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https://github.com/g4klx/MMDVMHost
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Start adding P25 frame (dis)assembly and repeater logic.
This commit is contained in:
Jonathan Naylor
268
P25Control.cpp
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268
P25Control.cpp
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/*
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* Copyright (C) 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 "P25Control.h"
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#include "P25Defines.h"
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#include "Sync.h"
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#include "Log.h"
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#include <cstdio>
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#include <cassert>
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const unsigned char BIT_MASK_TABLE[] = {0x80U, 0x40U, 0x20U, 0x10U, 0x08U, 0x04U, 0x02U, 0x01U};
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#define WRITE_BIT(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_BIT(p,i) (p[(i)>>3] & BIT_MASK_TABLE[(i)&7])
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CP25Control::CP25Control(unsigned int id, CDisplay* display, unsigned int timeout, bool duplex, int rssiMultiplier, int rssiOffset) :
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m_id(id),
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m_display(display),
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m_duplex(duplex),
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m_rssiMultiplier(rssiMultiplier),
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m_rssiOffset(rssiOffset),
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m_queue(1000U, "P25 Control"),
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m_rfState(RS_RF_LISTENING),
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m_netState(RS_NET_IDLE),
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m_rfTimeout(1000U, timeout),
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m_netTimeout(1000U, timeout),
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m_rfFrames(0U),
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m_rfBits(0U),
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m_rfErrs(0U)
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{
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assert(display != NULL);
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}
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CP25Control::~CP25Control()
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{
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}
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bool CP25Control::writeModem(unsigned char* data, unsigned int len)
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{
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assert(data != NULL);
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bool sync = data[1U] == 0x01U;
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if (data[0U] == TAG_LOST && m_rfState == RS_RF_LISTENING)
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return false;
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if (data[0U] == TAG_LOST) {
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LogMessage("P25, transmission lost, %.1f seconds, BER: %.1f%%", float(m_rfFrames) / 5.56F, float(m_rfErrs * 100U) / float(m_rfBits));
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m_rfState = RS_RF_LISTENING;
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m_rfTimeout.stop();
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return false;
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}
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if (!sync && m_rfState == RS_RF_LISTENING)
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return false;
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// Put into the NID decoder
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unsigned char duid = 0U; // XXX
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if (data[0U] == TAG_HEADER) {
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// Regenerate Sync
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CSync::addP25Sync(data + 2U);
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// Regenerate NID
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// Regenerate Enc Data
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// Add busy bits
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addBusyBits(data + 2U, P25_HDR_FRAME_LENGTH_BITS, false, true);
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m_rfFrames = 0U;
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m_rfErrs = 0U;
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m_rfBits = 1U;
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m_rfTimeout.start();
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if (m_duplex) {
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data[0U] = TAG_HEADER;
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data[1U] = 0x00U;
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writeQueueRF(data, P25_HDR_FRAME_LENGTH_BYTES + 2U);
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}
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LogMessage("P25, received RF header");
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} else if (duid == P25_DUID_LDU1) {
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if (m_rfState == RS_RF_LISTENING) {
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m_rfFrames = 0U;
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m_rfErrs = 0U;
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m_rfBits = 1U;
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m_rfTimeout.start();
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// Decode LDU1
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}
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// Regenerate Sync
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CSync::addP25Sync(data + 2U);
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// Regenerate NID
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// Regenerate LDU1 Data
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// Regenerate Audio
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unsigned int errors = 0U; // XXX
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LogDebug("P25, LDU1 audio, errs: %u/1233", errors);
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m_rfBits += 1233U;
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m_rfErrs += errors;
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m_rfFrames++;
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// Add busy bits
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addBusyBits(data + 2U, P25_LDU_FRAME_LENGTH_BITS, false, true);
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if (m_duplex) {
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data[0U] = TAG_DATA;
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data[1U] = 0x00U;
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writeQueueRF(data, P25_LDU_FRAME_LENGTH_BYTES + 2U);
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}
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if (m_rfState == RS_RF_LISTENING) {
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// LogMessage("P25, received RF LC from %8.8s/%4.4s to %8.8s", my1, my2, your);
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m_rfState = RS_RF_AUDIO;
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}
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} else if (duid == P25_DUID_LDU2) {
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if (m_rfState == RS_RF_LISTENING)
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return false;
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// Decode LDU2
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// Regenerate Sync
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CSync::addP25Sync(data + 2U);
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// Regenerate NID
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// Regenerate LDU2 Data
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// Regenerate Audio
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unsigned int errors = 0U; // XXX
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LogDebug("P25, LDU2 audio, errs: %u/1233", errors);
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m_rfBits += 1233U;
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m_rfErrs += errors;
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m_rfFrames++;
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// Add busy bits
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addBusyBits(data + 2U, P25_LDU_FRAME_LENGTH_BITS, false, true);
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if (m_duplex) {
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data[0U] = TAG_DATA;
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data[1U] = 0x00U;
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writeQueueRF(data, P25_LDU_FRAME_LENGTH_BYTES + 2U);
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}
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} else if (duid == P25_DUID_TERM_LC) {
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if (m_rfState == RS_RF_LISTENING)
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return false;
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// Regenerate Sync
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CSync::addP25Sync(data + 2U);
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// Regenerate NID
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// Regenerate LDU1 Data
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// Add busy bits
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addBusyBits(data + 2U, P25_TERMLC_FRAME_LENGTH_BITS, false, true);
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m_rfState = RS_RF_LISTENING;
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m_rfTimeout.stop();
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LogMessage("P25, received RF end of transmission, %.1f seconds, BER: %.1f%%", float(m_rfFrames) / 5.56F, float(m_rfErrs * 100U) / float(m_rfBits));
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if (m_duplex) {
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data[0U] = TAG_EOT;
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data[1U] = 0x00U;
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writeQueueRF(data, P25_TERMLC_FRAME_LENGTH_BYTES + 2U);
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}
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} else if (duid == P25_DUID_TERM) {
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if (m_rfState == RS_RF_LISTENING)
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return false;
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// Regenerate Sync
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CSync::addP25Sync(data + 2U);
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// Regenerate NID
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// Add busy bits
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addBusyBits(data + 2U, P25_TERM_FRAME_LENGTH_BITS, false, true);
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m_rfState = RS_RF_LISTENING;
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m_rfTimeout.stop();
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LogMessage("P25, received RF end of transmission, %.1f seconds, BER: %.1f%%", float(m_rfFrames) / 5.56F, float(m_rfErrs * 100U) / float(m_rfBits));
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if (m_duplex) {
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data[0U] = TAG_EOT;
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data[1U] = 0x00U;
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writeQueueRF(data, P25_TERM_FRAME_LENGTH_BYTES + 2U);
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}
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} else {
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return false;
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}
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return true;
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}
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unsigned int CP25Control::readModem(unsigned char* data)
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{
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assert(data != NULL);
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if (m_queue.isEmpty())
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return 0U;
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unsigned char len = 0U;
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m_queue.getData(&len, 1U);
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m_queue.getData(data, len);
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return len;
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}
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void CP25Control::clock(unsigned int ms)
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{
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m_rfTimeout.clock(ms);
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m_netTimeout.clock(ms);
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}
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void CP25Control::writeQueueRF(const unsigned char* data, unsigned int length)
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{
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assert(data != NULL);
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if (m_rfTimeout.isRunning() && m_rfTimeout.hasExpired())
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return;
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unsigned int space = m_queue.freeSpace();
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if (space < (length + 1U)) {
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LogError("P25, overflow in the P25 RF queue");
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return;
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}
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unsigned char len = length;
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m_queue.addData(&len, 1U);
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m_queue.addData(data, len);
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}
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void CP25Control::addBusyBits(unsigned char* data, unsigned int length, bool b1, bool b2)
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{
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assert(data != NULL);
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for (unsigned int i = 0U; i < length; i++) {
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if (i > 0U && (i % 70U) == 0U)
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WRITE_BIT(data, i, b1);
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if (i > 0U && (i % 71U) == 0U)
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WRITE_BIT(data, i, b2);
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}
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}
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