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/data/refman/pasoursint/CMSSW_5_3_3/src/L1TriggerConfig/DTTPGConfig/src/DTConfigLUTs.cc

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00001 //-------------------------------------------------
00002 //
00003 //   Class: DTConfigLUTs
00004 //
00005 //   Description: Configurable parameters and constants 
00006 //   for Level1 Mu DT Trigger - LUTs
00007 //
00008 //
00009 //   Author List:
00010 //   S. Vanini
00011 //
00012 //-----------------------------------------------------------------------
00013 
00014 //-----------------------
00015 // This Class's Header --
00016 //-----------------------
00017 #include "L1TriggerConfig/DTTPGConfig/interface/DTConfigLUTs.h"
00018 
00019 //---------------
00020 // C++ Headers --
00021 //---------------
00022 #include <math.h> 
00023 #include <cstring>
00024 
00025 //-------------------------------
00026 // Collaborating Class Headers --
00027 //-------------------------------
00028 
00029 #include "FWCore/Utilities/interface/Exception.h"
00030 
00031 //----------------
00032 // Constructors --
00033 //----------------
00034 DTConfigLUTs::DTConfigLUTs(const edm::ParameterSet& ps) { 
00035   setDefaults(ps);
00036 }
00037 
00038 DTConfigLUTs::DTConfigLUTs(bool debugLUTS, unsigned short int * buffer) {
00039 
00040   m_debug = debugLUTS;
00041 
00042   // check if this is a LUT configuration string
00043   if (buffer[2]!=0xA8){
00044         throw cms::Exception("DTTPG") << "===> ConfigLUTs constructor : not a LUT string!" << std::endl;
00045   }
00046    
00047   // decode
00048   short int memory_lut[7];
00049   int c=3;
00050   for(int i=0;i<7;i++){
00051         memory_lut[i] = (buffer[c]<<8) | buffer[c+1];
00052         c += 2;
00053         //std::cout << hex << memory_bti[i] << "  ";
00054   }
00055 
00056   // decode
00057   int btic = memory_lut[0];
00058   float d;
00059   DSPtoIEEE32( memory_lut[1],  memory_lut[2], &d );
00060   float Xcn;     
00061   DSPtoIEEE32( memory_lut[3],  memory_lut[4], &Xcn );
00062   int wheel = memory_lut[5];
00063 
00064   // set parameters 
00065   setBTIC(btic);
00066   setD(d);
00067   setXCN(Xcn);
00068   setWHEEL(wheel);
00069   
00070   return; 
00071 }
00072 
00073 //--------------
00074 // Destructor --
00075 //--------------
00076 DTConfigLUTs::~DTConfigLUTs() {}
00077 
00078 //--------------
00079 // Operations --
00080 //--------------
00081 
00082 void
00083 DTConfigLUTs::setDefaults(const edm::ParameterSet& m_ps) {
00084 
00085   // Debug flag 
00086   m_debug = m_ps.getUntrackedParameter<bool>("Debug");
00087 
00088   // BTIC parameter
00089   m_btic = m_ps.getUntrackedParameter<int>("BTIC");
00090 
00091   // d: distance vertex to normal, unit cm. 
00092   m_d = m_ps.getUntrackedParameter<double>("D");
00093   
00094   // Xcn: distance vertex to normal, unit cm. 
00095   m_Xcn = m_ps.getUntrackedParameter<double>("XCN");
00096     
00097   // wheel sign (-1 or +1)
00098   m_wheel = m_ps.getUntrackedParameter<int>("WHEEL");
00099 }
00100 
00101 void 
00102 DTConfigLUTs::print() const {
00103 
00104   std::cout << "******************************************************************************" << std::endl;
00105   std::cout << "*              DTTrigger configuration : LUT parameters             *" << std::endl;
00106   std::cout << "******************************************************************************" << std::endl << std::endl;
00107   std::cout << "Debug flag : " <<  debug()     << std::endl;
00108   std::cout << "BTIC parameter : " << m_btic << std::endl;
00109   std::cout << "d: distance vertex to normal, unit cm. " << m_d << std::endl;
00110   std::cout << "Xcn: distance vertex to normal, unit cm. " << m_Xcn << std::endl;
00111   std::cout << "wheel sign " << m_wheel << std::endl;
00112   std::cout << "******************************************************************************" << std::endl;
00113 }
00114 
00115 void 
00116 DTConfigLUTs::DSPtoIEEE32(short DSPmantissa, short DSPexp, float *f)
00117 {
00118   DSPexp -= 15;
00119   *f = DSPmantissa * (float)pow( 2.0, DSPexp );
00120   return;
00121 }
00122 
00123 
00124 void
00125 DTConfigLUTs::IEEE32toDSP(float f, short int & DSPmantissa, short int & DSPexp)
00126 {
00127   long int *pl=0, lm;
00128   bool sign=false;
00129 
00130   DSPmantissa = 0;
00131   DSPexp = 0;
00132 
00133   if( f!=0.0 )
00134   {
00135         //pl = (long *)&f;
00136         memcpy(pl,&f,sizeof(float));
00137         if((*pl & 0x80000000)!=0)
00138                 sign=true;
00139         lm = ( 0x800000 | (*pl & 0x7FFFFF)); // [1][23bit mantissa]
00140         lm >>= 9; //reduce to 15bits
00141         lm &= 0x7FFF;
00142         DSPexp = ((*pl>>23)&0xFF)-126;
00143         DSPmantissa = (short)lm;
00144         if(sign)
00145                 DSPmantissa = - DSPmantissa;  // convert negative value in 2.s complement
00146 
00147   }
00148   return;
00149 }
00150 
00151 
00152 
00153