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https://github.com/g4klx/MMDVM.git
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694b83123a
In to NXDN possible problem on sinc filter anc isinc filter, think they must be recalculated but do not know how to do it. On D-STAR, DMR, C4FM and P25 it work.
129 lines
3.1 KiB
C++
129 lines
3.1 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 "CalDStarRX.h"
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#include "Utils.h"
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const unsigned int BUFFER_LENGTH = 200U;
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const uint32_t PLLMAX = 0x10000U;
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const uint32_t PLLINC = PLLMAX / DSTAR_RADIO_SYMBOL_LENGTH;
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const uint32_t INC = PLLINC / 32U;
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// D-Star bit order version of 0x55 0x2D 0x16
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const uint32_t DATA_SYNC_DATA1 = 0x00AAB468U;
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const uint32_t DATA_SYNC_DATA2 = 0x00554B97U;
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const uint32_t DATA_SYNC_MASK = 0x00FFFFFFU;
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const uint8_t DATA_SYNC_ERRS = 2U;
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CCalDStarRX::CCalDStarRX() :
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m_pll(0U),
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m_prev(false),
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m_patternBuffer(0x00U),
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m_rxBuffer(),
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m_ptr(0U)
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{
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}
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void CCalDStarRX::samples(const q15_t* samples, uint8_t length)
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{
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for (uint16_t i = 0U; i < length; i++) {
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bool bit = samples[i] < 0;
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if (bit != m_prev) {
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if (m_pll < (PLLMAX / 2U))
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m_pll += INC;
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else
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m_pll -= INC;
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}
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m_prev = bit;
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m_pll += PLLINC;
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if (m_pll >= PLLMAX) {
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m_pll -= PLLMAX;
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process(samples[i]);
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}
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}
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}
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void CCalDStarRX::process(q15_t value)
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{
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m_patternBuffer <<= 1;
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if (value < 0)
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m_patternBuffer |= 0x01U;
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m_rxBuffer[m_ptr++] = value;
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if (m_ptr >= 24U)
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m_ptr = 0U;
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if (countBits32((m_patternBuffer & DATA_SYNC_MASK) ^ DATA_SYNC_DATA1) <= DATA_SYNC_ERRS) {
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q15_t max = -16000;
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q15_t min = 16000;
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for (uint8_t i = 0U; i < 24U; i++) {
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q15_t value = m_rxBuffer[i];
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if (value > max)
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max = value;
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if (value < min)
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min = value;
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}
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if ((max - min) > 5) {
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uint8_t buffer[5U];
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buffer[0U] = 0x00U;
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buffer[1U] = (max >> 8) & 0xFFU;
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buffer[2U] = (max >> 0) & 0xFFU;
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buffer[3U] = (min >> 8) & 0xFFU;
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buffer[4U] = (min >> 0) & 0xFFU;
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serial.writeCalData(buffer, 5U);
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}
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}
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if (countBits32((m_patternBuffer & DATA_SYNC_MASK) ^ DATA_SYNC_DATA2) <= DATA_SYNC_ERRS) {
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q15_t max = -16000;
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q15_t min = 16000;
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for (uint8_t i = 0U; i < 24U; i++) {
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q15_t value = m_rxBuffer[i];
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if (value > max)
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max = value;
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if (value < min)
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min = value;
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}
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if ((max - min) > 5) {
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uint8_t buffer[5U];
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buffer[0U] = 0x80U;
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buffer[1U] = (max >> 8) & 0xFFU;
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buffer[2U] = (max >> 0) & 0xFFU;
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buffer[3U] = (min >> 8) & 0xFFU;
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buffer[4U] = (min >> 0) & 0xFFU;
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serial.writeCalData(buffer, 5U);
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}
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}
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}
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