kicad/pcbnew/router/pns_diff_pair_placer.cpp

860 lines
20 KiB
C++

/*
* KiRouter - a push-and-(sometimes-)shove PCB router
*
* Copyright (C) 2013-2015 CERN
* Author: Tomasz Wlostowski <tomasz.wlostowski@cern.ch>
*
* 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 3 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, see <http://www.gnu.org/licenses/>.
*/
#include <boost/foreach.hpp>
#include <boost/optional.hpp>
#include <colors.h>
#include <class_board.h>
#include <class_board_item.h>
#include <class_netinfo.h>
#include "trace.h"
#include "pns_node.h"
#include "pns_walkaround.h"
#include "pns_shove.h"
#include "pns_utils.h"
#include "pns_router.h"
#include "pns_diff_pair_placer.h"
#include "pns_solid.h"
#include "pns_topology.h"
using boost::optional;
PNS_DIFF_PAIR_PLACER::PNS_DIFF_PAIR_PLACER( PNS_ROUTER* aRouter ) :
PNS_PLACEMENT_ALGO( aRouter )
{
m_state = RT_START;
m_chainedPlacement = false;
m_initialDiagonal = false;
m_startDiagonal = false;
m_fitOk = false;
m_netP = 0;
m_netN = 0;
m_iteration = 0;
m_world = NULL;
m_shove = NULL;
m_currentNode = NULL;
m_lastNode = NULL;
m_placingVia = false;
m_viaDiameter = 0;
m_viaDrill = 0;
m_currentWidth = 0;
m_currentNet = 0;
m_currentLayer = 0;
m_startsOnVia = false;
m_orthoMode = false;
m_snapOnTarget = false;
m_currentEndItem = NULL;
m_currentMode = RM_MarkObstacles;
m_idle = true;
}
PNS_DIFF_PAIR_PLACER::~PNS_DIFF_PAIR_PLACER()
{
if( m_shove )
delete m_shove;
}
void PNS_DIFF_PAIR_PLACER::setWorld( PNS_NODE* aWorld )
{
m_world = aWorld;
}
const PNS_VIA PNS_DIFF_PAIR_PLACER::makeVia( const VECTOR2I& aP, int aNet )
{
const PNS_LAYERSET layers( m_sizes.GetLayerTop(), m_sizes.GetLayerBottom() );
PNS_VIA v( aP, layers, m_sizes.ViaDiameter(), m_sizes.ViaDrill(), -1, m_sizes.ViaType() );
v.SetNet( aNet );
return v;
}
void PNS_DIFF_PAIR_PLACER::SetOrthoMode ( bool aOrthoMode )
{
m_orthoMode = aOrthoMode;
if( !m_idle )
Move( m_currentEnd, NULL );
}
bool PNS_DIFF_PAIR_PLACER::ToggleVia( bool aEnabled )
{
m_placingVia = aEnabled;
if( !m_idle )
Move( m_currentEnd, NULL );
return true;
}
bool PNS_DIFF_PAIR_PLACER::rhMarkObstacles( const VECTOR2I& aP )
{
if( !routeHead( aP ) )
return false;
bool collP = static_cast<bool>( m_currentNode->CheckColliding( &m_currentTrace.PLine() ) );
bool collN = static_cast<bool>( m_currentNode->CheckColliding( &m_currentTrace.NLine() ) );
m_fitOk = !( collP || collN ) ;
return m_fitOk;
}
bool PNS_DIFF_PAIR_PLACER::propagateDpHeadForces ( const VECTOR2I& aP, VECTOR2I& aNewP )
{
PNS_VIA virtHead = makeVia( aP, -1 );
if( m_placingVia )
virtHead.SetDiameter( viaGap() + 2 * virtHead.Diameter() );
else
{
virtHead.SetLayer( m_currentLayer );
virtHead.SetDiameter( m_sizes.DiffPairGap() + 2 * m_sizes.TrackWidth() );
}
VECTOR2I lead( 0, 0 );// = aP - m_currentStart ;
VECTOR2I force;
bool solidsOnly = true;
if( m_currentMode == RM_MarkObstacles )
{
aNewP = aP;
return true;
}
else if( m_currentMode == RM_Walkaround )
{
solidsOnly = false;
}
// fixme: I'm too lazy to do it well. Circular approximaton will do for the moment.
if( virtHead.PushoutForce( m_currentNode, lead, force, solidsOnly, 40 ) )
{
aNewP = aP + force;
return true;
}
return false;
}
bool PNS_DIFF_PAIR_PLACER::attemptWalk ( PNS_NODE* aNode, PNS_DIFF_PAIR* aCurrent, PNS_DIFF_PAIR& aWalk, bool aPFirst, bool aWindCw, bool aSolidsOnly )
{
PNS_WALKAROUND walkaround( aNode, Router() );
PNS_WALKAROUND::WALKAROUND_STATUS wf1;
Router()->GetClearanceFunc()->OverrideClearance( true, aCurrent->NetP(), aCurrent->NetN(), aCurrent->Gap() );
walkaround.SetSolidsOnly( aSolidsOnly );
walkaround.SetIterationLimit( Settings().WalkaroundIterationLimit() );
PNS_SHOVE shove( aNode, Router() );
PNS_LINE walkP, walkN;
aWalk = *aCurrent;
int iter = 0;
PNS_DIFF_PAIR cur( *aCurrent );
bool currentIsP = aPFirst;
int mask = aSolidsOnly ? PNS_ITEM::SOLID : PNS_ITEM::ANY;
do
{
PNS_LINE preWalk = ( currentIsP ? cur.PLine() : cur.NLine() );
PNS_LINE preShove = ( currentIsP ? cur.NLine() : cur.PLine() );
PNS_LINE postWalk;
if( !aNode->CheckColliding ( &preWalk, mask ) )
{
currentIsP = !currentIsP;
if( !aNode->CheckColliding( &preShove, mask ) )
break;
else
continue;
}
wf1 = walkaround.Route( preWalk, postWalk, false );
if( wf1 != PNS_WALKAROUND::DONE )
return false;
PNS_LINE postShove( preShove );
shove.ForceClearance( true, cur.Gap() - 2 * PNS_HULL_MARGIN );
PNS_SHOVE::SHOVE_STATUS sh1;
sh1 = shove.ProcessSingleLine( postWalk, preShove, postShove );
if( sh1 != PNS_SHOVE::SH_OK )
return false;
postWalk.Line().Simplify();
postShove.Line().Simplify();
cur.SetShape( postWalk.CLine(), postShove.CLine(), !currentIsP );
currentIsP = !currentIsP;
if( !aNode->CheckColliding( &postShove, mask ) )
break;
iter++;
}
while( iter < 3 );
if( iter == 3 )
return false;
aWalk.SetShape( cur.CP(), cur.CN() );
Router()->GetClearanceFunc()->OverrideClearance( false );
return true;
}
bool PNS_DIFF_PAIR_PLACER::tryWalkDp( PNS_NODE* aNode, PNS_DIFF_PAIR &aPair, bool aSolidsOnly )
{
PNS_DIFF_PAIR best;
double bestScore = 100000000000000.0;
for( int attempt = 0; attempt <= 1; attempt++ )
{
PNS_DIFF_PAIR p;
PNS_NODE *tmp = m_currentNode->Branch();
bool pfirst = attempt % 2 ? true : false;
bool wind_cw = attempt / 2 ? true : false;
if( attemptWalk ( tmp, &aPair, p, pfirst, wind_cw, aSolidsOnly ) )
{
// double len = p.TotalLength();
double cl = p.CoupledLength();
double skew = p.Skew();
double score = cl + fabs(skew) * 3.0;
if( score < bestScore )
{
bestScore = score;
best = p;
}
}
delete tmp;
}
if( bestScore > 0.0 )
{
PNS_OPTIMIZER optimizer( m_currentNode );
aPair.SetShape( best );
optimizer.Optimize( &aPair );
return true;
}
return false;
}
bool PNS_DIFF_PAIR_PLACER::rhWalkOnly( const VECTOR2I& aP )
{
if( !routeHead ( aP ) )
return false;
m_fitOk = tryWalkDp( m_currentNode, m_currentTrace, false );
return m_fitOk;
}
bool PNS_DIFF_PAIR_PLACER::route( const VECTOR2I& aP )
{
switch( m_currentMode )
{
case RM_MarkObstacles:
return rhMarkObstacles( aP );
case RM_Walkaround:
return rhWalkOnly( aP );
case RM_Shove:
return rhShoveOnly( aP );
default:
break;
}
return false;
}
bool PNS_DIFF_PAIR_PLACER::rhShoveOnly( const VECTOR2I& aP )
{
m_currentNode = m_shove->CurrentNode();
bool ok = routeHead( aP );
m_fitOk = false;
if( !ok )
return false;
if( !tryWalkDp( m_currentNode, m_currentTrace, true ) )
return false;
PNS_LINE pLine( m_currentTrace.PLine() );
PNS_LINE nLine( m_currentTrace.NLine() );
PNS_ITEMSET head;
head.Add( &pLine );
head.Add( &nLine );
PNS_SHOVE::SHOVE_STATUS status = m_shove->ShoveMultiLines( head );
m_currentNode = m_shove->CurrentNode();
if( status == PNS_SHOVE::SH_OK )
{
m_currentNode = m_shove->CurrentNode();
if( !m_currentNode->CheckColliding( &m_currentTrace.PLine() ) &&
!m_currentNode->CheckColliding( &m_currentTrace.NLine() ) )
{
m_fitOk = true;
}
}
return m_fitOk;
}
const PNS_ITEMSET PNS_DIFF_PAIR_PLACER::Traces()
{
PNS_ITEMSET t;
t.Add( const_cast<PNS_LINE*>( &m_currentTrace.PLine() ) );
t.Add( const_cast<PNS_LINE*>( &m_currentTrace.NLine() ) );
return t;
}
void PNS_DIFF_PAIR_PLACER::FlipPosture()
{
m_startDiagonal = !m_startDiagonal;
if( !m_idle )
Move( m_currentEnd, NULL );
}
PNS_NODE* PNS_DIFF_PAIR_PLACER::CurrentNode( bool aLoopsRemoved ) const
{
if( m_lastNode )
return m_lastNode;
return m_currentNode;
}
bool PNS_DIFF_PAIR_PLACER::SetLayer( int aLayer )
{
if( m_idle )
{
m_currentLayer = aLayer;
return true;
} else if( m_chainedPlacement )
return false;
else if( !m_prevPair )
return false;
else if( m_prevPair->PrimP() || ( m_prevPair->PrimP()->OfKind( PNS_ITEM::VIA ) &&
m_prevPair->PrimP()->Layers().Overlaps( aLayer ) ) )
{
m_currentLayer = aLayer;
m_start = *m_prevPair;
initPlacement( false );
Move( m_currentEnd, NULL );
return true;
}
return false;
}
int PNS_DIFF_PAIR_PLACER::matchDpSuffix( wxString aNetName, wxString& aComplementNet, wxString& aBaseDpName )
{
int rv = 0;
if( aNetName.EndsWith( "+" ) )
{
aComplementNet = "-";
rv = 1;
}
else if( aNetName.EndsWith( "_P" ) )
{
aComplementNet = "_N";
rv = 1;
}
else if( aNetName.EndsWith( "-" ) )
{
aComplementNet = "+";
rv = -1;
}
else if( aNetName.EndsWith( "_N" ) )
{
aComplementNet = "_P";
rv = -1;
}
if( rv != 0 )
{
aBaseDpName = aNetName.Left( aNetName.Length() - aComplementNet.Length() );
}
return rv;
}
OPT_VECTOR2I PNS_DIFF_PAIR_PLACER::getDanglingAnchor( PNS_NODE* aNode, PNS_ITEM* aItem )
{
switch( aItem->Kind() )
{
case PNS_ITEM::VIA:
case PNS_ITEM::SOLID:
return aItem->Anchor( 0 );
case PNS_ITEM::SEGMENT:
{
PNS_SEGMENT* s =static_cast<PNS_SEGMENT*>( aItem );
PNS_JOINT* jA = aNode->FindJoint( s->Seg().A, s );
PNS_JOINT* jB = aNode->FindJoint( s->Seg().B, s );
if( jA->LinkCount() == 1 )
return s->Seg().A;
else if( jB->LinkCount() == 1 )
return s->Seg().B;
else
return OPT_VECTOR2I();
}
default:
return OPT_VECTOR2I();
break;
}
}
bool PNS_DIFF_PAIR_PLACER::findDpPrimitivePair( const VECTOR2I& aP, PNS_ITEM* aItem, PNS_DP_PRIMITIVE_PAIR& aPair )
{
if( !aItem || !aItem->Parent() || !aItem->Parent()->GetNet() )
return false;
wxString netNameP = aItem->Parent()->GetNet()->GetNetname();
wxString netNameN, netNameBase;
BOARD* brd = Router()->GetBoard();
PNS_ITEM *primRef = NULL, *primP = NULL, *primN = NULL;
int refNet;
wxString suffix;
int r = matchDpSuffix ( netNameP, suffix, netNameBase );
if( r == 0 )
return false;
else if( r == 1 )
{
primRef = primP = static_cast<PNS_SOLID*>( aItem );
netNameN = netNameBase + suffix;
}
else
{
primRef = primN = static_cast<PNS_SOLID*>( aItem );
netNameN = netNameP;
netNameP = netNameBase + suffix;
}
NETINFO_ITEM* netInfoP = brd->FindNet( netNameP );
NETINFO_ITEM* netInfoN = brd->FindNet( netNameN );
if( !netInfoP || !netInfoN )
return false;
int netP = netInfoP->GetNet();
int netN = netInfoN->GetNet();
if( primP )
refNet = netN;
else
refNet = netP;
std::set<PNS_ITEM*> items;
OPT_VECTOR2I refAnchor = getDanglingAnchor( m_currentNode, primRef );
if( !refAnchor )
return false;
m_currentNode->AllItemsInNet( refNet, items );
double bestDist = std::numeric_limits<double>::max();
bool found = false;
BOOST_FOREACH( PNS_ITEM* item, items )
{
if( item->Kind() == aItem->Kind() )
{
OPT_VECTOR2I anchor = getDanglingAnchor( m_currentNode, item );
if( !anchor )
continue;
double dist = ( *anchor - *refAnchor ).EuclideanNorm();
bool shapeMatches = true;
if( item->OfKind( PNS_ITEM::SOLID ) && item->Layers() != aItem->Layers() )
{
shapeMatches = false;
}
if( dist < bestDist && shapeMatches )
{
found = true;
bestDist = dist;
if( refNet == netP )
{
aPair = PNS_DP_PRIMITIVE_PAIR ( item, primRef );
aPair.SetAnchors( *anchor, *refAnchor );
}
else
{
aPair = PNS_DP_PRIMITIVE_PAIR( primRef, item );
aPair.SetAnchors( *refAnchor, *anchor );
}
}
}
}
return found;
}
int PNS_DIFF_PAIR_PLACER::viaGap() const
{
return m_sizes.DiffPairViaGap();
}
int PNS_DIFF_PAIR_PLACER::gap() const
{
return m_sizes.DiffPairGap() + m_sizes.DiffPairWidth();
}
bool PNS_DIFF_PAIR_PLACER::Start( const VECTOR2I& aP, PNS_ITEM* aStartItem )
{
VECTOR2I p( aP );
bool split;
if( Router()->SnappingEnabled() )
p = Router()->SnapToItem( aStartItem, aP, split );
if( !aStartItem )
{
Router()->SetFailureReason( _( "Can't start a differential pair "
" in the middle of nowhere." ) );
return false;
}
m_currentNode = Router()->GetWorld();
if( !findDpPrimitivePair( aP, aStartItem, m_start ) )
{
Router()->SetFailureReason( _( "Unable to find complementary differential pair "
"net. Make sure the names of the nets belonging "
"to a differential pair end with either _N/_P or +/-." ) );
return false;
}
m_netP = m_start.PrimP()->Net();
m_netN = m_start.PrimN()->Net();
// Check if the current track/via gap & track width settings are violated
BOARD* brd = Router()->GetBoard();
NETCLASSPTR netclassP = brd->FindNet( m_netP )->GetNetClass();
NETCLASSPTR netclassN = brd->FindNet( m_netN )->GetNetClass();
int clearance = std::min( m_sizes.DiffPairGap(), m_sizes.DiffPairViaGap() );
if( clearance < netclassP->GetClearance() || clearance < netclassN->GetClearance() )
{
Router()->SetFailureReason( _( "Current track/via gap setting violates "
"design rules for this net." ) );
return false;
}
if( m_sizes.DiffPairWidth() < brd->GetDesignSettings().m_TrackMinWidth )
{
Router()->SetFailureReason( _( "Current track width setting violates design rules." ) );
return false;
}
m_currentStart = p;
m_currentEnd = p;
m_placingVia = false;
m_chainedPlacement = false;
initPlacement( false );
return true;
}
void PNS_DIFF_PAIR_PLACER::initPlacement( bool aSplitSeg )
{
m_idle = false;
m_orthoMode = false;
m_currentEndItem = NULL;
m_startDiagonal = m_initialDiagonal;
PNS_NODE* world = Router()->GetWorld();
world->KillChildren();
PNS_NODE* rootNode = world->Branch();
setWorld( rootNode );
m_lastNode = NULL;
m_currentNode = rootNode;
m_currentMode = Settings().Mode();
if( m_shove )
delete m_shove;
m_shove = NULL;
if( m_currentMode == RM_Shove || m_currentMode == RM_Smart )
{
m_shove = new PNS_SHOVE( m_currentNode, Router() );
}
}
bool PNS_DIFF_PAIR_PLACER::routeHead( const VECTOR2I& aP )
{
m_fitOk = false;
PNS_DP_GATEWAYS gwsEntry( gap() );
PNS_DP_GATEWAYS gwsTarget( gap() );
if( !m_prevPair )
m_prevPair = m_start;
gwsEntry.BuildFromPrimitivePair( *m_prevPair, m_startDiagonal );
PNS_DP_PRIMITIVE_PAIR target;
if( findDpPrimitivePair ( aP, m_currentEndItem, target ) )
{
gwsTarget.BuildFromPrimitivePair( target, m_startDiagonal );
m_snapOnTarget = true;
} else {
VECTOR2I fp;
if( !propagateDpHeadForces( aP, fp ) )
return false;
gwsTarget.SetFitVias( m_placingVia, m_sizes.ViaDiameter(), viaGap() );
gwsTarget.BuildForCursor( fp );
gwsTarget.BuildOrthoProjections( gwsEntry, fp, m_orthoMode ? 200 : -200 );
m_snapOnTarget = false;
}
m_currentTrace = PNS_DIFF_PAIR();
m_currentTrace.SetGap( gap() );
m_currentTrace.SetLayer( m_currentLayer );
if ( gwsEntry.FitGateways( gwsEntry, gwsTarget, m_startDiagonal, m_currentTrace ) )
{
m_currentTrace.SetNets( m_netP, m_netN );
m_currentTrace.SetWidth( m_sizes.DiffPairWidth() );
m_currentTrace.SetGap( m_sizes.DiffPairGap() );
if( m_placingVia )
{
m_currentTrace.AppendVias ( makeVia ( m_currentTrace.CP().CPoint(-1), m_netP ),
makeVia ( m_currentTrace.CN().CPoint(-1), m_netN ) );
}
return true;
}
return false;
}
bool PNS_DIFF_PAIR_PLACER::Move( const VECTOR2I& aP , PNS_ITEM* aEndItem )
{
m_currentEndItem = aEndItem;
m_fitOk = false;
delete m_lastNode;
m_lastNode = NULL;
if( !route( aP ) )
return false;
PNS_NODE* latestNode = m_currentNode;
m_lastNode = latestNode->Branch();
assert( m_lastNode != NULL );
m_currentEnd = aP;
updateLeadingRatLine();
return true;
}
void PNS_DIFF_PAIR_PLACER::UpdateSizes( const PNS_SIZES_SETTINGS& aSizes )
{
m_sizes = aSizes;
if( !m_idle )
{
initPlacement();
Move( m_currentEnd, NULL );
}
}
bool PNS_DIFF_PAIR_PLACER::FixRoute( const VECTOR2I& aP, PNS_ITEM* aEndItem )
{
if( !m_fitOk )
return false;
if( m_currentTrace.CP().SegmentCount() < 1 ||
m_currentTrace.CN().SegmentCount() < 1 )
return false;
if( m_currentTrace.CP().SegmentCount() > 1 )
m_initialDiagonal = !DIRECTION_45( m_currentTrace.CP().CSegment( -2 ) ).IsDiagonal();
PNS_TOPOLOGY topo( m_lastNode );
if( !m_snapOnTarget && !m_currentTrace.EndsWithVias() )
{
SHAPE_LINE_CHAIN newP( m_currentTrace.CP() );
SHAPE_LINE_CHAIN newN( m_currentTrace.CN() );
if( newP.SegmentCount() > 1 && newN.SegmentCount() > 1 )
{
newP.Remove( -1, -1 );
newN.Remove( -1, -1 );
}
m_currentTrace.SetShape( newP, newN );
}
if( m_currentTrace.EndsWithVias() )
{
m_lastNode->Add( m_currentTrace.PLine().Via().Clone() );
m_lastNode->Add( m_currentTrace.NLine().Via().Clone() );
m_chainedPlacement = false;
}
else
{
m_chainedPlacement = !m_snapOnTarget;
}
PNS_LINE lineP( m_currentTrace.PLine() );
PNS_LINE lineN( m_currentTrace.NLine() );
m_lastNode->Add( &lineP );
m_lastNode->Add( &lineN );
topo.SimplifyLine( &lineP );
topo.SimplifyLine( &lineN );
m_prevPair = m_currentTrace.EndingPrimitives();
Router()->CommitRouting( m_lastNode );
m_lastNode = NULL;
m_placingVia = false;
if( m_snapOnTarget )
{
m_idle = true;
return true;
}
else
{
initPlacement();
return false;
}
}
void PNS_DIFF_PAIR_PLACER::GetModifiedNets( std::vector<int> &aNets ) const
{
aNets.push_back( m_netP );
aNets.push_back( m_netN );
}
void PNS_DIFF_PAIR_PLACER::updateLeadingRatLine()
{
SHAPE_LINE_CHAIN ratLineN, ratLineP;
PNS_TOPOLOGY topo( m_lastNode );
if( topo.LeadingRatLine( &m_currentTrace.PLine(), ratLineP ) )
{
Router()->DisplayDebugLine( ratLineP, 1, 10000 );
}
if( topo.LeadingRatLine ( &m_currentTrace.NLine(), ratLineN ) )
{
Router()->DisplayDebugLine( ratLineN, 3, 10000 );
}
}
const std::vector<int> PNS_DIFF_PAIR_PLACER::CurrentNets() const
{
std::vector<int> rv;
rv.push_back( m_netP );
rv.push_back( m_netN );
return rv;
}