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2906f4c2 | 1 | /************************************************************************** |
2 | * Copyright(c) 1998-1999, 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 | /// This class provides access to ITS SPD digits in raw data. | |
21 | /// | |
22 | /////////////////////////////////////////////////////////////////////////////// | |
23 | ||
24 | #include "AliITSRawStreamSPD.h" | |
25 | #include "AliRawReader.h" | |
26 | ||
27 | ClassImp(AliITSRawStreamSPD) | |
28 | ||
29 | ||
30 | const Int_t AliITSRawStreamSPD::fgkDDLModuleMap[kDDLsNumber][kModulesPerDDL] = { | |
31 | { 0, 1, 4, 5, 80, 81, 84, 85, 88, 89, 92, 93}, | |
32 | { 2, 3, 6, 7, 82, 83, 86, 87, 90, 91, 94, 95}, | |
33 | { 8, 9,12,13, 96, 97,100,101,104,105,108,109}, | |
34 | {10,11,14,15, 98, 99,102,103,106,107,110,111}, | |
35 | {16,17,20,21,112,113,116,117,120,121,124,125}, | |
36 | {18,19,22,23,114,115,118,119,122,123,126,127}, | |
37 | {24,25,28,29,128,129,132,133,136,137,140,141}, | |
38 | {26,27,30,31,130,131,134,135,138,139,142,143}, | |
39 | {32,33,36,37,144,145,148,149,152,153,156,157}, | |
40 | {34,35,38,39,146,147,150,151,154,155,158,159}, | |
41 | {40,41,44,45,160,161,164,165,168,169,172,173}, | |
42 | {42,43,46,47,162,163,166,167,170,171,174,175}, | |
43 | {48,49,52,53,176,177,180,181,184,185,188,189}, | |
44 | {50,51,54,55,178,179,182,183,186,187,190,191}, | |
45 | {56,57,60,61,192,193,196,197,200,201,204,205}, | |
46 | {58,59,62,63,194,195,198,199,202,203,206,207}, | |
47 | {64,65,68,69,208,209,212,213,216,217,220,221}, | |
48 | {66,67,70,71,210,211,214,215,218,219,222,223}, | |
49 | {72,73,76,77,224,225,228,229,232,233,236,237}, | |
50 | {74,75,78,79,226,227,230,231,234,235,238,239} | |
51 | }; | |
52 | ||
53 | ||
54 | AliITSRawStreamSPD::AliITSRawStreamSPD(AliRawReader* rawReader) : | |
55 | AliITSRawStream(rawReader), | |
56 | fData(0), | |
57 | fDDLNumber(-1), | |
58 | fEventNumber(-1), | |
59 | fModuleNumber(-1), | |
60 | fOffset(0), | |
61 | fHitCount(0) | |
62 | { | |
63 | // create an object to read ITS SPD raw digits | |
64 | ||
362c9d61 | 65 | fRawReader->Select("ITSSPD"); |
2906f4c2 | 66 | } |
67 | ||
68 | ||
69 | Bool_t AliITSRawStreamSPD::Next() | |
70 | { | |
71 | // read the next raw digit | |
72 | // returns kFALSE if there is no digit left | |
73 | ||
74 | fPrevModuleID = fModuleID; | |
75 | while (fRawReader->ReadNextShort(fData)) { | |
76 | ||
77 | if ((fData & 0xC000) == 0x4000) { // header | |
78 | fHitCount = 0; | |
79 | UShort_t eventNumber = (fData >> 4) & 0x007F; | |
80 | if (fEventNumber < 0) { | |
81 | fEventNumber = eventNumber; | |
82 | } else if (eventNumber != fEventNumber) { | |
83 | Warning("Next", "mismatching event numbers: %d != %d", | |
84 | eventNumber, fEventNumber); | |
85 | } | |
86 | UShort_t chipAddr = fData & 0x000F; | |
87 | if (fRawReader->GetDDLID() != fDDLNumber) { | |
88 | fModuleNumber = -1; | |
89 | fDDLNumber = fRawReader->GetDDLID(); | |
90 | } | |
91 | if ((chipAddr == 5) || (chipAddr == 0)) { | |
92 | fModuleNumber++; | |
93 | while (fRawReader->TestBlockAttribute(fModuleNumber/2)) fModuleNumber++; | |
94 | } | |
95 | if (fDDLNumber < kDDLsNumber) { | |
96 | fModuleID = fgkDDLModuleMap[fDDLNumber][fModuleNumber]; | |
97 | } else { | |
98 | fModuleID = fModuleNumber; | |
99 | } | |
100 | fOffset = 32 * (chipAddr % 5); | |
101 | } else if ((fData & 0xC000) == 0x0000) { // trailer | |
102 | UShort_t hitCount = fData & 0x1FFF; | |
103 | if (hitCount != fHitCount) Error("Next", "wrong number of hits: %d != %d", fHitCount, hitCount); | |
104 | } else if ((fData & 0xC000) == 0x8000) { // pixel hit | |
105 | fHitCount++; | |
106 | fCoord1 = (fData & 0x001F) + fOffset; | |
107 | fCoord2 = (fData >> 5) & 0x00FF; | |
108 | return kTRUE; | |
109 | } else { // fill word | |
110 | if ((fData & 0xC000) != 0xC000) Error("Next", "wrong fill word!"); | |
111 | } | |
112 | ||
113 | } | |
114 | ||
115 | return kFALSE; | |
116 | } |