[u/mrichter/AliRoot.git] / ITS / AliITSRawStreamSPD.cxx

/**************************************************************************
 * Copyright(c) 1998-1999, ALICE Experiment at CERN, All rights reserved. *
 *                                                                        *
 * Author: The ALICE Off-line Project.                                    *
 * Contributors are mentioned in the code where appropriate.              *
 *                                                                        *
 * Permission to use, copy, modify and distribute this software and its   *
 * documentation strictly for non-commercial purposes is hereby granted   *
 * without fee, provided that the above copyright notice appears in all   *
 * copies and that both the copyright notice and this permission notice   *
 * appear in the supporting documentation. The authors make no claims     *
 * about the suitability of this software for any purpose. It is          *
 * provided "as is" without express or implied warranty.                  *
 **************************************************************************/

///////////////////////////////////////////////////////////////////////////////
//
// This is a class for reading ITS SPD raw data files and providing
// information about digits
//
///////////////////////////////////////////////////////////////////////////////

#include "AliITSRawStreamSPD.h"

ClassImp(AliITSRawStreamSPD)


AliITSRawStreamSPD::AliITSRawStreamSPD() : 
  fRawReader("SPDslice", kTRUE)
{
// create an object to read ITS SPD raw digits

}


Bool_t AliITSRawStreamSPD::Next()
{
// read the next raw digit
// returns kFALSE if there is no digit left

  fPrevModuleID = fModuleID;
  while (fRawReader.ReadNextShort(fData)) {
  
    if ((fData & 0xE000) == 0x6000) {           // header
      fHitCount = 0;
      UShort_t halfStave = (fData >> 4) & 0x007F;
      UShort_t chipAddr = fData & 0x000F;
      fModuleID = 2 * halfStave;
      if (chipAddr >= 5) fModuleID++;
      fOffset = 32 * (chipAddr % 5);
    } else if ((fData & 0xE000) == 0x0000) {    // trailer
      UShort_t hitCount = fData & 0x1FFF;
      if (hitCount != fHitCount) Error("Next", "wrong number of hits!");
    } else if ((fData & 0xC000) == 0x8000) {    // pixel hit
      fHitCount++;
      fCoord1 = (fData & 0x001F) + fOffset;
      fCoord2 = (fData >> 5) & 0x00FF;
      return kTRUE;
    } else {                                    // fill word
      if (fData != 0xFEDC) Error("Next", "wrong fill word!");
    }

  }

  return kFALSE;
}
Commit	Line	Data
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"
	24
	25	ClassImp(AliITSRawStreamSPD)
	26
	27
	28	AliITSRawStreamSPD::AliITSRawStreamSPD() :
	29	fRawReader("SPDslice", kTRUE)
	30	{
	31	// create an object to read ITS SPD raw digits
	32
	33	}
	34
	35
	36	Bool_t AliITSRawStreamSPD::Next()
	37	{
	38	// read the next raw digit
	39	// returns kFALSE if there is no digit left
	40
	41	fPrevModuleID = fModuleID;
	42	while (fRawReader.ReadNextShort(fData)) {
	43
	44	if ((fData & 0xE000) == 0x6000) { // header
	45	fHitCount = 0;
	46	UShort_t halfStave = (fData >> 4) & 0x007F;
	47	UShort_t chipAddr = fData & 0x000F;
	48	fModuleID = 2 * halfStave;
	49	if (chipAddr >= 5) fModuleID++;
	50	fOffset = 32 * (chipAddr % 5);
	51	} else if ((fData & 0xE000) == 0x0000) { // trailer
	52	UShort_t hitCount = fData & 0x1FFF;
	53	if (hitCount != fHitCount) Error("Next", "wrong number of hits!");
	54	} else if ((fData & 0xC000) == 0x8000) { // pixel hit
	55	fHitCount++;
	56	fCoord1 = (fData & 0x001F) + fOffset;
	57	fCoord2 = (fData >> 5) & 0x00FF;
	58	return kTRUE;
	59	} else { // fill word
	60	if (fData != 0xFEDC) Error("Next", "wrong fill word!");
	61	}
	62
	63	}
	64
65	return kFALSE;
66	}