Decode and encode the System Fusion FICH.
This commit is contained in:
Jonathan Naylor
parent
6792894c00
commit
dc819b8821
20
CRC.cpp
20
CRC.cpp
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@ -238,23 +238,3 @@ unsigned char CCRC::crc8(const unsigned char *in, unsigned int length)
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return crc;
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}
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bool CCRC::crcFICH(const unsigned char* fich)
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{
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assert(fich != NULL);
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union {
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uint16_t crc16;
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uint8_t crc8[2U];
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};
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crc16 = 0U;
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crc16 = (uint16_t(crc8[0U]) << 8) ^ CCITT16_TABLE2[crc8[1U] ^ fich[0U]];
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crc16 = (uint16_t(crc8[0U]) << 8) ^ CCITT16_TABLE2[crc8[1U] ^ fich[1U]];
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crc16 = (uint16_t(crc8[0U]) << 8) ^ CCITT16_TABLE2[crc8[1U] ^ fich[2U]];
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crc16 = (uint16_t(crc8[0U]) << 8) ^ CCITT16_TABLE2[crc8[1U] ^ fich[3U]];
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crc16 = ~crc16;
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return crc8[0U] == fich[5U] && crc8[1U] == fich[4U];
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}
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2
CRC.h
2
CRC.h
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@ -32,8 +32,6 @@ public:
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static bool checkCCITT162(const unsigned char* in, unsigned int length);
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static unsigned char crc8(const unsigned char* in, unsigned int length);
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static bool crcFICH(const unsigned char* fich);
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};
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#endif
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@ -12,6 +12,7 @@
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*/
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#include "YSFControl.h"
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#include "YSFFICH.h"
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#include "Utils.h"
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#include "Sync.h"
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#include "Log.h"
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@ -24,7 +25,6 @@
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/*
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* TODO:
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* AMBE FEC reconstruction.
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* FICH regeneration.
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* Callsign extraction + late entry.
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* Uplink and downlink callsign addition.
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*/
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@ -56,6 +56,10 @@ bool CYSFControl::writeModem(unsigned char *data)
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if (type == TAG_LOST && m_state == RS_RELAYING_RF_AUDIO) {
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LogMessage("YSF, transmission lost, %.1f seconds", float(m_frames) / 10.0F);
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if (m_parrot != NULL)
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m_parrot->end();
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writeEndOfTransmission();
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return false;
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}
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@ -84,15 +88,24 @@ bool CYSFControl::writeModem(unsigned char *data)
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if (type == TAG_EOT) {
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CSync::addYSFSync(data + 2U);
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CYSFFICH fich;
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fich.decode(data + 2U);
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m_frames++;
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if (m_duplex) {
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fich.setMR(YSF_MR_BUSY);
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fich.encode(data + 2U);
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data[0U] = TAG_EOT;
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data[1U] = 0x00U;
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writeQueue(data);
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}
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if (m_parrot != NULL) {
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fich.setMR(YSF_MR_NOT_BUSY);
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fich.encode(data + 2U);
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data[0U] = TAG_EOT;
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data[1U] = 0x00U;
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writeParrot(data);
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@ -109,15 +122,24 @@ bool CYSFControl::writeModem(unsigned char *data)
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} else {
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CSync::addYSFSync(data + 2U);
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CYSFFICH fich;
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fich.decode(data + 2U);
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m_frames++;
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if (m_duplex) {
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fich.setMR(YSF_MR_BUSY);
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fich.encode(data + 2U);
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data[0U] = TAG_DATA;
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data[1U] = 0x00U;
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writeQueue(data);
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}
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if (m_parrot != NULL) {
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fich.setMR(YSF_MR_NOT_BUSY);
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fich.encode(data + 2U);
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data[0U] = TAG_DATA;
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data[1U] = 0x00U;
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writeParrot(data);
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@ -196,6 +218,9 @@ void CYSFControl::writeParrot(const unsigned char *data)
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return;
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m_parrot->write(data);
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if (data[0U] == TAG_EOT)
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m_parrot->end();
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}
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bool CYSFControl::openFile()
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@ -29,8 +29,8 @@ const unsigned char BIT_MASK_TABLE[] = {0x80U, 0x40U, 0x20U, 0x10U, 0x08U, 0x04U
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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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#define READ_BIT1(p,i) (p[(i)>>3] & BIT_MASK_TABLE[(i)&7])
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const unsigned char BRANCH_TABLE1[] = {0U, 0U, 0U, 0U, 1U, 1U, 1U, 1U};
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const unsigned char BRANCH_TABLE2[] = {0U, 1U, 1U, 0U, 0U, 1U, 1U, 0U};
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const uint8_t BRANCH_TABLE1[] = {0U, 0U, 0U, 0U, 1U, 1U, 1U, 1U};
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const uint8_t BRANCH_TABLE2[] = {0U, 1U, 1U, 0U, 0U, 1U, 1U, 0U};
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CYSFConvolution::CYSFConvolution() :
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m_metrics1(NULL),
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@ -40,9 +40,9 @@ m_newMetrics(NULL),
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m_decisions(NULL),
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m_dp(NULL)
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{
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m_metrics1 = new unsigned short[16U];
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m_metrics2 = new unsigned short[16U];
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m_decisions = new unsigned long long[100U];
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m_metrics1 = new uint16_t[16U];
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m_metrics2 = new uint16_t[16U];
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m_decisions = new uint64_t[100U];
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}
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CYSFConvolution::~CYSFConvolution()
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@ -54,44 +54,44 @@ CYSFConvolution::~CYSFConvolution()
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const unsigned int NUM_OF_STATES_D2 = 8U;
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const unsigned int NUM_OF_STATES = 16U;
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const unsigned int M = 3U;
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const uint32_t M = 3U;
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const unsigned int K = 5U;
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void CYSFConvolution::start()
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{
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::memset(m_metrics1, 0x00U, NUM_OF_STATES * sizeof(unsigned short));
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::memset(m_metrics2, 0x00U, NUM_OF_STATES * sizeof(unsigned short));
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::memset(m_metrics1, 0x00U, NUM_OF_STATES * sizeof(uint16_t));
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::memset(m_metrics2, 0x00U, NUM_OF_STATES * sizeof(uint16_t));
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m_oldMetrics = m_metrics1;
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m_newMetrics = m_metrics2;
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m_dp = m_decisions;
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}
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void CYSFConvolution::decode(unsigned char s0, unsigned char s1)
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void CYSFConvolution::decode(uint8_t s0, uint8_t s1)
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{
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*m_dp = 0U;
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for (unsigned int i = 0U; i < NUM_OF_STATES_D2; i++) {
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unsigned int j = i * 2U;
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for (uint8_t i = 0U; i < NUM_OF_STATES_D2; i++) {
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uint8_t j = i * 2U;
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unsigned short metric = (BRANCH_TABLE1[i] ^ s0) + (BRANCH_TABLE2[i] ^ s1);
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uint16_t metric = (BRANCH_TABLE1[i] ^ s0) + (BRANCH_TABLE2[i] ^ s1);
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unsigned short m0 = m_oldMetrics[i] + metric;
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unsigned short m1 = m_oldMetrics[i + NUM_OF_STATES_D2] + (M - metric);
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unsigned char decision0 = (m0 >= m1) ? 1U : 0U;
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uint16_t m0 = m_oldMetrics[i] + metric;
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uint16_t m1 = m_oldMetrics[i + NUM_OF_STATES_D2] + (M - metric);
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uint8_t decision0 = (m0 >= m1) ? 1U : 0U;
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m_newMetrics[j + 0U] = decision0 != 0U ? m1 : m0;
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m0 = m_oldMetrics[i] + (M - metric);
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m1 = m_oldMetrics[i + NUM_OF_STATES_D2] + metric;
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unsigned char decision1 = (m0 >= m1) ? 1U : 0U;
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uint8_t decision1 = (m0 >= m1) ? 1U : 0U;
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m_newMetrics[j + 1U] = decision1 != 0U ? m1 : m0;
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*m_dp |= ((unsigned long long)(decision1) << (j + 1U)) | ((unsigned long long)(decision0) << (j + 0U));
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*m_dp |= (uint64_t(decision1) << (j + 1U)) | (uint64_t(decision0) << (j + 0U));
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}
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++m_dp;
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unsigned short* tmp = m_oldMetrics;
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uint16_t* tmp = m_oldMetrics;
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m_oldMetrics = m_newMetrics;
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m_newMetrics = tmp;
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}
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@ -100,16 +100,43 @@ void CYSFConvolution::chainback(unsigned char* out)
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{
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assert(out != NULL);
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unsigned int state = 0U;
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uint32_t state = 0U;
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unsigned char nbits = 96U;
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uint8_t nbits = 96U;
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while (nbits-- > 0) {
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--m_dp;
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unsigned int i = state >> (9 - K);
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unsigned char bit = (unsigned char)(*m_dp >> i) & 1;
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uint32_t i = state >> (9 - K);
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uint8_t bit = uint8_t(*m_dp >> i) & 1;
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state = (bit << 7) | (state >> 1);
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WRITE_BIT1(out, nbits, bit != 0U);
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}
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}
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void CYSFConvolution::encode(const unsigned char* in, unsigned char* out, unsigned int nBits) const
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{
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assert(in != NULL);
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assert(out != NULL);
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assert(nBits > 0U);
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uint8_t d1 = 0U, d2 = 0U, d3 = 0U, d4 = 0U;
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uint32_t k = 0U;
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for (unsigned int i = 0U; i < nBits; i++) {
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uint8_t d = READ_BIT1(in, i) ? 1U : 0U;
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uint8_t g1 = (d + d3 + d4) & 1;
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uint8_t g2 = (d + d1 + d2 + d4) & 1;
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d4 = d3;
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d3 = d2;
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d2 = d1;
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d1 = d;
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WRITE_BIT1(out, k, g1 != 0U);
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k++;
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WRITE_BIT1(out, k, g2 != 0U);
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k++;
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}
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}
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@ -21,22 +21,26 @@
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#include "YSFConvolution.h"
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#include <cstdint>
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class CYSFConvolution {
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public:
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CYSFConvolution();
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~CYSFConvolution();
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void start();
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void decode(unsigned char s0, unsigned char s1);
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void decode(uint8_t s0, uint8_t s1);
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void chainback(unsigned char* out);
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void encode(const unsigned char* in, unsigned char* out, unsigned int nBits) const;
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private:
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unsigned short* m_metrics1;
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unsigned short* m_metrics2;
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unsigned short* m_oldMetrics;
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unsigned short* m_newMetrics;
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unsigned long long* m_decisions;
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unsigned long long* m_dp;
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uint16_t* m_metrics1;
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uint16_t* m_metrics2;
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uint16_t* m_oldMetrics;
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uint16_t* m_newMetrics;
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uint64_t* m_decisions;
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uint64_t* m_dp;
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};
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#endif
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@ -32,4 +32,10 @@ const unsigned char YSF_DT_TERMINATOR_CHANNEL = 0x80U;
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const unsigned char YSF_CKSUM_OK = 0x01U;
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const unsigned char YSF_CM_GROUP = 0x00U;
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const unsigned char YSF_CM_INDIVIDUAL = 0x0CU;
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const unsigned char YSF_MR_NOT_BUSY = 0x08U;
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const unsigned char YSF_MR_BUSY = 0x10U;
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#endif
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123
YSFFICH.cpp
123
YSFFICH.cpp
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@ -17,9 +17,11 @@
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*/
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#include "YSFConvolution.h"
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#include "YSFDefines.h"
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#include "Golay24128.h"
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#include "YSFFICH.h"
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#include "CRC.h"
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#include "Log.h"
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#include <cstdio>
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#include <cassert>
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@ -30,7 +32,7 @@ const unsigned char BIT_MASK_TABLE[] = {0x80U, 0x40U, 0x20U, 0x10U, 0x08U, 0x04U
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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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#define READ_BIT1(p,i) (p[(i)>>3] & BIT_MASK_TABLE[(i)&7])
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const unsigned int INTERLEAVE_TABLE_RX[] = {
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const unsigned int INTERLEAVE_TABLE[] = {
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0U, 40U, 80U, 120U, 160U,
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2U, 42U, 82U, 122U, 162U,
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4U, 44U, 84U, 124U, 164U,
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@ -52,32 +54,37 @@ const unsigned int INTERLEAVE_TABLE_RX[] = {
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36U, 76U, 116U, 156U, 196U,
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38U, 78U, 118U, 158U, 198U};
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CYSFFICH::CYSFFICH()
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CYSFFICH::CYSFFICH() :
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m_fich(NULL)
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{
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m_fich = new unsigned char[6U];
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}
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CYSFFICH::~CYSFFICH()
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{
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delete[] m_fich;
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}
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bool CYSFFICH::decode(const unsigned char* data, unsigned char* fich) const
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bool CYSFFICH::decode(const unsigned char* bytes)
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{
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assert(data != NULL);
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assert(fich != NULL);
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assert(bytes != NULL);
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// Skip the sync bytes
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bytes += YSF_SYNC_LENGTH_BYTES;
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CYSFConvolution viterbi;
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viterbi.start();
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// Deinterleave the FICH and send bits to the Viterbi decoder
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for (unsigned int i = 0U; i < 100U; i++) {
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unsigned int n = INTERLEAVE_TABLE_RX[i];
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unsigned int s0 = READ_BIT1(data, n) ? 1U : 0U;
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unsigned int n = INTERLEAVE_TABLE[i];
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uint8_t s0 = READ_BIT1(bytes, n) ? 1U : 0U;
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n++;
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unsigned int s1 = READ_BIT1(data, n) ? 1U : 0U;
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uint8_t s1 = READ_BIT1(bytes, n) ? 1U : 0U;
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viterbi.decode(s0, s1);
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}
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}
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unsigned char output[13U];
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viterbi.chainback(output);
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@ -87,12 +94,96 @@ bool CYSFFICH::decode(const unsigned char* data, unsigned char* fich) const
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unsigned int b2 = CGolay24128::decode24128(output + 6U);
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unsigned int b3 = CGolay24128::decode24128(output + 9U);
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fich[0U] = (b0 >> 16) & 0xFFU;
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fich[1U] = ((b0 >> 8) & 0xF0U) | ((b1 >> 20) & 0x0FU);
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fich[2U] = (b1 >> 12) & 0xFFU;
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fich[3U] = (b2 >> 16) & 0xFFU;
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fich[4U] = ((b2 >> 8) & 0xF0U) | ((b3 >> 20) & 0x0FU);
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fich[5U] = (b3 >> 12) & 0xFFU;
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m_fich[0U] = (b0 >> 4) & 0xFFU;
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m_fich[1U] = ((b0 << 4) & 0xF0U) | ((b1 >> 8) & 0x0FU);
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m_fich[2U] = (b1 >> 0) & 0xFFU;
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m_fich[3U] = (b2 >> 4) & 0xFFU;
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m_fich[4U] = ((b2 << 4) & 0xF0U) | ((b3 >> 8) & 0x0FU);
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m_fich[5U] = (b3 >> 0) & 0xFFU;
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return CCRC::crcFICH(fich);
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return CCRC::checkCCITT162(m_fich, 6U);
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}
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void CYSFFICH::encode(unsigned char* bytes)
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{
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assert(bytes != NULL);
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// Skip the sync bytes
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bytes += YSF_SYNC_LENGTH_BYTES;
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CCRC::addCCITT162(m_fich, 6U);
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unsigned int b0 = ((m_fich[0U] << 4) & 0xFF0U) | ((m_fich[1U] >> 4) & 0x00FU);
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unsigned int b1 = ((m_fich[1U] << 8) & 0xF00U) | ((m_fich[2U] >> 0) & 0x0FFU);
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unsigned int b2 = ((m_fich[3U] << 4) & 0xFF0U) | ((m_fich[4U] >> 4) & 0x00FU);
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unsigned int b3 = ((m_fich[4U] << 8) & 0xF00U) | ((m_fich[5U] >> 0) & 0x0FFU);
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unsigned int c0 = CGolay24128::encode24128(b0);
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unsigned int c1 = CGolay24128::encode24128(b1);
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unsigned int c2 = CGolay24128::encode24128(b2);
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unsigned int c3 = CGolay24128::encode24128(b3);
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unsigned char conv[13U];
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conv[0U] = (c0 >> 16) & 0xFFU;
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conv[1U] = (c0 >> 8) & 0xFFU;
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conv[2U] = (c0 >> 0) & 0xFFU;
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conv[3U] = (c1 >> 16) & 0xFFU;
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conv[4U] = (c1 >> 8) & 0xFFU;
|
||||
conv[5U] = (c1 >> 0) & 0xFFU;
|
||||
conv[6U] = (c2 >> 16) & 0xFFU;
|
||||
conv[7U] = (c2 >> 8) & 0xFFU;
|
||||
conv[8U] = (c2 >> 0) & 0xFFU;
|
||||
conv[9U] = (c3 >> 16) & 0xFFU;
|
||||
conv[10U] = (c3 >> 8) & 0xFFU;
|
||||
conv[11U] = (c3 >> 0) & 0xFFU;
|
||||
conv[12U] = 0x00U;
|
||||
|
||||
CYSFConvolution convolution;
|
||||
unsigned char convolved[25U];
|
||||
convolution.encode(conv, convolved, 100U);
|
||||
|
||||
unsigned int j = 0U;
|
||||
for (unsigned int i = 0U; i < 100U; i++) {
|
||||
unsigned int n = INTERLEAVE_TABLE[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);
|
||||
}
|
||||
}
|
||||
|
||||
unsigned char CYSFFICH::getCM() const
|
||||
{
|
||||
return m_fich[0U] & 0x0CU;
|
||||
}
|
||||
|
||||
unsigned char CYSFFICH::getFT() const
|
||||
{
|
||||
return m_fich[1U] & 0x07U;
|
||||
}
|
||||
|
||||
unsigned char CYSFFICH::getFN() const
|
||||
{
|
||||
return (m_fich[1U] & 0x38U) >> 3;
|
||||
}
|
||||
|
||||
void CYSFFICH::setMR(unsigned char mr)
|
||||
{
|
||||
m_fich[2U] &= 0xC7U;
|
||||
m_fich[2U] |= mr;
|
||||
}
|
||||
|
||||
void CYSFFICH::setVoIP(bool on)
|
||||
{
|
||||
if (on)
|
||||
m_fich[2U] |= 0x04U;
|
||||
else
|
||||
m_fich[2U] &= 0xFBU;
|
||||
}
|
||||
|
|
|
|||
12
YSFFICH.h
12
YSFFICH.h
|
|
@ -24,9 +24,19 @@ public:
|
|||
CYSFFICH();
|
||||
~CYSFFICH();
|
||||
|
||||
bool decode(const unsigned char* frame, unsigned char* fich) const;
|
||||
bool decode(const unsigned char* bytes);
|
||||
|
||||
void encode(unsigned char* bytes);
|
||||
|
||||
unsigned char getCM() const;
|
||||
unsigned char getFT() const;
|
||||
unsigned char getFN() const;
|
||||
|
||||
void setMR(unsigned char mr);
|
||||
void setVoIP(bool set);
|
||||
|
||||
private:
|
||||
unsigned char* m_fich;
|
||||
};
|
||||
|
||||
#endif
|
||||
|
|
|
|||
|
|
@ -51,14 +51,16 @@ bool CYSFParrot::write(const unsigned char* data)
|
|||
::memcpy(m_data + m_used, data, YSF_FRAME_LENGTH_BYTES + 2U);
|
||||
m_used += YSF_FRAME_LENGTH_BYTES + 2U;
|
||||
|
||||
if (data[0U] == TAG_EOT) {
|
||||
m_timer.start();
|
||||
m_ptr = 0U;
|
||||
}
|
||||
|
||||
return true;
|
||||
}
|
||||
|
||||
void CYSFParrot::end()
|
||||
{
|
||||
m_timer.start();
|
||||
|
||||
m_ptr = 0U;
|
||||
}
|
||||
|
||||
void CYSFParrot::read(unsigned char* data)
|
||||
{
|
||||
assert(data != NULL);
|
||||
|
|
|
|||
|
|
@ -31,6 +31,8 @@ public:
|
|||
|
||||
void read(unsigned char* data);
|
||||
|
||||
void end();
|
||||
|
||||
bool hasData();
|
||||
|
||||
void clock(unsigned int ms);
|
||||
|
|
|
|||
Loading…
Reference in New Issue