54 lines
1.5 KiB
C
54 lines
1.5 KiB
C
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/*
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* File: preamble.h
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* Author: nzasch
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*
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* Created on 12 gennaio 2017, 15.05
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*/
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#ifndef PREAMBLE_H
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#define PREAMBLE_H
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#include <stdint.h>
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#ifdef __XC16
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#include <libq.h>
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#include <dsp.h>
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#else
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typedef int16_t _Q0_15;
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typedef int32_t _Q15_16;
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typedef _Q0_15 _Q15;
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typedef _Q15_16 _Q16;
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typedef int16_t fractional;
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#endif
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#include "modem_types.h"
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#include "demodulator.h"
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#define MODEM_PREAMBLE_LENGTH 13U
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#define MODEM_PREAMBLE_SQUELCH 0.7f // da 0 a 1
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// ((16000 ? 32) ? 20) ? 13 = 325
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#define MODEM_PREAMBLE_SEARCH_BUFF_SIZE 512U // circa (MODEM_PREAMBLE_LENGTH * MAX_BUFFERS_PER_SYMBOL) ma deve esere ^ di 2
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#define MODEM_PREAMBLE_SEARCH_BUFF_SIZE_MASK (MODEM_PREAMBLE_SEARCH_BUFF_SIZE - 1)
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extern fractional sync_values_sequence[MODEM_PREAMBLE_LENGTH * MAX_BUFFERS_PER_SYMBOL]; ///< buffer che contiene il modello di sequenza
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extern _Q15_16 preamble_squelch_distance; ///< squelch pesato sulla lunghezza del preambolo
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// extern uint8_t modem_preamble_pending, modem_preamble_done;
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extern uint8_t modem_preamble_waiting, modem_post_preamble_delay, modem_post_preamble_timer;
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extern uint16_t BuffersPerPreamble;
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// protoz
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void modem_set_up_preamble(void);
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uint8_t modem_generate_preamble(uint8_t *ModulationSymbolsBuffer);
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void modem_generate_preamble_fingerprint(uint8_t *ModulationSymbolsBuffer, fractional *symbols_values_sequence, uint8_t values_per_symbol);
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_Q15_16 modem_get_preamble_max_correlation_index(uint8_t *ModulationSymbolsBuffer);
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uint8_t modem_detect_preamble(fractional insymbol);
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#endif /* PREAMBLE_H */
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