mirror of https://github.com/g4klx/MMDVM.git
177 lines
5.3 KiB
C++
177 lines
5.3 KiB
C++
/*
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* Copyright (C) 2009-2016 by Jonathan Naylor G4KLX
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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 of the License, or
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* (at your option) 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; if not, write to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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#include "Config.h"
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#include "Globals.h"
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#include "YSFTX.h"
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#include "YSFDefines.h"
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#if defined(USE_SHORTER_DMR_FILTER)
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// Generated using rcosdesign(0.2, 4, 10, 'sqrt') in MATLAB
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static q15_t YSF_C4FSK_FILTER[] = {486, 39, -480, -1022, -1526, -1928, -2164, -2178, -1927, -1384, -548, 561, 1898, 3399, 4980, 6546, 7999, 9246, 10202, 10803, 11008, 10803, 10202, 9246,
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7999, 6546, 4980, 3399, 1898, 561, -548, -1384, -1927, -2178, -2164, -1928, -1526, -1022, -480, 39, 486, 0};
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const uint16_t YSF_C4FSK_FILTER_LEN = 42U;
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#else
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// Generated using rcosdesign(0.2, 8, 10, 'sqrt') in MATLAB
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static q15_t YSF_C4FSK_FILTER[] = {283, 198, 73, -78, -240, -393, -517, -590, -599, -533, -391, -181, 79, 364, 643, 880, 1041, 1097, 1026, 819, 483, 39, -477, -1016, -1516, -1915, -2150,
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-2163, -1914, -1375, -545, 557, 1886, 3376, 4946, 6502, 7946, 9184, 10134, 10731, 10935, 10731, 10134, 9184, 7946, 6502, 4946, 3376, 1886, 557, -545,
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-1375, -1914, -2163, -2150, -1915, -1516, -1016, -477, 39, 483, 819, 1026, 1097, 1041, 880, 643, 364, 79, -181, -391, -533, -599, -590, -517, -393, -240,
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-78, 73, 198, 283, 0};
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const uint16_t YSF_C4FSK_FILTER_LEN = 82U;
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#endif
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const uint8_t YSF_START_SYNC = 0x77U;
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const uint8_t YSF_END_SYNC = 0xFFU;
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q15_t YSF_A[] = { 1408, 1408, 1408, 1408, 1408, 1408, 1408, 1408, 1408, 1408};
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q15_t YSF_B[] = { 470, 470, 470, 470, 470, 470, 470, 470, 470, 470};
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q15_t YSF_C[] = { -470, -470, -470, -470, -470, -470, -470, -470, -470, -470};
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q15_t YSF_D[] = {-1408, -1408, -1408, -1408, -1408, -1408, -1408, -1408, -1408, -1408};
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CYSFTX::CYSFTX() :
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m_buffer(),
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m_modFilter(),
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m_modState(),
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m_poBuffer(),
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m_poLen(0U),
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m_poPtr(0U),
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m_txDelay(120U), // 100ms
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m_count(0U)
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{
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::memset(m_modState, 0x00U, 130U * sizeof(q15_t));
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m_modFilter.numTaps = YSF_C4FSK_FILTER_LEN;
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m_modFilter.pState = m_modState;
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m_modFilter.pCoeffs = YSF_C4FSK_FILTER;
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}
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void CYSFTX::process()
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{
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if (m_buffer.getData() == 0U && m_poLen == 0U)
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return;
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if (m_poLen == 0U) {
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if (!m_tx) {
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m_count = 0U;
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for (uint16_t i = 0U; i < m_txDelay; i++)
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m_poBuffer[m_poLen++] = YSF_START_SYNC;
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} else {
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for (uint8_t i = 0U; i < YSF_FRAME_LENGTH_BYTES; i++) {
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uint8_t c = m_buffer.get();
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m_poBuffer[m_poLen++] = c;
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}
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}
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m_poPtr = 0U;
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}
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if (m_poLen > 0U) {
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uint16_t space = io.getSpace();
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while (space > (4U * YSF_RADIO_SYMBOL_LENGTH) && space < 1000U) {
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uint8_t c = m_poBuffer[m_poPtr++];
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writeByte(c);
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space -= 4U * YSF_RADIO_SYMBOL_LENGTH;
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if (m_poPtr >= m_poLen) {
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m_poPtr = 0U;
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m_poLen = 0U;
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return;
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}
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}
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}
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}
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uint8_t CYSFTX::writeData(const uint8_t* data, uint8_t length)
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{
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if (length != (YSF_FRAME_LENGTH_BYTES + 1U))
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return 4U;
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uint16_t space = m_buffer.getSpace();
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if (space < YSF_FRAME_LENGTH_BYTES)
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return 5U;
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for (uint8_t i = 0U; i < YSF_FRAME_LENGTH_BYTES; i++)
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m_buffer.put(data[i + 1U]);
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return 0U;
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}
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void CYSFTX::writeByte(uint8_t c)
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{
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q15_t inBuffer[YSF_RADIO_SYMBOL_LENGTH * 4U + 1U];
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q15_t outBuffer[YSF_RADIO_SYMBOL_LENGTH * 4U + 1U];
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const uint8_t MASK = 0xC0U;
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q15_t* p = inBuffer;
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for (uint8_t i = 0U; i < 4U; i++, c <<= 2, p += YSF_RADIO_SYMBOL_LENGTH) {
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switch (c & MASK) {
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case 0xC0U:
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::memcpy(p, YSF_A, YSF_RADIO_SYMBOL_LENGTH * sizeof(q15_t));
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break;
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case 0x80U:
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::memcpy(p, YSF_B, YSF_RADIO_SYMBOL_LENGTH * sizeof(q15_t));
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break;
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case 0x00U:
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::memcpy(p, YSF_C, YSF_RADIO_SYMBOL_LENGTH * sizeof(q15_t));
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break;
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default:
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::memcpy(p, YSF_D, YSF_RADIO_SYMBOL_LENGTH * sizeof(q15_t));
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break;
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}
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}
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uint16_t blockSize = YSF_RADIO_SYMBOL_LENGTH * 4U;
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// Handle the case of the oscillator not being accurate enough
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if (m_sampleCount > 0U) {
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m_count += YSF_RADIO_SYMBOL_LENGTH * 4U;
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if (m_count >= m_sampleCount) {
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if (m_sampleInsert) {
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inBuffer[YSF_RADIO_SYMBOL_LENGTH * 4U] = inBuffer[YSF_RADIO_SYMBOL_LENGTH * 4U - 1U];
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blockSize++;
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} else {
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blockSize--;
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}
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m_count -= m_sampleCount;
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}
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}
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::arm_fir_fast_q15(&m_modFilter, inBuffer, outBuffer, blockSize);
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io.write(outBuffer, blockSize);
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}
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void CYSFTX::setTXDelay(uint8_t delay)
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{
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m_txDelay = 240U + uint16_t(delay) * 12U; // 200ms + tx delay
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}
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uint16_t CYSFTX::getSpace() const
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{
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return m_buffer.getSpace() / YSF_FRAME_LENGTH_BYTES;
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}
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