mirror of https://github.com/gnss-sdr/gnss-sdr
182 lines
6.1 KiB
C++
182 lines
6.1 KiB
C++
/*!
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* \file fpga_acquisition.h
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* \brief Highly optimized FPGA vector correlator class
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* \authors <ul>
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* <li> Marc Majoral, 2019. mmajoral(at)cttc.cat
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* </ul>
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*
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* Class that controls and executes a highly optimized acquisition HW
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* accelerator in the FPGA
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*
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* -------------------------------------------------------------------------
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*
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* Copyright (C) 2010-2019 (see AUTHORS file for a list of contributors)
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*
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* GNSS-SDR is a software defined Global Navigation
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* Satellite Systems receiver
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*
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* This file is part of GNSS-SDR.
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*
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* GNSS-SDR is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* GNSS-SDR is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with GNSS-SDR. If not, see <https://www.gnu.org/licenses/>.
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*
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* -------------------------------------------------------------------------
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*/
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#ifndef GNSS_SDR_FPGA_ACQUISITION_H_
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#define GNSS_SDR_FPGA_ACQUISITION_H_
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#include <cstdint>
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#include <string>
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/*!
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* \brief Class that implements carrier wipe-off and correlators.
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*/
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class Fpga_Acquisition
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{
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public:
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/*!
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* \brief Constructor
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*/
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Fpga_Acquisition(
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std::string device_name,
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uint32_t nsamples,
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uint32_t doppler_max,
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uint32_t nsamples_total,
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int64_t fs_in,
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uint32_t select_queue,
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uint32_t *all_fft_codes,
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uint32_t excludelimit);
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/*!
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* \brief Destructor
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*/
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~Fpga_Acquisition() = default;
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/*!
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* \brief Select the code with the chosen PRN
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*/
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bool set_local_code(uint32_t PRN);
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/*!
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* \brief Configure the doppler sweep parameters in the FPGA
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*/
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void set_doppler_sweep(uint32_t num_sweeps, uint32_t doppler_step, int32_t doppler_min);
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/*!
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* \brief Run the acquisition process in the FPGA
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*/
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void run_acquisition();
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/*!
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* \brief Read the results of the acquisition process
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*/
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void read_acquisition_results(
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uint32_t *max_index,
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float *firstpeak,
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float *secondpeak,
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uint64_t *initial_sample,
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float *power_sum,
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uint32_t *doppler_index,
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uint32_t *total_blk_exp);
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/*!
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* \brief Set maximum Doppler grid search
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* \param doppler_max - Maximum Doppler shift considered in the grid search [Hz].
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*/
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void set_doppler_max(uint32_t doppler_max)
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{
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d_doppler_max = doppler_max;
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}
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/*!
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* \brief Set Doppler steps for the grid search
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* \param doppler_step - Frequency bin of the search grid [Hz].
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*/
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void set_doppler_step(uint32_t doppler_step)
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{
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d_doppler_step = doppler_step;
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}
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/*!
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* \brief Reset the FPGA PL.
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*/
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void reset_acquisition();
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/*!
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* \brief Read the scaling factor that has been used by the FFT-IFFT
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*/
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void read_fpga_total_scale_factor(uint32_t *total_scale_factor, uint32_t *fw_scale_factor);
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/*!
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* \brief Set the block exponent of the FFT in the FPGA.
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*/
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void set_block_exp(uint32_t total_block_exp);
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/*!
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* \brief Write the PRN code in the FPGA
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*/
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void write_local_code(void);
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/*!
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* \brief Write the acquisition parameters into the FPGA
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*/
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void configure_acquisition(void);
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/*!
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* \brief Open the device driver
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*/
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void open_device();
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/*!
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* \brief Close the device driver
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*/
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void close_device();
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private:
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// FPGA register parameters
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static const uint32_t PAGE_SIZE_DEFAULT = 0x10000; // default page size for the multicorrelator memory map
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static const uint32_t RESET_ACQUISITION = 2; // command to reset the multicorrelator
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static const uint32_t LAUNCH_ACQUISITION = 1; // command to launch the multicorrelator
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static const uint32_t TEST_REG_SANITY_CHECK = 0x55AA; // value to check the presence of the test register (to detect the hw)
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static const uint32_t LOCAL_CODE_CLEAR_MEM = 0x10000000; // command to clear the internal memory of the multicorrelator
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static const uint32_t MEM_LOCAL_CODE_WR_ENABLE = 0x0C000000; // command to enable the ENA and WR pins of the internal memory of the multicorrelator
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static const uint32_t POW_2_2 = 4; // 2^2 (used for the conversion of floating point numbers to integers)
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static const uint32_t POW_2_31 = 2147483648; // 2^31 (used for the conversion of floating point numbers to integers)
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static const uint32_t SELECT_LSBits = 0x0000FFFF; // Select the 10 LSbits out of a 20-bit word
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static const uint32_t SELECT_MSBbits = 0xFFFF0000; // Select the 10 MSbits out of a 20-bit word
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static const uint32_t SELECT_ALL_CODE_BITS = 0xFFFFFFFF; // Select a 20 bit word
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static const uint32_t SHL_CODE_BITS = 65536; // shift left by 10 bits
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int64_t d_fs_in;
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// data related to the hardware module and the driver
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int32_t d_fd; // driver descriptor
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volatile uint32_t *d_map_base; // driver memory map
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uint32_t *d_all_fft_codes; // memory that contains all the code ffts
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uint32_t d_vector_length; // number of samples including padding and number of ms
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uint32_t d_excludelimit;
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uint32_t d_nsamples_total; // number of samples including padding
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uint32_t d_nsamples; // number of samples not including padding
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uint32_t d_select_queue; // queue selection
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std::string d_device_name; // HW device name
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uint32_t d_doppler_max; // max doppler
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uint32_t d_doppler_step; // doppler step
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uint32_t d_PRN; // PRN
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// FPGA private functions
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void fpga_acquisition_test_register(void);
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void read_result_valid(uint32_t *result_valid);
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};
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#endif // GNSS_SDR_FPGA_ACQUISITION_H_
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