Decouple the FPGA DMA signal source from the AD9361 FPGA signal source.

src/algorithms/signal_source/adapters/CMakeLists.txt

@@ -41,6 +41,14 @@ if(ENABLE_AD9361)
     list(APPEND OPT_DRIVER_HEADERS ad9361_fpga_signal_source.h)
 endif()
 
+if(ENABLE_FPGA)
+    ###############################################
+    # FPGA DMA source
+    ###############################################
+    list(APPEND OPT_DRIVER_SOURCES dma_fpga_signal_source.cc)
+    list(APPEND OPT_DRIVER_HEADERS dma_fpga_signal_source.h)
+endif()
+
 if(ENABLE_FLEXIBAND AND TELEORBIT_FOUND)
     list(APPEND OPT_DRIVER_SOURCES flexiband_signal_source.cc)
     list(APPEND OPT_DRIVER_HEADERS flexiband_signal_source.h)

src/algorithms/signal_source/adapters/ad9361_fpga_signal_source.cc

@@ -26,22 +26,14 @@
 #include "GPS_L1_CA.h"
 #include "GPS_L5.h"
 #include "ad9361_manager.h"
-#include "command_event.h"
 #include "configuration_interface.h"
 #include "gnss_sdr_flags.h"
 #include "gnss_sdr_string_literals.h"
-#include "uio_fpga.h"
-#include <iio.h>
 #include <algorithm>  // for std::max
 #include <chrono>     // for std::chrono
 #include <cmath>      // for std::floor
 #include <exception>  // for std::exception
-#include <fcntl.h>    // for open, O_WRONLY
-#include <fstream>    // for std::ifstream
-#include <iomanip>    // for std::setprecision
 #include <iostream>   // for std::cout
-#include <unistd.h>   // for write
-#include <vector>     // fr std::vector
 
 #if USE_GLOG_AND_GFLAGS
 #include <glog/logging.h>
@@ -56,12 +48,10 @@ Ad9361FpgaSignalSource::Ad9361FpgaSignalSource(const ConfigurationInterface *con
     const std::string &role, unsigned int in_stream, unsigned int out_stream,
     Concurrent_Queue<pmt::pmt_t> *queue __attribute__((unused)))
     : SignalSourceBase(configuration, role, "Ad9361_Fpga_Signal_Source"s),
-      queue_(queue),
       gain_mode_rx1_(configuration->property(role + ".gain_mode_rx1", default_gain_mode)),
       gain_mode_rx2_(configuration->property(role + ".gain_mode_rx2", default_gain_mode)),
       rf_port_select_(configuration->property(role + ".rf_port_select", default_rf_port_select)),
       filter_filename_(configuration->property(role + ".filter_filename", filter_file_)),
-      filename0_(configuration->property(role + ".filename", empty_string)),
       rf_gain_rx1_(configuration->property(role + ".gain_rx1", default_manual_gain_rx1)),
       rf_gain_rx2_(configuration->property(role + ".gain_rx2", default_manual_gain_rx2)),
       scale_dds_dbfs_(configuration->property(role + ".scale_dds_dbfs", -3.0)),
@@ -71,18 +61,13 @@ Ad9361FpgaSignalSource::Ad9361FpgaSignalSource(const ConfigurationInterface *con
       freq1_(configuration->property(role + ".freq1", static_cast<uint64_t>(GPS_L5_FREQ_HZ))),
       sample_rate_(configuration->property(role + ".sampling_frequency", default_bandwidth)),
       bandwidth_(configuration->property(role + ".bandwidth", default_bandwidth)),
-      samples_to_skip_(0),
-      samples_(configuration->property(role + ".samples", static_cast<int64_t>(0))),
       freq_dds_tx_hz_(configuration->property(role + ".freq_dds_tx_hz", uint64_t(10000))),
       freq_rf_tx_hz_(configuration->property(role + ".freq_rf_tx_hz", static_cast<uint64_t>(GPS_L1_FREQ_HZ - GPS_L5_FREQ_HZ - freq_dds_tx_hz_))),
       tx_bandwidth_(configuration->property(role + ".tx_bandwidth", static_cast<uint64_t>(500000))),
       Fpass_(configuration->property(role + ".Fpass", static_cast<float>(0.0))),
       Fstop_(configuration->property(role + ".Fstop", static_cast<float>(0.0))),
-      num_input_files_(1),
-      dma_buff_offset_pos_(0),
       in_stream_(in_stream),
       out_stream_(out_stream),
-      switch_position_(configuration->property(role + ".switch_position", 0)),
       item_size_(sizeof(int8_t)),
       enable_dds_lo_(configuration->property(role + ".enable_dds_lo", false)),
       filter_auto_(configuration->property(role + ".filter_auto", false)),
@@ -91,20 +76,15 @@ Ad9361FpgaSignalSource::Ad9361FpgaSignalSource(const ConfigurationInterface *con
       bb_dc_(configuration->property(role + ".bb_dc", true)),
       rx1_enable_(configuration->property(role + ".rx1_enable", true)),
       rx2_enable_(configuration->property(role + ".rx2_enable", true)),
-      enable_DMA_(false),
       enable_dynamic_bit_selection_(configuration->property(role + ".enable_dynamic_bit_selection", true)),
-      enable_ovf_check_buffer_monitor_active_(false),
+      enable_ovf_check_buffer_monitor_active_(true),
       dump_(configuration->property(role + ".dump", false)),
 #if USE_GLOG_AND_GFLAGS
-      rf_shutdown_(configuration->property(role + ".rf_shutdown", FLAGS_rf_shutdown)),
+      rf_shutdown_(configuration->property(role + ".rf_shutdown", FLAGS_rf_shutdown))
 #else
-      rf_shutdown_(configuration->property(role + ".rf_shutdown", absl::GetFlag(FLAGS_rf_shutdown))),
+      rf_shutdown_(configuration->property(role + ".rf_shutdown", absl::GetFlag(FLAGS_rf_shutdown)))
 #endif
-      repeat_(configuration->property(role + ".repeat", false))
 {
-    const double seconds_to_skip = configuration->property(role + ".seconds_to_skip", 0.0);
-    const size_t header_size = configuration->property(role + ".header_size", 0);
-
     const bool enable_rx1_band((configuration->property("Channels_1C.count", 0) > 0) ||
                                (configuration->property("Channels_1B.count", 0) > 0));
     const bool enable_rx2_band((configuration->property("Channels_L2.count", 0) > 0) ||
@@ -126,328 +106,158 @@ Ad9361FpgaSignalSource::Ad9361FpgaSignalSource(const ConfigurationInterface *con
         {
             filter_source_ = configuration->property(role + ".filter_source", std::string("Off"));
         }
-#if USE_GLOG_AND_GFLAGS
+
-    // override value with commandline flag, if present
+    switch_fpga = std::make_shared<Fpga_Switch>();
-    if (FLAGS_signal_source != "-")
+    switch_fpga->set_switch_position(switch_to_real_time_mode);
+
+    std::cout << "Sample rate: " << sample_rate_ << " Sps\n";
+
+    // some basic checks
+    if ((rf_port_select_ != "A_BALANCED") && (rf_port_select_ != "B_BALANCED") && (rf_port_select_ != "A_N") && (rf_port_select_ != "B_N") && (rf_port_select_ != "B_P") && (rf_port_select_ != "C_N") && (rf_port_select_ != "C_P") && (rf_port_select_ != "TX_MONITOR1") && (rf_port_select_ != "TX_MONITOR2") && (rf_port_select_ != "TX_MONITOR1_2"))
         {
-            filename0_ = FLAGS_signal_source;
+            std::cout << "Configuration parameter rf_port_select should take one of these values:\n";
+            std::cout << " A_BALANCED, B_BALANCED, A_N, B_N, B_P, C_N, C_P, TX_MONITOR1, TX_MONITOR2, TX_MONITOR1_2\n";
+            std::cout << "Error: provided value rf_port_select=" << rf_port_select_ << " is not among valid values\n";
+            std::cout << " This parameter has been set to its default value rf_port_select=" << default_rf_port_select << '\n';
+            rf_port_select_ = default_rf_port_select;
+            LOG(WARNING) << "Invalid configuration value for rf_port_select parameter. Set to rf_port_select=" << default_rf_port_select;
         }
-    if (FLAGS_s != "-")
+
+    if ((gain_mode_rx1_ != "manual") && (gain_mode_rx1_ != "slow_attack") && (gain_mode_rx1_ != "fast_attack") && (gain_mode_rx1_ != "hybrid"))
         {
-            filename0_ = FLAGS_s;
+            std::cout << "Configuration parameter gain_mode_rx1 should take one of these values:\n";
+            std::cout << " manual, slow_attack, fast_attack, hybrid\n";
+            std::cout << "Error: provided value gain_mode_rx1=" << gain_mode_rx1_ << " is not among valid values\n";
+            std::cout << " This parameter has been set to its default value gain_mode_rx1=" << default_gain_mode << '\n';
+            gain_mode_rx1_ = default_gain_mode;
+            LOG(WARNING) << "Invalid configuration value for gain_mode_rx1 parameter. Set to gain_mode_rx1=" << default_gain_mode;
         }
-#else
+
-    if (absl::GetFlag(FLAGS_signal_source) != "-")
+    if ((gain_mode_rx2_ != "manual") && (gain_mode_rx2_ != "slow_attack") && (gain_mode_rx2_ != "fast_attack") && (gain_mode_rx2_ != "hybrid"))
         {
-            filename0_ = absl::GetFlag(FLAGS_signal_source);
+            std::cout << "Configuration parameter gain_mode_rx2 should take one of these values:\n";
+            std::cout << " manual, slow_attack, fast_attack, hybrid\n";
+            std::cout << "Error: provided value gain_mode_rx2=" << gain_mode_rx2_ << " is not among valid values\n";
+            std::cout << " This parameter has been set to its default value gain_mode_rx2=" << default_gain_mode << '\n';
+            gain_mode_rx2_ = default_gain_mode;
+            LOG(WARNING) << "Invalid configuration value for gain_mode_rx2 parameter. Set to gain_mode_rx2=" << default_gain_mode;
         }
-    if (absl::GetFlag(FLAGS_s) != "-")
+
+    if (gain_mode_rx1_ == "manual")
         {
-            filename0_ = absl::GetFlag(FLAGS_s);
+            if (rf_gain_rx1_ > 73.0 || rf_gain_rx1_ < -1.0)
-        }
-#endif
-    if (filename0_.empty())
-        {
-            num_input_files_ = 2;
-            filename0_ = configuration->property(role + ".filename0", empty_string);
-            filename1_ = configuration->property(role + ".filename1", empty_string);
-        }
-    // if only one input file is specified in the configuration file then:
-    // if there is at least one channel assigned to frequency band 1 then the DMA transfers the samples to the L1 frequency band channels
-    // otherwise the DMA transfers the samples to the L2/L5 frequency band channels
-    // if more than one input file are specified then the DMA transfer the samples to both the L1 and the L2/L5 frequency channels.
-    if (filename1_.empty())
-        {
-            if (enable_rx1_band)
                 {
-                    dma_buff_offset_pos_ = 2;
+                    std::cout << "Configuration parameter rf_gain_rx1 should take values between -1.0 and 73 dB\n";
+                    std::cout << "Error: provided value rf_gain_rx1=" << rf_gain_rx1_ << " is not among valid values\n";
+                    std::cout << " This parameter has been set to its default value rf_gain_rx1=" << default_manual_gain_rx1 << '\n';
+                    rf_gain_rx1_ = default_manual_gain_rx1;
+                    LOG(WARNING) << "Invalid configuration value for rf_gain_rx1 parameter. Set to rf_gain_rx1=" << default_manual_gain_rx1;
                 }
         }
-    else
+
+    if (gain_mode_rx2_ == "manual")
         {
-            dma_buff_offset_pos_ = 2;
+            if (rf_gain_rx2_ > 73.0 || rf_gain_rx2_ < -1.0)
+                {
+                    std::cout << "Configuration parameter rf_gain_rx2 should take values between -1.0 and 73 dB\n";
+                    std::cout << "Error: provided value rf_gain_rx2=" << rf_gain_rx2_ << " is not among valid values\n";
+                    std::cout << " This parameter has been set to its default value rf_gain_rx2=" << default_manual_gain_rx2 << '\n';
+                    rf_gain_rx2_ = default_manual_gain_rx2;
+                    LOG(WARNING) << "Invalid configuration value for rf_gain_rx2 parameter. Set to rf_gain_rx2=" << default_manual_gain_rx2;
+                }
         }
 
-    if (seconds_to_skip > 0)
+    if ((filter_source_ != "Off") && (filter_source_ != "Auto") && (filter_source_ != "File") && (filter_source_ != "Design"))
         {
-            samples_to_skip_ = static_cast<uint64_t>(seconds_to_skip * sample_rate_) * 2;
+            std::cout << "Configuration parameter filter_source should take one of these values:\n";
-        }
+            std::cout << "  Off: Disable filter\n";
-    if (header_size > 0)
+            std::cout << "  Auto: Use auto-generated filters\n";
-        {
+            std::cout << "  File: User-provided filter in filter_filename parameter\n";
-            samples_to_skip_ += header_size;
+            std::cout << "  Design: Create filter from Fpass, Fstop, sampling_frequency and bandwidth parameters\n";
+            std::cout << "Error: provided value filter_source=" << filter_source_ << " is not among valid values\n";
+            std::cout << " This parameter has been set to its default value filter_source=Off\n";
+            filter_source_ = std::string("Off");
+            LOG(WARNING) << "Invalid configuration value for filter_source parameter. Set to filter_source=Off";
         }
 
-    std::string device_io_name;  // Switch UIO device file
+    if (bandwidth_ < 200000 || bandwidth_ > 56000000)
-    // find the uio device file corresponding to the switch.
-    if (find_uio_dev_file_name(device_io_name, switch_device_name, 0) < 0)
         {
-            std::cerr << "Cannot find the FPGA uio device file corresponding to device name " << switch_device_name << '\n';
+            std::cout << "Configuration parameter bandwidth should take values between 200000 and 56000000 Hz\n";
+            std::cout << "Error: provided value bandwidth=" << bandwidth_ << " is not among valid values\n";
+            std::cout << " This parameter has been set to its default value bandwidth=" << default_bandwidth << '\n';
+            bandwidth_ = default_bandwidth;
+            LOG(WARNING) << "Invalid configuration value for bandwidth parameter. Set to bandwidth=" << default_bandwidth;
+        }
+
+    std::cout << "LO frequency : " << freq0_ << " Hz\n";
+    try
+        {
+            config_ad9361_rx_local(bandwidth_,
+                sample_rate_,
+                freq0_,
+                freq1_,
+                rf_port_select_,
+                rx1_enable_,
+                rx2_enable_,
+                gain_mode_rx1_,
+                gain_mode_rx2_,
+                rf_gain_rx1_,
+                rf_gain_rx2_,
+                quadrature_,
+                rf_dc_,
+                bb_dc_,
+                filter_source_,
+                filter_filename_,
+                Fpass_,
+                Fstop_);
+        }
+    catch (const std::runtime_error &e)
+        {
+            std::cerr << "Exception cached when configuring the RX chain: " << e.what() << '\n';
             return;
         }
-
+    // LOCAL OSCILLATOR DDS GENERATOR FOR DUAL FREQUENCY OPERATION
-    if (switch_position_ != 0 && switch_position_ != 2)
+    if (enable_dds_lo_ == true)
         {
-            std::cout << "SignalSource.switch_position configuration parameter must be either 0: read from file(s) via DMA, or 2: read from AD9361\n";
+            if (tx_bandwidth_ < static_cast<uint64_t>(std::floor(static_cast<float>(freq_dds_tx_hz_) * 1.1)) || (tx_bandwidth_ < 200000) || (tx_bandwidth_ > 1000000))
-            std::cout << "SignalSource.switch_position configuration parameter set to its default value switch_position=0 - read from file(s)\n";
-            switch_position_ = 0;
-        }
-
-    switch_fpga = std::make_shared<Fpga_Switch>(device_io_name);
-    switch_fpga->set_switch_position(switch_position_);
-
-    if (switch_position_ == 0)  // Inject file(s) via DMA
-        {
-            enable_DMA_ = true;
-
-            if (samples_ == 0)  // read all file
                 {
-                    /*!
+                    std::cout << "Configuration parameter tx_bandwidth value should be between " << std::max(static_cast<float>(freq_dds_tx_hz_) * 1.1, 200000.0) << " and 1000000 Hz\n";
-                     * BUG workaround: The GNU Radio file source does not stop the receiver after reaching the End of File.
+                    std::cout << "Error: provided value tx_bandwidth=" << tx_bandwidth_ << " is not among valid values\n";
-                     * A possible solution is to compute the file length in samples using file size, excluding the last 100 milliseconds, and enable always the
+                    std::cout << " This parameter has been set to its default value tx_bandwidth=500000\n";
-                     * valve block
+                    tx_bandwidth_ = 500000;
-                     */
+                    LOG(WARNING) << "Invalid configuration value for tx_bandwidth parameter. Set to tx_bandwidth=500000";
-                    std::ifstream file(filename0_.c_str(), std::ios::in | std::ios::binary | std::ios::ate);
-                    std::ifstream::pos_type size;
-
-                    if (file.is_open())
-                        {
-                            size = file.tellg();
-                            DLOG(INFO) << "Total samples in the file= " << floor(static_cast<double>(size) / static_cast<double>(item_size_));
-                        }
-                    else
-                        {
-                            std::cerr << "SignalSource: Unable to open the samples file " << filename0_.c_str() << '\n';
-                            return;
-                        }
-                    std::streamsize ss = std::cout.precision();
-                    std::cout << std::setprecision(16);
-                    std::cout << "Processing file " << filename0_ << ", which contains " << static_cast<double>(size) << " [bytes]\n";
-                    std::cout.precision(ss);
-
-                    if (size > 0)
-                        {
-                            const uint64_t bytes_to_skip = samples_to_skip_ * item_size_;
-                            const uint64_t bytes_to_process = static_cast<uint64_t>(size) - bytes_to_skip;
-                            samples_ = floor(static_cast<double>(bytes_to_process) / static_cast<double>(item_size_) - ceil(0.002 * static_cast<double>(sample_rate_)));  // process all the samples available in the file excluding at least the last 1 ms
-                        }
-
-                    if (!filename1_.empty())
-                        {
-                            std::ifstream file(filename1_.c_str(), std::ios::in | std::ios::binary | std::ios::ate);
-                            std::ifstream::pos_type size;
-
-                            if (file.is_open())
-                                {
-                                    size = file.tellg();
-                                    DLOG(INFO) << "Total samples in the file= " << floor(static_cast<double>(size) / static_cast<double>(item_size_));
-                                }
-                            else
-                                {
-                                    std::cerr << "SignalSource: Unable to open the samples file " << filename1_.c_str() << '\n';
-                                    return;
-                                }
-                            std::streamsize ss = std::cout.precision();
-                            std::cout << std::setprecision(16);
-                            std::cout << "Processing file " << filename1_ << ", which contains " << static_cast<double>(size) << " [bytes]\n";
-                            std::cout.precision(ss);
-
-                            int64_t samples_rx2 = 0;
-                            if (size > 0)
-                                {
-                                    const uint64_t bytes_to_skip = samples_to_skip_ * item_size_;
-                                    const uint64_t bytes_to_process = static_cast<uint64_t>(size) - bytes_to_skip;
-                                    samples_rx2 = floor(static_cast<double>(bytes_to_process) / static_cast<double>(item_size_) - ceil(0.002 * static_cast<double>(sample_rate_)));  // process all the samples available in the file excluding at least the last 1 ms
-                                }
-                            samples_ = std::min(samples_, samples_rx2);
-                        }
                 }
-
+            if (tx_attenuation_db_ > 0.0 || tx_attenuation_db_ < -89.75)
-            CHECK(samples_ > 0) << "File does not contain enough samples to process.";
-            double signal_duration_s = (static_cast<double>(samples_) * (1 / static_cast<double>(sample_rate_))) / 2.0;
-
-            DLOG(INFO) << "Total number samples to be processed= " << samples_ << " GNSS signal duration= " << signal_duration_s << " [s]";
-            std::cout << "GNSS signal recorded time to be processed: " << signal_duration_s << " [s]\n";
-
-            if (filename1_.empty())
                 {
-                    DLOG(INFO) << "File source filename " << filename0_;
+                    std::cout << "Configuration parameter tx_attenuation_db should take values between 0.0 and -89.95 in 0.25 dB steps\n";
+                    std::cout << "Error: provided value tx_attenuation_db=" << tx_attenuation_db_ << " is not among valid values\n";
+                    std::cout << " This parameter has been set to its default value tx_attenuation_db=" << default_tx_attenuation_db << '\n';
+                    tx_attenuation_db_ = default_tx_attenuation_db;
+                    LOG(WARNING) << "Invalid configuration value for tx_attenuation_db parameter. Set to tx_attenuation_db=" << default_tx_attenuation_db;
                 }
-            else
-                {
-                    DLOG(INFO) << "File source filename rx1 " << filename0_;
-                    DLOG(INFO) << "File source filename rx2 " << filename1_;
-                }
-            DLOG(INFO) << "Samples " << samples_;
-            DLOG(INFO) << "Sampling frequency " << sample_rate_;
-            DLOG(INFO) << "Item type " << std::string("ibyte");
-            DLOG(INFO) << "Item size " << item_size_;
-            DLOG(INFO) << "Repeat " << repeat_;
-        }
-    if (switch_position_ == 2)  // Real-time via AD9361
-        {
-            std::cout << "Sample rate: " << sample_rate_ << " Sps\n";
-
-            enable_ovf_check_buffer_monitor_active_ = false;  // check buffer overflow and buffer monitor disabled by default
-
-            // some basic checks
-            if ((rf_port_select_ != "A_BALANCED") && (rf_port_select_ != "B_BALANCED") && (rf_port_select_ != "A_N") && (rf_port_select_ != "B_N") && (rf_port_select_ != "B_P") && (rf_port_select_ != "C_N") && (rf_port_select_ != "C_P") && (rf_port_select_ != "TX_MONITOR1") && (rf_port_select_ != "TX_MONITOR2") && (rf_port_select_ != "TX_MONITOR1_2"))
-                {
-                    std::cout << "Configuration parameter rf_port_select should take one of these values:\n";
-                    std::cout << " A_BALANCED, B_BALANCED, A_N, B_N, B_P, C_N, C_P, TX_MONITOR1, TX_MONITOR2, TX_MONITOR1_2\n";
-                    std::cout << "Error: provided value rf_port_select=" << rf_port_select_ << " is not among valid values\n";
-                    std::cout << " This parameter has been set to its default value rf_port_select=" << default_rf_port_select << '\n';
-                    rf_port_select_ = default_rf_port_select;
-                    LOG(WARNING) << "Invalid configuration value for rf_port_select parameter. Set to rf_port_select=" << default_rf_port_select;
-                }
-
-            if ((gain_mode_rx1_ != "manual") && (gain_mode_rx1_ != "slow_attack") && (gain_mode_rx1_ != "fast_attack") && (gain_mode_rx1_ != "hybrid"))
-                {
-                    std::cout << "Configuration parameter gain_mode_rx1 should take one of these values:\n";
-                    std::cout << " manual, slow_attack, fast_attack, hybrid\n";
-                    std::cout << "Error: provided value gain_mode_rx1=" << gain_mode_rx1_ << " is not among valid values\n";
-                    std::cout << " This parameter has been set to its default value gain_mode_rx1=" << default_gain_mode << '\n';
-                    gain_mode_rx1_ = default_gain_mode;
-                    LOG(WARNING) << "Invalid configuration value for gain_mode_rx1 parameter. Set to gain_mode_rx1=" << default_gain_mode;
-                }
-
-            if ((gain_mode_rx2_ != "manual") && (gain_mode_rx2_ != "slow_attack") && (gain_mode_rx2_ != "fast_attack") && (gain_mode_rx2_ != "hybrid"))
-                {
-                    std::cout << "Configuration parameter gain_mode_rx2 should take one of these values:\n";
-                    std::cout << " manual, slow_attack, fast_attack, hybrid\n";
-                    std::cout << "Error: provided value gain_mode_rx2=" << gain_mode_rx2_ << " is not among valid values\n";
-                    std::cout << " This parameter has been set to its default value gain_mode_rx2=" << default_gain_mode << '\n';
-                    gain_mode_rx2_ = default_gain_mode;
-                    LOG(WARNING) << "Invalid configuration value for gain_mode_rx2 parameter. Set to gain_mode_rx2=" << default_gain_mode;
-                }
-
-            if (gain_mode_rx1_ == "manual")
-                {
-                    if (rf_gain_rx1_ > 73.0 || rf_gain_rx1_ < -1.0)
-                        {
-                            std::cout << "Configuration parameter rf_gain_rx1 should take values between -1.0 and 73 dB\n";
-                            std::cout << "Error: provided value rf_gain_rx1=" << rf_gain_rx1_ << " is not among valid values\n";
-                            std::cout << " This parameter has been set to its default value rf_gain_rx1=" << default_manual_gain_rx1 << '\n';
-                            rf_gain_rx1_ = default_manual_gain_rx1;
-                            LOG(WARNING) << "Invalid configuration value for rf_gain_rx1 parameter. Set to rf_gain_rx1=" << default_manual_gain_rx1;
-                        }
-                }
-
-            if (gain_mode_rx2_ == "manual")
-                {
-                    if (rf_gain_rx2_ > 73.0 || rf_gain_rx2_ < -1.0)
-                        {
-                            std::cout << "Configuration parameter rf_gain_rx2 should take values between -1.0 and 73 dB\n";
-                            std::cout << "Error: provided value rf_gain_rx2=" << rf_gain_rx2_ << " is not among valid values\n";
-                            std::cout << " This parameter has been set to its default value rf_gain_rx2=" << default_manual_gain_rx2 << '\n';
-                            rf_gain_rx2_ = default_manual_gain_rx2;
-                            LOG(WARNING) << "Invalid configuration value for rf_gain_rx2 parameter. Set to rf_gain_rx2=" << default_manual_gain_rx2;
-                        }
-                }
-
-            if ((filter_source_ != "Off") && (filter_source_ != "Auto") && (filter_source_ != "File") && (filter_source_ != "Design"))
-                {
-                    std::cout << "Configuration parameter filter_source should take one of these values:\n";
-                    std::cout << "  Off: Disable filter\n";
-                    std::cout << "  Auto: Use auto-generated filters\n";
-                    std::cout << "  File: User-provided filter in filter_filename parameter\n";
-                    std::cout << "  Design: Create filter from Fpass, Fstop, sampling_frequency and bandwidth parameters\n";
-                    std::cout << "Error: provided value filter_source=" << filter_source_ << " is not among valid values\n";
-                    std::cout << " This parameter has been set to its default value filter_source=Off\n";
-                    filter_source_ = std::string("Off");
-                    LOG(WARNING) << "Invalid configuration value for filter_source parameter. Set to filter_source=Off";
-                }
-
-            if (bandwidth_ < 200000 || bandwidth_ > 56000000)
-                {
-                    std::cout << "Configuration parameter bandwidth should take values between 200000 and 56000000 Hz\n";
-                    std::cout << "Error: provided value bandwidth=" << bandwidth_ << " is not among valid values\n";
-                    std::cout << " This parameter has been set to its default value bandwidth=" << default_bandwidth << '\n';
-                    bandwidth_ = default_bandwidth;
-                    LOG(WARNING) << "Invalid configuration value for bandwidth parameter. Set to bandwidth=" << default_bandwidth;
-                }
-
-            std::cout << "LO frequency : " << freq0_ << " Hz\n";
             try
                 {
-                    config_ad9361_rx_local(bandwidth_,
+                    config_ad9361_lo_local(tx_bandwidth_,
                         sample_rate_,
-                        freq0_,
+                        freq_rf_tx_hz_,
-                        freq1_,
+                        tx_attenuation_db_,
-                        rf_port_select_,
+                        freq_dds_tx_hz_,
-                        rx1_enable_,
+                        scale_dds_dbfs_,
-                        rx2_enable_,
+                        phase_dds_deg_);
-                        gain_mode_rx1_,
-                        gain_mode_rx2_,
-                        rf_gain_rx1_,
-                        rf_gain_rx2_,
-                        quadrature_,
-                        rf_dc_,
-                        bb_dc_,
-                        filter_source_,
-                        filter_filename_,
-                        Fpass_,
-                        Fstop_);
                 }
             catch (const std::runtime_error &e)
                 {
-                    std::cerr << "Exception cached when configuring the RX chain: " << e.what() << '\n';
+                    std::cerr << "Exception cached when configuring the TX carrier: " << e.what() << '\n';
                     return;
                 }
-            // LOCAL OSCILLATOR DDS GENERATOR FOR DUAL FREQUENCY OPERATION
-            if (enable_dds_lo_ == true)
-                {
-                    if (tx_bandwidth_ < static_cast<uint64_t>(std::floor(static_cast<float>(freq_dds_tx_hz_) * 1.1)) || (tx_bandwidth_ < 200000) || (tx_bandwidth_ > 1000000))
-                        {
-                            std::cout << "Configuration parameter tx_bandwidth value should be between " << std::max(static_cast<float>(freq_dds_tx_hz_) * 1.1, 200000.0) << " and 1000000 Hz\n";
-                            std::cout << "Error: provided value tx_bandwidth=" << tx_bandwidth_ << " is not among valid values\n";
-                            std::cout << " This parameter has been set to its default value tx_bandwidth=500000\n";
-                            tx_bandwidth_ = 500000;
-                            LOG(WARNING) << "Invalid configuration value for tx_bandwidth parameter. Set to tx_bandwidth=500000";
-                        }
-                    if (tx_attenuation_db_ > 0.0 || tx_attenuation_db_ < -89.75)
-                        {
-                            std::cout << "Configuration parameter tx_attenuation_db should take values between 0.0 and -89.95 in 0.25 dB steps\n";
-                            std::cout << "Error: provided value tx_attenuation_db=" << tx_attenuation_db_ << " is not among valid values\n";
-                            std::cout << " This parameter has been set to its default value tx_attenuation_db=" << default_tx_attenuation_db << '\n';
-                            tx_attenuation_db_ = default_tx_attenuation_db;
-                            LOG(WARNING) << "Invalid configuration value for tx_attenuation_db parameter. Set to tx_attenuation_db=" << default_tx_attenuation_db;
-                        }
-                    try
-                        {
-                            config_ad9361_lo_local(tx_bandwidth_,
-                                sample_rate_,
-                                freq_rf_tx_hz_,
-                                tx_attenuation_db_,
-                                freq_dds_tx_hz_,
-                                scale_dds_dbfs_,
-                                phase_dds_deg_);
-                        }
-                    catch (const std::runtime_error &e)
-                        {
-                            std::cerr << "Exception cached when configuring the TX carrier: " << e.what() << '\n';
-                            return;
-                        }
-                }
-
-            // when the receiver is working in real-time mode via AD9361 perform buffer overflow checking,
-            // and if dump is enabled perform buffer monitoring
-            enable_ovf_check_buffer_monitor_active_ = true;
-
-            std::string device_io_name_buffer_monitor;
-
-            std::string dump_filename = configuration->property(role + ".dump_filename", default_dump_filename);
-
-            // find the uio device file corresponding to the buffer monitor
-            if (find_uio_dev_file_name(device_io_name_buffer_monitor, buffer_monitor_device_name, 0) < 0)
-                {
-                    std::cerr << "Cannot find the FPGA uio device file corresponding to device name " << buffer_monitor_device_name << '\n';
-                    return;
-                }
-
-            buffer_monitor_fpga = std::make_shared<Fpga_buffer_monitor>(device_io_name_buffer_monitor, num_freq_bands, dump_, dump_filename);
-            thread_buffer_monitor = std::thread([&] { run_buffer_monitor_process(); });
         }
 
+    std::string dump_filename = configuration->property(role + ".dump_filename", default_dump_filename);
+
+    buffer_monitor_fpga = std::make_shared<Fpga_buffer_monitor>(num_freq_bands, dump_, dump_filename);
+    thread_buffer_monitor = std::thread([&] { run_buffer_monitor_process(); });
+
+
     // dynamic bits selection
     if (enable_dynamic_bit_selection_)
         {
@@ -469,53 +279,40 @@ Ad9361FpgaSignalSource::Ad9361FpgaSignalSource(const ConfigurationInterface *con
 Ad9361FpgaSignalSource::~Ad9361FpgaSignalSource()
 {
     /* cleanup and exit */
-    if (switch_position_ == 0)  // read samples from a file via DMA
+
+    if (rf_shutdown_)
         {
-            std::unique_lock<std::mutex> lock(dma_mutex);
+            std::cout << "* AD9361 Disabling RX streaming channels\n";
-            enable_DMA_ = false;  // disable the DMA
+            if (!disable_ad9361_rx_local())
-            lock.unlock();
-            if (thread_file_to_dma.joinable())
                 {
-                    thread_file_to_dma.join();
+                    LOG(WARNING) << "Problem shutting down the AD9361 RX channels";
+                }
+            if (enable_dds_lo_)
+                {
+                    try
+                        {
+                            ad9361_disable_lo_local();
+                        }
+                    catch (const std::exception &e)
+                        {
+                            LOG(WARNING) << "Problem shutting down the AD9361 TX stream: " << e.what();
+                        }
                 }
         }
 
-    if (switch_position_ == 2)  // Real-time via AD9361
+    // disable buffer overflow checking and buffer monitoring
+    std::unique_lock<std::mutex> lock_buffer_monitor(buffer_monitor_mutex);
+    enable_ovf_check_buffer_monitor_active_ = false;
+    lock_buffer_monitor.unlock();
+
+    if (thread_buffer_monitor.joinable())
         {
-            if (rf_shutdown_)
+            thread_buffer_monitor.join();
-                {
-                    std::cout << "* AD9361 Disabling RX streaming channels\n";
-                    if (!disable_ad9361_rx_local())
-                        {
-                            LOG(WARNING) << "Problem shutting down the AD9361 RX channels";
-                        }
-                    if (enable_dds_lo_)
-                        {
-                            try
-                                {
-                                    ad9361_disable_lo_local();
-                                }
-                            catch (const std::exception &e)
-                                {
-                                    LOG(WARNING) << "Problem shutting down the AD9361 TX stream: " << e.what();
-                                }
-                        }
-                }
-
-            // disable buffer overflow checking and buffer monitoring
-            std::unique_lock<std::mutex> lock(buffer_monitor_mutex);
-            enable_ovf_check_buffer_monitor_active_ = false;
-            lock.unlock();
-
-            if (thread_buffer_monitor.joinable())
-                {
-                    thread_buffer_monitor.join();
-                }
         }
 
-    std::unique_lock<std::mutex> lock(dynamic_bit_selection_mutex);
+    std::unique_lock<std::mutex> lock_dyn_bit_sel(dynamic_bit_selection_mutex);
     bool bit_selection_enabled = enable_dynamic_bit_selection_;
-    lock.unlock();
+    lock_dyn_bit_sel.unlock();
 
     if (bit_selection_enabled == true)
         {
@@ -531,290 +328,6 @@ Ad9361FpgaSignalSource::~Ad9361FpgaSignalSource()
 }
 
 
-void Ad9361FpgaSignalSource::start()
-{
-    thread_file_to_dma = std::thread([&] { run_DMA_process(filename0_, filename1_, samples_to_skip_, item_size_, samples_, repeat_, dma_buff_offset_pos_, queue_); });
-}
-
-
-void Ad9361FpgaSignalSource::run_DMA_process(const std::string &filename0_, const std::string &filename1_, uint64_t &samples_to_skip, size_t &item_size, int64_t &samples, bool &repeat, uint32_t &dma_buff_offset_pos, Concurrent_Queue<pmt::pmt_t> *queue)
-{
-    std::ifstream infile1;
-    infile1.exceptions(std::ifstream::failbit | std::ifstream::badbit);
-
-
-    // FPGA DMA control
-    dma_fpga = std::make_shared<Fpga_DMA>();
-
-    // open the files
-    try
-        {
-            infile1.open(filename0_, std::ios::binary);
-        }
-    catch (const std::ifstream::failure &e)
-        {
-            std::cerr << "Exception opening file " << filename0_ << '\n';
-            // stop the receiver
-            queue->push(pmt::make_any(command_event_make(200, 0)));
-            return;
-        }
-
-    std::ifstream infile2;
-    if (!filename1_.empty())
-        {
-            infile2.exceptions(std::ifstream::failbit | std::ifstream::badbit);
-            try
-                {
-                    infile2.open(filename1_, std::ios::binary);
-                }
-            catch (const std::ifstream::failure &e)
-                {
-                    std::cerr << "Exception opening file " << filename1_ << '\n';
-                    // stop the receiver
-                    queue->push(pmt::make_any(command_event_make(200, 0)));
-                    return;
-                }
-        }
-
-    // skip the initial samples if needed
-    uint64_t bytes_to_skeep = samples_to_skip * item_size;
-    try
-        {
-            infile1.ignore(bytes_to_skeep);
-        }
-    catch (const std::ifstream::failure &e)
-        {
-            std::cerr << "Exception skipping initial samples file " << filename0_ << '\n';
-            // stop the receiver
-            queue->push(pmt::make_any(command_event_make(200, 0)));
-            return;
-        }
-
-    if (!filename1_.empty())
-        {
-            try
-                {
-                    infile2.ignore(bytes_to_skeep);
-                }
-            catch (const std::ifstream::failure &e)
-                {
-                    std::cerr << "Exception skipping initial samples file " << filename1_ << '\n';
-                    // stop the receiver
-                    queue->push(pmt::make_any(command_event_make(200, 0)));
-                    return;
-                }
-        }
-
-    // rx signal vectors
-    std::vector<int8_t> input_samples(sample_block_size * 2);  // complex samples
-    // pointer to DMA buffer
-    int8_t *dma_buffer;
-    int nread_elements = 0;  // num bytes read from the file corresponding to frequency band 1
-    bool run_DMA = true;
-
-    // Open DMA device
-    if (dma_fpga->DMA_open())
-        {
-            std::cerr << "Cannot open loop device\n";
-            // stop the receiver
-            queue->push(pmt::make_any(command_event_make(200, 0)));
-            return;
-        }
-    dma_buffer = dma_fpga->get_buffer_address();
-
-    // if only one frequency band is used then clear the samples corresponding to the unused frequency band
-    uint32_t dma_index = 0;
-    if (num_input_files_ == 1)
-        {
-            // if only one file is enabled then clear the samples corresponding to the frequency band that is not used.
-            for (int index0 = 0; index0 < (nread_elements); index0 += 2)
-                {
-                    dma_buffer[dma_index + (2 - dma_buff_offset_pos)] = 0;
-                    dma_buffer[dma_index + 1 + (2 - dma_buff_offset_pos)] = 0;
-                    dma_index += 4;
-                }
-        }
-
-    uint64_t nbytes_remaining = samples * item_size;
-    uint32_t read_buffer_size = sample_block_size * 2;  // complex samples
-
-    // run the DMA
-    while (run_DMA)
-        {
-            dma_index = 0;
-            if (nbytes_remaining < read_buffer_size)
-                {
-                    read_buffer_size = nbytes_remaining;
-                }
-            nbytes_remaining = nbytes_remaining - read_buffer_size;
-
-            // read filename 0
-            try
-                {
-                    infile1.read(reinterpret_cast<char *>(input_samples.data()), read_buffer_size);
-                }
-            catch (const std::ifstream::failure &e)
-                {
-                    std::cerr << "Exception reading file " << filename0_ << '\n';
-                    break;
-                }
-            if (infile1)
-                {
-                    nread_elements = read_buffer_size;
-                }
-            else
-                {
-                    // FLAG AS ERROR !! IT SHOULD NEVER HAPPEN
-                    nread_elements = infile1.gcount();
-                }
-
-            for (int index0 = 0; index0 < (nread_elements); index0 += 2)
-                {
-                    // dma_buff_offset_pos is 1 for the L1 band and 0 for the other bands
-                    dma_buffer[dma_index + dma_buff_offset_pos] = input_samples[index0];
-                    dma_buffer[dma_index + 1 + dma_buff_offset_pos] = input_samples[index0 + 1];
-                    dma_index += 4;
-                }
-
-            // read filename 1 (if enabled)
-            if (num_input_files_ > 1)
-                {
-                    dma_index = 0;
-                    try
-                        {
-                            infile2.read(reinterpret_cast<char *>(input_samples.data()), read_buffer_size);
-                        }
-                    catch (const std::ifstream::failure &e)
-                        {
-                            std::cerr << "Exception reading file " << filename1_ << '\n';
-                            break;
-                        }
-                    if (infile2)
-                        {
-                            nread_elements = read_buffer_size;
-                        }
-                    else
-                        {
-                            // FLAG AS ERROR !! IT SHOULD NEVER HAPPEN
-                            nread_elements = infile2.gcount();
-                        }
-
-                    for (int index0 = 0; index0 < (nread_elements); index0 += 2)
-                        {
-                            // filename2 is never the L1 band
-                            dma_buffer[dma_index] = input_samples[index0];
-                            dma_buffer[dma_index + 1] = input_samples[index0 + 1];
-                            dma_index += 4;
-                        }
-                }
-
-            if (nread_elements > 0)
-                {
-                    if (dma_fpga->DMA_write(nread_elements * 2))
-                        {
-                            std::cerr << "Error: DMA could not send all the required samples\n";
-                            break;
-                        }
-                    // Throttle the DMA
-                    std::this_thread::sleep_for(std::chrono::milliseconds(1));
-                }
-
-            if (nbytes_remaining == 0)
-                {
-                    if (repeat)
-                        {
-                            // read the file again
-                            nbytes_remaining = samples * item_size;
-                            read_buffer_size = sample_block_size * 2;
-                            try
-                                {
-                                    infile1.seekg(0);
-                                }
-                            catch (const std::ifstream::failure &e)
-                                {
-                                    std::cerr << "Exception resetting the position of the next byte to be extracted to zero " << filename0_ << '\n';
-                                    break;
-                                }
-
-                            // skip the initial samples if needed
-                            uint64_t bytes_to_skeep = samples_to_skip * item_size;
-                            try
-                                {
-                                    infile1.ignore(bytes_to_skeep);
-                                }
-                            catch (const std::ifstream::failure &e)
-                                {
-                                    std::cerr << "Exception skipping initial samples file " << filename0_ << '\n';
-                                    break;
-                                }
-
-                            if (!filename1_.empty())
-                                {
-                                    try
-                                        {
-                                            infile2.seekg(0);
-                                        }
-                                    catch (const std::ifstream::failure &e)
-                                        {
-                                            std::cerr << "Exception setting the position of the next byte to be extracted to zero " << filename1_ << '\n';
-                                            break;
-                                        }
-
-                                    try
-                                        {
-                                            infile2.ignore(bytes_to_skeep);
-                                        }
-                                    catch (const std::ifstream::failure &e)
-                                        {
-                                            std::cerr << "Exception skipping initial samples file " << filename1_ << '\n';
-                                            break;
-                                        }
-                                }
-                        }
-                    else
-                        {
-                            // the input file is completely processed. Stop the receiver.
-                            run_DMA = false;
-                        }
-                }
-            std::unique_lock<std::mutex> lock(dma_mutex);
-            if (enable_DMA_ == false)
-                {
-                    run_DMA = false;
-                }
-            lock.unlock();
-        }
-
-    if (dma_fpga->DMA_close())
-        {
-            std::cerr << "Error closing loop device " << '\n';
-        }
-    try
-        {
-            infile1.close();
-        }
-    catch (const std::ifstream::failure &e)
-        {
-            std::cerr << "Exception closing file " << filename0_ << '\n';
-        }
-
-    if (num_input_files_ > 1)
-        {
-            try
-                {
-                    infile2.close();
-                }
-            catch (const std::ifstream::failure &e)
-                {
-                    std::cerr << "Exception closing file " << filename1_ << '\n';
-                }
-        }
-
-    // Stop the receiver
-    queue->push(pmt::make_any(command_event_make(200, 0)));
-}
-
-
 void Ad9361FpgaSignalSource::run_dynamic_bit_selection_process()
 {
     bool dynamic_bit_selection_active = true;

src/algorithms/signal_source/adapters/ad9361_fpga_signal_source.h

@@ -53,8 +53,6 @@ public:
 
     ~Ad9361FpgaSignalSource();
 
-    void start() override;
-
     inline size_t item_size() override
     {
         return item_size_;
@@ -66,13 +64,9 @@ public:
     gr::basic_block_sptr get_right_block() override;
 
 private:
-    const std::string switch_device_name = std::string("AXIS_Switch_v1_0_0");          // Switch UIO device name
-    const std::string dyn_bit_sel_device_name = std::string("dynamic_bits_selector");  // Switch dhnamic bit selector device name
-    const std::string buffer_monitor_device_name = std::string("buffer_monitor");      // buffer monitor device name
     const std::string default_dump_filename = std::string("FPGA_buffer_monitor_dump.dat");
     const std::string default_rf_port_select = std::string("A_BALANCED");
     const std::string default_gain_mode = std::string("slow_attack");
-    const std::string empty_string;
     const double default_tx_attenuation_db = -10.0;
     const double default_manual_gain_rx1 = 64.0;
     const double default_manual_gain_rx2 = 64.0;
@@ -86,42 +80,27 @@ private:
     const uint32_t buffer_monitoring_initial_delay_ms = 2000;
     // sample block size when running in post-processing mode
     const int sample_block_size = 16384;
-
+    const int32_t switch_to_real_time_mode = 2;
-    void run_DMA_process(const std::string &filename0,
-        const std::string &filename1,
-        uint64_t &samples_to_skip,
-        size_t &item_size,
-        int64_t &samples,
-        bool &repeat,
-        uint32_t &dma_buff_offset_pos,
-        Concurrent_Queue<pmt::pmt_t> *queue);
 
     void run_dynamic_bit_selection_process();
     void run_buffer_monitor_process();
 
-    std::thread thread_file_to_dma;
     std::thread thread_dynamic_bit_selection;
     std::thread thread_buffer_monitor;
 
     std::shared_ptr<Fpga_Switch> switch_fpga;
     std::shared_ptr<Fpga_dynamic_bit_selection> dynamic_bit_selection_fpga;
     std::shared_ptr<Fpga_buffer_monitor> buffer_monitor_fpga;
-    std::shared_ptr<Fpga_DMA> dma_fpga;
 
-    std::mutex dma_mutex;
     std::mutex dynamic_bit_selection_mutex;
     std::mutex buffer_monitor_mutex;
 
-    Concurrent_Queue<pmt::pmt_t> *queue_;
-
     std::string gain_mode_rx1_;
     std::string gain_mode_rx2_;
     std::string rf_port_select_;
     std::string filter_file_;
     std::string filter_source_;
     std::string filter_filename_;
-    std::string filename0_;
-    std::string filename1_;
 
     double rf_gain_rx1_;
     double rf_gain_rx2_;
@@ -133,19 +112,14 @@ private:
     uint64_t freq1_;  // frequency of local oscillator for ADRV9361-B (if present)
     uint64_t sample_rate_;
     uint64_t bandwidth_;
-    uint64_t samples_to_skip_;
-    int64_t samples_;
     uint64_t freq_dds_tx_hz_;
     uint64_t freq_rf_tx_hz_;
     uint64_t tx_bandwidth_;
 
     float Fpass_;
     float Fstop_;
-    uint32_t num_input_files_;
-    uint32_t dma_buff_offset_pos_;
     uint32_t in_stream_;
     uint32_t out_stream_;
-    int32_t switch_position_;
 
     size_t item_size_;
 
@@ -156,12 +130,10 @@ private:
     bool bb_dc_;
     bool rx1_enable_;
     bool rx2_enable_;
-    bool enable_DMA_;
     bool enable_dynamic_bit_selection_;
     bool enable_ovf_check_buffer_monitor_active_;
     bool dump_;
     bool rf_shutdown_;
-    bool repeat_;
 };
 
 

src/algorithms/signal_source/adapters/dma_fpga_signal_source.cc

@@ -0,0 +1,585 @@
+/*!
+ * \file dma_fpga_signal_source.cc
+ * \brief signal source for a DMA connected directly to FPGA accelerators.
+ * This source implements only the DMA control. It is NOT compatible with
+ * conventional SDR acquisition and tracking blocks.
+ * \author Marc Majoral, mmajoral(at)cttc.es
+ *
+ * -----------------------------------------------------------------------------
+ *
+ * GNSS-SDR is a Global Navigation Satellite System software-defined receiver.
+ * This file is part of GNSS-SDR.
+ *
+ * Copyright (C) 2010-2024  (see AUTHORS file for a list of contributors)
+ * SPDX-License-Identifier: GPL-3.0-or-later
+ *
+ * -----------------------------------------------------------------------------
+ */
+
+#include "dma_fpga_signal_source.h"
+#include "command_event.h"
+#include "configuration_interface.h"
+#include "gnss_sdr_flags.h"
+#include "gnss_sdr_string_literals.h"
+#include <chrono>    // for std::chrono
+#include <fcntl.h>   // for open, O_WRONLY
+#include <fstream>   // for std::ifstream
+#include <iomanip>   // for std::setprecision
+#include <iostream>  // for std::cout
+#include <vector>    // fr std::vector
+
+#if USE_GLOG_AND_GFLAGS
+#include <glog/logging.h>
+#else
+#include <absl/log/check.h>
+#include <absl/log/log.h>
+#endif
+
+using namespace std::string_literals;
+
+DMAFpgaSignalSource::DMAFpgaSignalSource(const ConfigurationInterface *configuration,
+    const std::string &role, unsigned int in_stream, unsigned int out_stream,
+    Concurrent_Queue<pmt::pmt_t> *queue __attribute__((unused)))
+    : SignalSourceBase(configuration, role, "DMA_Fpga_Signal_Source"s),
+      queue_(queue),
+      filename0_(configuration->property(role + ".filename", empty_string)),
+      sample_rate_(configuration->property(role + ".sampling_frequency", default_bandwidth)),
+      samples_to_skip_(0),
+      samples_(configuration->property(role + ".samples", static_cast<int64_t>(0))),
+      num_input_files_(1),
+      dma_buff_offset_pos_(0),
+      in_stream_(in_stream),
+      out_stream_(out_stream),
+      item_size_(sizeof(int8_t)),
+      enable_DMA_(false),
+      enable_dynamic_bit_selection_(configuration->property(role + ".enable_dynamic_bit_selection", true)),
+      repeat_(configuration->property(role + ".repeat", false))
+{
+    const double seconds_to_skip = configuration->property(role + ".seconds_to_skip", 0.0);
+    const size_t header_size = configuration->property(role + ".header_size", 0);
+
+    const bool enable_rx1_band((configuration->property("Channels_1C.count", 0) > 0) ||
+                               (configuration->property("Channels_1B.count", 0) > 0));
+    const bool enable_rx2_band((configuration->property("Channels_L2.count", 0) > 0) ||
+                               (configuration->property("Channels_L5.count", 0) > 0) ||
+                               (configuration->property("Channels_5X.count", 0) > 0));
+
+#if USE_GLOG_AND_GFLAGS
+    // override value with commandline flag, if present
+    if (FLAGS_signal_source != "-")
+        {
+            filename0_ = FLAGS_signal_source;
+        }
+    if (FLAGS_s != "-")
+        {
+            filename0_ = FLAGS_s;
+        }
+#else
+    if (absl::GetFlag(FLAGS_signal_source) != "-")
+        {
+            filename0_ = absl::GetFlag(FLAGS_signal_source);
+        }
+    if (absl::GetFlag(FLAGS_s) != "-")
+        {
+            filename0_ = absl::GetFlag(FLAGS_s);
+        }
+#endif
+    if (filename0_.empty())
+        {
+            num_input_files_ = 2;
+            filename0_ = configuration->property(role + ".filename0", empty_string);
+            filename1_ = configuration->property(role + ".filename1", empty_string);
+        }
+    // if only one input file is specified in the configuration file then:
+    // if there is at least one channel assigned to frequency band 1 then the DMA transfers the samples to the L1 frequency band channels
+    // otherwise the DMA transfers the samples to the L2/L5 frequency band channels
+    // if more than one input file are specified then the DMA transfer the samples to both the L1 and the L2/L5 frequency channels.
+    if (filename1_.empty())
+        {
+            if (enable_rx1_band)
+                {
+                    dma_buff_offset_pos_ = 2;
+                }
+        }
+    else
+        {
+            dma_buff_offset_pos_ = 2;
+        }
+
+    if (seconds_to_skip > 0)
+        {
+            samples_to_skip_ = static_cast<uint64_t>(seconds_to_skip * sample_rate_) * 2;
+        }
+    if (header_size > 0)
+        {
+            samples_to_skip_ += header_size;
+        }
+
+    switch_fpga = std::make_shared<Fpga_Switch>();
+    switch_fpga->set_switch_position(switch_to_DMA);
+
+    enable_DMA_ = true;
+
+    if (samples_ == 0)  // read all file
+        {
+            /*!
+                     * BUG workaround: The GNU Radio file source does not stop the receiver after reaching the End of File.
+                     * A possible solution is to compute the file length in samples using file size, excluding the last 100 milliseconds, and enable always the
+                     * valve block
+                     */
+            std::ifstream file(filename0_.c_str(), std::ios::in | std::ios::binary | std::ios::ate);
+            std::ifstream::pos_type size;
+
+            if (file.is_open())
+                {
+                    size = file.tellg();
+                    DLOG(INFO) << "Total samples in the file= " << floor(static_cast<double>(size) / static_cast<double>(item_size_));
+                }
+            else
+                {
+                    std::cerr << "SignalSource: Unable to open the samples file " << filename0_.c_str() << '\n';
+                    return;
+                }
+            std::streamsize ss = std::cout.precision();
+            std::cout << std::setprecision(16);
+            std::cout << "Processing file " << filename0_ << ", which contains " << static_cast<double>(size) << " [bytes]\n";
+            std::cout.precision(ss);
+
+            if (size > 0)
+                {
+                    const uint64_t bytes_to_skip = samples_to_skip_ * item_size_;
+                    const uint64_t bytes_to_process = static_cast<uint64_t>(size) - bytes_to_skip;
+                    samples_ = floor(static_cast<double>(bytes_to_process) / static_cast<double>(item_size_) - ceil(0.002 * static_cast<double>(sample_rate_)));  // process all the samples available in the file excluding at least the last 1 ms
+                }
+
+            if (!filename1_.empty())
+                {
+                    std::ifstream file(filename1_.c_str(), std::ios::in | std::ios::binary | std::ios::ate);
+                    std::ifstream::pos_type size;
+
+                    if (file.is_open())
+                        {
+                            size = file.tellg();
+                            DLOG(INFO) << "Total samples in the file= " << floor(static_cast<double>(size) / static_cast<double>(item_size_));
+                        }
+                    else
+                        {
+                            std::cerr << "SignalSource: Unable to open the samples file " << filename1_.c_str() << '\n';
+                            return;
+                        }
+                    std::streamsize ss = std::cout.precision();
+                    std::cout << std::setprecision(16);
+                    std::cout << "Processing file " << filename1_ << ", which contains " << static_cast<double>(size) << " [bytes]\n";
+                    std::cout.precision(ss);
+
+                    int64_t samples_rx2 = 0;
+                    if (size > 0)
+                        {
+                            const uint64_t bytes_to_skip = samples_to_skip_ * item_size_;
+                            const uint64_t bytes_to_process = static_cast<uint64_t>(size) - bytes_to_skip;
+                            samples_rx2 = floor(static_cast<double>(bytes_to_process) / static_cast<double>(item_size_) - ceil(0.002 * static_cast<double>(sample_rate_)));  // process all the samples available in the file excluding at least the last 1 ms
+                        }
+                    samples_ = std::min(samples_, samples_rx2);
+                }
+        }
+
+    CHECK(samples_ > 0) << "File does not contain enough samples to process.";
+    double signal_duration_s = (static_cast<double>(samples_) * (1 / static_cast<double>(sample_rate_))) / 2.0;
+
+    DLOG(INFO) << "Total number samples to be processed= " << samples_ << " GNSS signal duration= " << signal_duration_s << " [s]";
+    std::cout << "GNSS signal recorded time to be processed: " << signal_duration_s << " [s]\n";
+
+    if (filename1_.empty())
+        {
+            DLOG(INFO) << "File source filename " << filename0_;
+        }
+    else
+        {
+            DLOG(INFO) << "File source filename rx1 " << filename0_;
+            DLOG(INFO) << "File source filename rx2 " << filename1_;
+        }
+    DLOG(INFO) << "Samples " << samples_;
+    DLOG(INFO) << "Sampling frequency " << sample_rate_;
+    DLOG(INFO) << "Item type " << std::string("ibyte");
+    DLOG(INFO) << "Item size " << item_size_;
+    DLOG(INFO) << "Repeat " << repeat_;
+    //        }
+
+    // dynamic bits selection
+    if (enable_dynamic_bit_selection_)
+        {
+            dynamic_bit_selection_fpga = std::make_shared<Fpga_dynamic_bit_selection>(enable_rx1_band, enable_rx2_band);
+            thread_dynamic_bit_selection = std::thread([&] { run_dynamic_bit_selection_process(); });
+        }
+
+    if (in_stream_ > 0)
+        {
+            LOG(ERROR) << "A signal source does not have an input stream";
+        }
+    if (out_stream_ > 1)
+        {
+            LOG(ERROR) << "This implementation only supports one output stream";
+        }
+}
+
+
+DMAFpgaSignalSource::~DMAFpgaSignalSource()
+{
+    std::unique_lock<std::mutex> lock_DMA(dma_mutex);
+    enable_DMA_ = false;  // disable the DMA
+    lock_DMA.unlock();
+    if (thread_file_to_dma.joinable())
+        {
+            thread_file_to_dma.join();
+        }
+
+    std::unique_lock<std::mutex> lock_dyn_bit_sel(dynamic_bit_selection_mutex);
+    bool bit_selection_enabled = enable_dynamic_bit_selection_;
+    lock_dyn_bit_sel.unlock();
+
+    if (bit_selection_enabled == true)
+        {
+            std::unique_lock<std::mutex> lock(dynamic_bit_selection_mutex);
+            enable_dynamic_bit_selection_ = false;
+            lock.unlock();
+
+            if (thread_dynamic_bit_selection.joinable())
+                {
+                    thread_dynamic_bit_selection.join();
+                }
+        }
+}
+
+
+void DMAFpgaSignalSource::start()
+{
+    thread_file_to_dma = std::thread([&] { run_DMA_process(filename0_, filename1_, samples_to_skip_, item_size_, samples_, repeat_, dma_buff_offset_pos_, queue_); });
+}
+
+
+void DMAFpgaSignalSource::run_DMA_process(const std::string &filename0_, const std::string &filename1_, uint64_t &samples_to_skip, size_t &item_size, int64_t &samples, bool &repeat, uint32_t &dma_buff_offset_pos, Concurrent_Queue<pmt::pmt_t> *queue)
+{
+    std::ifstream infile1;
+    infile1.exceptions(std::ifstream::failbit | std::ifstream::badbit);
+
+
+    // FPGA DMA control
+    dma_fpga = std::make_shared<Fpga_DMA>();
+
+    // open the files
+    try
+        {
+            infile1.open(filename0_, std::ios::binary);
+        }
+    catch (const std::ifstream::failure &e)
+        {
+            std::cerr << "Exception opening file " << filename0_ << '\n';
+            // stop the receiver
+            queue->push(pmt::make_any(command_event_make(200, 0)));
+            return;
+        }
+
+    std::ifstream infile2;
+    if (!filename1_.empty())
+        {
+            infile2.exceptions(std::ifstream::failbit | std::ifstream::badbit);
+            try
+                {
+                    infile2.open(filename1_, std::ios::binary);
+                }
+            catch (const std::ifstream::failure &e)
+                {
+                    std::cerr << "Exception opening file " << filename1_ << '\n';
+                    // stop the receiver
+                    queue->push(pmt::make_any(command_event_make(200, 0)));
+                    return;
+                }
+        }
+
+    // skip the initial samples if needed
+    uint64_t bytes_to_skeep = samples_to_skip * item_size;
+    try
+        {
+            infile1.ignore(bytes_to_skeep);
+        }
+    catch (const std::ifstream::failure &e)
+        {
+            std::cerr << "Exception skipping initial samples file " << filename0_ << '\n';
+            // stop the receiver
+            queue->push(pmt::make_any(command_event_make(200, 0)));
+            return;
+        }
+
+    if (!filename1_.empty())
+        {
+            try
+                {
+                    infile2.ignore(bytes_to_skeep);
+                }
+            catch (const std::ifstream::failure &e)
+                {
+                    std::cerr << "Exception skipping initial samples file " << filename1_ << '\n';
+                    // stop the receiver
+                    queue->push(pmt::make_any(command_event_make(200, 0)));
+                    return;
+                }
+        }
+
+    // rx signal vectors
+    std::vector<int8_t> input_samples(sample_block_size * 2);  // complex samples
+    // pointer to DMA buffer
+    int8_t *dma_buffer;
+    int nread_elements = 0;  // num bytes read from the file corresponding to frequency band 1
+    bool run_DMA = true;
+
+    // Open DMA device
+    if (dma_fpga->DMA_open())
+        {
+            std::cerr << "Cannot open loop device\n";
+            // stop the receiver
+            queue->push(pmt::make_any(command_event_make(200, 0)));
+            return;
+        }
+    dma_buffer = dma_fpga->get_buffer_address();
+
+    // if only one frequency band is used then clear the samples corresponding to the unused frequency band
+    uint32_t dma_index = 0;
+    if (num_input_files_ == 1)
+        {
+            // if only one file is enabled then clear the samples corresponding to the frequency band that is not used.
+            for (int index0 = 0; index0 < (nread_elements); index0 += 2)
+                {
+                    dma_buffer[dma_index + (2 - dma_buff_offset_pos)] = 0;
+                    dma_buffer[dma_index + 1 + (2 - dma_buff_offset_pos)] = 0;
+                    dma_index += 4;
+                }
+        }
+
+    uint64_t nbytes_remaining = samples * item_size;
+    uint32_t read_buffer_size = sample_block_size * 2;  // complex samples
+
+    // run the DMA
+    while (run_DMA)
+        {
+            dma_index = 0;
+            if (nbytes_remaining < read_buffer_size)
+                {
+                    read_buffer_size = nbytes_remaining;
+                }
+            nbytes_remaining = nbytes_remaining - read_buffer_size;
+
+            // read filename 0
+            try
+                {
+                    infile1.read(reinterpret_cast<char *>(input_samples.data()), read_buffer_size);
+                }
+            catch (const std::ifstream::failure &e)
+                {
+                    std::cerr << "Exception reading file " << filename0_ << '\n';
+                    break;
+                }
+            if (infile1)
+                {
+                    nread_elements = read_buffer_size;
+                }
+            else
+                {
+                    // FLAG AS ERROR !! IT SHOULD NEVER HAPPEN
+                    nread_elements = infile1.gcount();
+                }
+
+            for (int index0 = 0; index0 < (nread_elements); index0 += 2)
+                {
+                    // dma_buff_offset_pos is 1 for the L1 band and 0 for the other bands
+                    dma_buffer[dma_index + dma_buff_offset_pos] = input_samples[index0];
+                    dma_buffer[dma_index + 1 + dma_buff_offset_pos] = input_samples[index0 + 1];
+                    dma_index += 4;
+                }
+
+            // read filename 1 (if enabled)
+            if (num_input_files_ > 1)
+                {
+                    dma_index = 0;
+                    try
+                        {
+                            infile2.read(reinterpret_cast<char *>(input_samples.data()), read_buffer_size);
+                        }
+                    catch (const std::ifstream::failure &e)
+                        {
+                            std::cerr << "Exception reading file " << filename1_ << '\n';
+                            break;
+                        }
+                    if (infile2)
+                        {
+                            nread_elements = read_buffer_size;
+                        }
+                    else
+                        {
+                            // FLAG AS ERROR !! IT SHOULD NEVER HAPPEN
+                            nread_elements = infile2.gcount();
+                        }
+
+                    for (int index0 = 0; index0 < (nread_elements); index0 += 2)
+                        {
+                            // filename2 is never the L1 band
+                            dma_buffer[dma_index] = input_samples[index0];
+                            dma_buffer[dma_index + 1] = input_samples[index0 + 1];
+                            dma_index += 4;
+                        }
+                }
+
+            if (nread_elements > 0)
+                {
+                    if (dma_fpga->DMA_write(nread_elements * 2))
+                        {
+                            std::cerr << "Error: DMA could not send all the required samples\n";
+                            break;
+                        }
+                    // Throttle the DMA
+                    std::this_thread::sleep_for(std::chrono::milliseconds(1));
+                }
+
+            if (nbytes_remaining == 0)
+                {
+                    if (repeat)
+                        {
+                            // read the file again
+                            nbytes_remaining = samples * item_size;
+                            read_buffer_size = sample_block_size * 2;
+                            try
+                                {
+                                    infile1.seekg(0);
+                                }
+                            catch (const std::ifstream::failure &e)
+                                {
+                                    std::cerr << "Exception resetting the position of the next byte to be extracted to zero " << filename0_ << '\n';
+                                    break;
+                                }
+
+                            // skip the initial samples if needed
+                            uint64_t bytes_to_skeep = samples_to_skip * item_size;
+                            try
+                                {
+                                    infile1.ignore(bytes_to_skeep);
+                                }
+                            catch (const std::ifstream::failure &e)
+                                {
+                                    std::cerr << "Exception skipping initial samples file " << filename0_ << '\n';
+                                    break;
+                                }
+
+                            if (!filename1_.empty())
+                                {
+                                    try
+                                        {
+                                            infile2.seekg(0);
+                                        }
+                                    catch (const std::ifstream::failure &e)
+                                        {
+                                            std::cerr << "Exception setting the position of the next byte to be extracted to zero " << filename1_ << '\n';
+                                            break;
+                                        }
+
+                                    try
+                                        {
+                                            infile2.ignore(bytes_to_skeep);
+                                        }
+                                    catch (const std::ifstream::failure &e)
+                                        {
+                                            std::cerr << "Exception skipping initial samples file " << filename1_ << '\n';
+                                            break;
+                                        }
+                                }
+                        }
+                    else
+                        {
+                            // the input file is completely processed. Stop the receiver.
+                            run_DMA = false;
+                        }
+                }
+            std::unique_lock<std::mutex> lock_DMA(dma_mutex);
+            if (enable_DMA_ == false)
+                {
+                    run_DMA = false;
+                }
+            lock_DMA.unlock();
+        }
+
+    if (dma_fpga->DMA_close())
+        {
+            std::cerr << "Error closing loop device " << '\n';
+        }
+    try
+        {
+            infile1.close();
+        }
+    catch (const std::ifstream::failure &e)
+        {
+            std::cerr << "Exception closing file " << filename0_ << '\n';
+        }
+
+    if (num_input_files_ > 1)
+        {
+            try
+                {
+                    infile2.close();
+                }
+            catch (const std::ifstream::failure &e)
+                {
+                    std::cerr << "Exception closing file " << filename1_ << '\n';
+                }
+        }
+
+    // Stop the receiver
+    queue->push(pmt::make_any(command_event_make(200, 0)));
+}
+
+
+void DMAFpgaSignalSource::run_dynamic_bit_selection_process()
+{
+    bool dynamic_bit_selection_active = true;
+
+    while (dynamic_bit_selection_active)
+        {
+            // setting the bit selection to the top bits
+            dynamic_bit_selection_fpga->bit_selection();
+            std::this_thread::sleep_for(std::chrono::milliseconds(Gain_control_period_ms));
+            std::unique_lock<std::mutex> lock_dyn_bit_sel(dynamic_bit_selection_mutex);
+            if (enable_dynamic_bit_selection_ == false)
+                {
+                    dynamic_bit_selection_active = false;
+                }
+            lock_dyn_bit_sel.unlock();
+        }
+}
+
+
+void DMAFpgaSignalSource::connect(gr::top_block_sptr top_block)
+{
+    if (top_block)
+        { /* top_block is not null */
+        };
+    DLOG(INFO) << "AD9361 FPGA source nothing to connect";
+}
+
+
+void DMAFpgaSignalSource::disconnect(gr::top_block_sptr top_block)
+{
+    if (top_block)
+        { /* top_block is not null */
+        };
+    DLOG(INFO) << "AD9361 FPGA source nothing to disconnect";
+}
+
+
+gr::basic_block_sptr DMAFpgaSignalSource::get_left_block()
+{
+    LOG(WARNING) << "Trying to get signal source left block.";
+    return {};
+}
+
+
+gr::basic_block_sptr DMAFpgaSignalSource::get_right_block()
+{
+    return {};
+}

src/algorithms/signal_source/adapters/dma_fpga_signal_source.h

@@ -0,0 +1,118 @@
+/*!
+ * \file dma_fpga_signal_source.h
+ * \brief signal source for a DMA connected directly to FPGA accelerators.
+ * This source implements only the DMA control. It is NOT compatible with
+ * conventional SDR acquisition and tracking blocks.
+ * \author Marc Majoral, mmajoral(at)cttc.es
+ *
+ * -----------------------------------------------------------------------------
+ *
+ * GNSS-SDR is a Global Navigation Satellite System software-defined receiver.
+ * This file is part of GNSS-SDR.
+ *
+ * Copyright (C) 2010-2024  (see AUTHORS file for a list of contributors)
+ * SPDX-License-Identifier: GPL-3.0-or-later
+ *
+ * -----------------------------------------------------------------------------
+ */
+
+#ifndef GNSS_SDR_DMA_FPGA_SIGNAL_SOURCE_H
+#define GNSS_SDR_DMA_FPGA_SIGNAL_SOURCE_H
+
+#include "concurrent_queue.h"
+#include "fpga_dma-proxy.h"
+#include "fpga_dynamic_bit_selection.h"
+#include "fpga_switch.h"
+#include "gnss_block_interface.h"
+#include "signal_source_base.h"
+#include <pmt/pmt.h>
+#include <cstdint>
+#include <memory>
+#include <mutex>
+#include <string>
+#include <thread>
+
+
+/** \addtogroup Signal_Source
+ * \{ */
+/** \addtogroup Signal_Source_adapters
+ * \{ */
+
+
+class ConfigurationInterface;
+
+class DMAFpgaSignalSource : public SignalSourceBase
+{
+public:
+    DMAFpgaSignalSource(const ConfigurationInterface *configuration,
+        const std::string &role, unsigned int in_stream,
+        unsigned int out_stream, Concurrent_Queue<pmt::pmt_t> *queue);
+
+    ~DMAFpgaSignalSource();
+
+    void start() override;
+
+    inline size_t item_size() override
+    {
+        return item_size_;
+    }
+
+    void connect(gr::top_block_sptr top_block) override;
+    void disconnect(gr::top_block_sptr top_block) override;
+    gr::basic_block_sptr get_left_block() override;
+    gr::basic_block_sptr get_right_block() override;
+
+private:
+    const std::string dyn_bit_sel_device_name = std::string("dynamic_bits_selector");  // Switch dhnamic bit selector device name
+    const std::string empty_string;
+    const uint64_t default_bandwidth = 12500000;
+    // perform dynamic bit selection every 500 ms by default
+    const uint32_t Gain_control_period_ms = 500;
+    // sample block size when running in post-processing mode
+    const int sample_block_size = 16384;
+    const int32_t switch_to_DMA = 0;
+
+    void run_DMA_process(const std::string &filename0,
+        const std::string &filename1,
+        uint64_t &samples_to_skip,
+        size_t &item_size,
+        int64_t &samples,
+        bool &repeat,
+        uint32_t &dma_buff_offset_pos,
+        Concurrent_Queue<pmt::pmt_t> *queue);
+
+    void run_dynamic_bit_selection_process();
+
+    std::thread thread_file_to_dma;
+    std::thread thread_dynamic_bit_selection;
+
+    std::shared_ptr<Fpga_Switch> switch_fpga;
+    std::shared_ptr<Fpga_dynamic_bit_selection> dynamic_bit_selection_fpga;
+    std::shared_ptr<Fpga_DMA> dma_fpga;
+
+    std::mutex dma_mutex;
+    std::mutex dynamic_bit_selection_mutex;
+
+    Concurrent_Queue<pmt::pmt_t> *queue_;
+
+    std::string filename0_;
+    std::string filename1_;
+
+    uint64_t sample_rate_;
+    uint64_t samples_to_skip_;
+    int64_t samples_;
+    uint32_t num_input_files_;
+    uint32_t dma_buff_offset_pos_;
+    uint32_t in_stream_;
+    uint32_t out_stream_;
+    size_t item_size_;
+
+    bool enable_DMA_;
+    bool enable_dynamic_bit_selection_;
+    bool repeat_;
+};
+
+
+/** \} */
+/** \} */
+#endif  // GNSS_SDR_DMA_FPGA_SIGNAL_SOURCE_H

src/algorithms/signal_source/libs/fpga_buffer_monitor.cc

@@ -25,6 +25,7 @@
 #include "fpga_buffer_monitor.h"
 #include "gnss_sdr_create_directory.h"
 #include "gnss_sdr_filesystem.h"
+#include "uio_fpga.h"
 #include <ctime>       // for time, localtime
 #include <fcntl.h>     // for open, O_RDWR, O_SYNC
 #include <fstream>     // for string, ofstream
@@ -40,7 +41,16 @@
 #endif
 
 
-Fpga_buffer_monitor::Fpga_buffer_monitor(const std::string &device_name,
+//Fpga_buffer_monitor::Fpga_buffer_monitor(const std::string &device_name,
+//    uint32_t num_freq_bands,
+//    bool dump,
+//    std::string dump_filename)
+//    : d_dump_filename(std::move(dump_filename)),
+//      d_num_freq_bands(num_freq_bands),
+//      d_max_buff_occ_freq_band_0(0),
+//      d_max_buff_occ_freq_band_1(0),
+//      d_dump(dump)
+Fpga_buffer_monitor::Fpga_buffer_monitor(
     uint32_t num_freq_bands,
     bool dump,
     std::string dump_filename)
@@ -50,10 +60,19 @@ Fpga_buffer_monitor::Fpga_buffer_monitor(const std::string &device_name,
       d_max_buff_occ_freq_band_1(0),
       d_dump(dump)
 {
-    // open device descriptor
+    std::string device_io_name;
-    if ((d_device_descriptor = open(device_name.c_str(), O_RDWR | O_SYNC)) == -1)
+
+    // find the uio device file corresponding to the buffer monitor
+    if (find_uio_dev_file_name(device_io_name, BUFFER_MONITOR_DEVICE_NAME, 0) < 0)
         {
-            LOG(WARNING) << "Cannot open deviceio" << device_name;
+            std::cerr << "Cannot find the FPGA uio device file corresponding to device name " << BUFFER_MONITOR_DEVICE_NAME << '\n';
+            return;
+        }
+
+    // open device descriptor
+    if ((d_device_descriptor = open(device_io_name.c_str(), O_RDWR | O_SYNC)) == -1)
+        {
+            LOG(WARNING) << "Cannot open deviceio" << device_io_name;
         }
 
     // device memory map

src/algorithms/signal_source/libs/fpga_buffer_monitor.h

@@ -45,10 +45,13 @@ public:
     /*!
      * \brief Constructor
      */
-    explicit Fpga_buffer_monitor(const std::string& device_name,
+    explicit Fpga_buffer_monitor(uint32_t num_freq_bands,
-        uint32_t num_freq_bands,
         bool dump,
         std::string dump_filename);
+    //    explicit Fpga_buffer_monitor(const std::string& device_name,
+    //        uint32_t num_freq_bands,
+    //        bool dump,
+    //        std::string dump_filename);
 
     /*!
      * \brief Destructor
@@ -61,6 +64,7 @@ public:
     void check_buffer_overflow_and_monitor_buffer_status();
 
 private:
+    const std::string BUFFER_MONITOR_DEVICE_NAME = std::string("buffer_monitor");  // buffer monitor device name
     static const size_t FPGA_PAGE_SIZE = 0x1000;
     static const uint32_t test_register_writeval = 0x55AA;
     static const uint32_t num_sapmples_per_buffer_element = 2;

src/algorithms/signal_source/libs/fpga_dynamic_bit_selection.h

@@ -56,7 +56,6 @@ public:
     void bit_selection(void);
 
 private:
-    const std::string switch_device_name = std::string("AXIS_Switch_v1_0_0");          // Switch UIO device name
     const std::string dyn_bit_sel_device_name = std::string("dynamic_bits_selector");  // Switch dhnamic bit selector device name
     static const size_t FPGA_PAGE_SIZE = 0x1000;
     static const uint32_t Num_bits_ADC = 12;                                      // Number of bits in the ADC

src/algorithms/signal_source/libs/fpga_switch.cc

@@ -21,6 +21,7 @@
  */
 
 #include "fpga_switch.h"
+#include "uio_fpga.h"
 #include <fcntl.h>     // for open, O_RDWR, O_SYNC
 #include <iostream>    // for cout
 #include <sys/mman.h>  // for mmap
@@ -32,11 +33,19 @@
 #include <absl/log/log.h>
 #endif
 
-Fpga_Switch::Fpga_Switch(const std::string &device_name)
+Fpga_Switch::Fpga_Switch(void)
 {
-    if ((d_device_descriptor = open(device_name.c_str(), O_RDWR | O_SYNC)) == -1)
+    std::string device_io_name;  // Switch UIO device file
+    // find the uio device file corresponding to the switch.
+    if (find_uio_dev_file_name(device_io_name, SWITCH_DEVICE_NAME, 0) < 0)
         {
-            LOG(WARNING) << "Cannot open deviceio" << device_name;
+            std::cerr << "Cannot find the FPGA uio device file corresponding to device name " << SWITCH_DEVICE_NAME << '\n';
+            return;
+        }
+
+    if ((d_device_descriptor = open(device_io_name.c_str(), O_RDWR | O_SYNC)) == -1)
+        {
+            LOG(WARNING) << "Cannot open deviceio" << device_io_name;
         }
     d_map_base = reinterpret_cast<volatile unsigned *>(mmap(nullptr, FPGA_PAGE_SIZE,
         PROT_READ | PROT_WRITE, MAP_SHARED, d_device_descriptor, 0));

src/algorithms/signal_source/libs/fpga_switch.h

@@ -42,8 +42,7 @@ public:
     /*!
      * \brief Constructor
      */
-    explicit Fpga_Switch(const std::string& device_name);
+    explicit Fpga_Switch(void);
-
     /*!
      * \brief Destructor
      */
@@ -55,6 +54,7 @@ public:
     void set_switch_position(int32_t switch_position);
 
 private:
+    const std::string SWITCH_DEVICE_NAME = std::string("AXIS_Switch_v1_0_0");  // Switch UIO device name
     static const size_t FPGA_PAGE_SIZE = 0x1000;
     static const uint32_t TEST_REGISTER_TRACK_WRITEVAL = 0x55AA;
     static const uint32_t MAX_LENGTH_DEVICEIO_NAME = 50;

src/core/receiver/gnss_block_factory.cc

@@ -128,6 +128,7 @@
 #endif
 
 #if ENABLE_FPGA
+#include "dma_fpga_signal_source.h"
 #include "galileo_e1_dll_pll_veml_tracking_fpga.h"
 #include "galileo_e1_pcps_ambiguous_acquisition_fpga.h"
 #include "galileo_e5a_dll_pll_tracking_fpga.h"
@@ -811,7 +812,7 @@ std::unique_ptr<GNSSBlockInterface> GNSSBlockFactory::GetBlock(
                 }
 #endif
 
-#if AD9361_DRIVER
+#if ENABLE_FPGA and AD9361_DRIVER
             // The AD9361_DRIVER Driver must be instantiated last. In this way, when using the FPGA, and when using the GNSS receiver
             // in post-processing mode, the receiver is configured and ready when the DMA starts sending samples to the receiver.
             else if (implementation == "Ad9361_Fpga_Signal_Source")
@@ -822,6 +823,15 @@ std::unique_ptr<GNSSBlockInterface> GNSSBlockFactory::GetBlock(
                 }
 #endif
 
+#if ENABLE_FPGA
+            else if (implementation == "DMA_Fpga_Signal_Source")
+                {
+                    std::unique_ptr<GNSSBlockInterface> block_ = std::make_unique<DMAFpgaSignalSource>(configuration, role, in_streams,
+                        out_streams, queue);
+                    block = std::move(block_);
+                }
+#endif
+
 #if ZEROMQ_DRIVER
             else if (implementation == "ZMQ_Signal_Source")
                 {

src/core/receiver/gnss_flowgraph.cc

@@ -547,7 +547,7 @@ int GNSSFlowgraph::connect_fpga_flowgraph()
             if (src == nullptr)
                 {
                     help_hint_ += " * Check implementation name for SignalSource block.\n";
-                    help_hint_ += "   Signal Source block implementation for FPGA off-loading should be Ad9361_Fpga_Signal_Source\n";
+                    help_hint_ += "   Signal Source block implementation for FPGA off-loading should be Ad9361_Fpga_Signal_Source or DMA_Fpga_Signal_Source\n";
                     return 1;
                 }
             if (src->item_size() == 0)

src/tests/unit-tests/signal-processing-blocks/acquisition/galileo_e1_pcps_ambiguous_acquisition_test_fpga.cc

@@ -321,7 +321,7 @@ bool GalileoE1PcpsAmbiguousAcquisitionTestFpga::acquire_signal()
     // instantiate the FPGA switch and set the
     // switch position to DMA.
     std::shared_ptr<Fpga_Switch> switch_fpga;
-    switch_fpga = std::make_shared<Fpga_Switch>("/dev/uio1");
+    switch_fpga = std::make_shared<Fpga_Switch>();
     switch_fpga->set_switch_position(0);  // set switch position to DMA
 
     // create the correspondign acquisition block according to the desired tracking signal

src/tests/unit-tests/signal-processing-blocks/acquisition/gps_l1_ca_pcps_acquisition_test_fpga.cc

@@ -320,7 +320,7 @@ bool GpsL1CaPcpsAcquisitionTestFpga::acquire_signal()
     // instantiate the FPGA switch and set the
     // switch position to DMA.
     std::shared_ptr<Fpga_Switch> switch_fpga;
-    switch_fpga = std::make_shared<Fpga_Switch>("/dev/uio1");
+    switch_fpga = std::make_shared<Fpga_Switch>();
     switch_fpga->set_switch_position(0);  // set switch position to DMA
 
     // create the correspondign acquisition block according to the desired tracking signal

src/tests/unit-tests/signal-processing-blocks/observables/hybrid_observables_test_fpga.cc

@@ -638,7 +638,7 @@ bool HybridObservablesTestFpga::acquire_signal()
     // instantiate the FPGA switch and set the
     // switch position to DMA.
     std::shared_ptr<Fpga_Switch> switch_fpga;
-    switch_fpga = std::make_shared<Fpga_Switch>("/dev/uio1");
+    switch_fpga = std::make_shared<Fpga_Switch>();
     switch_fpga->set_switch_position(0);  // set switch position to DMA
 
     // create the correspondign acquisition block according to the desired tracking signal

src/tests/unit-tests/signal-processing-blocks/tracking/tracking_pull-in_test_fpga.cc

@@ -634,7 +634,7 @@ bool TrackingPullInTestFpga::acquire_signal(int SV_ID)
     // instantiate the FPGA switch and set the
     // switch position to DMA.
     std::shared_ptr<Fpga_Switch> switch_fpga;
-    switch_fpga = std::make_shared<Fpga_Switch>("/dev/uio1");
+    switch_fpga = std::make_shared<Fpga_Switch>();
     switch_fpga->set_switch_position(0);  // set switch position to DMA
 
     // create the correspondign acquisition block according to the desired tracking signal