radio_ics_ms.c

软件无线电的平台

/***************************************************************************
               radio_ics_ms.c  -  SRadio simple bs
                            -------------------
    begin                :  04/02/12
    authors              :  PHiLippe Roud
    emails               :  [e-mail]
 ***************************************************************************/

/***************************************************************************
                                 Changes
                                 -------
 date - name - description
 04/02/12 - phil - begin
 04/03/17 - ineiti - chest->circ_ext = 0
 04/03/19 - ineiti - chest->circ_ext = 8, again

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

/***************************************************************************
 *                                                                         *
 *   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
 * - decode LDPC
 */

#include "system.h"
#include "sdb.h"
#include "stfa.h"
#include "antenna.h"
#include "std.h"
#include "debugging.h"
#include "../radio_ics.h"
#include "chain.h"
#include "spc.h"

#define DBG_LVL 4

swr_sdb_id stfa[ANTENNAS], mafi, macro_synch, sch, rrc_rcv,
  slicer, rrc_rcv, chest_rcv, decoder, rcd, rand_rcv;
struct chain_t *ch_down, *ch_bch, *ch_test;
enum st{ user_mode, synching, send_up, stop_stfa, done } state;
int count, offset;
struct bch_struct bch_data;

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 spread, rand_u8; */

  // Initialise some values
  count = 0;
  state = send_up;
  offset = swr_sdb_get_stats_int( macro_synch, "offset" );
  rrc_rcv = swr_sdb_get_stats_int( macro_synch, "rrc_rcv" );
  swr_stfa_notice_func( stfa[0], 0, callback );

  // Listen to the bch
  ch_bch = swr_chain_create(
             OLD_SPC( rrc_rcv ),
             NEW_SPC_VAR( "chest_rcv", mafi ),
             NEW_SPC( "despread" ),
             NEW_SPC_VAR( "slicer", slicer ),
             NEW_SPC_VAR( "sch_rcv", sch ),
             CHAIN_END );
  swr_sdb_set_config_int( sch, "antenna", 0 );
  swr_sdb_set_config_int( sch, "id", 0x1234 );

  swr_sdb_set_config_int( mafi, "calc_taps", 8 );
  swr_sdb_set_config_int( mafi, "align", 1 );

  //Give the mafi_id to the slicer, so it can get the 
  //max signal amplitude from the matched filter
  //if set to -1, the slicer evaluate the ampl itself
  swr_sdb_set_config_int(slicer, "mafi_id", mafi);

  ch_down = swr_chain_create(
			     OLD_SPC_OUT( stfa[0], 2 ),
			     NEW_SPC_VAR( "rrc_complex_ics_rcv",rrc_rcv ),
			     NEW_SPC_VAR( "chest_rcv",chest_rcv ),
			     NEW_SPC_VAR( "ldpc_decode_siso_ics",decoder ),
			     NEW_SPC_VAR( "test_data_rcv",rcd ),
			     CHAIN_END );
 // set the test_data_received block
  swr_sdb_set_config_int( rcd, "wait", 1 );
  swr_sdb_set_config_int( rcd, "mode", 1 );
  swr_sdb_set_config_int( chest_rcv, "calc_taps", 5 );
  swr_sdb_set_config_int( chest_rcv, "align", 1 );
  swr_sdb_set_config_int( chest_rcv, "circ_ext", 8 );

  swr_sdb_set_config_int( rrc_rcv, "channel", 0 );
  swr_sdb_set_config_int( rrc_rcv, "rrc_index", 2 );

  // set up the ldpc-decoder
  swr_sdb_set_config_int( decoder, "ldpc_code_id", 3 );
  swr_sdb_set_config_int( decoder, "iterations", 30 );
  swr_sdb_set_config_int( decoder, "chest", chest_rcv );
#ifdef USER_SPACE
  swr_sdb_set_config_int( decoder, "drop_blocks", 1 );
#else
  swr_sdb_set_config_int( decoder, "drop_blocks", 10 );
#endif

  PR( "Connecting the test_data modules\n" );
  ch_test = swr_chain_create( NEW_SPC_VAR( "random", rand_rcv ),
			      OLD_SPC_IN( rcd, 1 ),
			      CHAIN_END );
  swr_sdb_set_config_int( rand_rcv, "mode", 1 );
  swr_sdb_set_config_int( rand_rcv, "seed", 0x1234 );
  call_module( rand_rcv );
  make_thread( rrc_rcv );
 
  PR( "Ready to go\n" );
  return 0;
}


/**
 * Once a frame this function is called. Do here whatever seems accurate...
 */
void do_send_up( void ) {
}


/**
 * The first time this
 */
int callback( int msg, void *data, swr_sdb_id ret_id ) {

  count++;
  switch( state ) {
  case send_up:
    do_send_up();
    break;
  case stop_stfa:
    swr_stfa_stop( stfa[0] );
    state++;
    break;
  case done:
    // WARNING: this is never reached...
    PR( "Done...\n" );
    break;
  default:
    break;
  }
  return 0;
}

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

  PR( "getting sdbs\n" );
  stfa[0] = swr_sdb_instantiate_name( "stfa_ics" );
  for ( i=1; i<ANTENNAS; i++ ){
    stfa[i] = swr_sdb_instantiate_name( "stfa_ics" );
    swr_sdb_set_config_int( stfa[i-1], "stfa_id", stfa[i] );
  }

  // Initialise the STFA
  swr_sdb_set_config_int( stfa[0], "slots_per_frame", SLOTS );
  swr_sdb_set_config_int( stfa[0], "blocks_per_slot", SLOT_LEN );
  swr_sdb_set_config_int( stfa[0], "slot_send_offset", SLOT_OFFSET );
  swr_sdb_set_config_int( stfa[0], "freq", 2380 );
  swr_sdb_set_config_int( stfa[0], "attn_tx", 31 );
  PR( "Slots: %i, Length: %i\n", SLOTS, SLOT_LEN );

  // Initialise our local vars
  ch_down = ch_bch = NULL;

  // This sets up the synchronisation-macro
  PR( "Setting up synchronisation\n" );
  macro_synch = swr_sdb_instantiate_name( "macro_synch_ics" );
  swr_sdb_set_config_int( macro_synch, "stfa_id", stfa[0] );
  swr_sdb_set_config_pointer( macro_synch, "call_synched", synchronised );
  swr_sdb_set_config_int( macro_synch, "synch", 1 );

  PR( "Starting stfa\n" );
  swr_stfa_go( stfa[0] );

  i = 0;
  while ( state != done ) {
    usleep( 1000000 );
  }

  PR( "And stopping STFA\n" );
  swr_stfa_stop( stfa[0] );
  PR( "stfa stopped\n" );

  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) {

  state = synching;
  if ( swr_thread_init( &start, start_it, NULL ) ) {
    goto rrc_no_thread;
  }
  return 0;

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

void um_module_exit( void ) {
  int i;

  state = done;
  PR( "Waiting for thread to finish\n" );
  swr_thread_free( &start, NULL );
  
  PR( "Destroying test\n" );
  swr_chain_destroy( ch_test );
  PR( "Destroying uplink\n" );
  swr_chain_destroy( ch_down );
  PR( "Destroying bch\n" );
  swr_chain_destroy( ch_bch );
  PR( "Destroying macro_synch\n" );
  swr_sdb_destroy( macro_synch );
  PR( "Destroying stfas\n" );
  for ( i=0; i<ANTENNAS; i++ ){
    PR( "Destroying stfa[%i]\n", i );
    swr_sdb_destroy( stfa[i] );
  }
  PR( "MS finished\n" );
}


module_init( um_module_init );
module_exit( um_module_exit );