radio_ms.c

软件无线电的平台

/***************************************************************************
               radio_ms.c  -  SRadio controller module
                            -------------------
    begin                :  02/10/30
    authors              :  Linus Gasser
    emails               :  [e-mail]
 ***************************************************************************/

/***************************************************************************
                                 Changes
                                 -------
 date - name - description
 02/10/30 - ineiti - begin
 03/01/09 - ineiti - clean up
 03/02/27 - ineiti - simplified to only two slots
 04/04/20 - ineiti - exit was not correct
 
 **************************************************************************/

/***************************************************************************
 *                                                                         *
 *   This program 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 2 of the License, or     *
 *   (at your option) any later version.                                   *
 *                                                                         *
 ***************************************************************************/


/**
 * Make a simple MS that connects to the BS.
 *
 * Function:
 * - listen to Synch
 * - find synch
 * - send RACh
 */

#include "system.h"
#include "sdb.h"
#include "stfa.h"
#include "antenna.h"
#include "std.h"
#include "debugging.h"
#include "../simple_radio.h"
#include "chain.h"
#include "../common.h"


#define ANTENNA 0
#define DBG_LVL 0

swr_sdb_id stfa,mafi, macro_synch, sch, encode;
struct chain_t *ch_ldpc, *ch_bch;
struct slot_bch bch_data;

int slots_per_frame, blocks_per_slot;

enum st{ synch_primary, send_ldpc, stop_stfa, done } state;
int count, loops;


int callback( int msg, void *data, swr_sdb_id ret_id );

/**
 * This function is called once to clean up the synchronisation-macro,
 * set up the bch and up-channel, and to set the callback-function
 * as default.
 */
int synchronised( int msg, void *data, swr_sdb_id ret_id ) {
  swr_sdb_id randstr, synch_rcv;

  // Clean the synchronisation
  swr_sdb_set_config_int( macro_synch, "synch", 0 );

  // Initialise some values
  count = 0;
  synch_rcv = swr_sdb_get_stats_int( macro_synch, "synch_rcv" );
  swr_stfa_notice_func( stfa, 0, callback );

  state++;
  count = 0;

  // Listen to the bch
  ch_bch = swr_chain_create( OLD_SPC( synch_rcv ),
                             NEW_SPC_VAR( "matched_filter", mafi ),
                             NEW_SPC( "despread" ),
                             NEW_SPC( "slicer" ),
                             NEW_SPC_VAR( "sch_rcv", sch ),
			     CHAIN_END );
  swr_sdb_set_config_pointer( sch, "data_usr", &bch_data );
  swr_sdb_set_config_int( sch, "len_usr", sizeof( struct slot_bch ) );
  swr_sdb_set_config_int( sch, "antenna", 0 );
  swr_sdb_set_config_int( sch, "id", 0x1234 );
  swr_sdb_set_config_int( mafi, "gain_control", 9000 );


  // And setup a simple RACH-chain...
  ch_ldpc = swr_chain_create( NEW_SPC_VAR( "rndstr", randstr ),
                              NEW_SPC_VAR( "ldpc_encode", encode ),
                              NEW_SPC( "mapper" ),
                              NEW_SPC( "midamble" ),
                              NEW_SPC( "rrc" ),
                              OLD_SPC_IN( stfa, 1 ),
			      CHAIN_END );
  swr_stfa_notice_sdb( stfa, 1, randstr );
  PR( "Ready to go\n" );
  return 0;
}


void do_ldpc( void ) {

  if ( swr_sdb_get_stats_int( sch, "valid" ) && bch_data.ldpc_code_id ) {
    PR_DBG( 2, "Ldpc-code-id: %i\n", bch_data.ldpc_code_id );
    swr_sdb_set_config_int( encode, "ldpc_code_id", bch_data.ldpc_code_id );
  } else {
    PR_DBG( 1, "Not yet recognized by BS\n" );
  }
}


int callback( int msg, void *data, swr_sdb_id ret_id ) {

  switch( state ) {
  case synch_primary:
    // Will never be called...
    break;
  case send_ldpc:
    do_ldpc();
    break;
  case stop_stfa:
    swr_stfa_stop( stfa );
    state++;
    break;
  case done:
    // WARNING: this is never reached...
    PR( "Done...\n" );
    break;
  }
  return 0;
}

void *start_it( void *arg ) {
  int i;

  usleep( 1000000 );
  PR( "getting sdbs\n" );
  stfa = swr_sdb_instantiate_name( "stfa" );

  slots_per_frame = swr_sdb_get_stats_int( stfa, "slots_per_frame" );
  blocks_per_slot = swr_sdb_get_stats_int( stfa, "blocks_per_slot" );

  count = 0;
  state = synch_primary;
  ch_ldpc = ch_bch = NULL;

  PR( "Setting up synchronisation\n" );
  macro_synch = swr_sdb_instantiate_name( "macro_synch" );
  swr_sdb_set_config_int( macro_synch, "stfa_id", stfa );
  swr_sdb_set_config_int( macro_synch, "synch", 1 );
  swr_sdb_set_config_pointer( macro_synch, "call_synched", synchronised );

  PR( "Starting stfa\n" );
  swr_stfa_go( stfa );

  i = 0;
  while ( state != done ) {
    //    PR( "%2i seconds past\n", i );
    usleep( 1000000 );
    i++;
  }

  PR( "stfa stopped\n" );
  swr_sdb_set_config_int( macro_synch, "synch", 0 );

  return NULL;
}

struct thread start;

/**
 * This function is called upon "insmod" and is used to register the
 * different parts of the module to the SPM.
 */
int um_module_init(void) {

  MOD_INC_USE_COUNT;
  if ( swr_thread_init( &start, start_it, NULL ) ) {
    goto rrc_no_thread;
  }
  MOD_DEC_USE_COUNT;
  return 0;

rrc_no_thread:
  PR( "Couldn't init thread\n" );
  MOD_DEC_USE_COUNT;
  return -1;
}

void um_module_exit( void ) {

  state = stop_stfa;
  PR( "deleting everything\n" );
  swr_thread_free( &start, NULL );

  swr_sdb_destroy( macro_synch );
  swr_chain_destroy( ch_ldpc );
  swr_chain_destroy( ch_bch );
  swr_sdb_destroy( stfa );

}


module_init( um_module_init );
module_exit( um_module_exit );