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82 lines
3.6 KiB
C
82 lines
3.6 KiB
C
/** @file
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Pulse data structure and functions.
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Copyright (C) 2015 Tommy Vestermark
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Copyright (C) 2022 Christian W. Zuckschwerdt <zany@triq.net>
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This program 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 2 of the License, or
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(at your option) any later version.
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*/
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#ifndef INCLUDE_PULSE_DATA_H_
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#define INCLUDE_PULSE_DATA_H_
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#include <stdint.h>
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#include <stdio.h>
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#include "data.h"
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#define PD_MAX_PULSES 1200 // Maximum number of pulses before forcing End Of Package
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#define PD_MIN_PULSES 16 // Minimum number of pulses before declaring a proper package
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#define PD_MIN_PULSE_SAMPLES 10 // Minimum number of samples in a pulse for proper detection
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#define PD_MIN_GAP_MS 10 // Minimum gap size in milliseconds to exceed to declare End Of Package
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#define PD_MAX_GAP_MS 100 // Maximum gap size in milliseconds to exceed to declare End Of Package
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#define PD_MAX_GAP_RATIO 10 // Ratio gap/pulse width to exceed to declare End Of Package (heuristic)
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#define PD_MAX_PULSE_MS 100 // Pulse width in ms to exceed to declare End Of Package (e.g. for non OOK packages)
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/// Data for a compact representation of generic pulse train.
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typedef struct pulse_data {
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uint64_t offset; ///< Offset to first pulse in number of samples from start of stream.
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uint32_t sample_rate; ///< Sample rate the pulses are recorded with.
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unsigned depth_bits; ///< Sample depth in bits.
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unsigned start_ago; ///< Start of first pulse in number of samples ago.
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unsigned end_ago; ///< End of last pulse in number of samples ago.
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unsigned int num_pulses;
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int pulse[PD_MAX_PULSES]; ///< Width of pulses (high) in number of samples.
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int gap[PD_MAX_PULSES]; ///< Width of gaps between pulses (low) in number of samples.
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int ook_low_estimate; ///< Estimate for the OOK low level (base noise level) at beginning of package.
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int ook_high_estimate; ///< Estimate for the OOK high level at end of package.
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int fsk_f1_est; ///< Estimate for the F1 frequency for FSK.
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int fsk_f2_est; ///< Estimate for the F2 frequency for FSK.
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float freq1_hz;
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float freq2_hz;
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float centerfreq_hz;
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float range_db;
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float rssi_db;
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float snr_db;
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float noise_db;
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} pulse_data_t;
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/// Clear the content of a pulse_data_t structure.
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void pulse_data_clear(pulse_data_t *data);
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/// Shift out part of the data to make room for more.
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void pulse_data_shift(pulse_data_t *data);
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/// Print the content of a pulse_data_t structure (for debug).
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void pulse_data_print(pulse_data_t const *data);
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/// Dump the content of a pulse_data_t structure as raw binary.
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void pulse_data_dump_raw(uint8_t *buf, unsigned len, uint64_t buf_offset, pulse_data_t const *data, uint8_t bits);
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/// Print a header for the VCD format.
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void pulse_data_print_vcd_header(FILE *file, uint32_t sample_rate);
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/// Print the content of a pulse_data_t structure in VCD format.
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void pulse_data_print_vcd(FILE *file, pulse_data_t const *data, int ch_id);
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/// Read the next pulse_data_t structure from OOK text.
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void pulse_data_load(FILE *file, pulse_data_t *data, uint32_t sample_rate);
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/// Print a header for the OOK text format.
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void pulse_data_print_pulse_header(FILE *file);
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/// Print the content of a pulse_data_t structure as OOK text.
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void pulse_data_dump(FILE *file, pulse_data_t const *data);
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/// Print the content of a pulse_data_t structure as OOK json.
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data_t *pulse_data_print_data(pulse_data_t const *data);
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#endif /* INCLUDE_PULSE_DATA_H_ */
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