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c391f9d9 | 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 | /////////////////////////////////////////////////////////////////////////////// | |
17 | // | |
18 | // This is a class for reading ITS SPD raw data files and providing | |
19 | // information about digits | |
20 | // | |
21 | /////////////////////////////////////////////////////////////////////////////// | |
22 | ||
23 | #include "AliITSRawStreamSPD.h" | |
42d20574 | 24 | #include "AliRawReader.h" |
c391f9d9 | 25 | |
26 | ClassImp(AliITSRawStreamSPD) | |
27 | ||
28 | ||
7941072e | 29 | AliITSRawStreamSPD::AliITSRawStreamSPD(AliRawReader* rawReader) : |
30 | AliITSRawStream(rawReader) | |
c391f9d9 | 31 | { |
32 | // create an object to read ITS SPD raw digits | |
33 | ||
7941072e | 34 | fRawReader->Select(1); |
c391f9d9 | 35 | } |
36 | ||
37 | ||
38 | Bool_t AliITSRawStreamSPD::Next() | |
39 | { | |
40 | // read the next raw digit | |
41 | // returns kFALSE if there is no digit left | |
42 | ||
43 | fPrevModuleID = fModuleID; | |
7941072e | 44 | while (fRawReader->ReadNextShort(fData)) { |
c391f9d9 | 45 | |
46 | if ((fData & 0xE000) == 0x6000) { // header | |
47 | fHitCount = 0; | |
48 | UShort_t halfStave = (fData >> 4) & 0x007F; | |
49 | UShort_t chipAddr = fData & 0x000F; | |
50 | fModuleID = 2 * halfStave; | |
51 | if (chipAddr >= 5) fModuleID++; | |
52 | fOffset = 32 * (chipAddr % 5); | |
53 | } else if ((fData & 0xE000) == 0x0000) { // trailer | |
54 | UShort_t hitCount = fData & 0x1FFF; | |
55 | if (hitCount != fHitCount) Error("Next", "wrong number of hits!"); | |
56 | } else if ((fData & 0xC000) == 0x8000) { // pixel hit | |
57 | fHitCount++; | |
58 | fCoord1 = (fData & 0x001F) + fOffset; | |
59 | fCoord2 = (fData >> 5) & 0x00FF; | |
60 | return kTRUE; | |
61 | } else { // fill word | |
62 | if (fData != 0xFEDC) Error("Next", "wrong fill word!"); | |
63 | } | |
64 | ||
65 | } | |
66 | ||
67 | return kFALSE; | |
68 | } |