A level 1 calorimeter trigger conversion service: returns the Coordinate represented by a RoI word. More...

#include <JetEtRoIDecoder.h>

Collaboration diagram for LVL1::JetEtRoIDecoder:

Public Member Functions
	JetEtRoIDecoder ()
virtual	~JetEtRoIDecoder ()
unsigned int	energy (unsigned int roiWord) const
	returns a 4b number which represents the Jet Et energy in GeV

Private Member Functions
unsigned int	extractBits (unsigned int word, const unsigned int start, const unsigned int length) const
	returns the value of bits in word between bit "start" and bit "start" + "length"

Detailed Description

A level 1 calorimeter trigger conversion service: returns the Coordinate represented by a RoI word.

Author: E.Moyse

Todo: this should probably be a static class.

Definition at line 23 of file JetEtRoIDecoder.h.

Constructor & Destructor Documentation

◆ JetEtRoIDecoder()

LVL1::JetEtRoIDecoder::JetEtRoIDecoder ( )

Definition at line 19 of file JetEtRoIDecoder.cxx.

                                   {
 
  }

◆ ~JetEtRoIDecoder()

LVL1::JetEtRoIDecoder::~JetEtRoIDecoder ( )

virtual

Definition at line 23 of file JetEtRoIDecoder.cxx.

                                    {
 
  }

Member Function Documentation

◆ energy()

unsigned int LVL1::JetEtRoIDecoder::energy ( unsigned int roiWord ) const

returns a 4b number which represents the Jet Et energy in GeV

returns a 4b number which represents the thresholds passed

Definition at line 28 of file JetEtRoIDecoder.cxx.

                                                                   {
    return roiWord & 0xF;
  }

◆ extractBits()

unsigned int LVL1::JetEtRoIDecoder::extractBits	(	unsigned int	word,
		const unsigned int	start,
		const unsigned int	length ) const

private

returns the value of bits in word between bit "start" and bit "start" + "length"

Definition at line 33 of file JetEtRoIDecoder.cxx.

                                                                                                                          {
 
    // this works as follows. Imagine start=3, bits=4 and word=11011100
    // so this routine should return 0111
    // now:
    // word>>(first-1)  = 110111
    // (1<<length)      = 010000
    // (1<<length)-1    = 001111
    word = ( word >> ( start - 1 ) );
 
    unsigned int bitmask = ( 1 << length ) - 1;
    // and finally:
    // 110111&001111    = 0111
    return ( word & bitmask ); // return only bits in bitmask
  }

The documentation for this class was generated from the following files:

Public Member Functions