[u/mrichter/AliRoot.git] / FMD / AliFMDAltroMapping.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.                  *
 **************************************************************************/
/* $Id$ */
/** @file    AliFMDAltroMapping.cxx
    @author  Christian Holm Christensen <cholm@nbi.dk>
    @date    Sun Mar 26 18:27:56 2006
    @brief   Map HW to detector 
*/
//____________________________________________________________________
//                                                                          
// Mapping of ALTRO hardware channel to detector coordinates 
//
// The hardware address consist of a DDL number and 12bits of ALTRO
// addresses.  The ALTRO address are formatted as follows. 
//
//    12              7         4            0
//    |---------------|---------|------------|
//    | Board #       | ALTRO # | Channel #  |
//    +---------------+---------+------------+
//
// The mapping is done purely by calculations.  In the future,
// however, we may need some hard-coded stuff, or an external file to
// read from.  
//
#include "AliFMDAltroMapping.h"		// ALIFMDALTROMAPPING_H
#include "AliFMDParameters.h"
#include "AliLog.h"

//____________________________________________________________________
ClassImp(AliFMDAltroMapping)
#if 0
  ; // This is here to keep Emacs for indenting the next line
#endif

//_____________________________________________________________________________
AliFMDAltroMapping::AliFMDAltroMapping()
{
  // Constructor 
}


//_____________________________________________________________________________
Bool_t
AliFMDAltroMapping::ReadMapping()
{
  // Read map from file - not used
  return kTRUE;
}

//_____________________________________________________________________________
void
AliFMDAltroMapping::DeleteMappingArrays()
{
  // Clear map in memory 
}

//____________________________________________________________________
Bool_t 
AliFMDAltroMapping::Hardware2Detector(UInt_t    ddl, UInt_t    addr, 
				      UShort_t& det, Char_t&   ring, 
				      UShort_t& sec, UShort_t& str) const
{
  // Translate a hardware address to detector coordinates. 
  // The detector is simply 
  // 
  //    ddl + 1
  // 
  // The ring number, sector, and strip number is given by the addr
  // argument.  The address argument, has the following format 
  // 
  //   12            7          4          0
  //   +-------------+----------+----------+
  //   | Board       | ALTRO    | Channel  |
  //   +-------------+----------+----------+
  // 
  // The board number identifier among other things the ring.  There's
  // up to 4 boards per DDL, and the two first (0 and 16) corresponds
  // to the inner rings, while the two last (1 and 17) corresponds to
  // the outer rings. 
  // 
  // The board number and ALTRO number together identifies the sensor,
  // and hence.  The lower board number (0 or 2) are the first N / 2
  // sensors (where N is the number of sensors in the ring).  
  // 
  // There are 3 ALTRO's per card, and each ALTRO serves up to 4
  // sensors.  Which of sensor is determined by the channel number.
  // For the inner rings, the map is
  // 
  //    ALTRO 0, Channel  0 to  7   -> Sensor 0 or 5
  //    ALTRO 0, Channel  8 to 15   -> Sensor 1 or 6
  //    ALTRO 1, Channel  0 to  7   -> Sensor 2 or 7 
  //    ALTRO 2, Channel  0 to  7   -> Sensor 3 or 8
  //    ALTRO 2, Channel  8 to 15   -> Sensor 4 or 9
  // 
  // For the outer rings, the map is 
  // 
  //    ALTRO 0, Channel  0 to  3   -> Sensor 0 or 10
  //    ALTRO 0, Channel  4 to  7   -> Sensor 1 or 11
  //    ALTRO 0, Channel  8 to 11   -> Sensor 2 or 12
  //    ALTRO 0, Channel 12 to 15   -> Sensor 3 or 13
  //    ALTRO 1, Channel  0 to  3   -> Sensor 4 or 14
  //    ALTRO 1, Channel  4 to  7   -> Sensor 5 or 15
  //    ALTRO 2, Channel  0 to  3   -> Sensor 6 or 16
  //    ALTRO 2, Channel  4 to  7   -> Sensor 7 or 17
  //    ALTRO 2, Channel  8 to 11   -> Sensor 8 or 18
  //    ALTRO 2, Channel 12 to 15   -> Sensor 9 or 19
  // 
  // Which divison of the sensor we're in, depends on the channel
  // number only.  For the inner rings, the map is 
  // 
  //    Channel 0                   -> Sector 0, strips   0-127
  //    Channel 1                   -> Sector 1, strips   0-127
  //    Channel 3                   -> Sector 0, strips 128-255
  //    Channel 4                   -> Sector 1, strips 128-255
  //    Channel 5                   -> Sector 0, strips 256-383
  //    Channel 6                   -> Sector 1, strips 256-383
  //    Channel 7                   -> Sector 0, strips 384-511
  //    Channel 8                   -> Sector 1, strips 384-511 
  // 
  // There are only half as many strips in the outer sensors, so there
  // only 4 channels are used for a full sensor.  The map is 
  // 
  //    Channel 0                   -> Sector 0, strips   0-127
  //    Channel 1                   -> Sector 1, strips   0-127
  //    Channel 3                   -> Sector 0, strips 128-255
  //    Channel 4                   -> Sector 1, strips 128-255
  // 
  // With this information, we can decode the hardware address to give
  // us detector coordinates, unique at least up a 128 strips.  We
  // return the first strip in the given range. 
  //
  det          =  ddl + 1;
  UInt_t board =  (addr >> 7) & 0x1F;
  UInt_t altro =  (addr >> 4) & 0x7;
  UInt_t chan  =  (addr & 0xf);
  ring         =  (board % 2) == 0 ? 'I' : 'O';
  switch (ring) {
  case 'i':
  case 'I':
    sec = ((board / 16) * 10 + (altro < 1 ? 0 : altro < 2 ? 4 : 6) 
	   + 2 * (chan / 8) + chan % 2);
    str = ((chan % 8) / 2) * 128;
    break;
  case 'o':
  case 'O': 
    sec = ((board / 16) * 20 + (altro < 1 ? 0 : altro < 2 ? 8 : 12) 
	   + 2 * (chan / 4) + chan % 2);
    str = ((chan % 4) / 2) * 128;
    break;
  }
  return kTRUE;
}

//____________________________________________________________________
Bool_t 
AliFMDAltroMapping::Detector2Hardware(UShort_t  det, Char_t    ring, 
				      UShort_t  sec, UShort_t  str,
				      UInt_t&   ddl, UInt_t&   addr) const
{
  // Translate detector coordinates to a hardware address.
  // The ddl is simply 
  // 
  //    (det - 1)
  // 
  // The ring number, sector, and strip number must be encoded into a
  // hardware address.  The address argument, will have the following
  // format on output
  // 
  //   12            7          4          0
  //   +-------------+----------+----------+
  //   | Board       | ALTRO    | Channel  |
  //   +-------------+----------+----------+
  // 
  // The board number is given by the ring and sector.  The inner
  // rings board 0 and 16, while the outer are 1 and 17.  Which of these
  // depends on the sector.  The map is 
  // 
  //    Ring I, sector  0- 9       ->   board 0 
  //    Ring I, sector 10-19       ->   board 16
  //    Ring O, sector  0-19       ->   board 1 
  //    Ring O, sector 20-39       ->   board 17
  // 
  // There are 3 ALTRO's per board.  The ALTRO number is given by the
  // sector number.  For the inner rings, these are given by
  // 
  //    Sector  0- 3  or  10-13    ->   ALTRO 0 
  //    Sector  4- 5  or  14-15    ->   ALTRO 1 
  //    Sector  6- 9  or  16-19    ->   ALTRO 2 
  // 
  // For the outers, it's given by 
  // 
  //    Sector  0- 7  or  20-27    ->   ALTRO 0 
  //    Sector  8-11  or  28-31    ->   ALTRO 1 
  //    Sector 12-19  or  32-39    ->   ALTRO 2 
  //
  // The channel number is given by the sector and strip number.  For
  // the inners, the map is 
  // 
  //    Sector  0, strips   0-127  ->   Channel  0
  //    Sector  0, strips 128-255  ->   Channel  2
  //    Sector  0, strips 256-383  ->   Channel  4
  //    Sector  0, strips 384-511  ->   Channel  6
  //    Sector  1, strips   0-127  ->   Channel  1
  //    Sector  1, strips 128-255  ->   Channel  3
  //    Sector  1, strips 256-383  ->   Channel  5
  //    Sector  1, strips 384-511  ->   Channel  7
  //    Sector  2, strips   0-127  ->   Channel  8
  //    Sector  2, strips 128-255  ->   Channel 10
  //    Sector  2, strips 256-383  ->   Channel 12
  //    Sector  2, strips 384-511  ->   Channel 14
  //    Sector  3, strips   0-127  ->   Channel  9
  //    Sector  3, strips 128-255  ->   Channel 11
  //    Sector  3, strips 256-383  ->   Channel 13
  //    Sector  3, strips 384-511  ->   Channel 15
  // 
  // and so on, up to sector 19.  For the outer, the map is 
  // 
  //    Sector  0, strips   0-127  ->   Channel  0
  //    Sector  0, strips 128-255  ->   Channel  2
  //    Sector  1, strips   0-127  ->   Channel  1
  //    Sector  1, strips 128-255  ->   Channel  3
  //    Sector  2, strips   0-127  ->   Channel  4
  //    Sector  2, strips 128-255  ->   Channel  6
  //    Sector  3, strips   0-127  ->   Channel  5
  //    Sector  3, strips 128-255  ->   Channel  7
  //    Sector  4, strips   0-127  ->   Channel  8
  //    Sector  4, strips 128-255  ->   Channel 10
  //    Sector  5, strips   0-127  ->   Channel  9
  //    Sector  5, strips 128-255  ->   Channel 11
  //    Sector  6, strips   0-127  ->   Channel 12
  //    Sector  6, strips 128-255  ->   Channel 14
  //    Sector  7, strips   0-127  ->   Channel 13
  //    Sector  7, strips 128-255  ->   Channel 15
  // 
  // and so on upto sector 40. 
  // 
  // With this information, we can decode the detector coordinates to
  // give us a unique hardware address 
  //
  ddl          =  (det - 1);
  UInt_t board = 0;
  UInt_t altro = 0;
  UInt_t chan  = 0;
  UInt_t tmp   = 0;
  switch (ring) {
  case 'I':
  case 'i':
    board += (sec / 10) * 16;
    altro =  (sec % 10) < 4 ? 0 : (sec % 10) < 6 ? 1 : 2;
    tmp   =  (sec % 10) - (altro == 0 ? 0 : altro == 1 ? 4 : 6);
    chan  =  2  * (str / 128) + (sec % 2) + ((tmp / 2) % 2) * 8;
    break;
  case 'O':
  case 'o':
    board += (sec / 20) * 20 + 1;
    altro =  (sec % 20) < 8 ? 0 : (sec % 20) < 12 ? 1 : 2;
    tmp   =  (sec % 20) - (altro == 0 ? 0 : altro == 1 ? 8 : 12);
    chan  =  2 * (str / 128) + (sec % 2) + ((tmp / 2) % 4) * 4;
    break;
  }
  addr         =  chan + (altro << 4) + (board << 7);
  
  return kTRUE;
}

//____________________________________________________________________
Int_t
AliFMDAltroMapping::GetHWAddress(Int_t sec, Int_t str, Int_t ring) const
{
  // Return hardware address corresponding to sector sec, strip str,
  // and ring ring.   Mapping from TPC to FMD coordinates are 
  // 
  //   TPC     | FMD
  //   --------+------
  //   padrow  | sector
  //   pad     | strip
  //   sector  | ring 
  //
  UInt_t ddl, hwaddr;
  Char_t r = Char_t(ring);
  if (!Detector2Hardware(1, r, sec, str, ddl, hwaddr)) 
    return -1;
  return hwaddr;
}

//____________________________________________________________________
Int_t
AliFMDAltroMapping::GetPadRow(Int_t hwaddr) const
{
  // Return sector corresponding to hardware address hwaddr.  Mapping
  // from TPC to FMD coordinates are  
  // 
  //   TPC     | FMD
  //   --------+------
  //   padrow  | sector
  //   pad     | strip
  //   sector  | ring 
  //
  UShort_t det;
  Char_t   ring;
  UShort_t sec;
  UShort_t str;
  Int_t    ddl = 0;
  if (!Hardware2Detector(ddl, hwaddr, det, ring, sec, str)) return -1;
  return Int_t(sec);
}

//____________________________________________________________________
Int_t
AliFMDAltroMapping::GetPad(Int_t hwaddr) const
{
  // Return strip corresponding to hardware address hwaddr.  Mapping
  // from TPC to FMD coordinates are  
  // 
  //   TPC     | FMD
  //   --------+------
  //   padrow  | sector
  //   pad     | strip
  //   sector  | ring 
  //
  UShort_t det;
  Char_t   ring;
  UShort_t sec;
  UShort_t str;
  Int_t    ddl = 0;
  if (!Hardware2Detector(ddl, hwaddr, det, ring, sec, str)) return -1;
  return Int_t(str);
}
  
//____________________________________________________________________
Int_t
AliFMDAltroMapping::GetSector(Int_t hwaddr) const
{
  // Return ring corresponding to hardware address hwaddr.  Mapping
  // from TPC to FMD coordinates are  
  // 
  //   TPC     | FMD
  //   --------+------
  //   padrow  | sector
  //   pad     | strip
  //   sector  | ring 
  //
  UShort_t det;
  Char_t   ring;
  UShort_t sec;
  UShort_t str;
  Int_t    ddl = 0;
  if (!Hardware2Detector(ddl, hwaddr, det, ring, sec, str)) return -1;
  return Int_t(ring);
}

//_____________________________________________________________________________
//
// EOF
//
Commit	Line	Data
57c3c593	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	**************************************************************************/
57c3c593	15	/* $Id$ */
c2fc1258	16	/** @file AliFMDAltroMapping.cxx
	17	@author Christian Holm Christensen <cholm@nbi.dk>
	18	@date Sun Mar 26 18:27:56 2006
	19	@brief Map HW to detector
	20	*/
57c3c593	21	//____________________________________________________________________
	22	//
	23	// Mapping of ALTRO hardware channel to detector coordinates
	24	//
6169f936	25	// The hardware address consist of a DDL number and 12bits of ALTRO
6169f936	26	// addresses. The ALTRO address are formatted as follows.
02a27b50	27	//
	28	// 12 7 4 0
	29	// \|---------------\|---------\|------------\|
	30	// \| Board # \| ALTRO # \| Channel # \|
	31	// +---------------+---------+------------+
	32	//
6169f936	33	// The mapping is done purely by calculations. In the future,
	34	// however, we may need some hard-coded stuff, or an external file to
	35	// read from.
02a27b50	36	//
57c3c593	37	#include "AliFMDAltroMapping.h" // ALIFMDALTROMAPPING_H
	38	#include "AliFMDParameters.h"
	39	#include "AliLog.h"
	40
	41	//____________________________________________________________________
	42	ClassImp(AliFMDAltroMapping)
	43	#if 0
	44	; // This is here to keep Emacs for indenting the next line
	45	#endif
	46
	47	//_____________________________________________________________________________
	48	AliFMDAltroMapping::AliFMDAltroMapping()
9f662337	49	{
	50	// Constructor
	51	}
57c3c593	52
	53
	54	//_____________________________________________________________________________
	55	Bool_t
	56	AliFMDAltroMapping::ReadMapping()
	57	{
9f662337	58	// Read map from file - not used
57c3c593	59	return kTRUE;
	60	}
	61
	62	//_____________________________________________________________________________
	63	void
	64	AliFMDAltroMapping::DeleteMappingArrays()
9f662337	65	{
	66	// Clear map in memory
	67	}
57c3c593	68
	69	//____________________________________________________________________
	70	Bool_t
	71	AliFMDAltroMapping::Hardware2Detector(UInt_t ddl, UInt_t addr,
	72	UShort_t& det, Char_t& ring,
	73	UShort_t& sec, UShort_t& str) const
	74	{
	75	// Translate a hardware address to detector coordinates.
	76	// The detector is simply
	77	//
362c9d61	78	// ddl + 1
57c3c593	79	//
	80	// The ring number, sector, and strip number is given by the addr
	81	// argument. The address argument, has the following format
	82	//
	83	// 12 7 4 0
	84	// +-------------+----------+----------+
	85	// \| Board \| ALTRO \| Channel \|
	86	// +-------------+----------+----------+
	87	//
	88	// The board number identifier among other things the ring. There's
a9579262	89	// up to 4 boards per DDL, and the two first (0 and 16) corresponds
a9579262	90	// to the inner rings, while the two last (1 and 17) corresponds to
57c3c593	91	// the outer rings.
	92	//
	93	// The board number and ALTRO number together identifies the sensor,
	94	// and hence. The lower board number (0 or 2) are the first N / 2
	95	// sensors (where N is the number of sensors in the ring).
	96	//
	97	// There are 3 ALTRO's per card, and each ALTRO serves up to 4
	98	// sensors. Which of sensor is determined by the channel number.
	99	// For the inner rings, the map is
	100	//
	101	// ALTRO 0, Channel 0 to 7 -> Sensor 0 or 5
	102	// ALTRO 0, Channel 8 to 15 -> Sensor 1 or 6
	103	// ALTRO 1, Channel 0 to 7 -> Sensor 2 or 7
	104	// ALTRO 2, Channel 0 to 7 -> Sensor 3 or 8
	105	// ALTRO 2, Channel 8 to 15 -> Sensor 4 or 9
	106	//
	107	// For the outer rings, the map is
	108	//
	109	// ALTRO 0, Channel 0 to 3 -> Sensor 0 or 10
	110	// ALTRO 0, Channel 4 to 7 -> Sensor 1 or 11
	111	// ALTRO 0, Channel 8 to 11 -> Sensor 2 or 12
	112	// ALTRO 0, Channel 12 to 15 -> Sensor 3 or 13
	113	// ALTRO 1, Channel 0 to 3 -> Sensor 4 or 14
	114	// ALTRO 1, Channel 4 to 7 -> Sensor 5 or 15
	115	// ALTRO 2, Channel 0 to 3 -> Sensor 6 or 16
	116	// ALTRO 2, Channel 4 to 7 -> Sensor 7 or 17
	117	// ALTRO 2, Channel 8 to 11 -> Sensor 8 or 18
	118	// ALTRO 2, Channel 12 to 15 -> Sensor 9 or 19
	119	//
	120	// Which divison of the sensor we're in, depends on the channel
	121	// number only. For the inner rings, the map is
	122	//
	123	// Channel 0 -> Sector 0, strips 0-127
	124	// Channel 1 -> Sector 1, strips 0-127
	125	// Channel 3 -> Sector 0, strips 128-255
	126	// Channel 4 -> Sector 1, strips 128-255
	127	// Channel 5 -> Sector 0, strips 256-383
	128	// Channel 6 -> Sector 1, strips 256-383
	129	// Channel 7 -> Sector 0, strips 384-511
	130	// Channel 8 -> Sector 1, strips 384-511
	131	//
	132	// There are only half as many strips in the outer sensors, so there
	133	// only 4 channels are used for a full sensor. The map is
	134	//
	135	// Channel 0 -> Sector 0, strips 0-127
	136	// Channel 1 -> Sector 1, strips 0-127
	137	// Channel 3 -> Sector 0, strips 128-255
	138	// Channel 4 -> Sector 1, strips 128-255
	139	//
	140	// With this information, we can decode the hardware address to give
	141	// us detector coordinates, unique at least up a 128 strips. We
	142	// return the first strip in the given range.
	143	//
362c9d61	144	det = ddl + 1;
57c3c593	145	UInt_t board = (addr >> 7) & 0x1F;
	146	UInt_t altro = (addr >> 4) & 0x7;
	147	UInt_t chan = (addr & 0xf);
a9579262	148	ring = (board % 2) == 0 ? 'I' : 'O';
	149	switch (ring) {
	150	case 'i':
	151	case 'I':
	152	sec = ((board / 16) * 10 + (altro < 1 ? 0 : altro < 2 ? 4 : 6)
	153	+ 2 * (chan / 8) + chan % 2);
	154	str = ((chan % 8) / 2) * 128;
	155	break;
	156	case 'o':
	157	case 'O':
	158	sec = ((board / 16) * 20 + (altro < 1 ? 0 : altro < 2 ? 8 : 12)
	159	+ 2 * (chan / 4) + chan % 2);
	160	str = ((chan % 4) / 2) * 128;
	161	break;
57c3c593	162	}
57c3c593	163	return kTRUE;
	164	}
	165
	166	//____________________________________________________________________
	167	Bool_t
	168	AliFMDAltroMapping::Detector2Hardware(UShort_t det, Char_t ring,
	169	UShort_t sec, UShort_t str,
	170	UInt_t& ddl, UInt_t& addr) const
	171	{
	172	// Translate detector coordinates to a hardware address.
	173	// The ddl is simply
	174	//
362c9d61	175	// (det - 1)
57c3c593	176	//
	177	// The ring number, sector, and strip number must be encoded into a
	178	// hardware address. The address argument, will have the following
	179	// format on output
	180	//
	181	// 12 7 4 0
	182	// +-------------+----------+----------+
	183	// \| Board \| ALTRO \| Channel \|
	184	// +-------------+----------+----------+
	185	//
	186	// The board number is given by the ring and sector. The inner
a9579262	187	// rings board 0 and 16, while the outer are 1 and 17. Which of these
57c3c593	188	// depends on the sector. The map is
	189	//
	190	// Ring I, sector 0- 9 -> board 0
a9579262	191	// Ring I, sector 10-19 -> board 16
	192	// Ring O, sector 0-19 -> board 1
	193	// Ring O, sector 20-39 -> board 17
57c3c593	194	//
	195	// There are 3 ALTRO's per board. The ALTRO number is given by the
	196	// sector number. For the inner rings, these are given by
	197	//
	198	// Sector 0- 3 or 10-13 -> ALTRO 0
	199	// Sector 4- 5 or 14-15 -> ALTRO 1
	200	// Sector 6- 9 or 16-19 -> ALTRO 2
	201	//
	202	// For the outers, it's given by
	203	//
	204	// Sector 0- 7 or 20-27 -> ALTRO 0
	205	// Sector 8-11 or 28-31 -> ALTRO 1
	206	// Sector 12-19 or 32-39 -> ALTRO 2
	207	//
	208	// The channel number is given by the sector and strip number. For
	209	// the inners, the map is
	210	//
	211	// Sector 0, strips 0-127 -> Channel 0
	212	// Sector 0, strips 128-255 -> Channel 2
	213	// Sector 0, strips 256-383 -> Channel 4
	214	// Sector 0, strips 384-511 -> Channel 6
	215	// Sector 1, strips 0-127 -> Channel 1
	216	// Sector 1, strips 128-255 -> Channel 3
	217	// Sector 1, strips 256-383 -> Channel 5
	218	// Sector 1, strips 384-511 -> Channel 7
	219	// Sector 2, strips 0-127 -> Channel 8
	220	// Sector 2, strips 128-255 -> Channel 10
	221	// Sector 2, strips 256-383 -> Channel 12
	222	// Sector 2, strips 384-511 -> Channel 14
	223	// Sector 3, strips 0-127 -> Channel 9
	224	// Sector 3, strips 128-255 -> Channel 11
	225	// Sector 3, strips 256-383 -> Channel 13
	226	// Sector 3, strips 384-511 -> Channel 15
	227	//
	228	// and so on, up to sector 19. For the outer, the map is
	229	//
	230	// Sector 0, strips 0-127 -> Channel 0
	231	// Sector 0, strips 128-255 -> Channel 2
	232	// Sector 1, strips 0-127 -> Channel 1
	233	// Sector 1, strips 128-255 -> Channel 3
	234	// Sector 2, strips 0-127 -> Channel 4
	235	// Sector 2, strips 128-255 -> Channel 6
	236	// Sector 3, strips 0-127 -> Channel 5
	237	// Sector 3, strips 128-255 -> Channel 7
	238	// Sector 4, strips 0-127 -> Channel 8
	239	// Sector 4, strips 128-255 -> Channel 10
	240	// Sector 5, strips 0-127 -> Channel 9
	241	// Sector 5, strips 128-255 -> Channel 11
	242	// Sector 6, strips 0-127 -> Channel 12
	243	// Sector 6, strips 128-255 -> Channel 14
	244	// Sector 7, strips 0-127 -> Channel 13
	245	// Sector 7, strips 128-255 -> Channel 15
	246	//
	247	// and so on upto sector 40.
	248	//
	249	// With this information, we can decode the detector coordinates to
	250	// give us a unique hardware address
	251	//
362c9d61	252	ddl = (det - 1);
a9579262	253	UInt_t board = 0;
	254	UInt_t altro = 0;
	255	UInt_t chan = 0;
	256	UInt_t tmp = 0;
	257	switch (ring) {
	258	case 'I':
	259	case 'i':
	260	board += (sec / 10) * 16;
	261	altro = (sec % 10) < 4 ? 0 : (sec % 10) < 6 ? 1 : 2;
	262	tmp = (sec % 10) - (altro == 0 ? 0 : altro == 1 ? 4 : 6);
	263	chan = 2 * (str / 128) + (sec % 2) + ((tmp / 2) % 2) * 8;
	264	break;
	265	case 'O':
	266	case 'o':
	267	board += (sec / 20) * 20 + 1;
	268	altro = (sec % 20) < 8 ? 0 : (sec % 20) < 12 ? 1 : 2;
	269	tmp = (sec % 20) - (altro == 0 ? 0 : altro == 1 ? 8 : 12);
	270	chan = 2 * (str / 128) + (sec % 2) + ((tmp / 2) % 4) * 4;
	271	break;
	272	}
57c3c593	273	addr = chan + (altro << 4) + (board << 7);
	274
	275	return kTRUE;
	276	}
	277
	278	//____________________________________________________________________
	279	Int_t
	280	AliFMDAltroMapping::GetHWAddress(Int_t sec, Int_t str, Int_t ring) const
	281	{
	282	// Return hardware address corresponding to sector sec, strip str,
	283	// and ring ring. Mapping from TPC to FMD coordinates are
	284	//
	285	// TPC \| FMD
	286	// --------+------
	287	// padrow \| sector
	288	// pad \| strip
	289	// sector \| ring
	290	//
	291	UInt_t ddl, hwaddr;
	292	Char_t r = Char_t(ring);
	293	if (!Detector2Hardware(1, r, sec, str, ddl, hwaddr))
	294	return -1;
	295	return hwaddr;
	296	}
	297
	298	//____________________________________________________________________
	299	Int_t
	300	AliFMDAltroMapping::GetPadRow(Int_t hwaddr) const
	301	{
	302	// Return sector corresponding to hardware address hwaddr. Mapping
	303	// from TPC to FMD coordinates are
	304	//
	305	// TPC \| FMD
	306	// --------+------
	307	// padrow \| sector
	308	// pad \| strip
	309	// sector \| ring
	310	//
	311	UShort_t det;
	312	Char_t ring;
	313	UShort_t sec;
	314	UShort_t str;
362c9d61	315	Int_t ddl = 0;
57c3c593	316	if (!Hardware2Detector(ddl, hwaddr, det, ring, sec, str)) return -1;
	317	return Int_t(sec);
	318	}
	319
	320	//____________________________________________________________________
	321	Int_t
	322	AliFMDAltroMapping::GetPad(Int_t hwaddr) const
	323	{
	324	// Return strip corresponding to hardware address hwaddr. Mapping
	325	// from TPC to FMD coordinates are
	326	//
	327	// TPC \| FMD
	328	// --------+------
	329	// padrow \| sector
	330	// pad \| strip
	331	// sector \| ring
	332	//
	333	UShort_t det;
	334	Char_t ring;
	335	UShort_t sec;
	336	UShort_t str;
362c9d61	337	Int_t ddl = 0;
57c3c593	338	if (!Hardware2Detector(ddl, hwaddr, det, ring, sec, str)) return -1;
	339	return Int_t(str);
	340	}
	341
	342	//____________________________________________________________________
	343	Int_t
	344	AliFMDAltroMapping::GetSector(Int_t hwaddr) const
	345	{
	346	// Return ring corresponding to hardware address hwaddr. Mapping
	347	// from TPC to FMD coordinates are
	348	//
	349	// TPC \| FMD
	350	// --------+------
	351	// padrow \| sector
	352	// pad \| strip
	353	// sector \| ring
	354	//
	355	UShort_t det;
	356	Char_t ring;
	357	UShort_t sec;
	358	UShort_t str;
362c9d61	359	Int_t ddl = 0;
57c3c593	360	if (!Hardware2Detector(ddl, hwaddr, det, ring, sec, str)) return -1;
	361	return Int_t(ring);
	362	}
	363
	364	//_____________________________________________________________________________
	365	//
	366	// EOF
	367	//