kopia lustrzana https://github.com/bristol-seds/pico-tracker
[New feature] Added function prototype for olivia mfsk encoding
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/*
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* Bit-bangs MFSK
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* Copyright (C) 2014 Richard Meadows <richardeoin>
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*
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* Permission is hereby granted, free of charge, to any person obtaining
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* a copy of this software and associated documentation files (the
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* "Software"), to deal in the Software without restriction, including
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* without limitation the rights to use, copy, modify, merge, publish,
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* distribute, sublicense, and/or sell copies of the Software, and to
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* permit persons to whom the Software is furnished to do so, subject to
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* the following conditions:
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*
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* The above copyright notice and this permission notice shall be
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* included in all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
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* LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
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* OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
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* WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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*/
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#ifndef MFSK_H
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#define MFSK_H
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#include "samd20.h"
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void olivia_mfsk_encode_block(char* buffer, int8_t* tones);
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#endif /* MFSK_H */
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/*
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* Functions for MFSK encoding / decoding
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* Copyright (C) 2014 Richard Meadows <richardeoin>
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*
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* Permission is hereby granted, free of charge, to any person obtaining
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* a copy of this software and associated documentation files (the
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* "Software"), to deal in the Software without restriction, including
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* without limitation the rights to use, copy, modify, merge, publish,
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* distribute, sublicense, and/or sell copies of the Software, and to
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* permit persons to whom the Software is furnished to do so, subject to
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* the following conditions:
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*
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* The above copyright notice and this permission notice shall be
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* included in all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
|
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
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* LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
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* OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
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* WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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*/
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#include <string.h>
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#include "samd20.h"
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#include "msfk.h"
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//#define OLIVIA_MFSK_ENCODE_TEST
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#ifdef OLIVIA_MFSK_ENCODE_TEST
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#include <stdint.h>
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#endif
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static const uint64_t ScramblingCodeOlivia = 0xE257E6D0291574ECLL;
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static const uint64_t ScramblingCodeContestia = 0xEDB88320LL;
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/**
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* USEFUL RESOURES =============================================================
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*
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* http://en.wikipedia.org/wiki/Olivia_MFSK
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* http://www.arrl.org/olivia
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*
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* Also, although without images:
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* http://web.archive.org/web/20070927210543/http://homepage.sunrise.ch/mysunrise/jalocha/fht_coding.htm
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*
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* Useful guide to the differences between olivia and contestia
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* (ultimately we'd like to support both):
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* http://f1ult.free.fr/DIGIMODES/MULTIPSK/contestia_rttym_en.htm
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*
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* Also dl-fldigi's source might be helpful:
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* https://github.com/jamescoxon/dl-fldigi/blob/master/src/include/jalocha/pj_mfsk.h
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*/
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/**
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* This function encodes a single block of Olivia MFSK
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*
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* It takes a buffer of ASCII-encoded text and returns an array of
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* tones to transmit.
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*/
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void olivia_mfsk_encode_block(char* buffer, int8_t* tones)
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{
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size_t bits_per_character = 7;
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size_t bits_per_symbol = 5; /* That is, there are 2^5=32 tones */
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size_t symbols_per_block = 64;
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/* TODO! */
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}
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#ifdef OLIVIA_MFSK_ENCODE_TEST
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void main(void)
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{
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/* Define a test string */
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char test_string[6];
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test_string = "HELLO";
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/* Define a buffer for the tones produced */
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int8_t tones[64];
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olivia_mfsk_encode_block(buffer, tones);
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/* Debug printout */
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for (int i = 0; i < sizeof(tones)/sizeof(int8_t); i++) {
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printf("%d ", tones[i]);
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}
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printf("\n");
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}
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#endif
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