraki, Navid Nikaein, Raymond Knopp
 * \date 2015
 * \version 0.1
 * \company Eurecom
 * \maintainer:  navid.nikaein@eurecom.fr
 * \note
 * \warning very experimental 
 */
#include <unistd.h>
#include <time.h>
#include <pthread.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <signal.h>

#include "common_lib.h"
#include "PHY/defs.h"
#include "rrh_gw.h"
#include "rrh_gw_externs.h"
#include "rt_wrapper.h"

#define PRINTF_PERIOD    3750
#define HEADER_SIZE      ((sizeof(int32_t) + sizeof(openair0_timestamp))>>2)

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pthread_cond_t          sync_eNB_cond[4];
pthread_mutex_t         sync_eNB_mutex[4];
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pthread_mutex_t         sync_trx_mutex=PTHREAD_MUTEX_INITIALIZER;
pthread_cond_t          sync_trx_cond=PTHREAD_COND_INITIALIZER;

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openair0_timestamp 	nrt_eNB_counter[4]= {0,0,0,0};
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int32_t 	overflow_rx_buffer_eNB[4]= {0,0,0,0};
int32_t 	nsamps_eNB[4]= {0,0,0,0};
int32_t 	eNB_tx_started=0,eNB_rx_started=0;
int32_t 	counter_eNB_rx[4]= {0,0,0,0};
int32_t 	counter_eNB_tx[4]= {0,0,0,0};
uint8_t		RT_flag_eNB,NRT_flag_eNB;
void 		*rrh_eNB_thread_status;
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int 	        sync_eNB_rx[4]= {-1,-1,-1,-1};
unsigned int    sync_trx=0;

int32_t		**tx_buffer_eNB;
int32_t         **rx_buffer_eNB;
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void 		**rx_eNB; //was fixed to 2 ant
void 		**tx_eNB; //was fixed to 2 ant

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openair0_timestamp	timestamp_eNB_tx[4]= {0,0,0,0};// all antennas must have the same ts
openair0_timestamp      timestamp_eNB_rx[4]= {0,0,0,0};
openair0_timestamp	timestamp_rx=0,timestamp_tx=0;
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unsigned int   rx_pos=0, next_rx_pos=0;
unsigned int   tx_pos=0, tx_pos_rf=0, prev_tx_pos=0;
unsigned int   rt_period=0;
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struct itimerspec       timerspec;
pthread_mutex_t         timer_mutex;
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/*! \fn void *rrh_eNB_rx_thread(void *arg)
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 * \brief this function
 * \param[in]
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 * \return none
 * \note
 * @ingroup  _oai
 */
void *rrh_eNB_rx_thread(void *);
/*! \fn void *rrh_eNB_tx_thread(void *arg)
 * \brief this function
 * \param[in]
 * \return none
 * \note
 * @ingroup  _oai
 */
void *rrh_eNB_tx_thread(void *);
/*! \fn void *rrh_eNB_thread(void *arg)
 * \brief this function
 * \param[in]
 * \return none
 * \note
 * @ingroup  _oai
 */
void *rrh_eNB_thread(void *);
/*! \fn  void check_dev_config( rrh_module_t *mod_enb)
 * \brief this function
 * \param[in] *mod_enb
 * \return none
 * \note
 * @ingroup  _oai
 */
static void check_dev_config( rrh_module_t *mod_enb);
/*! \fn void calc_rt_period_ns( openair0_config_t openair0_cfg)
 * \brief this function
 * \param[in] openair0_cfg
 * \return none
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 * \note
 * @ingroup  _oai
 */
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static void calc_rt_period_ns( openair0_config_t openair0_cfg);



void config_BBU_mod( rrh_module_t *mod_enb, uint8_t RT_flag, uint8_t NRT_flag) {
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  int 	             error_code_eNB;
  pthread_t	     main_rrh_eNB_thread;
  pthread_attr_t     attr;
  struct sched_param sched_param_rrh;
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  RT_flag_eNB=RT_flag;
  NRT_flag_eNB=NRT_flag;
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  /* init socket and have handshake-like msg with client to exchange parameters */
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  mod_enb->eth_dev.trx_start_func(&mod_enb->eth_dev);//change port  make it plus_id
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  if (1==0) {
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 /* if a RF iterface is added to RRH module get the  configuration parameters sent from eNB  */
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if (mod_enb->devs->type != NONE_DEV ) {  
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    memcpy((void*)&mod_enb->devs->openair0_cfg,(void *)&mod_enb->eth_dev.openair0_cfg,sizeof(openair0_config_t));
    
    /* certain parameters have to be updated (calibration related)*/
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    if ( mod_enb->devs->type == EXMIMO_DEV ) {
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      if ( mod_enb->devs->openair0_cfg.num_rb_dl == 100 ) {
	mod_enb->devs->openair0_cfg.samples_per_packet = 2048;
	mod_enb->devs->openair0_cfg.tx_forward_nsamps = 175;
	mod_enb->devs->openair0_cfg.tx_delay = 8;
      }
      else if ( mod_enb->devs->openair0_cfg.num_rb_dl == 50 ) {
	mod_enb->devs->openair0_cfg.samples_per_packet = 2048;
	mod_enb->devs->openair0_cfg.tx_forward_nsamps = 95;
	mod_enb->devs->openair0_cfg.tx_delay = 5;
      }
      else if ( mod_enb->devs->openair0_cfg.num_rb_dl == 25 ) {
	mod_enb->devs->openair0_cfg.samples_per_packet = 1024;
	mod_enb->devs->openair0_cfg.tx_forward_nsamps = 70;
	mod_enb->devs->openair0_cfg.tx_delay = 6;
      }
      else if ( mod_enb->devs->openair0_cfg.num_rb_dl == 6 ) {
	mod_enb->devs->openair0_cfg.samples_per_packet = 256;
	mod_enb->devs->openair0_cfg.tx_forward_nsamps = 40;
	mod_enb->devs->openair0_cfg.tx_delay = 8;
      }
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    }
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    else if ((mod_enb->devs->type == USRP_B200_IF )||(mod_enb->devs->type == USRP_X300_IF )) {
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      if ( mod_enb->devs->openair0_cfg.num_rb_dl == 100 ) {
	mod_enb->devs->openair0_cfg.samples_per_packet = 2048;
	mod_enb->devs->openair0_cfg.tx_forward_nsamps = 175;
	mod_enb->devs->openair0_cfg.tx_delay = 8;
      }
      else if ( mod_enb->devs->openair0_cfg.num_rb_dl == 50 ) {
	mod_enb->devs->openair0_cfg.samples_per_packet = 2048;
	mod_enb->devs->openair0_cfg.tx_forward_nsamps = 95;
	mod_enb->devs->openair0_cfg.tx_delay = 5;
      }
      else if ( mod_enb->devs->openair0_cfg.num_rb_dl == 25 ) {
	mod_enb->devs->openair0_cfg.samples_per_packet = 1024;
	mod_enb->devs->openair0_cfg.tx_forward_nsamps = 70;
	mod_enb->devs->openair0_cfg.tx_delay = 6;
      }
      else if ( mod_enb->devs->openair0_cfg.num_rb_dl == 6 ) {
	mod_enb->devs->openair0_cfg.samples_per_packet = 256;
	mod_enb->devs->openair0_cfg.tx_forward_nsamps = 40;
	mod_enb->devs->openair0_cfg.tx_delay = 8;
      }
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    }
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    else if(mod_enb->devs->type == BLADERF_DEV) {
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      if ( mod_enb->devs->openair0_cfg.num_rb_dl == 100 ) {
	mod_enb->devs->openair0_cfg.samples_per_packet = 2048;
	mod_enb->devs->openair0_cfg.tx_forward_nsamps = 175;
	mod_enb->devs->openair0_cfg.tx_delay = 8;
      }
      else if ( mod_enb->devs->openair0_cfg.num_rb_dl == 50 ) {
	mod_enb->devs->openair0_cfg.samples_per_packet = 2048;
	mod_enb->devs->openair0_cfg.tx_forward_nsamps = 95;
	mod_enb->devs->openair0_cfg.tx_delay = 5;
      }
      else if ( mod_enb->devs->openair0_cfg.num_rb_dl == 25 ) {
	mod_enb->devs->openair0_cfg.samples_per_packet = 1024;
	mod_enb->devs->openair0_cfg.tx_forward_nsamps = 70;
	mod_enb->devs->openair0_cfg.tx_delay = 6;
      }
      else if ( mod_enb->devs->openair0_cfg.num_rb_dl == 6 ) {
	mod_enb->devs->openair0_cfg.samples_per_packet = 256;
	mod_enb->devs->openair0_cfg.tx_forward_nsamps = 40;
	mod_enb->devs->openair0_cfg.tx_delay = 8;
      }           
    }  
    
    /* check sanity of configuration parameters and print */
    check_dev_config(mod_enb);    
    
    /* initialize and configure the RF device */
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    if (openair0_device_load(mod_enb->devs, &mod_enb->devs->openair0_cfg)<0) {
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      LOG_E(RRH,"Exiting, cannot initialize RF device.\n");
      exit(-1);
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    } else {
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      LOG_I(RRH,"RF device has been successfully initialized.\n");
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    }  
 
  }
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    } else {
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    memcpy((void*)&mod_enb->devs->openair0_cfg,(void *)&mod_enb->eth_dev.openair0_cfg,sizeof(openair0_config_t));
    
    /* check sanity of configuration parameters and print */
    check_dev_config(mod_enb);    
    
    /* initialize and configure the RF device */
    if (openair0_device_load(mod_enb->devs, &mod_enb->devs->openair0_cfg)<0){
      LOG_E(RRH,"Exiting, cannot initialize RF device.\n");
      exit(-1);
    } else {
      if (mod_enb->devs->type != NONE_DEV) {
	/* start RF device */
	if (mod_enb->devs->type == EXMIMO_DEV) {
	  //call start function for exmino
	} else {
	  if (mod_enb->devs->trx_start_func(mod_enb->devs)!=0)
	    LOG_E(RRH,"Unable to initiate RF device.\n");
	  else
	    LOG_I(RRH,"RF device has been initiated.\n");
	}
	
      }
    }  
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  }
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  /* create main eNB module thread
     main_rrh_eNB_thread allocates memory 
     for TX/RX buffers and creates TX/RX
     threads for every eNB module */ 
  pthread_attr_init(&attr);
  sched_param_rrh.sched_priority = sched_get_priority_max(SCHED_FIFO);
  pthread_attr_setschedparam(&attr,&sched_param_rrh);
  pthread_attr_setschedpolicy(&attr,SCHED_FIFO);
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  error_code_eNB = pthread_create(&main_rrh_eNB_thread, &attr, rrh_eNB_thread, (void *)mod_enb);
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  if (error_code_eNB) {
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    LOG_E(RRH,"Error while creating eNB thread\n");
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    exit(-1);
  }
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}

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void *rrh_eNB_thread(void *arg) {

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  rrh_module_t 	       	*dev=(rrh_module_t *)arg;
  pthread_t  	      	eNB_rx_thread, eNB_tx_thread;  
  int 	      		error_code_eNB_rx, error_code_eNB_tx;
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  int32_t	        i,j;   		
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  void 			*tmp;
  unsigned int          samples_per_frame=0;
  
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  samples_per_frame = dev->eth_dev.openair0_cfg.samples_per_frame;    

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  while (rrh_exit==0) {
    
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    VCD_SIGNAL_DUMPER_DUMP_FUNCTION_BY_NAME( VCD_SIGNAL_DUMPER_FUNCTIONS_eNB_TRX, 1 );    
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    /* calculate packet period */
    calc_rt_period_ns(dev->eth_dev.openair0_cfg);
        
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    /* allocate memory for TX/RX buffers
       each antenna port has a TX and a RX buffer
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       each TX and RX buffer is of (samples_per_frame + HEADER_SIZE) samples (size of samples is 4 bytes) */
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    rx_buffer_eNB = (int32_t**)malloc16(dev->eth_dev.openair0_cfg.rx_num_channels*sizeof(int32_t*));
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    tx_buffer_eNB = (int32_t**)malloc16(dev->eth_dev.openair0_cfg.tx_num_channels*sizeof(int32_t*));    
    LOG_D(RRH,"rx_buffer_eNB address =%p tx_buffer_eNB address =%p  \n",rx_buffer_eNB,tx_buffer_eNB);
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    /* rx_buffer_eNB points to the beginning of data */
    for (i=0; i<dev->eth_dev.openair0_cfg.rx_num_channels; i++) {
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      tmp=(void *)malloc16(sizeof(int32_t)*(samples_per_frame + 32));
      memset(tmp,0,sizeof(int32_t)*(samples_per_frame + 32));
      rx_buffer_eNB[i]=( tmp + (32*sizeof(int32_t)) );  
      LOG_D(RRH,"i=%d rx_buffer_eNB[i]=%p tmp= %p\n",i,rx_buffer_eNB[i],tmp);
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    }
    /* tx_buffer_eNB points to the beginning of data */
    for (i=0; i<dev->eth_dev.openair0_cfg.tx_num_channels; i++) {
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      tmp=(void *)malloc16(sizeof(int32_t)*(samples_per_frame + 32));
      memset(tmp,0,sizeof(int32_t)*(samples_per_frame + 32));
      tx_buffer_eNB[i]=( tmp + (32*sizeof(int32_t)) );  
      LOG_D(RRH,"i= %d tx_buffer_eNB[i]=%p tmp= %p \n",i,tx_buffer_eNB[i],tmp);
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    }
    /* dummy initialization for TX/RX buffers */
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    for (i=0; i<dev->eth_dev.openair0_cfg.rx_num_channels; i++) {
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      for (j=0; j<samples_per_frame; j++) {
	rx_buffer_eNB[i][j]=32+i; 
      } 
    }
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    /* dummy initialization for TX/RX buffers */
    for (i=0; i<dev->eth_dev.openair0_cfg.tx_num_channels; i++) {
      for (j=0; j<samples_per_frame; j++) {
	tx_buffer_eNB[i][j]=12+i; 
      } 
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    }    
    /* allocate TX/RX buffers pointers used in write/read operations */
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    rx_eNB = (void**)malloc16(dev->eth_dev.openair0_cfg.rx_num_channels*sizeof(int32_t*));
    tx_eNB = (void**)malloc16(dev->eth_dev.openair0_cfg.tx_num_channels*sizeof(int32_t*));
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    /* init mutexes */    
    for (i=0; i<dev->eth_dev.openair0_cfg.tx_num_channels; i++) {
      pthread_mutex_init(&sync_eNB_mutex[i],NULL);
      pthread_cond_init(&sync_eNB_cond[i],NULL);
    }
    /* init mutexes */    
    pthread_mutex_init(&sync_trx_mutex,NULL);

    /* create eNB module's TX/RX threads */    
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#ifdef LOWLATENCY
    error_code_eNB_rx = pthread_create(&eNB_rx_thread, NULL, rrh_eNB_rx_thread, (void *)dev);
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    error_code_eNB_tx = pthread_create(&eNB_tx_thread, NULL, rrh_eNB_tx_thread, (void *)dev);
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    LOG_I(RRH,"[eNB][SCHED] deadline scheduling applied to eNB TX/RX threads\n");	
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#else
    pthread_attr_t	attr_eNB_rx, attr_eNB_tx;
    struct sched_param 	sched_param_eNB_rx, sched_param_eNB_tx;
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    pthread_attr_init(&attr_eNB_rx);
    pthread_attr_init(&attr_eNB_tx);	
    sched_param_eNB_rx.sched_priority = sched_get_priority_max(SCHED_FIFO);
    sched_param_eNB_tx.sched_priority = sched_get_priority_max(SCHED_FIFO);
    pthread_attr_setschedparam(&attr_eNB_rx,&sched_param_eNB_rx);
    pthread_attr_setschedparam(&attr_eNB_tx,&sched_param_eNB_tx);
    pthread_attr_setschedpolicy(&attr_eNB_rx,SCHED_FIFO);
    pthread_attr_setschedpolicy(&attr_eNB_tx,SCHED_FIFO);
    
    error_code_eNB_rx = pthread_create(&eNB_rx_thread, &attr_eNB_rx, rrh_eNB_rx_thread, (void *)dev);
    error_code_eNB_tx = pthread_create(&eNB_tx_thread, &attr_eNB_tx, rrh_eNB_tx_thread, (void *)dev);
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    LOG_I(RRH,"[eNB][SCHED] FIFO scheduling applied to eNB TX/RX threads\n");		
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#endif

    if (error_code_eNB_rx) {
      LOG_E(RRH,"[eNB] Error while creating eNB RX thread\n");
      exit(-1);
    }
    if (error_code_eNB_tx) {
      LOG_E(RRH,"[eNB] Error while creating eNB TX thread\n");
      exit(-1);
    }
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    /* create timer thread; when no RF device is present a software clock is generated */    
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    if (dev->devs->type == NONE_DEV) {
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      int 			error_code_timer;
      pthread_t 		main_timer_proc_thread;
      
      LOG_I(RRH,"Creating timer thread with rt period  %d ns.\n",rt_period);
      
      /* setup the timer to generate an interrupt:
	 -for the first time in (sample_per_packet/sample_rate) ns
	 -and then every (sample_per_packet/sample_rate) ns */
      timerspec.it_value.tv_sec =     rt_period/1000000000;
      timerspec.it_value.tv_nsec =    rt_period%1000000000;
      timerspec.it_interval.tv_sec =  rt_period/1000000000;
      timerspec.it_interval.tv_nsec = rt_period%1000000000;
      
      
#ifdef LOWLATENCY
      error_code_timer = pthread_create(&main_timer_proc_thread, NULL, timer_proc, (void *)&timerspec);
      LOG_I(RRH,"[eNB][SCHED] deadline scheduling applied to timer thread \n");
#else 
      pthread_attr_t attr_timer;
      struct sched_param sched_param_timer;
      
      pthread_attr_init(&attr_timer);
      sched_param_timer.sched_priority = sched_get_priority_max(SCHED_FIFO-1);
      pthread_attr_setschedparam(&attr_timer,&sched_param_timer);
      pthread_attr_setschedpolicy(&attr_timer,SCHED_FIFO-1);
      
      pthread_mutex_init(&timer_mutex,NULL);
      
      error_code_timer = pthread_create(&main_timer_proc_thread, &attr_timer, timer_proc, (void *)&timerspec);
      LOG_I(RRH,"[eNB][SCHED] FIFO scheduling applied to timer thread \n");   	
#endif	
      
      if (error_code_timer) {
	LOG_E(RRH,"Error while creating timer proc thread\n");
	exit(-1);
      }
      
    }
    
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    while (rrh_exit==0)
      sleep(1);
    
    VCD_SIGNAL_DUMPER_DUMP_FUNCTION_BY_NAME( VCD_SIGNAL_DUMPER_FUNCTIONS_eNB_TRX,0 );
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  }  
  
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  rrh_eNB_thread_status = 0;
  pthread_exit(&rrh_eNB_thread_status);
  return(0);
}

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/* Receive from RF and transmit to RRH */
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void *rrh_eNB_rx_thread(void *arg) {
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  /* measurement related vars */
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  struct timespec time0,time1,time2;
  unsigned long long max_rx_time=0, min_rx_time=rt_period, total_rx_time=0, average_rx_time=rt_period, s_period=0, trial=0;
  int trace_cnt=0;

  struct timespec time_req_1us, time_rem_1us;
  rrh_module_t *dev = (rrh_module_t *)arg;
  ssize_t bytes_sent;
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  int i=0 ,pck_rx=0, s_cnt=0;
  openair0_timestamp last_hw_counter=0;  //volatile int64_t
  unsigned int samples_per_frame=0,samples_per_subframe=0, spp_rf=0, spp_eth=0;
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  uint8_t loopback=0,measurements=0;
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  unsigned int subframe=0;
  unsigned int frame=0;
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  time_req_1us.tv_sec = 0;
  time_req_1us.tv_nsec =1000;  //time_req_1us.tv_nsec = (int)rt_period/2;--->granularity issue
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  spp_eth =  dev->eth_dev.openair0_cfg.samples_per_packet;
  spp_rf  =  dev->devs->openair0_cfg.samples_per_packet;

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  samples_per_frame = dev->eth_dev.openair0_cfg.samples_per_frame;
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  samples_per_subframe = (unsigned int)samples_per_frame/10;
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  loopback = dev->loopback;
  measurements = dev->measurements;
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  next_rx_pos = spp_eth;
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#ifdef LOWLATENCY
  struct sched_attr attr;
  unsigned int flags = 0;

  attr.size = sizeof(attr);
  attr.sched_flags = 0;
  attr.sched_nice = 0;
  attr.sched_priority = 0;

  attr.sched_policy   = SCHED_DEADLINE;
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  attr.sched_runtime  = (0.8 * 100) * 10000;//4 * 10000;
  attr.sched_deadline = (0.9 * 100) * 10000;//rt_period-2000;
  attr.sched_period   = 1 * 1000000;//rt_period;
  
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  if (sched_setattr(0, &attr, flags) < 0 ) {
    perror("[SCHED] eNB RX thread: sched_setattr failed (run with sudo)\n");
    exit(-1);
  }
#endif

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  while (rrh_exit == 0) {    
    while (rx_pos <(1 + subframe)*samples_per_subframe) {
      LOG_D(RRH,"starting a new send:%d  %d\n",sync_trx,frame);
      VCD_SIGNAL_DUMPER_DUMP_FUNCTION_BY_NAME( VCD_SIGNAL_DUMPER_FUNCTIONS_eNB_RX, 1 );
      VCD_SIGNAL_DUMPER_DUMP_VARIABLE_BY_NAME( VCD_SIGNAL_DUMPER_VARIABLES_HW_FRAME_RX, frame);
      VCD_SIGNAL_DUMPER_DUMP_VARIABLE_BY_NAME( VCD_SIGNAL_DUMPER_VARIABLES_HW_SUBFRAME_RX, subframe );  
      VCD_SIGNAL_DUMPER_DUMP_VARIABLE_BY_NAME( VCD_SIGNAL_DUMPER_VARIABLES_RX_PCK, pck_rx );
      LOG_D(RRH,"pack=%d    rx_pos=%d    subframe=%d frame=%d\n ",pck_rx, rx_pos, subframe,frame);
      
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      if (dev->devs->type == NONE_DEV) {	
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	VCD_SIGNAL_DUMPER_DUMP_VARIABLE_BY_NAME( VCD_SIGNAL_DUMPER_VARIABLES_RX_HWCNT, hw_counter );
	VCD_SIGNAL_DUMPER_DUMP_VARIABLE_BY_NAME( VCD_SIGNAL_DUMPER_VARIABLES_RX_LHWCNT, last_hw_counter );
	VCD_SIGNAL_DUMPER_DUMP_VARIABLE_BY_NAME( VCD_SIGNAL_DUMPER_VARIABLES_CNT, s_cnt );
	if (!eNB_rx_started) {
	  eNB_rx_started=1; // set this flag to 1 to indicate that eNB started
	  if (RT_flag_eNB==1) {
	    last_hw_counter=hw_counter;//get current counter
	  }
	} else {
	  if (RT_flag_eNB==1) {
	    if (hw_counter > last_hw_counter+1) {
	      printf("LR");
	    } else {
	      while ((hw_counter < last_hw_counter+1)) {
		VCD_SIGNAL_DUMPER_DUMP_FUNCTION_BY_NAME( VCD_SIGNAL_DUMPER_FUNCTIONS_eNB_RX_SLEEP, 1 );
		nanosleep(&time_req_1us,&time_rem_1us);	//rt_sleep_ns(sleep_ns);
		s_cnt++;	
		VCD_SIGNAL_DUMPER_DUMP_FUNCTION_BY_NAME( VCD_SIGNAL_DUMPER_FUNCTIONS_eNB_RX_SLEEP, 0 );
	      } 
	    }
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	  }
	}
      }
      

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      if (measurements == 1 ) clock_gettime(CLOCK_MONOTONIC,&time1);      
    
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      if (loopback == 1 ) {
	if (sync_eNB_rx[i]==0) {
	  rx_eNB[i] = (void*)&tx_buffer_eNB[i][tx_pos];
	  LOG_I(RRH,"tx_buffer_eNB[i][tx_pos]=%d ,tx_pos=%d\n",tx_buffer_eNB[i][tx_pos],tx_pos);			
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	} else {
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	  rx_eNB[i] = (void*)&rx_buffer_eNB[i][rx_pos];
	  LOG_I(RRH,"rx_buffer_eNB[i][rx_pos]=%d ,rx_pos=%d\n",rx_buffer_eNB[i][rx_pos],rx_pos);	
	}
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       }
       
       for (i=0; i<dev->eth_dev.openair0_cfg.rx_num_channels; i++) {
	 rx_eNB[i] = (void*)&rx_buffer_eNB[i][rx_pos];
	 LOG_D(RRH," rx_eNB[i]=%p rx_buffer_eNB[i][rx_pos]=%p ,rx_pos=%d, i=%d ts=%d\n",rx_eNB[i],&rx_buffer_eNB[i][rx_pos],rx_pos,i,timestamp_rx);	 
       }  
       VCD_SIGNAL_DUMPER_DUMP_VARIABLE_BY_NAME( VCD_SIGNAL_DUMPER_VARIABLES_RXCNT, rx_pos );
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       if (dev->devs->type != NONE_DEV) {
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	 VCD_SIGNAL_DUMPER_DUMP_FUNCTION_BY_NAME( VCD_SIGNAL_DUMPER_FUNCTIONS_TRX_READ_RF, 1 ); 
	 /* Read operation to RF device (RX)*/
	 if ( dev->devs->trx_read_func (dev->devs,
					&timestamp_rx,
					rx_eNB,
					spp_rf,
					dev->devs->openair0_cfg.rx_num_channels
					)<0) {
	   perror("RRH eNB : USRP read");
	 }
	 VCD_SIGNAL_DUMPER_DUMP_FUNCTION_BY_NAME( VCD_SIGNAL_DUMPER_FUNCTIONS_TRX_READ_RF, 0 );	
       }
       VCD_SIGNAL_DUMPER_DUMP_VARIABLE_BY_NAME( VCD_SIGNAL_DUMPER_VARIABLES_RX_TS, timestamp_rx&0xffffffff );

       VCD_SIGNAL_DUMPER_DUMP_FUNCTION_BY_NAME( VCD_SIGNAL_DUMPER_FUNCTIONS_TRX_WRITE, 1 ); 
       if ((bytes_sent = dev->eth_dev.trx_write_func (&dev->eth_dev,
						      timestamp_rx,
						      rx_eNB,
						      spp_eth,
						      dev->eth_dev.openair0_cfg.rx_num_channels,
						      0))<0) {
	 perror("RRH eNB : ETHERNET write");
       }    
       VCD_SIGNAL_DUMPER_DUMP_FUNCTION_BY_NAME( VCD_SIGNAL_DUMPER_FUNCTIONS_TRX_WRITE, 0 );

       /* when there is no RF timestamp is updated by number of samples */
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       if (dev->devs->type == NONE_DEV) {
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	 timestamp_rx+=spp_eth;
	 last_hw_counter=hw_counter;
       }
       
       if (measurements == 1 ) {

	 clock_gettime(CLOCK_MONOTONIC,&time2);
	 
	 if (trace_cnt++ > 10) {
	   total_rx_time = (unsigned int)(time2.tv_nsec - time0.tv_nsec);
	   if (total_rx_time < 0)
	     total_rx_time=1000000000-total_rx_time;
	   
	   if ((total_rx_time > 0) && (total_rx_time < 1000000000)) {
	     trial++;
	     if (total_rx_time < min_rx_time)
	       min_rx_time = total_rx_time;
	     if (total_rx_time > max_rx_time){
	       max_rx_time = total_rx_time;
	       LOG_I(RRH,"Max value %d update at rx_position %d \n",total_rx_time,timestamp_rx);
	     }
	     average_rx_time = (long long unsigned int)((average_rx_time*trial)+total_rx_time)/(trial+1);
	   }
	   if (s_period++ == PRINTF_PERIOD) {
	     s_period=0;
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	     LOG_I(RRH,"Average eNB RX time : %lu ns\tMax RX time : %lu ns\tMin RXX time : %lu ns\n",average_rx_time,max_rx_time,min_rx_time);
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	   }
	 }
	 
	 memcpy(&time0,&time2,sizeof(struct timespec));
       }
       
       if (loopback == 1 ) {
	 pthread_mutex_lock(&sync_eNB_mutex[i]);
	 sync_eNB_rx[i]--;
	 pthread_mutex_unlock(&sync_eNB_mutex[i]);
       }
       
       rx_pos += spp_eth;    
       pck_rx++;
       next_rx_pos=(rx_pos+spp_eth);
       
       VCD_SIGNAL_DUMPER_DUMP_FUNCTION_BY_NAME( VCD_SIGNAL_DUMPER_FUNCTIONS_eNB_RX, 0 );
       /**/
       if (frame>50) {
	 pthread_mutex_lock(&sync_trx_mutex);
	 while (sync_trx) {
	   pthread_cond_wait(&sync_trx_cond,&sync_trx_mutex);
	 }
	 sync_trx=1;
	 LOG_D(RRH,"out of while send:%d  %d\n",sync_trx,frame);
	 pthread_cond_signal(&sync_trx_cond);
	 pthread_mutex_unlock(&sync_trx_mutex);
       }
    } // while 
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    subframe++;
    s_cnt=0;
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    /* wrap around rx buffer index */
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    if (next_rx_pos >= samples_per_frame)
      next_rx_pos -= samples_per_frame;  
    if (rx_pos >= samples_per_frame)
      rx_pos -= samples_per_frame;
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    /* wrap around subframe number */       
    if (subframe == 10 ) {
      subframe = 0; 
      frame++;
    }   
   
    
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  }  //while (eNB_exit==0)
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  return 0;
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}

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/* Receive from eNB and transmit to RF */
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void *rrh_eNB_tx_thread(void *arg) {
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  struct timespec time0a,time0,time1,time2;

  rrh_module_t *dev = (rrh_module_t *)arg;
  struct timespec time_req_1us, time_rem_1us;
  ssize_t bytes_received;
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  int i;
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  openair0_timestamp last_hw_counter=0;
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  unsigned int samples_per_frame=0,samples_per_subframe=0;
  unsigned int  spp_rf=0, spp_eth=0;
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  uint8_t loopback=0,measurements=0;
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  unsigned int subframe=0,frame=0;
  unsigned int pck_tx=0;
  
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#ifdef LOWLATENCY
  struct sched_attr attr;
  unsigned int flags = 0;
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  attr.size = sizeof(attr);
  attr.sched_flags = 0;
  attr.sched_nice = 0;
  attr.sched_priority = 0;
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  attr.sched_policy   = SCHED_DEADLINE;
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  attr.sched_runtime  = (0.8 * 100) * 10000;
  attr.sched_deadline = (0.9 * 100) * 10000;
  attr.sched_period   = 1 * 1000000;
  
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  if (sched_setattr(0, &attr, flags) < 0 ) {
    perror("[SCHED] eNB TX thread: sched_setattr failed\n");
    exit(-1);
  }
#endif	
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  time_req_1us.tv_sec = 1;
  time_req_1us.tv_nsec = 0;
  spp_eth = dev->eth_dev.openair0_cfg.samples_per_packet;
  spp_rf =  dev->devs->openair0_cfg.samples_per_packet;
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  samples_per_frame = dev->eth_dev.openair0_cfg.samples_per_frame;
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  samples_per_subframe = (unsigned int)samples_per_frame/10;
  tx_pos=0;
  //tx_pos_rf=spp_rf*dev->devs->openair0_cfg.tx_delay;
  
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  loopback = dev->loopback;
  measurements = dev->measurements;
  
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  while (rrh_exit == 0) {     
    while (tx_pos < (1 + subframe)*samples_per_subframe) {
      
      LOG_D(RRH,"bef lock read:%d  %d\n",sync_trx,frame);
      pthread_mutex_lock(&sync_trx_mutex);
      
      while (!sync_trx) {
	LOG_D(RRH,"in sync read:%d  %d\n",sync_trx,frame);
	pthread_cond_wait(&sync_trx_cond,&sync_trx_mutex);
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      }
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      LOG_D(RRH,"out of while read:%d  %d\n",sync_trx,frame);
      
      VCD_SIGNAL_DUMPER_DUMP_FUNCTION_BY_NAME( VCD_SIGNAL_DUMPER_FUNCTIONS_eNB_TX, 1 );
      VCD_SIGNAL_DUMPER_DUMP_VARIABLE_BY_NAME( VCD_SIGNAL_DUMPER_VARIABLES_HW_FRAME, frame);
      VCD_SIGNAL_DUMPER_DUMP_VARIABLE_BY_NAME( VCD_SIGNAL_DUMPER_VARIABLES_HW_SUBFRAME, subframe );
      VCD_SIGNAL_DUMPER_DUMP_VARIABLE_BY_NAME( VCD_SIGNAL_DUMPER_VARIABLES_TX_PCK, pck_tx );
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      if (measurements == 1 ) 	clock_gettime(CLOCK_MONOTONIC,&time1); 
      for (i=0; i<dev->eth_dev.openair0_cfg.tx_num_channels; i++) tx_eNB[i] = (void*)&tx_buffer_eNB[i][tx_pos];	//RF!!!!!		
      
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      VCD_SIGNAL_DUMPER_DUMP_VARIABLE_BY_NAME( VCD_SIGNAL_DUMPER_VARIABLES_TXCNT, tx_pos );
      VCD_SIGNAL_DUMPER_DUMP_FUNCTION_BY_NAME( VCD_SIGNAL_DUMPER_FUNCTIONS_TRX_READ, 1 );
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      /* Read operation to ETHERNET device */
      if (( bytes_received = dev->eth_dev.trx_read_func(&dev->eth_dev,
							&timestamp_tx,
							tx_eNB,
							spp_eth,
							dev->eth_dev.openair0_cfg.tx_num_channels))<0) {
	perror("RRH eNB : ETHERNET read");
      }		
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      VCD_SIGNAL_DUMPER_DUMP_FUNCTION_BY_NAME( VCD_SIGNAL_DUMPER_FUNCTIONS_TRX_READ, 0 );	
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      if (dev->devs->type != NONE_DEV) {  
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	LOG_D(RRH," tx_buffer_eNB[i][tx_pos]=%x t_buffer_eNB[i][tx_pos+1]=%x t_buffer_eNB[i][tx_pos+2]=%x \n",tx_buffer_eNB[0][tx_pos],tx_buffer_eNB[0][tx_pos+1],tx_buffer_eNB[0][tx_pos+2]);	 
	VCD_SIGNAL_DUMPER_DUMP_FUNCTION_BY_NAME( VCD_SIGNAL_DUMPER_FUNCTIONS_TRX_WRITE_RF, 1 );    
	/* Write operation to RF device (TX)*/
	if ( dev->devs->trx_write_func (dev->devs,
					timestamp_tx,
					tx_eNB,
					spp_rf,
					dev->devs->openair0_cfg.tx_num_channels,
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					1)<0){
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	  perror("RRH eNB : USRP write");
	}
	VCD_SIGNAL_DUMPER_DUMP_FUNCTION_BY_NAME( VCD_SIGNAL_DUMPER_FUNCTIONS_TRX_WRITE_RF, 0 );
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      }
      
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      VCD_SIGNAL_DUMPER_DUMP_VARIABLE_BY_NAME( VCD_SIGNAL_DUMPER_VARIABLES_TX_TS, timestamp_tx&0xffffffff ); 
      
            
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      if (dev->devs->type == NONE_DEV)	last_hw_counter=hw_counter;
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      if (loopback ==1 ) { 
	while (sync_eNB_rx[i]==0)
	  nanosleep(&time_req_1us,&time_rem_1us);
	
	pthread_mutex_lock(&sync_eNB_mutex[i]);
	sync_eNB_rx[i]++;
	pthread_mutex_unlock(&sync_eNB_mutex[i]);
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      }      
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      if (measurements == 1 ) {
	clock_gettime(CLOCK_MONOTONIC,&time2);
	memcpy(&time0,&time2,sizeof(struct timespec));
      }   
      
      prev_tx_pos=tx_pos;
      tx_pos += spp_eth;
      pck_tx++;   
      
      VCD_SIGNAL_DUMPER_DUMP_FUNCTION_BY_NAME(VCD_SIGNAL_DUMPER_FUNCTIONS_eNB_TX, 0 );
      sync_trx=0;
      pthread_cond_signal(&sync_trx_cond);
      pthread_mutex_unlock(&sync_trx_mutex);
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    }

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    /* wrap around tx buffer index */
    if (tx_pos >= samples_per_frame)
      tx_pos -= samples_per_frame;    
    /* wrap around subframe number */ 
    subframe++;
    if (subframe == 10 ) {
      subframe = 0; // the radio frame is complete, start over
      frame++;
    }
    
  } //while (eNB_exit==0)   
  return 0;
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}

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static void calc_rt_period_ns( openair0_config_t openair0_cfg) {
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  rt_period= (double)(openair0_cfg.samples_per_packet/(openair0_cfg.samples_per_frame/10.0)*1000000);
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  AssertFatal(rt_period > 0, "Invalid rt period !%u\n", rt_period);
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  LOG_I(RRH,"[eNB] Real time period is set to %u ns\n", rt_period);	
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}


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static void check_dev_config( rrh_module_t *mod_enb) {
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 AssertFatal( (mod_enb->devs->openair0_cfg.num_rb_dl==100 || mod_enb->devs->openair0_cfg.num_rb_dl==50 || mod_enb->devs->openair0_cfg.num_rb_dl==25 || mod_enb->devs->openair0_cfg.num_rb_dl==6) , "Invalid number of resource blocks! %d\n", mod_enb->devs->openair0_cfg.num_rb_dl);
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 AssertFatal( mod_enb->devs->openair0_cfg.samples_per_frame  > 0 ,  "Invalid number of samples per frame! %d\n",mod_enb->devs->openair0_cfg.samples_per_frame); 
 AssertFatal( mod_enb->devs->openair0_cfg.sample_rate        > 0.0, "Invalid sample rate! %f\n", mod_enb->devs->openair0_cfg.sample_rate);
 AssertFatal( mod_enb->devs->openair0_cfg.samples_per_packet > 0 ,  "Invalid number of samples per packet! %d\n",mod_enb->devs->openair0_cfg.samples_per_packet);
 AssertFatal( mod_enb->devs->openair0_cfg.rx_num_channels    > 0 ,  "Invalid number of RX antennas! %d\n", mod_enb->devs->openair0_cfg.rx_num_channels); 
 AssertFatal( mod_enb->devs->openair0_cfg.tx_num_channels    > 0 ,  "Invalid number of TX antennas! %d\n", mod_enb->devs->openair0_cfg.tx_num_channels);
 AssertFatal( mod_enb->devs->openair0_cfg.rx_freq[0]         > 0.0 ,"Invalid RX frequency! %f\n", mod_enb->devs->openair0_cfg.rx_freq[0]); 
 AssertFatal( mod_enb->devs->openair0_cfg.tx_freq[0]         > 0.0 ,"Invalid TX frequency! %f\n", mod_enb->devs->openair0_cfg.tx_freq[0]);
 AssertFatal( mod_enb->devs->openair0_cfg.rx_gain[0]         > 0.0 ,"Invalid RX gain! %f\n", mod_enb->devs->openair0_cfg.rx_gain[0]); 
 AssertFatal( mod_enb->devs->openair0_cfg.tx_gain[0]         > 0.0 ,"Invalid TX gain! %f\n", mod_enb->devs->openair0_cfg.tx_gain[0]);
 AssertFatal( mod_enb->devs->openair0_cfg.rx_bw              > 0.0 ,"Invalid RX bw! %f\n", mod_enb->devs->openair0_cfg.rx_bw); 
 AssertFatal( mod_enb->devs->openair0_cfg.tx_bw              > 0.0 ,"Invalid RX bw! %f\n", mod_enb->devs->openair0_cfg.tx_bw);
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 AssertFatal( mod_enb->devs->openair0_cfg.autocal[0]         > 0 ,  "Invalid auto calibration choice! %d\n", mod_enb->devs->openair0_cfg.autocal[0]);
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 printf("\n---------------------RF device configuration parameters---------------------\n");
 
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 printf("\tMod_id=%d\n \tlog level=%d\n \tDL_RB=%d\n \tsamples_per_frame=%d\n \tsample_rate=%f\n \tsamples_per_packet=%d\n \ttx_delay=%d\n \ttx_forward_nsamps=%d\n \trx_num_channels=%d\n \ttx_num_channels=%d\n \trx_freq_0=%f\n \ttx_freq_0=%f\n \trx_freq_1=%f\n \ttx_freq_1=%f\n \trx_freq_2=%f\n \ttx_freq_2=%f\n \trx_freq_3=%f\n \ttx_freq_3=%f\n \trxg_mode=%d\n \trx_gain_0=%f\n \ttx_gain_0=%f\n  \trx_gain_1=%f\n \ttx_gain_1=%f\n  \trx_gain_2=%f\n \ttx_gain_2=%f\n  \trx_gain_3=%f\n \ttx_gain_3=%f\n \trx_gain_offset_2=%f\n \ttx_gain_offset_3=%f\n  \trx_bw=%f\n \ttx_bw=%f\n \tautocal=%d\n",	
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
	mod_enb->devs->openair0_cfg.Mod_id,
	mod_enb->devs->openair0_cfg.log_level,
	mod_enb->devs->openair0_cfg.num_rb_dl,
	mod_enb->devs->openair0_cfg.samples_per_frame,
	mod_enb->devs->openair0_cfg.sample_rate,
	mod_enb->devs->openair0_cfg.samples_per_packet,
	mod_enb->devs->openair0_cfg.tx_delay,
	mod_enb->devs->openair0_cfg.tx_forward_nsamps,
	mod_enb->devs->openair0_cfg.rx_num_channels,
	mod_enb->devs->openair0_cfg.tx_num_channels,
	mod_enb->devs->openair0_cfg.rx_freq[0],
	mod_enb->devs->openair0_cfg.tx_freq[0],
	mod_enb->devs->openair0_cfg.rx_freq[1],
	mod_enb->devs->openair0_cfg.tx_freq[1],
	mod_enb->devs->openair0_cfg.rx_freq[2],
	mod_enb->devs->openair0_cfg.tx_freq[2],
	mod_enb->devs->openair0_cfg.rx_freq[3],
	mod_enb->devs->openair0_cfg.tx_freq[3],
	mod_enb->devs->openair0_cfg.rxg_mode[0],
	mod_enb->devs->openair0_cfg.rx_gain[0],
	mod_enb->devs->openair0_cfg.tx_gain[0],
	mod_enb->devs->openair0_cfg.rx_gain[1],
	mod_enb->devs->openair0_cfg.tx_gain[1],
	mod_enb->devs->openair0_cfg.rx_gain[2],
	mod_enb->devs->openair0_cfg.tx_gain[2],
	mod_enb->devs->openair0_cfg.rx_gain[3],
	mod_enb->devs->openair0_cfg.tx_gain[3],
	//mod_enb->devs->openair0_cfg.rx_gain_offset[0],
	//mod_enb->devs->openair0_cfg.rx_gain_offset[1],
	mod_enb->devs->openair0_cfg.rx_gain_offset[2],
	mod_enb->devs->openair0_cfg.rx_gain_offset[3],
	mod_enb->devs->openair0_cfg.rx_bw,
	mod_enb->devs->openair0_cfg.tx_bw,
833
	mod_enb->devs->openair0_cfg.autocal[0]  
834
835
836
837
838
	);
 
 printf("----------------------------------------------------------------------------\n");
 
 
839
}