Skip to content
This repository

HTTPS clone URL

Subversion checkout URL

You can clone with HTTPS or Subversion.

Download ZIP
branch: master
Fetching contributors…

Cannot retrieve contributors at this time

file 223 lines (178 sloc) 7.813 kb
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223
/*
* Copyright 2008 Free Software Foundation, Inc.
*
* This software is distributed under the terms of the GNU Public License.
* See the COPYING file in the main directory for details.
*
* This use of this software may be subject to additional restrictions.
* See the LEGAL file in the main directory for details.

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 3 of the License, or
(at your option) any later version.

This program 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 this program. If not, see <http://www.gnu.org/licenses/>.

*/


#ifdef HAVE_CONFIG_H
#include "config.h"
#endif

#include "usrp_standard.h"
#include "usrp_bytesex.h"
#include "usrp_prims.h"
#include <sys/time.h>
#include <math.h>
#include <string>
#include <iostream>


/** Define types which are not defined in libusrp-3.1 */
#ifndef HAVE_LIBUSRP_3_2
#include <boost/shared_ptr.hpp>
typedef boost::shared_ptr<usrp_standard_tx> usrp_standard_tx_sptr;
typedef boost::shared_ptr<usrp_standard_rx> usrp_standard_rx_sptr;
#endif // HAVE_LIBUSRP_3_2

/** a 64-bit virtual timestamp for USRP data */
typedef unsigned long long TIMESTAMP;

/** A class to handle a USRP rev 4, with a two RFX900 daughterboards */
class USRPDevice {

private:

  static const double masterClockRate; ///< the USRP clock rate
  double desiredSampleRate; ///< the desired sampling rate
  usrp_standard_rx_sptr m_uRx; ///< the USRP receiver
  usrp_standard_tx_sptr m_uTx; ///< the USRP transmitter

  double actualSampleRate; ///< the actual USRP sampling rate
  unsigned int decimRate; ///< the USRP decimation rate

  unsigned long long samplesRead; ///< number of samples read from USRP
  unsigned long long samplesWritten; ///< number of samples sent to USRP

  bool started; ///< flag indicates USRP has started
  bool skipRx; ///< set if USRP is transmit-only.

  static const unsigned int currDataSize_log2 = 21;
  static const unsigned long currDataSize = (1 << currDataSize_log2);
  short *data;
  unsigned long dataStart;
  unsigned long dataEnd;
  TIMESTAMP timeStart;
  TIMESTAMP timeEnd;
  bool isAligned;

  Mutex writeLock;

  short *currData; ///< internal data buffer when reading from USRP
  TIMESTAMP currTimestamp; ///< timestamp of internal data buffer
  unsigned currLen; ///< size of internal data buffer

  TIMESTAMP timestampOffset; ///< timestamp offset b/w Tx and Rx blocks
  TIMESTAMP latestWriteTimestamp; ///< timestamp of most recent ping command
  TIMESTAMP pingTimestamp; ///< timestamp of most recent ping response
  static const TIMESTAMP PINGOFFSET = 272; ///< undetermined delay b/w ping response timestamp and true receive timestamp
  unsigned long hi32Timestamp;
  unsigned long lastPktTimestamp;

#ifdef SWLOOPBACK
  short loopbackBuffer[1000000];
  int loopbackBufferSize;
  double samplePeriod;

  struct timeval startTime;
  struct timeval lastReadTime;
  bool firstRead;
#endif

  /** Mess of constants used to control various hardware on the USRP */
  static const unsigned POWER_UP = (1 << 7);
  static const unsigned RX_TXN = (1 << 6);
  static const unsigned RX2_RX1N = (1 << 6);
  static const unsigned ENABLE = (1 << 5);
  static const unsigned PLL_LOCK_DETECT = (1 << 2);
  
  static const unsigned SPI_ENABLE_TX_A = 0x10;
  static const unsigned SPI_ENABLE_RX_A = 0x20;
  static const unsigned SPI_ENABLE_TX_B = 0x40;
  static const unsigned SPI_ENABLE_RX_B = 0x80;

  static const unsigned SPI_FMT_MSB = (0 << 7);
  static const unsigned SPI_FMT_HDR_0 = (0 << 5);

  static const float LO_OFFSET;
  //static const float LO_OFFSET = 4.0e6;

  static const unsigned R_DIV = 16;
  static const unsigned P = 1;
  static const unsigned CP2 = 7;
  static const unsigned CP1 = 7;
  static const unsigned DIVSEL = 0;
  unsigned DIV2; // changes with GSM band
  unsigned freq_mult; // changes with GSM band
  static const unsigned CPGAIN = 0;
  
  // R-Register Common Values
  static const unsigned R_RSV = 0; // bits 23,22
  static const unsigned BSC = 3; // bits 21,20 Div by 8 to be safe
  static const unsigned TEST = 0; // bit 19
  static const unsigned LDP = 1; // bit 18
  static const unsigned ABP = 0; // bit 17,16 3ns
  
  // N-Register Common Values
  static const unsigned N_RSV = 0; // bit 7
  
  // Control Register Common Values
  static const unsigned PD = 0; // bits 21,20 Normal operation
  static const unsigned PL = 0; // bits 13,12 11mA
  static const unsigned MTLD = 1; // bit 11 enabled
  static const unsigned CPG = 0; // bit 10 CP setting 1
  static const unsigned CP3S = 0; // bit 9 Normal
  static const unsigned PDP = 1; // bit 8 Positive
  static const unsigned MUXOUT = 1;// bits 7:5 Digital Lock Detect
  static const unsigned CR = 0; // bit 4 Normal
  static const unsigned PC = 1; // bits 3,2 Core power 10mA

  // ATR register value
  static const int FR_ATR_MASK_0 = 20;
  static const int FR_ATR_TXVAL_0 = 21;
  static const int FR_ATR_RXVAL_0 = 22;

  /** Compute register values to tune daughterboard to desired frequency */
  bool compute_regs(double freq,
unsigned *R,
unsigned *control,
unsigned *N,
double *actual_freq);

  /** Set the transmission frequency */
  bool tx_setFreq(double freq, double *actual_freq);

  /** Set the receiver frequency */
  bool rx_setFreq(double freq, double *actual_freq);
  
 public:

  /** Object constructor */
  USRPDevice (double _desiredSampleRate);

  /** Instantiate the USRP */
  bool make(bool skipRx = false);

  /** Start the USRP */
  bool start();

  /** Stop the USRP */
  bool stop();

  /**
Read samples from the USRP.
@param buf preallocated buf to contain read result
@param len number of samples desired
@param overrun Set if read buffer has been overrun, e.g. data not being read fast enough
@param timestamp The timestamp of the first samples to be read
@param underrun Set if USRP does not have data to transmit, e.g. data not being sent fast enough
@param RSSI The received signal strength of the read result
@return The number of samples actually read
*/
  int readSamples(short *buf, int len, bool *overrun,
TIMESTAMP timestamp = 0xffffffff,
bool *underrun = NULL,
unsigned *RSSI = NULL);
  /**
Write samples to the USRP.
@param buf Contains the data to be written.
@param len number of samples to write.
@param underrun Set if USRP does not have data to transmit, e.g. data not being sent fast enough
@param timestamp The timestamp of the first sample of the data buffer.
@param isControl Set if data is a control packet, e.g. a ping command
@return The number of samples actually written
*/
  int writeSamples(short *buf, int len, bool *underrun,
TIMESTAMP timestamp = 0xffffffff,
bool isControl = false);
 
  /** Update the alignment between the read and write timestamps */
  bool updateAlignment(TIMESTAMP timestamp);
  
  /** Set the transmitter frequency */
  bool setTxFreq(double wFreq);

  /** Set the receiver frequency */
  bool setRxFreq(double wFreq);

  /** Return internal status values */
  inline double getTxFreq() { return 0;}
  inline double getRxFreq() { return 0;}
  inline double getSampleRate() {return actualSampleRate;}
  inline double numberRead() { return samplesRead; }
  inline double numberWritten() { return samplesWritten;}

};
Something went wrong with that request. Please try again.