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kicad/eeschema/sim/kibis/kibis.cpp

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/*
* This program source code file is part of KiCad, a free EDA CAD application.
*
* Copyright (C) 2022 Fabien Corona f.corona<at>laposte.net
*
* Redistribution and use in source and binary forms, with or without modification,
* are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
*
* 3. Neither the name of the copyright holder nor the names of its contributors may be used
* to endorse or promote products derived from this software without specific
* prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS
* OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
* AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
* OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
#include "kibis.h"
#include "ibis_parser.h"
#include <sstream>
#include <sim/spice_simulator.h>
// _() is used here to mark translatable strings in IBIS_REPORTER::Report()
// However, currently non ASCII7 chars are nor correctly handled when printing messages
// So we disable translations
#if 0
#include <wx/intl.h> // for _() macro and wxGetTranslation()
#else
#undef _
#define _( x ) x
#endif
KIBIS_ANY::KIBIS_ANY( KIBIS* aTopLevel ) : IBIS_ANY( aTopLevel->m_reporter )
{
m_topLevel = aTopLevel;
m_valid = false;
}
IBIS_CORNER ReverseLogic( IBIS_CORNER aIn )
{
IBIS_CORNER out = IBIS_CORNER::TYP;
if( aIn == IBIS_CORNER::MIN )
{
out = IBIS_CORNER::MAX;
}
else if( aIn == IBIS_CORNER::MAX )
{
out = IBIS_CORNER::MIN;
}
return out;
}
KIBIS::KIBIS( std::string aFileName ) : KIBIS_ANY( this ), m_file( this )
{
IBIS_REPORTER reporter;
IbisParser parser( &reporter );
bool status = true;
parser.m_parrot = false;
status &= parser.ParseFile( aFileName );
status &= m_file.Init( parser );
for( IbisModel& iModel : parser.m_ibisFile.m_models )
{
KIBIS_MODEL kModel( this, iModel, parser );
status &= kModel.m_valid;
m_models.push_back( kModel );
}
for( IbisComponent& iComponent : parser.m_ibisFile.m_components )
{
KIBIS_COMPONENT kComponent( this, iComponent, parser );
status &= kComponent.m_valid;
m_components.push_back( kComponent );
for( KIBIS_PIN& pin : m_components.back().m_pins )
{
pin.m_parent = &( m_components.back() );
}
for( IbisDiffPinEntry dpEntry : iComponent.m_diffPin.m_entries )
{
KIBIS_PIN* pinA = m_components.back().GetPin( dpEntry.pinA );
KIBIS_PIN* pinB = m_components.back().GetPin( dpEntry.pinB );
if( pinA && pinB )
{
pinA->m_complementaryPin = pinB;
pinB->m_complementaryPin = pinA;
}
}
}
m_valid = status;
}
KIBIS_FILE::KIBIS_FILE( KIBIS* aTopLevel ) : KIBIS_ANY( aTopLevel )
{
m_fileRev = -1;
m_ibisVersion = -1;
}
bool KIBIS_FILE::Init( IbisParser& aParser )
{
bool status = true;
m_fileName = aParser.m_ibisFile.m_header.m_fileName;
m_fileRev = aParser.m_ibisFile.m_header.m_fileRevision;
m_ibisVersion = aParser.m_ibisFile.m_header.m_ibisVersion;
m_date = aParser.m_ibisFile.m_header.m_date;
m_notes = aParser.m_ibisFile.m_header.m_notes;
m_disclaimer = aParser.m_ibisFile.m_header.m_disclaimer;
m_copyright = aParser.m_ibisFile.m_header.m_copyright;
m_valid = status;
return status;
}
KIBIS_PIN::KIBIS_PIN( KIBIS* aTopLevel, IbisComponentPin& aPin, IbisComponentPackage& aPackage,
IbisParser& aParser, KIBIS_COMPONENT* aParent,
std::vector<KIBIS_MODEL>& aModels ) :
KIBIS_ANY( aTopLevel ),
m_Rpin( aTopLevel->m_reporter ), m_Lpin( aTopLevel->m_reporter ),
m_Cpin( aTopLevel->m_reporter )
{
m_signalName = aPin.m_signalName;
m_pinNumber = aPin.m_pinName;
m_parent = aParent;
m_Rpin = aPackage.m_Rpkg;
m_Lpin = aPackage.m_Lpkg;
m_Cpin = aPackage.m_Cpkg;
// The values listed in the [Pin] description section override the default
// values defined in [Package]
// @TODO : Reading the IBIS standard, I can't figure out if we are supposed
// to replace typ, min, and max, or just the typ ?
if( !isnan( aPin.m_Rpin ) )
{
m_Rpin.value[IBIS_CORNER::TYP] = aPin.m_Rpin;
m_Rpin.value[IBIS_CORNER::MIN] = aPin.m_Rpin;
m_Rpin.value[IBIS_CORNER::MAX] = aPin.m_Rpin;
}
if( !isnan( aPin.m_Lpin ) )
{
m_Lpin.value[IBIS_CORNER::TYP] = aPin.m_Lpin;
m_Lpin.value[IBIS_CORNER::MIN] = aPin.m_Lpin;
m_Lpin.value[IBIS_CORNER::MAX] = aPin.m_Lpin;
}
if( !isnan( aPin.m_Cpin ) )
{
m_Cpin.value[IBIS_CORNER::TYP] = aPin.m_Cpin;
m_Cpin.value[IBIS_CORNER::MIN] = aPin.m_Cpin;
m_Cpin.value[IBIS_CORNER::MAX] = aPin.m_Cpin;
}
bool modelSelected = false;
std::vector<std::string> listOfModels;
for( IbisModelSelector modelSelector : aParser.m_ibisFile.m_modelSelectors )
{
if( !strcmp( modelSelector.m_name.c_str(), aPin.m_modelName.c_str() ) )
{
for( IbisModelSelectorEntry model : modelSelector.m_models )
{
listOfModels.push_back( model.m_modelName );
}
modelSelected = true;
break;
}
}
if( !modelSelected )
{
listOfModels.push_back( aPin.m_modelName );
}
for( std::string modelName : listOfModels )
{
for( KIBIS_MODEL& model : aModels )
{
if( !strcmp( model.m_name.c_str(), modelName.c_str() ) )
{
m_models.push_back( &model );
}
}
}
m_valid = true;
}
KIBIS_MODEL::KIBIS_MODEL( KIBIS* aTopLevel, IbisModel& aSource, IbisParser& aParser ) :
KIBIS_ANY( aTopLevel ), m_C_comp( aTopLevel->m_reporter ),
m_voltageRange( aTopLevel->m_reporter ), m_temperatureRange( aTopLevel->m_reporter ),
m_pullupReference( aTopLevel->m_reporter ), m_pulldownReference( aTopLevel->m_reporter ),
m_GNDClampReference( aTopLevel->m_reporter ),
m_POWERClampReference( aTopLevel->m_reporter ), m_Rgnd( aTopLevel->m_reporter ),
m_Rpower( aTopLevel->m_reporter ), m_Rac( aTopLevel->m_reporter ),
m_Cac( aTopLevel->m_reporter ), m_GNDClamp( aTopLevel->m_reporter ),
m_POWERClamp( aTopLevel->m_reporter ), m_pullup( aTopLevel->m_reporter ),
m_pulldown( aTopLevel->m_reporter ), m_ramp( aTopLevel->m_reporter )
{
bool status = true;
m_name = aSource.m_name;
m_type = aSource.m_type;
m_description = std::string( "No description available." );
for( IbisModelSelector modelSelector : aParser.m_ibisFile.m_modelSelectors )
{
for( IbisModelSelectorEntry entry : modelSelector.m_models )
{
if( !strcmp( entry.m_modelName.c_str(), m_name.c_str() ) )
{
m_description = entry.m_modelDescription;
}
}
}
m_vinh = aSource.m_vinh;
m_vinl = aSource.m_vinl;
m_vref = aSource.m_vref;
m_rref = aSource.m_rref;
m_cref = aSource.m_cref;
m_vmeas = aSource.m_vmeas;
m_enable = aSource.m_enable;
m_polarity = aSource.m_polarity;
m_ramp = aSource.m_ramp;
m_risingWaveforms = aSource.m_risingWaveforms;
m_fallingWaveforms = aSource.m_fallingWaveforms;
m_GNDClamp = aSource.m_GNDClamp;
m_GNDClampReference = aSource.m_GNDClampReference;
m_POWERClamp = aSource.m_POWERClamp;
m_POWERClampReference = aSource.m_POWERClampReference;
m_C_comp = aSource.m_C_comp;
m_voltageRange = aSource.m_voltageRange;
m_temperatureRange = aSource.m_temperatureRange;
m_pullupReference = aSource.m_pullupReference;
m_pulldownReference = aSource.m_pulldownReference;
m_Rgnd = aSource.m_Rgnd;
m_Rpower = aSource.m_Rpower;
m_Rac = aSource.m_Rac;
m_Cac = aSource.m_Cac;
m_pullup = aSource.m_pullup;
m_pulldown = aSource.m_pulldown;
m_valid = status;
}
KIBIS_COMPONENT::KIBIS_COMPONENT( KIBIS* aTopLevel, IbisComponent& aSource, IbisParser& aParser ) :
KIBIS_ANY( aTopLevel )
{
bool status = true;
m_name = aSource.m_name;
m_manufacturer = aSource.m_manufacturer;
m_topLevel = aTopLevel;
for( IbisComponentPin& iPin : aSource.m_pins )
{
if( iPin.m_dummy )
{
continue;
}
KIBIS_PIN kPin( aTopLevel, iPin, aSource.m_package, aParser, nullptr,
m_topLevel->m_models );
status &= kPin.m_valid;
m_pins.push_back( kPin );
}
m_valid = status;
}
KIBIS_PIN* KIBIS_COMPONENT::GetPin( std::string aPinNumber )
{
for( KIBIS_PIN& pin : m_pins )
{
if( pin.m_pinNumber == aPinNumber )
{
return &pin;
}
}
return nullptr;
}
std::vector<std::pair<IbisWaveform*, IbisWaveform*>> KIBIS_MODEL::waveformPairs()
{
std::vector<std::pair<IbisWaveform*, IbisWaveform*>> pairs;
IbisWaveform* wf1;
IbisWaveform* wf2;
for( size_t i = 0; i < m_risingWaveforms.size(); i++ )
{
for( size_t j = 0; j < m_fallingWaveforms.size(); j++ )
{
wf1 = m_risingWaveforms.at( i );
wf2 = m_fallingWaveforms.at( j );
if( wf1->m_R_fixture == wf2->m_R_fixture && wf1->m_L_fixture == wf2->m_L_fixture
&& wf1->m_C_fixture == wf2->m_C_fixture && wf1->m_V_fixture == wf2->m_V_fixture
&& wf1->m_V_fixture_min == wf2->m_V_fixture_min
&& wf1->m_V_fixture_max == wf2->m_V_fixture_max )
{
std::pair<IbisWaveform*, IbisWaveform*> p;
p.first = wf1;
p.second = wf2;
pairs.push_back( p );
}
}
}
return pairs;
}
std::string KIBIS_MODEL::SpiceDie( KIBIS_PARAMETER& aParam, int aIndex )
{
std::string result;
std::string GC_GND = "GC_GND";
std::string PC_PWR = "PC_PWR";
std::string PU_PWR = "PU_PWR";
std::string PD_GND = "PD_GND";
std::string DIE = "DIE";
std::string DIEBUFF = "DIEBUFF";
IBIS_CORNER supply = aParam.m_supply;
IBIS_CORNER ccomp = aParam.m_Ccomp;
GC_GND += std::to_string( aIndex );
PC_PWR += std::to_string( aIndex );
PU_PWR += std::to_string( aIndex );
PD_GND += std::to_string( aIndex );
DIE += std::to_string( aIndex );
DIEBUFF += std::to_string( aIndex );
std::string GC = "GC";
std::string PC = "PC";
std::string PU = "PU";
std::string PD = "PD";
GC += std::to_string( aIndex );
PC += std::to_string( aIndex );
PU += std::to_string( aIndex );
PD += std::to_string( aIndex );
result = "\n";
result += "VPWR POWER GND ";
result += doubleToString( m_voltageRange.value[supply] );
result += "\n";
result += "CCPOMP " + DIE + " GND ";
result += doubleToString( m_C_comp.value[ccomp] );
result += "\n";
if( HasGNDClamp() )
{
result += m_GNDClamp.Spice( aIndex * 4 + 1, DIE, GC_GND, GC, supply );
result += "VmeasGC GND " + GC_GND + " 0\n";
}
if( HasPOWERClamp() )
{
result += m_POWERClamp.Spice( aIndex * 4 + 2, "POWER", DIE, PC, supply );
result += "VmeasPC POWER " + PC_PWR + " 0\n";
}
if( HasPulldown() )
{
result += m_pulldown.Spice( aIndex * 4 + 3, DIEBUFF, PD_GND, PD, supply );
result += "VmeasPD GND " + PD_GND + " 0\n";
result += "BKD GND " + DIE + " i=( -i(VmeasPU) * v(KU) )\n";
}
if( HasPullup() )
{
result += m_pullup.Spice( aIndex * 4 + 4, PU_PWR, DIEBUFF, PU, supply );
result += "VmeasPU POWER " + PU_PWR + " 0\n";
result += "BKU POWER " + DIE + " i=( i(VmeasPD) * v(KD) )\n";
}
result += "BDIEBUFF " + DIEBUFF + " GND v=v(" + DIE + ")\n";
return result;
}
IbisWaveform KIBIS_MODEL::TrimWaveform( IbisWaveform& aIn )
{
IbisWaveform out( aIn.m_reporter );
int nbPoints = aIn.m_table.m_entries.size();
if( nbPoints < 2 )
{
Report( _( "waveform has less than two points" ), RPT_SEVERITY_ERROR );
return out;
}
double DCtyp = aIn.m_table.m_entries[0].V.value[IBIS_CORNER::TYP];
double DCmin = aIn.m_table.m_entries[0].V.value[IBIS_CORNER::MIN];
double DCmax = aIn.m_table.m_entries[0].V.value[IBIS_CORNER::MAX];
if( nbPoints == 2 )
{
return out;
}
out.m_table.m_entries.clear();
for( int i = 0; i < nbPoints; i++ )
{
VTtableEntry entry( out.m_reporter );
entry.t = aIn.m_table.m_entries.at( i ).t;
entry.V.value[IBIS_CORNER::TYP] = aIn.m_table.m_entries.at( i ).V.value[IBIS_CORNER::TYP];
entry.V.value[IBIS_CORNER::MIN] = aIn.m_table.m_entries.at( i ).V.value[IBIS_CORNER::MIN];
entry.V.value[IBIS_CORNER::MAX] = aIn.m_table.m_entries.at( i ).V.value[IBIS_CORNER::MAX];
out.m_table.m_entries.push_back( entry );
out.m_table.m_entries.at( i ).V.value[IBIS_CORNER::TYP] -= DCtyp;
out.m_table.m_entries.at( i ).V.value[IBIS_CORNER::MIN] -= DCmin;
out.m_table.m_entries.at( i ).V.value[IBIS_CORNER::MAX] -= DCmax;
}
return out;
}
bool KIBIS_MODEL::HasPulldown()
{
return m_pulldown.m_entries.size() > 0;
}
bool KIBIS_MODEL::HasPullup()
{
return m_pullup.m_entries.size() > 0;
}
bool KIBIS_MODEL::HasGNDClamp()
{
return m_GNDClamp.m_entries.size() > 0;
}
bool KIBIS_MODEL::HasPOWERClamp()
{
return m_POWERClamp.m_entries.size() > 0;
}
std::string KIBIS_MODEL::generateSquareWave( std::string aNode1, std::string aNode2,
std::vector<std::pair<int, double>> aBits,
std::pair<IbisWaveform*, IbisWaveform*> aPair,
KIBIS_PARAMETER& aParam )
{
IBIS_CORNER supply = aParam.m_supply;
std::string simul;
std::vector<int>stimuliIndex;
IbisWaveform risingWF = TrimWaveform( *( aPair.first ) );
IbisWaveform fallingWF = TrimWaveform( *( aPair.second ) );
double deltaR = risingWF.m_table.m_entries.back().V.value[supply]
- risingWF.m_table.m_entries.at( 0 ).V.value[supply];
double deltaF = fallingWF.m_table.m_entries.back().V.value[supply]
- fallingWF.m_table.m_entries.at( 0 ).V.value[supply];
// Ideally, delta should be equal to zero.
// It can be different from zero if the falling waveform does not start were the rising one ended.
double delta = deltaR + deltaF;
int i = 0;
int prevBit = 2;
for( std::pair<int, double> bit : aBits )
{
IbisWaveform* WF;
double timing = bit.second;
if ( bit.first != prevBit )
{
if( bit.first == 1 )
WF = &risingWF;
else
WF = &fallingWF;
stimuliIndex.push_back( i );
simul += "Vstimuli";
simul += std::to_string( i );
simul += " stimuli";
simul += std::to_string( i );
simul += " ";
simul += aNode2;
simul += " pwl ( \n+";
if( i != 0 )
{
simul += "0 0 ";
VTtableEntry entry0 = WF->m_table.m_entries.at( 0 );
VTtableEntry entry1 = WF->m_table.m_entries.at( 1 );
double deltaT = entry1.t - entry0.t;
simul += doubleToString( entry0.t + timing - deltaT );
simul += " ";
simul += "0";
simul += "\n+";
}
for( VTtableEntry& entry : WF->m_table.m_entries )
{
simul += doubleToString( entry.t + timing );
simul += " ";
simul += doubleToString( entry.V.value[supply] - delta );
simul += "\n+";
}
simul += ")\n";
}
i++;
prevBit = bit.first;
}
simul += "bin ";
simul += aNode1;
simul += " ";
simul += aNode2;
simul += " v=(";
for( int ii: stimuliIndex )
{
simul += " v( stimuli";
simul += std::to_string( ii );
simul += " ) +\n+";
}
// Depending on the first bit, we add a different DC value
// The DC value we add is the first value of the first bit.
if( ( aBits.size() > 0 ) && ( aBits[0].first == 0 ) )
{
simul += doubleToString( aPair.second->m_table.m_entries.at( 0 ).V.value[supply] );
}
else
{
simul += doubleToString( aPair.first->m_table.m_entries.at( 0 ).V.value[supply] );
}
simul += ")\n";
return simul;
}
std::string KIBIS_PIN::addDie( KIBIS_MODEL& aModel, KIBIS_PARAMETER& aParam, int aIndex )
{
IBIS_CORNER supply = aParam.m_supply;
std::string simul;
std::string GC_GND = "GC_GND";
std::string PC_PWR = "PC_PWR";
std::string PU_PWR = "PU_PWR";
std::string PD_GND = "PD_GND";
std::string DIE = "DIE";
GC_GND += std::to_string( aIndex );
PC_PWR += std::to_string( aIndex );
PU_PWR += std::to_string( aIndex );
PD_GND += std::to_string( aIndex );
DIE += std::to_string( aIndex );
std::string GC = "GC";
std::string PC = "PC";
std::string PU = "PU";
std::string PD = "PD";
GC += std::to_string( aIndex );
PC += std::to_string( aIndex );
PU += std::to_string( aIndex );
PD += std::to_string( aIndex );
if( aModel.HasGNDClamp() )
{
simul += aModel.m_GNDClamp.Spice( aIndex * 4 + 1, DIE, GC_GND, GC, supply );
}
if( aModel.HasPOWERClamp() )
{
simul += aModel.m_POWERClamp.Spice( aIndex * 4 + 2, PC_PWR, DIE, PC, supply );
}
if( aModel.HasPulldown() )
{
simul += aModel.m_pulldown.Spice( aIndex * 4 + 3, DIE, PD_GND, PD, supply );
}
if( aModel.HasPullup() )
{
simul += aModel.m_pullup.Spice( aIndex * 4 + 4, PU_PWR, DIE, PU, supply );
}
return simul;
}
void KIBIS_PIN::getKuKdFromFile( std::string* aSimul )
{
#ifdef KICAD_SPICE
std::string outputFileName = m_topLevel->m_cacheDir + "temp_output.spice";
if( std::remove( outputFileName.c_str() ) )
{
Report( _( "Cannot remove temporary output file" ), RPT_SEVERITY_WARNING );
}
std::shared_ptr<SPICE_SIMULATOR> ng = SIMULATOR::CreateInstance( "ng-kibis" );
if( !ng )
{
throw std::runtime_error( "Could not create simulator instance" );
return;
}
ng->Init();
ng->LoadNetlist( *aSimul );
std::ifstream KuKdfile;
KuKdfile.open( outputFileName );
std::vector<double> ku, kd, t;
if( KuKdfile )
{
std::string line;
for( int i = 0; i < 11; i++ ) // number of line in the ngspice output header
{
std::getline( KuKdfile, line );
}
int i = 0;
double t_v, ku_v, kd_v;
while( KuKdfile )
{
std::getline( KuKdfile, line );
if( line.empty() )
{
continue;
}
switch( i )
{
case 0:
line = line.substr( line.find_first_of( "\t" ) + 1 );
t_v = std::stod( line );
break;
case 1: ku_v = std::stod( line ); break;
case 2:
kd_v = std::stod( line );
ku.push_back( ku_v );
kd.push_back( kd_v );
t.push_back( t_v );
break;
default: Report( _( "Error while reading temporary file" ), RPT_SEVERITY_ERROR );
}
i = ( i + 1 ) % 3;
}
std::getline( KuKdfile, line );
}
else
{
Report( _( "Error while creating temporary output file" ), RPT_SEVERITY_ERROR );
}
if( std::remove( outputFileName.c_str() ) )
{
Report( _( "Cannot remove temporary output file" ), RPT_SEVERITY_WARNING );
}
m_Ku = ku;
m_Kd = kd;
m_t = t;
#endif
}
std::string KIBIS_PIN::KuKdDriver( KIBIS_MODEL& aModel,
std::pair<IbisWaveform*, IbisWaveform*> aPair,
KIBIS_PARAMETER& aParam, int aIndex )
{
IBIS_CORNER supply = aParam.m_supply;
IBIS_CORNER ccomp = aParam.m_Ccomp;
KIBIS_WAVEFORM* wave = aParam.m_waveform;
std::string simul = "";
simul += "*THIS IS NOT A VALID SPICE MODEL.\n";
simul += "*This part is intended to be executed by Kibis internally.\n";
simul += "*You should not be able to read this.\n\n";
simul += ".SUBCKT DRIVER";
simul += std::to_string( aIndex );
simul += " POWER GND PIN \n"; // 1: POWER, 2:GND, 3:PIN
if( ( aPair.first->m_R_dut == 0 ) && ( aPair.first->m_L_dut == 0 )
&& ( aPair.first->m_C_dut == 0 )
|| true )
{
simul += "Vdummy 2 PIN 0\n";
}
else
{
/*
simul += "RPIN 1 PIN ";
simul << aPair.first->m_R_dut;
simul += "\n";
simul += "LPIN 2 1 ";
simul << aPair.first->m_L_dut;
simul += "\n";
simul += "CPIN PIN GND ";
simul << aPair.first->m_C_dut;
simul += "\n";
*/
Report( _( "Kibis does not support DUT values yet. "
"https://ibis.org/summits/nov16a/chen.pdf" ),
RPT_SEVERITY_WARNING );
}
simul += "\n";
simul += "CCPOMP 2 GND ";
simul += doubleToString( aModel.m_C_comp.value[ccomp] ); //@TODO: Check the corner ?
simul += "\n";
IbisWaveform* risingWF = aPair.first;
IbisWaveform* fallingWF = aPair.second;
switch( wave->GetType() )
{
case KIBIS_WAVEFORM_TYPE::RECTANGULAR:
{
KIBIS_WAVEFORM_RECTANGULAR* rectWave = dynamic_cast<KIBIS_WAVEFORM_RECTANGULAR*>( wave );
if( !rectWave )
{
break;
}
if( rectWave->m_ton < risingWF->m_table.m_entries.back().t )
{
Report( _( "Rising edge is longer than on time." ), RPT_SEVERITY_WARNING );
}
if( rectWave->m_toff < fallingWF->m_table.m_entries.back().t )
{
Report( _( "Falling edge is longer than off time." ), RPT_SEVERITY_WARNING );
}
std::vector<std::pair<int, double>> bits = wave->GenerateBitSequence();
simul += aModel.generateSquareWave( "DIE0", "GND", bits, aPair, aParam );
break;
}
case KIBIS_WAVEFORM_TYPE::PRBS:
{
std::vector<std::pair<int, double>> bits = wave->GenerateBitSequence();
simul += aModel.generateSquareWave( "DIE0", "GND", bits, aPair, aParam );
break;
}
case KIBIS_WAVEFORM_TYPE::STUCK_HIGH:
{
IbisWaveform* waveform = wave->inverted ? risingWF : fallingWF;
simul += "Vsig DIE0 GND ";
simul += doubleToString( waveform->m_table.m_entries.at( 0 ).V.value[supply] );
simul += "\n";
break;
}
case KIBIS_WAVEFORM_TYPE::STUCK_LOW:
{
IbisWaveform* waveform = wave->inverted ? fallingWF : risingWF;
simul += "Vsig DIE0 GND ";
simul += doubleToString( waveform->m_table.m_entries.at( 0 ).V.value[supply] );
simul += "\n";
break;
}
case KIBIS_WAVEFORM_TYPE::NONE:
case KIBIS_WAVEFORM_TYPE::HIGH_Z:
default: break;
}
simul += addDie( aModel, aParam, 0 );
simul += "\n.ENDS DRIVER\n\n";
return simul;
}
void KIBIS_PIN::getKuKdOneWaveform( KIBIS_MODEL& aModel,
std::pair<IbisWaveform*, IbisWaveform*> aPair,
KIBIS_PARAMETER& aParam )
{
IBIS_CORNER supply = aParam.m_supply;
KIBIS_WAVEFORM* wave = aParam.m_waveform;
std::string simul = "";
if( !wave )
return;
if( wave->GetType() == KIBIS_WAVEFORM_TYPE::NONE )
{
//@TODO , there could be some current flowing through pullup / pulldown transistors, even when off
std::vector<double> ku, kd, t;
ku.push_back( 0 );
kd.push_back( 0 );
t.push_back( 0 );
m_Ku = ku;
m_Kd = kd;
m_t = t;
}
else
{
simul += KuKdDriver( aModel, aPair, aParam, 0 );
simul += "\n x1 3 0 1 DRIVER0 \n";
simul += "VCC 3 0 ";
simul += doubleToString( aModel.m_voltageRange.value[supply] );
simul += "\n";
//simul += "Vpin x1.DIE 0 1 \n"
simul += "Lfixture 1 4 ";
simul += doubleToString( aPair.first->m_L_fixture );
simul += "\n";
simul += "Rfixture 4 5 ";
simul += doubleToString( aPair.first->m_R_fixture );
simul += "\n";
simul += "Cfixture 4 0 ";
simul += doubleToString( aPair.first->m_C_fixture );
simul += "\n";
simul += "Vfixture 5 0 ";
simul += doubleToString( aPair.first->m_V_fixture );
simul += "\n";
simul += "VmeasIout x1.DIE0 x1.2 0\n";
simul += "VmeasPD 0 x1.PD_GND0 0\n";
simul += "VmeasPU x1.PU_PWR0 3 0\n";
simul += "VmeasPC x1.PC_PWR0 3 0\n";
simul += "VmeasGC 0 x1.GC_PWR0 0\n";
if( aModel.HasPullup() && aModel.HasPulldown() )
{
Report( _( "Model has only one waveform pair, reduced accuracy" ),
RPT_SEVERITY_WARNING );
simul += "Bku KU 0 v=( (i(VmeasIout)-i(VmeasPC)-i(VmeasGC)-i(VmeasPD) "
")/(i(VmeasPU)-i(VmeasPD)))\n";
simul += "Bkd KD 0 v=(1-v(KU))\n";
}
else if( !aModel.HasPullup() && aModel.HasPulldown() )
{
simul += "Bku KD 0 v=( ( i(VmeasIout)+i(VmeasPC)+i(VmeasGC) )/(i(VmeasPD)))\n";
simul += "Bkd KU 0 v=0\n";
}
else if( aModel.HasPullup() && !aModel.HasPulldown() )
{
simul += "Bku KU 0 v=( ( i(VmeasIout)+i(VmeasPC)+i(VmeasGC) )/(i(VmeasPU)))\n";
simul += "Bkd KD 0 v=0\n";
}
else
{
Report( _( "Driver needs at least a pullup or a pulldown" ), RPT_SEVERITY_ERROR );
}
switch( wave->GetType() )
{
case KIBIS_WAVEFORM_TYPE::PRBS:
case KIBIS_WAVEFORM_TYPE::RECTANGULAR:
{
double duration = wave->GetDuration();
simul += ".tran 0.1n ";
simul += doubleToString( duration );
simul += "\n";
break;
}
case KIBIS_WAVEFORM_TYPE::HIGH_Z:
case KIBIS_WAVEFORM_TYPE::STUCK_LOW:
case KIBIS_WAVEFORM_TYPE::STUCK_HIGH:
default: simul += ".tran 0.5 1 \n"; //
}
//simul += ".dc Vpin -5 5 0.1\n";
simul += ".control run \n";
simul += "set filetype=ascii\n";
simul += "run \n";
//simul += "plot v(x1.DIE0) i(VmeasIout) i(VmeasPD) i(VmeasPU) i(VmeasPC) i(VmeasGC)\n";
//simul += "plot v(KU) v(KD)\n";
std::string outputFileName = m_topLevel->m_cacheDir + "temp_output.spice";
simul += "write " + outputFileName + " v(KU) v(KD)\n";
simul += "quit\n";
simul += ".endc \n";
simul += ".end \n";
getKuKdFromFile( &simul );
}
}
void KIBIS_PIN::getKuKdNoWaveform( KIBIS_MODEL& aModel, KIBIS_PARAMETER& aParam )
{
std::vector<double> ku, kd, t;
KIBIS_WAVEFORM* wave = aParam.m_waveform;
IBIS_CORNER& supply = aParam.m_supply;
if( !wave )
{
return;
}
switch( wave->GetType() )
{
case KIBIS_WAVEFORM_TYPE::RECTANGULAR:
{
KIBIS_WAVEFORM_RECTANGULAR* rectWave = static_cast<KIBIS_WAVEFORM_RECTANGULAR*>( wave );
for( int i = 0; i < rectWave->m_cycles; i++ )
{
ku.push_back( 0 );
kd.push_back( 1 );
t.push_back( ( rectWave->m_ton + rectWave->m_toff ) * i );
ku.push_back( 1 );
kd.push_back( 0 );
t.push_back( ( rectWave->m_ton + rectWave->m_toff ) * i
+ aModel.m_ramp.m_rising.value[supply].m_dt
/ 0.6 ); // 0.6 because ibis only gives 20%-80% time
ku.push_back( 1 );
kd.push_back( 0 );
t.push_back( ( rectWave->m_ton + rectWave->m_toff ) * i + rectWave->m_toff );
ku.push_back( 0 );
kd.push_back( 1 );
t.push_back( ( rectWave->m_ton + rectWave->m_toff ) * i + rectWave->m_toff
+ aModel.m_ramp.m_falling.value[supply].m_dt / 0.6 );
}
break;
}
case KIBIS_WAVEFORM_TYPE::STUCK_HIGH:
{
ku.push_back( wave->inverted ? 0 : 1 );
kd.push_back( wave->inverted ? 1 : 0 );
t.push_back( 0 );
break;
}
case KIBIS_WAVEFORM_TYPE::STUCK_LOW:
{
ku.push_back( wave->inverted ? 1 : 0 );
kd.push_back( wave->inverted ? 0 : 1 );
t.push_back( 0 );
break;
}
case KIBIS_WAVEFORM_TYPE::HIGH_Z:
case KIBIS_WAVEFORM_TYPE::NONE:
default:
ku.push_back( 0 );
kd.push_back( 0 );
t.push_back( 0 );
}
m_Ku = ku;
m_Kd = kd;
m_t = t;
}
void KIBIS_PIN::getKuKdTwoWaveforms( KIBIS_MODEL& aModel,
std::pair<IbisWaveform*, IbisWaveform*> aPair1,
std::pair<IbisWaveform*, IbisWaveform*> aPair2,
KIBIS_PARAMETER& aParam )
{
std::string simul = "";
IBIS_CORNER supply = aParam.m_supply;
KIBIS_WAVEFORM* wave = aParam.m_waveform;
if( !wave )
return;
if( wave->GetType() == KIBIS_WAVEFORM_TYPE::NONE )
{
//@TODO , there could be some current flowing through pullup / pulldown transistors, even when off
std::vector<double> ku, kd, t;
ku.push_back( 0 );
kd.push_back( 0 );
t.push_back( 0 );
m_Ku = ku;
m_Kd = kd;
m_t = t;
}
else
{
simul += KuKdDriver( aModel, aPair1, aParam, 0 );
simul += KuKdDriver( aModel, aPair2, aParam, 1 );
simul += "\n x1 3 0 1 DRIVER0 \n";
simul += "VCC 3 0 ";
simul += doubleToString( aModel.m_voltageRange.value[supply] );
simul += "\n";
//simul += "Vpin x1.DIE 0 1 \n"
simul += "Lfixture0 1 4 ";
simul += doubleToString( aPair1.first->m_L_fixture );
simul += "\n";
simul += "Rfixture0 4 5 ";
simul += doubleToString( aPair1.first->m_R_fixture );
simul += "\n";
simul += "Cfixture0 4 0 ";
simul += doubleToString( aPair1.first->m_C_fixture );
simul += "\n";
simul += "Vfixture0 5 0 ";
simul += doubleToString( aPair1.first->m_V_fixture );
simul += "\n";
simul += "VmeasIout0 x1.2 x1.DIE0 0\n";
simul += "VmeasPD0 0 x1.PD_GND0 0\n";
simul += "VmeasPU0 x1.PU_PWR0 3 0\n";
simul += "VmeasPC0 x1.PC_PWR0 3 0\n";
simul += "VmeasGC0 0 x1.GC_PWR0 0\n";
simul += "\n x2 3 0 7 DRIVER1 \n";
//simul += "Vpin x1.DIE 0 1 \n"
simul += "Lfixture1 7 8 ";
simul += doubleToString( aPair2.first->m_L_fixture );
simul += "\n";
simul += "Rfixture1 8 9 ";
simul += doubleToString( aPair2.first->m_R_fixture );
simul += "\n";
simul += "Cfixture1 8 0 ";
simul += doubleToString( aPair2.first->m_C_fixture );
simul += "\n";
simul += "Vfixture1 9 0 ";
simul += doubleToString( aPair2.first->m_V_fixture );
simul += "\n";
simul += "VmeasIout1 x2.2 x2.DIE0 0\n";
simul += "VmeasPD1 0 x2.PD_GND0 0\n";
simul += "VmeasPU1 x2.PU_PWR0 3 0\n";
simul += "VmeasPC1 x2.PC_PWR0 3 0\n";
simul += "VmeasGC1 0 x2.GC_PWR0 0\n";
if( aModel.HasPullup() && aModel.HasPulldown() )
{
simul +=
"Bku KU 0 v=( ( i(VmeasPD1) * ( i(VmeasIout0) + i(VmeasPC0) + i(VmeasGC0) ) - "
"i(VmeasPD0) * ( i(VmeasIout1) + i(VmeasPC1) + i(VmeasGC1) ) )/ ( i(VmeasPU1) "
"* "
"i(VmeasPD0) - i(VmeasPU0) * i(VmeasPD1) ) )\n";
simul +=
"Bkd KD 0 v=( ( i(VmeasPU1) * ( i(VmeasIout0) + i(VmeasPC0) + i(VmeasGC0) ) - "
"i(VmeasPU0) * ( i(VmeasIout1) + i(VmeasPC1) + i(VmeasGC1) ) )/ ( i(VmeasPD1) "
"* "
"i(VmeasPU0) - i(VmeasPD0) * i(VmeasPU1) ) )\n";
//simul += "Bkd KD 0 v=(1-v(KU))\n";
}
else if( !aModel.HasPullup() && aModel.HasPulldown() )
{
Report( _( "There are two waveform pairs, but only one transistor. More equations than "
"unknowns." ),
RPT_SEVERITY_WARNING );
simul += "Bku KD 0 v=( ( i(VmeasIout0)+i(VmeasPC0)+i(VmeasGC0) )/(i(VmeasPD0)))\n";
simul += "Bkd KU 0 v=0\n";
}
else if( aModel.HasPullup() && !aModel.HasPulldown() )
{
Report( _( "There are two waveform pairs, but only one transistor. More equations than "
"unknowns." ),
RPT_SEVERITY_WARNING );
simul += "Bku KU 0 v=( ( i(VmeasIout)+i(VmeasPC)+i(VmeasGC) )/(i(VmeasPU)))\n";
simul += "Bkd KD 0 v=0\n";
}
else
{
Report( _( "Driver needs at least a pullup or a pulldown" ), RPT_SEVERITY_ERROR );
}
switch( wave->GetType() )
{
case KIBIS_WAVEFORM_TYPE::RECTANGULAR:
case KIBIS_WAVEFORM_TYPE::PRBS:
{
double duration = wave->GetDuration();
simul += ".tran 0.1n ";
simul += doubleToString( duration );
simul += "\n";
break;
}
case KIBIS_WAVEFORM_TYPE::HIGH_Z:
case KIBIS_WAVEFORM_TYPE::STUCK_LOW:
case KIBIS_WAVEFORM_TYPE::STUCK_HIGH:
default: simul += ".tran 0.5 1 \n"; //
}
//simul += ".dc Vpin -5 5 0.1\n";
simul += ".control run \n";
simul += "set filetype=ascii\n";
simul += "run \n";
simul += "plot v(KU) v(KD)\n";
//simul += "plot v(x1.DIE0) \n";
std::string outputFileName = m_topLevel->m_cacheDir + "temp_output.spice";
simul += "write " + outputFileName + " v(KU) v(KD)\n";
simul += "quit\n";
simul += ".endc \n";
simul += ".end \n";
getKuKdFromFile( &simul );
}
}
bool KIBIS_PIN::writeSpiceDriver( std::string* aDest, std::string aName, KIBIS_MODEL& aModel,
KIBIS_PARAMETER& aParam )
{
bool status = true;
switch( aModel.m_type )
{
case IBIS_MODEL_TYPE::OUTPUT:
case IBIS_MODEL_TYPE::IO:
case IBIS_MODEL_TYPE::THREE_STATE:
case IBIS_MODEL_TYPE::OPEN_DRAIN:
case IBIS_MODEL_TYPE::IO_OPEN_DRAIN:
case IBIS_MODEL_TYPE::OPEN_SINK:
case IBIS_MODEL_TYPE::IO_OPEN_SINK:
case IBIS_MODEL_TYPE::OPEN_SOURCE:
case IBIS_MODEL_TYPE::IO_OPEN_SOURCE:
case IBIS_MODEL_TYPE::OUTPUT_ECL:
case IBIS_MODEL_TYPE::IO_ECL:
case IBIS_MODEL_TYPE::THREE_STATE_ECL:
{
std::string result;
std::string tmp;
result = "\n*Driver model generated by Kicad using Ibis data. ";
result += "\n*Component: ";
if( m_parent )
{
//result += m_parent->m_name;
}
result += "\n*Manufacturer: ";
if( m_parent )
{
//result += m_parent->m_manufacturer;
}
result += "\n*Pin number: ";
result += m_pinNumber;
result += "\n*Signal name: ";
result += m_signalName;
result += "\n*Model: ";
result += aModel.m_name;
result += "\n.SUBCKT ";
result += aName;
result += " GND PIN \n";
result += "\n";
result += "RPIN 1 PIN ";
result += doubleToString( m_Rpin.value[aParam.m_Rpin] );
result += "\n";
result += "LPIN DIE0 1 ";
result += doubleToString( m_Lpin.value[aParam.m_Lpin] );
result += "\n";
result += "CPIN PIN GND ";
result += doubleToString( m_Cpin.value[aParam.m_Cpin] );
result += "\n";
std::vector<std::pair<IbisWaveform*, IbisWaveform*>> wfPairs = aModel.waveformPairs();
KIBIS_ACCURACY accuracy = aParam.m_accuracy;
if( wfPairs.size() < 1 || accuracy <= KIBIS_ACCURACY::LEVEL_0 )
{
if( accuracy > KIBIS_ACCURACY::LEVEL_0 )
{
Report( _( "Model has no waveform pair, using [Ramp] instead, poor accuracy" ),
RPT_SEVERITY_INFO );
}
getKuKdNoWaveform( aModel, aParam );
}
else if( wfPairs.size() == 1 || accuracy <= KIBIS_ACCURACY::LEVEL_1 )
{
getKuKdOneWaveform( aModel, wfPairs.at( 0 ), aParam );
}
else
{
if( wfPairs.size() > 2 || accuracy <= KIBIS_ACCURACY::LEVEL_2 )
{
Report( _( "Model has more than 2 waveform pairs, using the first two." ),
RPT_SEVERITY_WARNING );
}
getKuKdTwoWaveforms( aModel, wfPairs.at( 0 ), wfPairs.at( 1 ), aParam );
}
result += "Vku KU GND pwl ( ";
for( size_t i = 0; i < m_t.size(); i++ )
{
result += doubleToString( m_t.at( i ) );
result += " ";
result += doubleToString( m_Ku.at( i ) );
result += " ";
}
result += ") \n";
result += "Vkd KD GND pwl ( ";
for( size_t i = 0; i < m_t.size(); i++ )
{
result += doubleToString( m_t.at( i ) );
result += " ";
result += doubleToString( m_Kd.at( i ) );
result += " ";
}
result += ") \n";
result += aModel.SpiceDie( aParam, 0 );
result += "\n.ENDS DRIVER\n\n";
*aDest += result;
break;
}
default: Report( _( "Invalid model type for a driver." ), RPT_SEVERITY_ERROR ); status = false;
}
return status;
}
bool KIBIS_PIN::writeSpiceDevice( std::string* aDest, std::string aName, KIBIS_MODEL& aModel,
KIBIS_PARAMETER& aParam )
{
bool status = true;
switch( aModel.m_type )
{
case IBIS_MODEL_TYPE::INPUT:
case IBIS_MODEL_TYPE::IO:
case IBIS_MODEL_TYPE::IO_OPEN_DRAIN:
case IBIS_MODEL_TYPE::IO_OPEN_SINK:
case IBIS_MODEL_TYPE::IO_OPEN_SOURCE:
case IBIS_MODEL_TYPE::IO_ECL:
{
std::string result;
std::string tmp;
result += "\n";
result = "*Device model generated by Kicad using Ibis data.";
result += "\n.SUBCKT ";
result += aName;
result += " GND PIN\n";
result += "\n";
result += "\n";
result += "RPIN 1 PIN ";
result += doubleToString( m_Rpin.value[aParam.m_Rpin] );
result += "\n";
result += "LPIN DIE 1 ";
result += doubleToString( m_Lpin.value[aParam.m_Lpin] );
result += "\n";
result += "CPIN PIN GND ";
result += doubleToString( m_Cpin.value[aParam.m_Cpin] );
result += "\n";
result += "Vku KU GND pwl ( 0 0 )\n";
result += "Vkd KD GND pwl ( 0 0 )\n";
result += aModel.SpiceDie( aParam, 0 );
result += "\n.ENDS DRIVER\n\n";
*aDest = result;
break;
}
default: Report( _( "Invalid model type for a device" ), RPT_SEVERITY_ERROR ); status = false;
}
return status;
}
bool KIBIS_PIN::writeSpiceDiffDriver( std::string* aDest, std::string aName, KIBIS_MODEL& aModel,
KIBIS_PARAMETER& aParam )
{
bool status = true;
KIBIS_WAVEFORM* wave = aParam.m_waveform;
if( !wave )
return false;
std::string result;
result = "\n*Differential driver model generated by Kicad using Ibis data. ";
result += "\n*Component: ";
if( m_parent )
{
//result += m_parent->m_name;
}
result += "\n*Manufacturer: ";
if( m_parent )
{
//result += m_parent->m_manufacturer;
}
result += "\n.SUBCKT ";
result += aName;
result += " GND PIN_P PIN_N\n";
result += "\n";
status &= writeSpiceDriver( &result, aName + "_P", aModel, aParam );
wave->inverted = !wave->inverted;
status &= writeSpiceDriver( &result, aName + "_N", aModel, aParam );
wave->inverted = !wave->inverted;
result += "\n";
result += "x1 GND PIN_P " + aName + "_P \n";
result += "x2 GND PIN_N " + aName + "_N \n";
result += "\n";
result += "\n.ENDS " + aName + "\n\n";
if( status )
{
*aDest += result;
}
return status;
}
bool KIBIS_PIN::writeSpiceDiffDevice( std::string* aDest, std::string aName, KIBIS_MODEL& aModel,
KIBIS_PARAMETER& aParam )
{
bool status = true;
std::string result;
result = "\n*Differential device model generated by Kicad using Ibis data. ";
result += "\n*Component: ";
if( m_parent )
{
//result += m_parent->m_name;
}
result += "\n*Manufacturer: ";
if( m_parent )
{
//result += m_parent->m_manufacturer;
}
result += "\n.SUBCKT ";
result += aName;
result += " GND PIN_P PIN_N\n";
result += "\n";
status &= writeSpiceDevice( &result, aName + "_P", aModel, aParam );
status &= writeSpiceDevice( &result, aName + "_N", aModel, aParam );
result += "\n";
result += "x1 GND PIN_P " + aName + "_P \n";
result += "x2 GND PIN_N " + aName + "_N \n";
result += "\n";
result += "\n.ENDS " + aName + "\n\n";
if( status )
{
*aDest += result;
}
return status;
}
KIBIS_MODEL* KIBIS::GetModel( std::string aName )
{
for( KIBIS_MODEL& model : m_models )
{
if( model.m_name == aName )
return &model;
}
return nullptr;
}
KIBIS_COMPONENT* KIBIS::GetComponent( std::string aName )
{
for( KIBIS_COMPONENT& cmp : m_components )
{
if( cmp.m_name == aName )
return &cmp;
}
return nullptr;
}
void KIBIS_PARAMETER::SetCornerFromString( IBIS_CORNER& aCorner, std::string aString )
{
if( aString == "MIN" )
aCorner = IBIS_CORNER::MIN;
else if( aString == "MAX" )
aCorner = IBIS_CORNER::MAX;
else
aCorner = IBIS_CORNER::TYP;
}
std::vector<std::pair<int, double>> KIBIS_WAVEFORM_STUCK_HIGH::GenerateBitSequence()
{
std::vector<std::pair<int, double>> bits;
std::pair<int, double> bit;
bit.first = inverted ? 1 : 0;
bit.second = 0;
return bits;
}
std::vector<std::pair<int, double>> KIBIS_WAVEFORM_STUCK_LOW::GenerateBitSequence()
{
std::vector<std::pair<int, double>> bits;
std::pair<int, double> bit;
bit.first = inverted ? 0 : 1;
bit.second = 0;
return bits;
}
std::vector<std::pair<int, double>> KIBIS_WAVEFORM_HIGH_Z::GenerateBitSequence()
{
std::vector<std::pair<int, double>> bits;
return bits;
}
std::vector<std::pair<int, double>> KIBIS_WAVEFORM_RECTANGULAR::GenerateBitSequence()
{
std::vector<std::pair<int, double>> bits;
for( int i = 0; i < m_cycles; i++ )
{
std::pair<int, double> bit;
bit.first = inverted ? 0 : 1;
bit.second = ( m_ton + m_toff ) * i + m_delay;
bits.push_back( bit );
bit.first = inverted ? 1 : 0;
bit.second = ( m_ton + m_toff ) * i + m_delay + m_ton;
bits.push_back( bit );
}
return bits;
}
std::vector<std::pair<int, double>> KIBIS_WAVEFORM_PRBS::GenerateBitSequence()
{
std::vector<std::pair<int, double>> bitSequence;
uint8_t polynomial = 0b1100000;
//1100000 = x^7+x^6+1
//10100 = x^5+x^3+1
//110 = x^3+x^2+1
uint8_t seed = 0x12; // Any non zero state
uint8_t lfsr = seed;
if ( m_bitrate == 0 )
return bitSequence;
double period = 1/m_bitrate;
double t = 0;
m_bits = abs( m_bits ); // Just to be sure.
int bits = 0;
do
{
uint8_t lsb = lfsr & 0x01;
bitSequence.emplace_back( ( inverted ^ lsb ? 1 : 0 ), t );
lfsr = lfsr >> 1;
if ( lsb )
lfsr ^= polynomial;
t += period;
} while ( ++bits < m_bits );
return bitSequence;
}
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