radio_ics_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
 03/03/06 - ineiti - added synchronisation-macro
 03/03/19 - ineiti - added SCH and gain-control
 04/04/08 - ineiti - made an uplink instead of a downlink
 
 **************************************************************************/

/***************************************************************************
 *                                                                         *
 *   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
 * - set up a channel for sending
 */

#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[NO_RX], mafi, macro_synch, sch, rrc_rcv_synch,
  slicer[NO_RX], slcr, rrc_rcv[NO_RX], chest_rcv[NO_RX], 
  decoder, rcd, rand_rcv;
struct chain_t *ch_up[NO_RX], *ch_bch, *ch_test;
enum st{ user_mode, synching, send_up, stop_stfa, done } state;
int count, offset;
struct bch_struct bch_data;

int a;

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


/*
 * uplink-chain
 */
void setup_uplink( void ){
  int a, spread[NO_TX];

  swr_sdb_id rand_u8, rrc_send[NO_TX],
    mapper, chest_send[NO_TX], split;
  PR( "Setting up an uplink\n" );
  ch_up[0] = swr_chain_create(
				NEW_SPC_VAR( "random", rand_u8 ),
				NEW_SPC_VAR( "mapper", mapper ),
				NEW_SPC_VAR( "split", split ),
				NEW_SPC_VAR( "spread", spread[0] ),
				NEW_SPC_VAR( "chest_send", chest_send[0] ),
				NEW_SPC_VAR( "rrc_complex_send", rrc_send[0] ),
				OLD_SPC_IN( stfa[0], 2 ),
				CHAIN_END );
  
  swr_sdb_set_config_int( rand_u8, "mode", 1 );
  swr_sdb_set_config_int( rand_u8, "seed", 0x1234 );
  
  for ( a=0; a<NO_TX; a++ ){
    if ( a ){
      ch_up[a] = swr_chain_create(
				  OLD_SPC_OUT( split, a ),
				  NEW_SPC_VAR( "spread", spread[a] ),
				  NEW_SPC_VAR( "chest_send", chest_send[a] ),
				  NEW_SPC_VAR( "rrc_complex_send", rrc_send[a] ),
				  OLD_SPC_IN( stfa[a], 2 ),
				  CHAIN_END );
    }

    swr_sdb_set_config_int( chest_send[a], "index", a ); 
    swr_sdb_set_config_int( rrc_send[a], "rrc_index", 2 );
    swr_sdb_set_config_int( spread[a], "sequence", spread_ortho_8[a] );
  }

  swr_stfa_notice_sdb( stfa[0], 2, rand_u8 );
}



/**
 * 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 ) {
  // Initialise some values
  count = 0;
  state = send_up;
  offset = swr_sdb_get_stats_int( macro_synch, "offset" );
  rrc_rcv_synch = 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_synch ),
			    NEW_SPC_VAR( "chest_rcv", mafi ),
			    NEW_SPC( "despread" ),
			    NEW_SPC_VAR( "slicer", slcr ),
			    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(slcr, "mafi_id", mafi);

  setup_uplink();
    
  PR( "Ready to go" );
  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<NO_RX; 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 );
  PR( "Slots: %i, Length: %i\n", SLOTS, SLOT_LEN );

  // Initialise our local vars
  ch_bch = NULL;
  for ( i = 0; i< NO_RX; i++) {
    ch_up[i]=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 );
  }

  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 bch\n" );
  swr_chain_destroy( ch_bch );
  PR( "Destroying macro_synch\n" );
  swr_sdb_destroy( macro_synch );
  for ( i=0; i<NO_RX; i++ ){
    PR( "Destroying transmitting chains[%i]\n", i );
    swr_chain_destroy( ch_up[i] );
  }
  for ( i=0; i<NO_RX; i++ ){
    PR( "Destroying stfa[%i]\n", i );
    swr_sdb_destroy( stfa[i] );
  }
}


module_init( um_module_init );
module_exit( um_module_exit );