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[u/mrichter/AliRoot.git] / ITS / AliITSRawStreamSDDCompressed.cxx
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7765ca40 1/**************************************************************************
2 * Copyright(c) 2007-2009, ALICE Experiment at CERN, All rights reserved. *
3 * *
4 * Author: The ALICE Off-line Project. *
5 * Contributors are mentioned in the code where appropriate. *
6 * *
7 * Permission to use, copy, modify and distribute this software and its *
8 * documentation strictly for non-commercial purposes is hereby granted *
9 * without fee, provided that the above copyright notice appears in all *
10 * copies and that both the copyright notice and this permission notice *
11 * appear in the supporting documentation. The authors make no claims *
12 * about the suitability of this software for any purpose. It is *
13 * provided "as is" without express or implied warranty. *
14 **************************************************************************/
15
16/* $Id $*/
17
18///////////////////////////////////////////////////////////////////
19// //
20// Class to decode compressed SDD Raw Data format //
21// The 32 bits for a data word are defined as follows: //
22// 31 control bit (0=data word, 1= control word) //
23// 30 - //
24// 29 | //
25// 28 |-> 4 bits to identify the Carlos (0-11) inside the DDL //
26// 27 - //
27// 26 detecot side (0= left, =right) //
28// 25 - //
29// 24 | //
30// 23 | //
31// 22 | //
32// 21 |-> 8 bits to identify the anode number (0-255) //
33// 20 | //
34// 19 | //
35// 18 - //
36// 17 - //
37// 16 | //
38// 15 | //
39// 14 | //
40// 13 |-> 8 bits to identify the time bin (0-255) //
41// 12 | //
42// 11 | //
43// 10 - //
44// 9 - //
45// 8 | //
46// 7 | //
47// 6 | //
48// 5 | //
49// 4 |-> 10 bit for the ADC counts //
50// 3 | //
51// 2 | //
52// 1 | //
53// 0 - //
54// //
55// Plus 2 types of control words: //
de075dae 56// - Jitter word = 1000 //
7765ca40 57// - End of module data (needed by the Cluster Finder) = 1111 //
58// //
59// Origin: F.Prino, Torino, prino@to.infn.it //
60// //
61///////////////////////////////////////////////////////////////////
62
63
64
65#include "AliITSRawStreamSDDCompressed.h"
66#include "AliRawReader.h"
67#include "AliLog.h"
68
69ClassImp(AliITSRawStreamSDDCompressed)
70
71
72
73//______________________________________________________________________
74AliITSRawStreamSDDCompressed::AliITSRawStreamSDDCompressed(AliRawReader* rawReader) :
75 AliITSRawStream(rawReader),
294a1728 76 fDDLModuleMap(0),
77 fData(0),
78 fCarlosId(-1),
79 fChannel(0),
80 fJitter(0),
81 fDDL(0),
82 fADCEncoded(0)
7765ca40 83{
84// create an object to read ITS SDD raw digits
7765ca40 85 for(Int_t im=0;im<kSDDModules;im++){
86 fLowThresholdArray[im][0]=0;
87 fLowThresholdArray[im][1]=0;
88 }
89 fRawReader->Reset();
90 fRawReader->Select("ITSSDD");
91
92
93}
94
95//______________________________________________________________________
96AliITSRawStreamSDDCompressed::AliITSRawStreamSDDCompressed(const AliITSRawStreamSDDCompressed& rs) :
294a1728 97 AliITSRawStream(rs.fRawReader),
98 fDDLModuleMap(rs.fDDLModuleMap),
99 fData(0),
100 fCarlosId(-1),
101 fChannel(0),
102 fJitter(0),
103 fDDL(0),
104 fADCEncoded(0)
7765ca40 105{
106 // copy constructor
107 AliError("Copy constructor should not be used.");
108}
109//__________________________________________________________________________
110AliITSRawStreamSDDCompressed& AliITSRawStreamSDDCompressed::operator=(const AliITSRawStreamSDDCompressed& rs) {
111 // assignment operator
112 if (this!=&rs) {}
113 AliError("Assignment opertator should not be used.");
114 return *this;
115}
116
117//______________________________________________________________________
118AliITSRawStreamSDDCompressed::~AliITSRawStreamSDDCompressed(){
119 if(fDDLModuleMap) delete fDDLModuleMap;
120}
121
122
6297cc01 123//______________________________________________________________________
124Int_t AliITSRawStreamSDDCompressed::DecompAmbra(Int_t value) const
125{
126 // AMBRA decompression (from 8 to 10 bit)
127
128 if ((value & 0x80) == 0) {
129 return value & 0x7f;
130 } else if ((value & 0x40) == 0) {
0b4ad9b0 131 if(value&1) return 0x080 + ((value & 0x3f) << 1);
6297cc01 132 return 0x081 + ((value & 0x3f) << 1);
133 } else if ((value & 0x20) == 0) {
0b4ad9b0 134 if(value&1) return 0x103 + ((value & 0x1f) << 3);
6297cc01 135 return 0x104 + ((value & 0x1f) << 3);
136 } else {
0b4ad9b0 137 if(value&1) return 0x207 + ((value & 0x1f) << 4);
6297cc01 138 return 0x208 + ((value & 0x1f) << 4);
139 }
140
141}
7765ca40 142//______________________________________________________________________
143Bool_t AliITSRawStreamSDDCompressed::Next()
144{
145// read the next raw digit
146// returns kFALSE if there is no digit left
de075dae 147// returns kTRUE and fCompletedModule=kFALSE and fCompletedDDL=kFALSE when a digit is found
148// returns kTRUE and fCompletedModule=kTRUE and fCompletedDDL=kFALSE when a module is completed (=3x3FFFFFFF footer words)
149// returns kTRUE and fCompletedModule=kFALSE and fCompletedDDL=kTRUE when a DDL is completed (=jitter word)
7765ca40 150
f7bcb379 151
de075dae 152 UInt_t maskjit=8; // Jitter word has the 4 most significant bits = 1000
7765ca40 153 UInt_t maskeom=15; // end of module has the 4 most significant bits = 1111
154 UInt_t maskmod=15; // last 4 bits for module number in end of module word
f7bcb379 155 // UInt_t maskDDL=0xFF; // last 8 bits for DDL number in start of DDL word
156
7765ca40 157 UInt_t maskCarlos=15<<27; // 4 bits (27-30) for CarlosId in data word
158 UInt_t maskSide=1<<26; // 1 bit (26) for side in data word
159 UInt_t maskAnode=255<<18; // 8 bits (18-25) for Nanode in data word
160 UInt_t maskTb=255<<10; // 8 bits (10-27) for Ntimebin in data word
161 UInt_t maskADC=1023; // 10 bits (0-9) for ADC in data word
294a1728 162 UInt_t maskCode=7; // 3 bits (0-2) for ADC range in encoded-ADC case
f7bcb379 163
164 while(kTRUE){
f7bcb379 165 if (!fRawReader->ReadNextInt(fData)) return kFALSE; // read next word
166 UInt_t mostsigbits=fData>>28;
d9ed1779 167 if(fData==0xFFFFFFFF){
168 // CarlosRX header do nothing
169 } else if(mostsigbits==maskeom){
f7bcb379 170 fCarlosId=fData&maskmod;
cb6d8373 171 fDDL=fRawReader->GetDDLID();
f7bcb379 172 fModuleID = GetModuleNumber(fDDL,fCarlosId);
de075dae 173 fCompletedDDL=kFALSE;
f7bcb379 174 fCompletedModule=kTRUE;
175 return kTRUE;
de075dae 176 } else if(mostsigbits==maskjit){
177 fJitter = fData&0x000000ff;
178 fCompletedModule=kFALSE;
179 fCompletedDDL=kTRUE;
180 return kTRUE;
f7bcb379 181 }else{
182 fCarlosId=(fData&maskCarlos)>>27;
cb6d8373 183 fDDL=fRawReader->GetDDLID();
f7bcb379 184 fModuleID = GetModuleNumber(fDDL,fCarlosId);
185 fChannel=(fData&maskSide)>>26;
186 fCoord1=(fData&maskAnode)>>18;
187 fCoord2=(fData&maskTb)>>10;
294a1728 188 Int_t sig8bit;
189 if(fADCEncoded){
190 UInt_t code=fData&maskCode;
040d0012 191 if (code < 2 || code > 7) AliError(Form("Wrong ADC code value %d",code));
294a1728 192 UInt_t adcmask=(1<<code)-1;
193 sig8bit=((fData&(adcmask<<3))>>3) + (1<<code);
194 }else{
195 sig8bit=fData&maskADC;
196 }
6297cc01 197 sig8bit+=fLowThresholdArray[fModuleID-kSPDModules][fChannel];
198 fSignal=DecompAmbra(sig8bit);
f7bcb379 199 fCompletedModule=kFALSE;
de075dae 200 fCompletedDDL=kFALSE;
f7bcb379 201 return kTRUE;
202 }
7765ca40 203 }
204 return kFALSE;
205}
206
207