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Work on V/D Mode 2.

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This commit is contained in:
Jonathan Naylor
2016-02-29 19:52:11 +00:00
parent 0c1e6d3542
commit 5448a5d8d9
4 changed files with 187 additions and 31 deletions
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179
YSFPayload.cpp
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@@ -66,13 +66,20 @@ const unsigned int INTERLEAVE_TABLE_5_20[] = {
36U, 76U, 116U, 156U, 196U,
38U, 78U, 118U, 158U, 198U};
const unsigned char WHITENING_DATA[] = {0x93U, 0xD7U, 0x51U, 0x21U, 0x9CU, 0x2FU, 0x6CU, 0xD0U, 0xEFU, 0x0FU,
0xF8U, 0x3DU, 0xF1U, 0x73U, 0x20U, 0x94U, 0xEDU, 0x1EU, 0x7CU, 0xD8U};
const unsigned char BIT_MASK_TABLE[] = {0x80U, 0x40U, 0x20U, 0x10U, 0x08U, 0x04U, 0x02U, 0x01U};
#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])
#define READ_BIT1(p,i) (p[(i)>>3] & BIT_MASK_TABLE[(i)&7])
CYSFPayload::CYSFPayload() :
m_data(NULL)
m_data(NULL),
m_uplink(NULL),
m_downlink(NULL),
m_source(NULL),
m_dest(NULL)
{
m_data = new unsigned char[90U];
}
@@ -80,6 +87,8 @@ m_data(NULL)
CYSFPayload::~CYSFPayload()
{
delete[] m_data;
delete[] m_uplink;
delete[] m_downlink;
}
bool CYSFPayload::decode(const unsigned char* bytes, unsigned char fi, unsigned char fn, unsigned char ft, unsigned char dt)
@@ -148,8 +157,12 @@ bool CYSFPayload::decodeHeader()
conv.chainback(output1, 176U);
bool ret1 = CCRC::checkCCITT162(output1, 22U);
if (ret1)
CUtils::dump("Header/Trailer, valid DCH1", output1, 22U);
if (ret1) {
for (unsigned int i = 0U; i < 20U; i++)
output1[i] ^= WHITENING_DATA[i];
CUtils::dump("Header/Trailer, valid DCH1", output1, 20U);
}
conv.start();
@@ -169,8 +182,12 @@ bool CYSFPayload::decodeHeader()
bool ret2 = CCRC::checkCCITT162(output2, 22U);
if (ret2)
CUtils::dump("Header/Trailer, valid DCH2", output2, 22U);
if (ret2) {
for (unsigned int i = 0U; i < 20U; i++)
output2[i] ^= WHITENING_DATA[i];
CUtils::dump("Header/Trailer, valid DCH2", output2, 20U);
}
return true;
}
@@ -204,8 +221,12 @@ bool CYSFPayload::decodeVDMode1(unsigned char fn, unsigned char ft)
conv.chainback(output, 176U);
bool ret = CCRC::checkCCITT162(output, 22U);
if (ret)
CUtils::dump("V/D Mode 1, valid DCH", output, 22U);
if (ret) {
for (unsigned int i = 0U; i < 20U; i++)
output[i] ^= WHITENING_DATA[i];
CUtils::dump("V/D Mode 1, valid DCH", output, 20U);
}
return true;
}
@@ -239,8 +260,79 @@ bool CYSFPayload::decodeVDMode2(unsigned char fn, unsigned char ft)
conv.chainback(output, 96U);
bool ret = CCRC::checkCCITT162(output, 12U);
if (ret)
CUtils::dump("V/D Mode 2, valid DCH", output, 12U);
if (ret) {
for (unsigned int i = 0U; i < 10U; i++)
output[i] ^= WHITENING_DATA[i];
switch (fn) {
case 0U:
CUtils::dump("V/D Mode 2, Destination", output, 10U);
if (m_dest == NULL)
m_dest = new unsigned char[10U];
::memcpy(m_dest, output, 10U);
break;
case 1U:
CUtils::dump("V/D Mode 2, Source", output, 10U);
if (m_source == NULL)
m_source = new unsigned char[10U];
::memcpy(m_source, output, 10U);
break;
case 4U:
CUtils::dump("V/D Mode 2, Rem 1+2", output, 10U);
break;
case 5U:
CUtils::dump("V/D Mode 2, Rem 3+4", output, 10U);
break;
default:
break;
}
}
if (fn == 2U && m_downlink != NULL) {
for (unsigned int i = 0U; i < 10U; i++)
output[i] = WHITENING_DATA[i] ^ m_downlink[i];
ret = true;
}
if (fn == 3U && m_uplink != NULL) {
for (unsigned int i = 0U; i < 10U; i++)
output[i] = WHITENING_DATA[i] ^ m_uplink[i];
ret = true;
}
// Data is corrupt so don't try and regenerate it
if (!ret)
return false;
CCRC::addCCITT162(output, 12U);
output[12U] = 0x00U;
unsigned char convolved[25U];
conv.encode(output, convolved, 100U);
unsigned char bytes[25U];
unsigned int j = 0U;
for (unsigned int i = 0U; i < 100U; i++) {
unsigned int n = INTERLEAVE_TABLE_5_20[i];
bool s0 = READ_BIT1(convolved, j) != 0U;
j++;
bool s1 = READ_BIT1(convolved, j) != 0U;
j++;
WRITE_BIT1(bytes, n, s0);
n++;
WRITE_BIT1(bytes, n, s1);
}
p1 = m_data;
p2 = bytes;
for (unsigned int i = 0U; i < 5U; i++) {
::memcpy(p1, p2, 5U);
p1 += 18U; p2 += 5U;
}
return true;
}
@@ -278,8 +370,12 @@ bool CYSFPayload::decodeDataFRMode(unsigned char fn, unsigned char ft)
conv.chainback(output1, 176U);
bool ret1 = CCRC::checkCCITT162(output1, 22U);
if (ret1)
CUtils::dump("Data FR Mode, valid DCH1", output1, 22U);
if (ret1) {
for (unsigned int i = 0U; i < 20U; i++)
output1[i] ^= WHITENING_DATA[i];
CUtils::dump("Data FR Mode, valid DCH1", output1, 20U);
}
conv.start();
@@ -297,10 +393,65 @@ bool CYSFPayload::decodeDataFRMode(unsigned char fn, unsigned char ft)
unsigned char output2[23U];
conv.chainback(output2, 176U);
bool ret2 = CCRC::checkCCITT162(output2, 22U);
if (ret2)
CUtils::dump("Data FR Mode, valid DCH2", output2, 22U);
if (ret2) {
for (unsigned int i = 0U; i < 20U; i++)
output2[i] ^= WHITENING_DATA[i];
CUtils::dump("Data FR Mode, valid DCH2", output2, 20U);
}
return true;
}
void CYSFPayload::setUplink(const std::string& callsign)
{
m_uplink = new unsigned char[10U];
std::string uplink = callsign;
uplink.resize(10U, ' ');
for (unsigned int i = 0U; i < 10U; i++)
m_uplink[i] = uplink.at(i);
}
void CYSFPayload::setDownlink(const std::string& callsign)
{
m_downlink = new unsigned char[10U];
std::string downlink = callsign;
downlink.resize(10U, ' ');
for (unsigned int i = 0U; i < 10U; i++)
m_downlink[i] = downlink.at(i);
}
bool CYSFPayload::getSource(unsigned char* callsign)
{
assert(callsign != NULL);
if (m_source == NULL)
return false;
::memcpy(callsign, m_source, 10U);
delete[] m_source;
m_source = NULL;
return true;
}
bool CYSFPayload::getDest(unsigned char* callsign)
{
assert(callsign != NULL);
if (m_dest == NULL)
return false;
::memcpy(callsign, m_dest, 10U);
delete[] m_dest;
m_dest = NULL;
return true;
}