CMS 3D CMS Logo

SiPixelDbItem Class Reference

#include <CondFormats/SiPixelObjects/interface/SiPixelDbItem.h>

List of all members.

Public Member Functions

float gain ()
short noise ()
PackedPixDbType packedValue ()
short pedestal ()
void set (short noise, short pedestal, float gain, char status)
 A fast version which sets all in one go.
void setGain (float g)
void setNoise (short n)
 The logic of individual setters: First, we put the new value into newXXX, which is a 32-bit word which has the new value at the bits where it should go, and 0's everywhere else.
void setPackedVal (PackedPixDbType p)
void setPedestal (short p)
void setStatus (char s)
 SiPixelDbItem ()
char status ()
 ~SiPixelDbItem ()

Private Types

typedef uint32_t PackedPixDbType

Private Attributes

PackedPixDbType packedVal_

Static Private Attributes

static Packing packing_

Classes

class  Packing
 Pack the pixel information to use less memory. More...

Detailed Description

Definition at line 20 of file SiPixelDbItem.h.

Member Typedef Documentation

typedef uint32_t SiPixelDbItem::PackedPixDbType [private]

Definition at line 22 of file SiPixelDbItem.h.

Constructor & Destructor Documentation

SiPixelDbItem::SiPixelDbItem (  )  [inline]

Definition at line 25 of file SiPixelDbItem.h.

00025 : packedVal_(0) { set(2, 0, 1.0, 0); }  // TO DO: is noise==2 in shifted rep or not???

SiPixelDbItem::~SiPixelDbItem (  )  [inline]

Definition at line 26 of file SiPixelDbItem.h.

00026 {}

Member Function Documentation

float SiPixelDbItem::gain (  )  [inline]

Definition at line 29 of file SiPixelDbItem.h.

References SiPixelDbItem::Packing::gain_mask, SiPixelDbItem::Packing::gain_shift, packedVal_, and packing_.

00029 { return (packedVal_ >> packing_.gain_shift     ) & packing_.gain_mask    ; }

short SiPixelDbItem::noise (  )  [inline]

Definition at line 27 of file SiPixelDbItem.h.

References SiPixelDbItem::Packing::noise_mask, SiPixelDbItem::Packing::noise_shift, packedVal_, and packing_.

00027 { return (packedVal_ >> packing_.noise_shift    ) & packing_.noise_mask   ; }

PackedPixDbType SiPixelDbItem::packedValue (  )  [inline]

Definition at line 31 of file SiPixelDbItem.h.

References packedVal_.

00031 { return packedVal_; }

short SiPixelDbItem::pedestal (  )  [inline]

Definition at line 28 of file SiPixelDbItem.h.

References packedVal_, packing_, SiPixelDbItem::Packing::pedestal_mask, and SiPixelDbItem::Packing::pedestal_shift.

00028 { return (packedVal_ >> packing_.pedestal_shift ) & packing_.pedestal_mask; }

void SiPixelDbItem::set ( short  noise,
short  pedestal,
float  gain,
char  status 
)

A fast version which sets all in one go.

Definition at line 63 of file SiPixelDbItem.cc.

References SiPixelDbItem::Packing::gain_shift, int, SiPixelDbItem::Packing::noise_shift, packedVal_, packing_, SiPixelDbItem::Packing::pedestal_shift, and SiPixelDbItem::Packing::status_shift.

00064 {
00065   // Convert gain into a shifted-integer
00066   int mult_factor = 1 << packing_.gain_shift;   // TO DO: check usage here
00067   unsigned short gInIntRep = int( gain * mult_factor );
00068 
00069   packedVal_ = 
00070     (noise     << packing_.noise_shift)     | 
00071     (pedestal  << packing_.pedestal_shift)  | 
00072     (gInIntRep << packing_.gain_shift)      |
00073     (status    << packing_.status_shift);
00074 }

void SiPixelDbItem::setGain ( float  g  ) 

Definition at line 42 of file SiPixelDbItem.cc.

References SiPixelDbItem::Packing::gain_mask, SiPixelDbItem::Packing::gain_shift, int, packedVal_, and packing_.

00043 {
00044   // Convert gain into a shifted-integer
00045   int mult_factor = 1 << packing_.gain_shift;   // TO DO: check
00046   unsigned short gInIntRep = int( g * mult_factor );
00047 
00048   PackedPixDbType newGain = (gInIntRep & packing_.gain_mask) << packing_.gain_shift;
00049   PackedPixDbType oldValue = packedVal_ & ( ~(packing_.gain_mask << packing_.gain_shift) );
00050   packedVal_ = oldValue | newGain;
00051 }

void SiPixelDbItem::setNoise ( short  n  ) 

The logic of individual setters: First, we put the new value into newXXX, which is a 32-bit word which has the new value at the bits where it should go, and 0's everywhere else.

To make it, we:

Next, we prepare the oldValue with a whole where newXXX needs to go. ~(mask << shift) has 1's everywhere except where the new value will go, so AND-ing packedVal_ with it creates a `whole' for the new value.

Finally, the new value is an OR of the two (since the wholes have 0's)

Example: 00 03 c3 02 -- old, new one must blow c3 away, so we AND with ff ff 00 ff, and get 00 03 00 02. The new number is now positioned to be ff ff a2 ff, and then we AND these two and get 00 03 a2 02. We have replaced c3 with a2.

Definition at line 28 of file SiPixelDbItem.cc.

References SiPixelDbItem::Packing::noise_mask, SiPixelDbItem::Packing::noise_shift, packedVal_, and packing_.

00029 {
00030   PackedPixDbType newNoise = (n & packing_.noise_mask) << packing_.noise_shift;
00031   PackedPixDbType oldValue = packedVal_ & ( ~(packing_.noise_mask << packing_.noise_shift) );
00032   packedVal_ = oldValue | newNoise;
00033 }

void SiPixelDbItem::setPackedVal ( PackedPixDbType  p  )  [inline]

Definition at line 33 of file SiPixelDbItem.h.

References packedVal_.

00033 { packedVal_ = p; }

void SiPixelDbItem::setPedestal ( short  p  ) 

Definition at line 35 of file SiPixelDbItem.cc.

References packedVal_, packing_, SiPixelDbItem::Packing::pedestal_mask, and SiPixelDbItem::Packing::pedestal_shift.

00036 {
00037   PackedPixDbType newPedestal = (p & packing_.pedestal_mask) << packing_.pedestal_shift;
00038   PackedPixDbType oldValue = packedVal_ & ( ~(packing_.pedestal_mask << packing_.pedestal_shift) );
00039   packedVal_ = oldValue | newPedestal;
00040 }

void SiPixelDbItem::setStatus ( char  s  ) 

Definition at line 53 of file SiPixelDbItem.cc.

References packedVal_, packing_, SiPixelDbItem::Packing::status_mask, and SiPixelDbItem::Packing::status_shift.

00054 {
00055   PackedPixDbType newStatus = (s & packing_.status_mask) << packing_.status_shift;
00056   PackedPixDbType oldValue = packedVal_ & ( ~(packing_.status_mask << packing_.status_shift) );
00057   packedVal_ = oldValue | newStatus;
00058 }

char SiPixelDbItem::status (  )  [inline]

Definition at line 30 of file SiPixelDbItem.h.

References packedVal_, packing_, SiPixelDbItem::Packing::status_mask, and SiPixelDbItem::Packing::status_shift.

00030 { return (packedVal_ >> packing_.status_shift   ) & packing_.status_mask  ; }

Member Data Documentation

PackedPixDbType SiPixelDbItem::packedVal_ [private]

Definition at line 44 of file SiPixelDbItem.h.

Referenced by gain(), noise(), packedValue(), pedestal(), set(), setGain(), setNoise(), setPackedVal(), setPedestal(), setStatus(), and status().

SiPixelDbItem::Packing SiPixelDbItem::packing_ [static, private]

Definition at line 66 of file SiPixelDbItem.h.

Referenced by gain(), noise(), pedestal(), set(), setGain(), setNoise(), setPedestal(), setStatus(), and status().

The documentation for this class was generated from the following files:
Generated on Tue Jun 9 18:31:54 2009 for CMSSW by  doxygen 1.5.4