mirror of
https://github.com/ShaYmez/MMDVM_CM.git
synced 2024-11-18 06:01:46 -05:00
323 lines
7.7 KiB
C++
323 lines
7.7 KiB
C++
/*
|
|
* Copyright (C) 2015,2016,2017 by Jonathan Naylor G4KLX
|
|
*
|
|
* 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.
|
|
*
|
|
* 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
|
|
* 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.
|
|
*/
|
|
|
|
#include "DMREmbeddedData.h"
|
|
|
|
#include "Hamming.h"
|
|
#include "Utils.h"
|
|
#include "CRC.h"
|
|
|
|
#include <cstdio>
|
|
#include <cassert>
|
|
#include <cstring>
|
|
|
|
CDMREmbeddedData::CDMREmbeddedData() :
|
|
m_raw(NULL),
|
|
m_state(LCS_NONE),
|
|
m_data(NULL),
|
|
m_FLCO(FLCO_GROUP),
|
|
m_valid(false)
|
|
{
|
|
m_raw = new bool[128U];
|
|
m_data = new bool[72U];
|
|
}
|
|
|
|
CDMREmbeddedData::~CDMREmbeddedData()
|
|
{
|
|
delete[] m_raw;
|
|
delete[] m_data;
|
|
}
|
|
|
|
// Add LC data (which may consist of 4 blocks) to the data store
|
|
bool CDMREmbeddedData::addData(const unsigned char* data, unsigned char lcss)
|
|
{
|
|
assert(data != NULL);
|
|
|
|
bool rawData[40U];
|
|
CUtils::byteToBitsBE(data[14U], rawData + 0U);
|
|
CUtils::byteToBitsBE(data[15U], rawData + 8U);
|
|
CUtils::byteToBitsBE(data[16U], rawData + 16U);
|
|
CUtils::byteToBitsBE(data[17U], rawData + 24U);
|
|
CUtils::byteToBitsBE(data[18U], rawData + 32U);
|
|
|
|
// Is this the first block of a 4 block embedded LC ?
|
|
if (lcss == 1U) {
|
|
for (unsigned int a = 0U; a < 32U; a++)
|
|
m_raw[a] = rawData[a + 4U];
|
|
|
|
// Show we are ready for the next LC block
|
|
m_state = LCS_FIRST;
|
|
m_valid = false;
|
|
|
|
return false;
|
|
}
|
|
|
|
// Is this the 2nd block of a 4 block embedded LC ?
|
|
if (lcss == 3U && m_state == LCS_FIRST) {
|
|
for (unsigned int a = 0U; a < 32U; a++)
|
|
m_raw[a + 32U] = rawData[a + 4U];
|
|
|
|
// Show we are ready for the next LC block
|
|
m_state = LCS_SECOND;
|
|
|
|
return false;
|
|
}
|
|
|
|
// Is this the 3rd block of a 4 block embedded LC ?
|
|
if (lcss == 3U && m_state == LCS_SECOND) {
|
|
for (unsigned int a = 0U; a < 32U; a++)
|
|
m_raw[a + 64U] = rawData[a + 4U];
|
|
|
|
// Show we are ready for the final LC block
|
|
m_state = LCS_THIRD;
|
|
|
|
return false;
|
|
}
|
|
|
|
// Is this the final block of a 4 block embedded LC ?
|
|
if (lcss == 2U && m_state == LCS_THIRD) {
|
|
for (unsigned int a = 0U; a < 32U; a++)
|
|
m_raw[a + 96U] = rawData[a + 4U];
|
|
|
|
// Show that we're not ready for any more data
|
|
m_state = LCS_NONE;
|
|
|
|
// Process the complete data block
|
|
decodeEmbeddedData();
|
|
if (m_valid)
|
|
encodeEmbeddedData();
|
|
|
|
return m_valid;
|
|
}
|
|
|
|
return false;
|
|
}
|
|
|
|
void CDMREmbeddedData::setLC(const CDMRLC& lc)
|
|
{
|
|
lc.getData(m_data);
|
|
|
|
m_FLCO = lc.getFLCO();
|
|
m_valid = true;
|
|
|
|
encodeEmbeddedData();
|
|
}
|
|
|
|
void CDMREmbeddedData::encodeEmbeddedData()
|
|
{
|
|
unsigned int crc;
|
|
CCRC::encodeFiveBit(m_data, crc);
|
|
|
|
bool data[128U];
|
|
::memset(data, 0x00U, 128U * sizeof(bool));
|
|
|
|
data[106U] = (crc & 0x01U) == 0x01U;
|
|
data[90U] = (crc & 0x02U) == 0x02U;
|
|
data[74U] = (crc & 0x04U) == 0x04U;
|
|
data[58U] = (crc & 0x08U) == 0x08U;
|
|
data[42U] = (crc & 0x10U) == 0x10U;
|
|
|
|
unsigned int b = 0U;
|
|
for (unsigned int a = 0U; a < 11U; a++, b++)
|
|
data[a] = m_data[b];
|
|
for (unsigned int a = 16U; a < 27U; a++, b++)
|
|
data[a] = m_data[b];
|
|
for (unsigned int a = 32U; a < 42U; a++, b++)
|
|
data[a] = m_data[b];
|
|
for (unsigned int a = 48U; a < 58U; a++, b++)
|
|
data[a] = m_data[b];
|
|
for (unsigned int a = 64U; a < 74U; a++, b++)
|
|
data[a] = m_data[b];
|
|
for (unsigned int a = 80U; a < 90U; a++, b++)
|
|
data[a] = m_data[b];
|
|
for (unsigned int a = 96U; a < 106U; a++, b++)
|
|
data[a] = m_data[b];
|
|
|
|
// Hamming (16,11,4) check each row except the last one
|
|
for (unsigned int a = 0U; a < 112U; a += 16U)
|
|
CHamming::encode16114(data + a);
|
|
|
|
// Add the parity bits for each column
|
|
for (unsigned int a = 0U; a < 16U; a++)
|
|
data[a + 112U] = data[a + 0U] ^ data[a + 16U] ^ data[a + 32U] ^ data[a + 48U] ^ data[a + 64U] ^ data[a + 80U] ^ data[a + 96U];
|
|
|
|
// The data is packed downwards in columns
|
|
b = 0U;
|
|
for (unsigned int a = 0U; a < 128U; a++) {
|
|
m_raw[a] = data[b];
|
|
b += 16U;
|
|
if (b > 127U)
|
|
b -= 127U;
|
|
}
|
|
}
|
|
|
|
unsigned char CDMREmbeddedData::getData(unsigned char* data, unsigned char n) const
|
|
{
|
|
assert(data != NULL);
|
|
|
|
if (n >= 1U && n < 5U) {
|
|
n--;
|
|
|
|
bool bits[40U];
|
|
::memset(bits, 0x00U, 40U * sizeof(bool));
|
|
::memcpy(bits + 4U, m_raw + n * 32U, 32U * sizeof(bool));
|
|
|
|
unsigned char bytes[5U];
|
|
CUtils::bitsToByteBE(bits + 0U, bytes[0U]);
|
|
CUtils::bitsToByteBE(bits + 8U, bytes[1U]);
|
|
CUtils::bitsToByteBE(bits + 16U, bytes[2U]);
|
|
CUtils::bitsToByteBE(bits + 24U, bytes[3U]);
|
|
CUtils::bitsToByteBE(bits + 32U, bytes[4U]);
|
|
|
|
data[14U] = (data[14U] & 0xF0U) | (bytes[0U] & 0x0FU);
|
|
data[15U] = bytes[1U];
|
|
data[16U] = bytes[2U];
|
|
data[17U] = bytes[3U];
|
|
data[18U] = (data[18U] & 0x0FU) | (bytes[4U] & 0xF0U);
|
|
|
|
switch (n) {
|
|
case 0U:
|
|
return 1U;
|
|
case 3U:
|
|
return 2U;
|
|
default:
|
|
return 3U;
|
|
}
|
|
} else {
|
|
data[14U] &= 0xF0U;
|
|
data[15U] = 0x00U;
|
|
data[16U] = 0x00U;
|
|
data[17U] = 0x00U;
|
|
data[18U] &= 0x0FU;
|
|
|
|
return 0U;
|
|
}
|
|
}
|
|
|
|
// Unpack and error check an embedded LC
|
|
void CDMREmbeddedData::decodeEmbeddedData()
|
|
{
|
|
// The data is unpacked downwards in columns
|
|
bool data[128U];
|
|
::memset(data, 0x00U, 128U * sizeof(bool));
|
|
|
|
unsigned int b = 0U;
|
|
for (unsigned int a = 0U; a < 128U; a++) {
|
|
data[b] = m_raw[a];
|
|
b += 16U;
|
|
if (b > 127U)
|
|
b -= 127U;
|
|
}
|
|
|
|
// Hamming (16,11,4) check each row except the last one
|
|
for (unsigned int a = 0U; a < 112U; a += 16U) {
|
|
if (!CHamming::decode16114(data + a))
|
|
return;
|
|
}
|
|
|
|
// Check the parity bits
|
|
for (unsigned int a = 0U; a < 16U; a++) {
|
|
bool parity = data[a + 0U] ^ data[a + 16U] ^ data[a + 32U] ^ data[a + 48U] ^ data[a + 64U] ^ data[a + 80U] ^ data[a + 96U] ^ data[a + 112U];
|
|
if (parity)
|
|
return;
|
|
}
|
|
|
|
// We have passed the Hamming check so extract the actual payload
|
|
b = 0U;
|
|
for (unsigned int a = 0U; a < 11U; a++, b++)
|
|
m_data[b] = data[a];
|
|
for (unsigned int a = 16U; a < 27U; a++, b++)
|
|
m_data[b] = data[a];
|
|
for (unsigned int a = 32U; a < 42U; a++, b++)
|
|
m_data[b] = data[a];
|
|
for (unsigned int a = 48U; a < 58U; a++, b++)
|
|
m_data[b] = data[a];
|
|
for (unsigned int a = 64U; a < 74U; a++, b++)
|
|
m_data[b] = data[a];
|
|
for (unsigned int a = 80U; a < 90U; a++, b++)
|
|
m_data[b] = data[a];
|
|
for (unsigned int a = 96U; a < 106U; a++, b++)
|
|
m_data[b] = data[a];
|
|
|
|
// Extract the 5 bit CRC
|
|
unsigned int crc = 0U;
|
|
if (data[42]) crc += 16U;
|
|
if (data[58]) crc += 8U;
|
|
if (data[74]) crc += 4U;
|
|
if (data[90]) crc += 2U;
|
|
if (data[106]) crc += 1U;
|
|
|
|
// Now CRC check this
|
|
if (!CCRC::checkFiveBit(m_data, crc))
|
|
return;
|
|
|
|
m_valid = true;
|
|
|
|
// Extract the FLCO
|
|
unsigned char flco;
|
|
CUtils::bitsToByteBE(m_data + 0U, flco);
|
|
m_FLCO = FLCO(flco & 0x3FU);
|
|
}
|
|
|
|
CDMRLC* CDMREmbeddedData::getLC() const
|
|
{
|
|
if (!m_valid)
|
|
return NULL;
|
|
|
|
if (m_FLCO != FLCO_GROUP && m_FLCO != FLCO_USER_USER)
|
|
return NULL;
|
|
|
|
return new CDMRLC(m_data);
|
|
}
|
|
|
|
bool CDMREmbeddedData::isValid() const
|
|
{
|
|
return m_valid;
|
|
}
|
|
|
|
FLCO CDMREmbeddedData::getFLCO() const
|
|
{
|
|
return m_FLCO;
|
|
}
|
|
|
|
void CDMREmbeddedData::reset()
|
|
{
|
|
m_state = LCS_NONE;
|
|
m_valid = false;
|
|
}
|
|
|
|
bool CDMREmbeddedData::getRawData(unsigned char* data) const
|
|
{
|
|
assert(data != NULL);
|
|
|
|
if (!m_valid)
|
|
return false;
|
|
|
|
CUtils::bitsToByteBE(m_data + 0U, data[0U]);
|
|
CUtils::bitsToByteBE(m_data + 8U, data[1U]);
|
|
CUtils::bitsToByteBE(m_data + 16U, data[2U]);
|
|
CUtils::bitsToByteBE(m_data + 24U, data[3U]);
|
|
CUtils::bitsToByteBE(m_data + 32U, data[4U]);
|
|
CUtils::bitsToByteBE(m_data + 40U, data[5U]);
|
|
CUtils::bitsToByteBE(m_data + 48U, data[6U]);
|
|
CUtils::bitsToByteBE(m_data + 56U, data[7U]);
|
|
CUtils::bitsToByteBE(m_data + 64U, data[8U]);
|
|
|
|
return true;
|
|
}
|