384 lines
8.7 KiB
C++
384 lines
8.7 KiB
C++
/*
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* Copyright (C) 2018 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; version 2 of the License.
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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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#include "POCSAGControl.h"
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#include "Utils.h"
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#include "Log.h"
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#include <cstdio>
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#include <cassert>
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#include <cstring>
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#include <ctime>
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// #define DUMP_POCSAG
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const struct BCD {
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char m_c;
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uint32_t m_bcd[5U];
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} BCD_VALUES[] = {
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{ '0', {0x00000000U, 0x00000000U, 0x00000000U, 0x00000000U, 0x00000000U}},
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{ '1', {0x40000000U, 0x04000000U, 0x00400000U, 0x00040000U, 0x00004000U}},
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{ '2', {0x20000000U, 0x02000000U, 0x00200000U, 0x00020000U, 0x00002000U}},
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{ '3', {0x60000000U, 0x06000000U, 0x00600000U, 0x00060000U, 0x00006000U}},
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{ '4', {0x10000000U, 0x01000000U, 0x00100000U, 0x00010000U, 0x00001000U}},
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{ '5', {0x50000000U, 0x05000000U, 0x00500000U, 0x00050000U, 0x00005000U}},
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{ '6', {0x30000000U, 0x03000000U, 0x00300000U, 0x00030000U, 0x00003000U}},
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{ '7', {0x70000000U, 0x07000000U, 0x00700000U, 0x00070000U, 0x00007000U}},
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{ '8', {0x08000000U, 0x00800000U, 0x00080000U, 0x00008000U, 0x00000800U}},
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{ '9', {0x48000000U, 0x04800000U, 0x00480000U, 0x00048000U, 0x00004800U}},
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{ 'U', {0x68000000U, 0x06800000U, 0x00680000U, 0x00068000U, 0x00006800U}},
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{ ' ', {0x18000000U, 0x01800000U, 0x00180000U, 0x00018000U, 0x00001800U}},
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{ '-', {0x58000000U, 0x05800000U, 0x00580000U, 0x00058000U, 0x00005800U}},
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{ ')', {0x38000000U, 0x03800000U, 0x00380000U, 0x00038000U, 0x00003800U}},
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{ '(', {0x78000000U, 0x07800000U, 0x00780000U, 0x00078000U, 0x00007800U}},
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{ 0, {0x00000000U, 0x00000000U, 0x00000000U, 0x00000000U, 0x00000000U}}
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};
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const uint32_t BCD_SPACES[] = {0x19999800U, 0x01999800U, 0x00199800U, 0x00019800U, 0x00001800U};
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const uint32_t DATA_MASK[] = { 0x40000000U, 0x20000000U, 0x10000000U,
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0x08000000U, 0x04000000U, 0x02000000U, 0x01000000U,
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0x00800000U, 0x00400000U, 0x00200000U, 0x00100000U,
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0x00080000U, 0x00040000U, 0x00020000U, 0x00010000U,
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0x00008000U, 0x00004000U, 0x00002000U, 0x00001000U,
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0x00000800U};
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const unsigned char FUNCTIONAL_NUMERIC = 0U;
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const unsigned char FUNCTIONAL_ALPHANUMERIC = 3U;
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CPOCSAGControl::CPOCSAGControl(CPOCSAGNetwork* network, CDisplay* display) :
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m_network(network),
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m_display(display),
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m_queue(5000U, "POCSAG Control"),
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m_frames(0U),
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m_count(0U),
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m_output(),
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m_buffer(),
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m_ric(0U),
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m_text(),
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m_state(PS_NONE),
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m_fp(NULL)
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{
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assert(display != NULL);
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}
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CPOCSAGControl::~CPOCSAGControl()
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{
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m_output.clear();
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m_buffer.clear();
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}
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unsigned int CPOCSAGControl::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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bool CPOCSAGControl::processData()
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{
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assert(m_network != NULL);
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unsigned char data[300U];
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unsigned int length = m_network->read(data);
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if (length == 0U)
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return false;
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m_ric = 0U;
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m_ric |= (data[0U] << 16) & 0x00FF0000U;
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m_ric |= (data[1U] << 8) & 0x0000FF00U;
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m_ric |= (data[2U] << 0) & 0x000000FFU;
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unsigned char functional = data[3U];
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m_text = std::string((char*)(data + 4U), length - 4U);
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LogDebug("Message to %07u, func %s: \"%s\"", m_ric, functional == FUNCTIONAL_NUMERIC ? "Numeric" : "Alphanumeric", m_text.c_str());
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m_buffer.clear();
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addAddress(functional);
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if (functional == FUNCTIONAL_ALPHANUMERIC)
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packASCII();
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else
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packNumeric();
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// Ensure data is an even number of words
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if ((m_buffer.size() % 2U) == 1U)
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m_buffer.push_back(POCSAG_IDLE_WORD);
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return true;
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}
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void CPOCSAGControl::clock(unsigned int ms)
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{
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if (m_state == PS_NONE) {
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bool ret = processData();
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if (!ret)
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return;
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m_display->writePOCSAG(m_ric, m_text);
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m_state = PS_WAITING;
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m_frames = 0U;
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m_count = 1U;
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#if defined(DUMP_POCSAG)
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openFile();
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#endif
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}
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m_output.clear();
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m_output.push_back(POCSAG_SYNC_WORD);
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for (unsigned int i = 0U; i < POCSAG_FRAME_ADDRESSES; i++) {
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if (m_state == PS_WAITING) {
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if (i == (m_ric % POCSAG_FRAME_ADDRESSES)) {
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uint32_t w1 = m_buffer.front();
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m_buffer.pop_front();
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uint32_t w2 = m_buffer.front();
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m_buffer.pop_front();
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m_output.push_back(w1);
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m_output.push_back(w2);
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m_state = PS_SENDING;
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} else {
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m_output.push_back(POCSAG_IDLE_WORD);
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m_output.push_back(POCSAG_IDLE_WORD);
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}
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} else if (m_state == PS_SENDING) {
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if (m_buffer.empty()) {
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m_output.push_back(POCSAG_IDLE_WORD);
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m_output.push_back(POCSAG_IDLE_WORD);
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bool ret = processData();
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if (ret) {
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m_display->writePOCSAG(m_ric, m_text);
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m_state = PS_WAITING;
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m_count++;
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} else {
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m_state = PS_ENDING;
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}
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} else {
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uint32_t w1 = m_buffer.front();
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m_buffer.pop_front();
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uint32_t w2 = m_buffer.front();
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m_buffer.pop_front();
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m_output.push_back(w1);
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m_output.push_back(w2);
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}
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} else { // PS_ENDING
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m_output.push_back(POCSAG_IDLE_WORD);
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m_output.push_back(POCSAG_IDLE_WORD);
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}
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}
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writeQueue();
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m_frames++;
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if (m_state == PS_ENDING) {
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LogMessage("POCSAG, transmitted %u frame(s) of data from %u message(s)", m_frames, m_count);
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m_display->clearPOCSAG();
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m_state = PS_NONE;
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#if defined(DUMP_POCSAG)
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closeFile();
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#endif
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}
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}
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void CPOCSAGControl::addAddress(unsigned char functional)
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{
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uint32_t word = 0x00000000U;
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if (functional == FUNCTIONAL_ALPHANUMERIC)
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word = 0x00001800U;
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word |= (m_ric / POCSAG_FRAME_ADDRESSES) << 13;
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addBCHAndParity(word);
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m_buffer.push_back(word);
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}
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void CPOCSAGControl::packASCII()
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{
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const unsigned char MASK = 0x01U;
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uint32_t word = 0x80000000U;
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unsigned int n = 0U;
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for (std::string::const_iterator it = m_text.cbegin(); it != m_text.cend(); ++it) {
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unsigned char c = *it;
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for (unsigned int j = 0U; j < 7U; j++, c >>= 1) {
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bool b = (c & MASK) == MASK;
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if (b)
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word |= DATA_MASK[n];
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n++;
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if (n == 20U) {
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addBCHAndParity(word);
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m_buffer.push_back(word);
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word = 0x80000000U;
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n = 0U;
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}
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}
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}
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if (n > 0U) {
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addBCHAndParity(word);
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m_buffer.push_back(word);
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}
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}
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void CPOCSAGControl::packNumeric()
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{
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uint32_t word = 0x80000000U;
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unsigned int n = 0U;
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for (std::string::const_iterator it = m_text.cbegin(); it != m_text.cend(); ++it) {
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char c = *it;
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const BCD* bcd = NULL;
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for (unsigned int i = 0U; BCD_VALUES[i].m_c != 0; i++) {
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if (BCD_VALUES[i].m_c == c) {
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bcd = BCD_VALUES + i;
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break;
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}
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}
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if (bcd != NULL) {
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word |= bcd->m_bcd[n];
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n++;
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if (n == 5U) {
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addBCHAndParity(word);
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m_buffer.push_back(word);
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word = 0x80000000U;
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n = 0U;
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}
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}
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}
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// Pack the remainder of the word with BCD spaces.
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if (n != 0U) {
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word |= BCD_SPACES[n];
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addBCHAndParity(word);
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m_buffer.push_back(word);
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}
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}
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void CPOCSAGControl::addBCHAndParity(uint32_t& word) const
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{
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uint32_t temp = word;
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for (unsigned int i = 0U; i < 21U; i++, temp <<= 1) {
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if (temp & 0x80000000U)
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temp ^= 0xED200000U;
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}
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word |= (temp >> 21);
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temp = word;
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unsigned int parity = 0U;
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for (unsigned int i = 0U; i < 32U; i++, temp <<= 1) {
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if (temp & 0x80000000U)
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parity++;
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}
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if ((parity % 2U) == 1U)
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word |= 0x00000001U;
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}
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void CPOCSAGControl::writeQueue()
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{
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// Convert 32-bit words to bytes
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unsigned char data[POCSAG_FRAME_LENGTH_BYTES];
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unsigned char len = 0U;
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for (std::deque<uint32_t>::const_iterator it = m_output.cbegin(); it != m_output.cend(); ++it) {
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uint32_t word = *it;
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data[len++] = word >> 24;
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data[len++] = word >> 16;
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data[len++] = word >> 8;
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data[len++] = word >> 0;
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}
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m_output.clear();
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#if defined(DUMP_POCSAG)
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writeFile(data);
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#endif
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CUtils::dump(1U, "Data to MMDVM", data, len);
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assert(len == POCSAG_FRAME_LENGTH_BYTES);
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unsigned int space = m_queue.freeSpace();
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if (space < (len + 1U)) {
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LogError("POCSAG, overflow in the POCSAG RF queue");
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return;
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}
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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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bool CPOCSAGControl::openFile()
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{
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if (m_fp != NULL)
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return true;
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time_t t;
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::time(&t);
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struct tm* tm = ::localtime(&t);
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char name[100U];
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::sprintf(name, "POCSAG_%04d%02d%02d_%02d%02d%02d.ambe", tm->tm_year + 1900, tm->tm_mon + 1, tm->tm_mday, tm->tm_hour, tm->tm_min, tm->tm_sec);
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m_fp = ::fopen(name, "wb");
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if (m_fp == NULL)
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return false;
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::fwrite("POCSAG", 1U, 6U, m_fp);
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return true;
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}
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bool CPOCSAGControl::writeFile(const unsigned char* data)
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{
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if (m_fp == NULL)
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return false;
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::fwrite(data, 1U, POCSAG_FRAME_LENGTH_BYTES, m_fp);
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return true;
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}
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void CPOCSAGControl::closeFile()
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{
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if (m_fp != NULL) {
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::fclose(m_fp);
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m_fp = NULL;
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}
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}
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