Andy CA6JAU
8 years ago
parent
84d3258a5d
commit
3788ad540f
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/*
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* Copyright (C) 2016,2017,2018 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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#if !defined(NXDNDEFINES_H)
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#define NXDNDEFINES_H
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const unsigned int NXDN_RADIO_SYMBOL_LENGTH = 10U; // At 24 kHz sample rate
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const unsigned int NXDN_FRAME_LENGTH_BITS = 384U;
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const unsigned int NXDN_FRAME_LENGTH_BYTES = NXDN_FRAME_LENGTH_BITS / 8U;
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const unsigned int NXDN_FRAME_LENGTH_SYMBOLS = NXDN_FRAME_LENGTH_BITS / 2U;
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const unsigned int NXDN_FRAME_LENGTH_SAMPLES = NXDN_FRAME_LENGTH_SYMBOLS * NXDN_RADIO_SYMBOL_LENGTH;
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const unsigned int NXDN_FSW_LENGTH_BITS = 20U;
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const unsigned int NXDN_FSW_LENGTH_SYMBOLS = NXDN_FSW_LENGTH_BITS / 2U;
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const unsigned int NXDN_FSW_LENGTH_SAMPLES = NXDN_FSW_LENGTH_SYMBOLS * NXDN_RADIO_SYMBOL_LENGTH;
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const uint8_t NXDN_FSW_BYTES[] = {0xCDU, 0xF5U, 0x90U};
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const uint8_t NXDN_FSW_BYTES_MASK[] = {0xFFU, 0xFFU, 0xF0U};
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const uint8_t NXDN_FSW_BYTES_LENGTH = 3U;
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const uint32_t NXDN_FSW_BITS = 0x000CDF59U;
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const uint32_t NXDN_FSW_BITS_MASK = 0x000FFFFFU;
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// C D F 5 9
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// 11 00 11 01 11 11 01 01 10 01
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// -3 +1 -3 +3 -3 -3 +3 +3 -1 +3
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const int8_t NXDN_FSW_SYMBOLS_VALUES[] = {-3, +1, -3, +3, -3, -3, +3, +3, -1, +3};
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const uint16_t NXDN_FSW_SYMBOLS = 0x014DU;
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const uint16_t NXDN_FSW_SYMBOLS_MASK = 0x03FFU;
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#endif
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@ -0,0 +1,139 @@
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/*
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* Copyright (C) 2009-2017,2018 by Jonathan Naylor G4KLX
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* Copyright (C) 2016,2017,2018 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 "NXDNRX.h"
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#include "Utils.h"
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const uint8_t MAX_FSW_BIT_START_ERRS = 1U;
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const uint8_t MAX_FSW_BIT_RUN_ERRS = 3U;
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const unsigned int MAX_FSW_FRAMES = 5U + 1U;
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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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CNXDNRX::CNXDNRX() :
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m_prev(false),
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m_state(NXDNRXS_NONE),
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m_bitBuffer(0x00U),
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m_outBuffer(),
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m_buffer(NULL),
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m_bufferPtr(0U),
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m_lostCount(0U)
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{
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m_buffer = m_outBuffer + 1U;
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}
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void CNXDNRX::reset()
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{
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m_prev = false;
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m_state = NXDNRXS_NONE;
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m_bitBuffer = 0x00U;
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m_bufferPtr = 0U;
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m_lostCount = 0U;
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}
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void CNXDNRX::databit(bool bit)
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{
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if (m_state == NXDNRXS_NONE)
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processNone(bit);
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else
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processData(bit);
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}
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void CNXDNRX::processNone(bool bit)
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{
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m_bitBuffer <<= 1;
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if (bit)
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m_bitBuffer |= 0x01U;
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// Fuzzy matching of the data sync bit sequence
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if (countBits64((m_bitBuffer & NXDN_FSW_BITS_MASK) ^ NXDN_FSW_BITS) <= MAX_FSW_BIT_START_ERRS) {
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DEBUG1("NXDNRX: sync found in None");
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for (uint8_t i = 0U; i < NXDN_FSW_BYTES_LENGTH; i++)
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m_buffer[i] = NXDN_FSW_BYTES[i];
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m_lostCount = MAX_FSW_FRAMES;
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m_bufferPtr = NXDN_FSW_LENGTH_BITS;
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m_state = NXDNRXS_DATA;
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io.setDecode(true);
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}
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}
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void CNXDNRX::processData(bool bit)
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{
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m_bitBuffer <<= 1;
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if (bit)
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m_bitBuffer |= 0x01U;
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WRITE_BIT1(m_buffer, m_bufferPtr, bit);
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m_bufferPtr++;
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// Only search for a sync in the right place +-2 symbols
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if (m_bufferPtr >= (NXDN_FSW_LENGTH_BITS - 2U) && m_bufferPtr <= (NXDN_FSW_LENGTH_BITS + 2U)) {
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// Fuzzy matching of the data sync bit sequence
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if (countBits64((m_bitBuffer & NXDN_FSW_BITS_MASK) ^ NXDN_FSW_BITS) <= MAX_FSW_BIT_RUN_ERRS) {
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DEBUG2("NXDNRX: found sync in Data, pos", m_bufferPtr - NXDN_FSW_LENGTH_BITS);
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m_lostCount = MAX_FSW_FRAMES;
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m_bufferPtr = NXDN_FSW_LENGTH_BITS;
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}
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}
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// Send a data frame to the host if the required number of bits have been received
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if (m_bufferPtr == NXDN_FRAME_LENGTH_BITS) {
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// We've not seen a data sync for too long, signal RXLOST and change to RX_NONE
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m_lostCount--;
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if (m_lostCount == 0U) {
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DEBUG1("NXDNRX: sync timed out, lost lock");
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io.setDecode(false);
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serial.writeNXDNLost();
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m_state = NXDNRXS_NONE;
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} else {
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m_outBuffer[0U] = m_lostCount == (MAX_FSW_FRAMES - 1U) ? 0x01U : 0x00U;
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writeRSSIData(m_outBuffer);
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// Start the next frame
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::memset(m_outBuffer, 0x00U, NXDN_FRAME_LENGTH_BYTES + 3U);
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m_bufferPtr = 0U;
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}
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}
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}
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void CNXDNRX::writeRSSIData(uint8_t* data)
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{
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#if defined(SEND_RSSI_DATA)
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uint16_t rssi = io.readRSSI();
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data[49U] = (rssi >> 8) & 0xFFU;
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data[50U] = (rssi >> 0) & 0xFFU;
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serial.writeNXDNData(data, NXDN_FRAME_LENGTH_BYTES + 3U);
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#else
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serial.writeNXDNData(data, NXDN_FRAME_LENGTH_BYTES + 1U);
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#endif
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}
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@ -0,0 +1,54 @@
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/*
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* Copyright (C) 2015,2016,2017,2018 by Jonathan Naylor G4KLX
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* Copyright (C) 2016,2017,2018 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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#if !defined(NXDNRX_H)
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#define NXDNRX_H
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#include "NXDNDefines.h"
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enum NXDNRX_STATE {
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NXDNRXS_NONE,
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NXDNRXS_DATA
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};
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class CNXDNRX {
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public:
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CNXDNRX();
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void databit(bool bit);
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void reset();
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private:
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bool m_prev;
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NXDNRX_STATE m_state;
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uint64_t m_bitBuffer;
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uint8_t m_outBuffer[NXDN_FRAME_LENGTH_BYTES + 3U];
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uint8_t* m_buffer;
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uint16_t m_bufferPtr;
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uint16_t m_lostCount;
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void processNone(bool bit);
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void processData(bool bit);
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void writeRSSIData(uint8_t* data);
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};
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#endif
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@ -0,0 +1,120 @@
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/*
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* Copyright (C) 2009-2016,2018 by Jonathan Naylor G4KLX
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* Copyright (C) 2016,2017,2018 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 "NXDNTX.h"
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#include "NXDNDefines.h"
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const uint8_t NXDN_PREAMBLE[] = {0x57U, 0x75U, 0xFDU};
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const uint8_t NXDN_SYNC = 0x5FU;
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CNXDNTX::CNXDNTX() :
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m_buffer(1500U),
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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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m_count(0U)
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{
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}
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void CNXDNTX::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_delay = true;
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m_count = 0U;
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m_poLen = m_txDelay;
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} else {
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m_delay = false;
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for (uint8_t i = 0U; i < NXDN_FRAME_LENGTH_BYTES; i++)
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m_poBuffer[m_poLen++] = m_buffer.get();
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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 > 8U) {
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if (m_delay) {
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m_poPtr++;
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writeByte(NXDN_SYNC);
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}
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else
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writeByte(m_poBuffer[m_poPtr++]);
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space -= 8U;
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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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m_delay = false;
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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 CNXDNTX::writeData(const uint8_t* data, uint8_t length)
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{
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if (length != (NXDN_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 < NXDN_FRAME_LENGTH_BYTES)
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return 5U;
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for (uint8_t i = 0U; i < NXDN_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 CNXDNTX::writeByte(uint8_t c)
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{
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uint8_t bit;
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uint8_t mask = 0x80U;
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for (uint8_t i = 0U; i < 8U; i++, c <<= 1) {
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if ((c & mask) == mask)
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bit = 1U;
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else
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bit = 0U;
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io.write(&bit, 1);
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}
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}
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void CNXDNTX::setTXDelay(uint8_t delay)
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{
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m_txDelay = 300U + uint16_t(delay) * 6U; // 500ms + tx delay
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}
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uint16_t CNXDNTX::getSpace() const
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{
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return m_buffer.getSpace() / NXDN_FRAME_LENGTH_BYTES;
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}
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@ -0,0 +1,50 @@
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/*
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* Copyright (C) 2015,2016,2017,2018 by Jonathan Naylor G4KLX
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* Copyright (C) 2016,2017,2018 by Andy Uribe CA6JAU
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*
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* This program is free software; you can redistribute it and/or modify
|
||||
* it under the terms of the GNU General Public License as published by
|
||||
* the Free Software Foundation; either version 2 of the License, or
|
||||
* (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,
|
||||
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
||||
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
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* GNU General Public License for more details.
|
||||
*
|
||||
* You should have received a copy of the GNU General Public License
|
||||
* along with this program; if not, write to the Free Software
|
||||
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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#if !defined(NXDNTX_H)
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#define NXDNTX_H
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#include "SerialRB.h"
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class CNXDNTX {
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public:
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CNXDNTX();
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uint8_t writeData(const uint8_t* data, uint8_t length);
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void process();
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void setTXDelay(uint8_t delay);
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uint16_t getSpace() const;
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private:
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CSerialRB m_buffer;
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uint8_t m_poBuffer[60U];
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uint16_t m_poLen;
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uint16_t m_poPtr;
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uint16_t m_txDelay;
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uint32_t m_count;
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bool m_delay;
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void writeByte(uint8_t c);
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};
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#endif
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Reference in new issue