mirror of https://github.com/markqvist/MMDVM.git
157 lines
4.2 KiB
C++
157 lines
4.2 KiB
C++
/*
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* Copyright (C) 2009-2017 by Jonathan Naylor G4KLX
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* Copyright (C) 2016 by Colin Durbridge G4EML
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* Copyright (C) 2017 by Andy Uribe CA6JAU
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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 "DMRSlotType.h"
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// Generated using rcosdesign(0.2, 8, 5, 'sqrt') in MATLAB
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static q15_t RRC_0_2_FILTER[] = {0, 0, 0, 0, 850, 219, -720, -1548, -1795, -1172, 237, 1927, 3120, 3073, 1447, -1431, -4544, -6442,
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-5735, -1633, 5651, 14822, 23810, 30367, 32767, 30367, 23810, 14822, 5651, -1633, -5735, -6442,
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-4544, -1431, 1447, 3073, 3120, 1927, 237, -1172, -1795, -1548, -720, 219, 850}; // numTaps = 45, L = 5
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const uint16_t RRC_0_2_FILTER_PHASE_LEN = 9U; // phaseLength = numTaps/L
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const q15_t DMR_LEVELA = 1362;
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const q15_t DMR_LEVELB = 454;
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const q15_t DMR_LEVELC = -454;
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const q15_t DMR_LEVELD = -1362;
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const uint8_t BIT_MASK_TABLE[] = {0x80U, 0x40U, 0x20U, 0x10U, 0x08U, 0x04U, 0x02U, 0x01U};
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#define WRITE_BIT1(p,i,b) p[(i)>>3] = (b) ? (p[(i)>>3] | BIT_MASK_TABLE[(i)&7]) : (p[(i)>>3] & ~BIT_MASK_TABLE[(i)&7])
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#define READ_BIT1(p,i) (p[(i)>>3] & BIT_MASK_TABLE[(i)&7])
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const uint8_t DMR_SYNC = 0x5FU;
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CDMRDMOTX::CDMRDMOTX() :
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m_fifo(),
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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(240U) // 200ms
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{
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::memset(m_modState, 0x00U, 16U * sizeof(q15_t));
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m_modFilter.L = DMR_RADIO_SYMBOL_LENGTH;
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m_modFilter.phaseLength = RRC_0_2_FILTER_PHASE_LEN;
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m_modFilter.pCoeffs = RRC_0_2_FILTER;
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m_modFilter.pState = m_modState;
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}
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void CDMRDMOTX::process()
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{
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if (m_poLen == 0U && m_fifo.getData() > 0U) {
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if (!m_tx) {
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for (uint16_t i = 0U; i < m_txDelay; i++)
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m_poBuffer[i] = DMR_SYNC;
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m_poLen = m_txDelay;
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} else {
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for (unsigned int i = 0U; i < 72U; i++)
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m_poBuffer[i] = DMR_SYNC;
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for (unsigned int i = 0U; i < DMR_FRAME_LENGTH_BYTES; i++)
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m_poBuffer[i + 39U] = m_fifo.get();
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m_poLen = 72U;
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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 * DMR_RADIO_SYMBOL_LENGTH)) {
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uint8_t c = m_poBuffer[m_poPtr++];
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writeByte(c);
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space -= 4U * DMR_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 CDMRDMOTX::writeData(const uint8_t* data, uint8_t length)
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{
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if (length != (DMR_FRAME_LENGTH_BYTES + 1U))
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return 4U;
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uint16_t space = m_fifo.getSpace();
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if (space < DMR_FRAME_LENGTH_BYTES)
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return 5U;
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for (uint8_t i = 0U; i < DMR_FRAME_LENGTH_BYTES; i++)
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m_fifo.put(data[i + 1U]);
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return 0U;
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}
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void CDMRDMOTX::writeByte(uint8_t c)
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{
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q15_t inBuffer[4U];
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q15_t outBuffer[DMR_RADIO_SYMBOL_LENGTH * 4U];
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const uint8_t MASK = 0xC0U;
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for (uint8_t i = 0U; i < 4U; i++, c <<= 2) {
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switch (c & MASK) {
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case 0xC0U:
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inBuffer[i] = DMR_LEVELA;
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break;
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case 0x80U:
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inBuffer[i] = DMR_LEVELB;
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break;
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case 0x00U:
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inBuffer[i] = DMR_LEVELC;
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break;
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default:
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inBuffer[i] = DMR_LEVELD;
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break;
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}
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}
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::arm_fir_interpolate_q15(&m_modFilter, inBuffer, outBuffer, 4U);
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io.write(STATE_DMR, outBuffer, DMR_RADIO_SYMBOL_LENGTH * 4U);
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}
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uint8_t CDMRDMOTX::getSpace() const
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{
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return m_fifo.getSpace() / (DMR_FRAME_LENGTH_BYTES + 2U);
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}
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void CDMRDMOTX::setTXDelay(uint8_t delay)
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{
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m_txDelay = 600U + uint16_t(delay) * 12U; // 500ms + tx delay
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if (m_txDelay > 1200U)
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m_txDelay = 1200U;
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}
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