92 lines
2.3 KiB
C++
92 lines
2.3 KiB
C++
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/*
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* Copyright (C) 2015 Jared Boone, ShareBrained Technology, Inc.
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* Copyright (C) 2016 Furrtek
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*
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* This file is part of PortaPack.
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*
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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, or (at your option)
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* any later version.
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*
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* This program 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 this program; see the file COPYING. If not, write to
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* the Free Software Foundation, Inc., 51 Franklin Street,
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* Boston, MA 02110-1301, USA.
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*/
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#include "morse.hpp"
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#include "baseband_api.hpp"
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#include "portapack.hpp"
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using namespace portapack;
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#include "utility.hpp"
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namespace morse {
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// Returns 0 if message is too long
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size_t morse_encode(std::string& message, const uint32_t time_unit_ms,
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const uint32_t tone, uint32_t * const time_units) {
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size_t i, c;
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uint16_t code, code_size;
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uint8_t morse_message[256];
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uint32_t delta;
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*time_units = 0;
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i = 0;
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for (char& ch : message) {
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if (i > 256) return 0; // Message too long
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if ((ch >= 'a') && (ch <= 'z')) // Make uppercase
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ch -= 32;
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if ((ch >= '!') && (ch <= '_')) {
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code = morse_ITU[ch - '!'];
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} else {
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code = 0; // Default to space char
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}
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if (!code) {
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if (i)
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morse_message[i - 1] = 4; // Word space
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} else {
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code_size = code & 7;
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for (c = 0; c < code_size; c++) {
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morse_message[i++] = ((code << c) & 0x8000) ? 1 : 0; // Dot/dash
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morse_message[i++] = 2; // Symbol space
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}
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morse_message[i - 1] = 3; // Letter space
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}
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}
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// Count time units
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for (c = 0; c < i; c++) {
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*time_units += morse_symbols[morse_message[c]];
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}
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memcpy(shared_memory.bb_data.tones_data.message, morse_message, i);
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// Setup tone "symbols"
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for (c = 0; c < 5; c++) {
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if (c < 2)
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delta = TONES_F2D(tone, TONES_SAMPLERATE); // Dot and dash
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else
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delta = 0; // Pause
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baseband::set_tone(c, delta, (TONES_SAMPLERATE * morse_symbols[c] * time_unit_ms) / 1000);
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}
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return i;
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}
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} /* namespace morse */
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