[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 - kBaseDDL + 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 1) corresponds
  // to the inner rings, while the two last (2 and 3) 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 - AliFMDParameters::kBaseDDL) + 1;
  UInt_t board =  (addr >> 7) & 0x1F;
  UInt_t altro =  (addr >> 4) & 0x7;
  UInt_t chan  =  (addr & 0xf);
  if (board > 3) {
    AliError(Form("Invalid board address %d for the FMD", board));
    return kFALSE;
  }
  if (altro > 2) {
    AliError(Form("Invalid ALTRO address %d for the FMD digitizer %d", 
		  altro, board));
    return kFALSE;
  }
  ring         =  (board > 1 ? 'O' : 'I');
  UInt_t nsen  =  (ring == 'I' ? 10 : 20);
  UInt_t nsa   =  (ring == 'I' ? 2 : 4);   // Sensors per ALTRO
  UInt_t ncs   =  (ring == 'I' ? 8 : 4);   // Channels per sensor 
  UInt_t sen   =  (board % 2) * nsen / 2;  // Base for half-ring
  sen          += chan / ncs + (altro == 0 ? 0   : 
				altro == 1 ? nsa : UInt_t(1.5 * nsa));
  sec          =  2 * sen + (chan % 2);
  str          =  (chan % ncs) / 2 * 128;
  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 
  // 
  //    kBaseDDL + (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 1, while the outer are 2 and 3.  Which of these
  // depends on the sector.  The map is 
  // 
  //    Ring I, sector  0- 9       ->   board 0 
  //    Ring I, sector 10-19       ->   board 1
  //    Ring O, sector  0-19       ->   board 2 
  //    Ring O, sector 20-39       ->   board 3
  // 
  // 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          =  AliFMDParameters::kBaseDDL + (det - 1);
  UInt_t nsen  =  (ring == 'I' ? 10 : 20);
  UInt_t nsa   =  (ring == 'I' ? 2 : 4);   // Sensors per ALTRO
  UInt_t ncs   =  (ring == 'I' ? 8 : 4);   // Channels per sensor 
  UInt_t bbase =  (ring == 'I' ? 0 : 2);
  UInt_t board =  bbase + sec / nsen;
  UInt_t lsec  =  (sec - (board - bbase) * nsen); // Local sec in half-ring
  UInt_t altro =  (lsec < 2 * nsa ? 0 : (lsec < 3 * nsa ? 1       : 2));
  UInt_t sbase =  (altro == 0     ? 0 : altro == 1      ? 2 * nsa : 3 * nsa);
  UInt_t chan  =  (sec % 2) + (lsec-sbase) / 2 * ncs + 2 * (str / 128);
  AliDebug(40, Form("\n"
		    "  chan = (%d %% 2) + (%d-%d) / %d * %d + 2 * %d / 128\n"
		    "       = %d + %d + %d = %d", 
		    sec, lsec, sbase, 2, ncs, str, 
		    (sec % 2), (lsec - sbase) / 2 * ncs, 
		    2 * (str / 128), chan));
  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 = AliFMDParameters::kBaseDDL;
  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 = AliFMDParameters::kBaseDDL;
  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 = AliFMDParameters::kBaseDDL;
  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	//
	78	// ddl - kBaseDDL + 1
	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
	89	// up to 4 boards per DDL, and the two first (0 and 1) corresponds
	90	// to the inner rings, while the two last (2 and 3) corresponds to
	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	//
144	det = (ddl - AliFMDParameters::kBaseDDL) + 1;
145	UInt_t board = (addr >> 7) & 0x1F;
146	UInt_t altro = (addr >> 4) & 0x7;
147	UInt_t chan = (addr & 0xf);
148	if (board > 3) {
149	AliError(Form("Invalid board address %d for the FMD", board));
150	return kFALSE;
151	}
152	if (altro > 2) {
153	AliError(Form("Invalid ALTRO address %d for the FMD digitizer %d",
154	altro, board));
155	return kFALSE;
156	}
157	ring = (board > 1 ? 'O' : 'I');
158	UInt_t nsen = (ring == 'I' ? 10 : 20);
159	UInt_t nsa = (ring == 'I' ? 2 : 4); // Sensors per ALTRO
160	UInt_t ncs = (ring == 'I' ? 8 : 4); // Channels per sensor
161	UInt_t sen = (board % 2) * nsen / 2; // Base for half-ring
162	sen += chan / ncs + (altro == 0 ? 0 :
163	altro == 1 ? nsa : UInt_t(1.5 * nsa));
164	sec = 2 * sen + (chan % 2);
165	str = (chan % ncs) / 2 * 128;
166	return kTRUE;
167	}
168
169	//____________________________________________________________________
170	Bool_t
171	AliFMDAltroMapping::Detector2Hardware(UShort_t det, Char_t ring,
172	UShort_t sec, UShort_t str,
173	UInt_t& ddl, UInt_t& addr) const
174	{
175	// Translate detector coordinates to a hardware address.
176	// The ddl is simply
177	//
178	// kBaseDDL + (det - 1)
179	//
180	// The ring number, sector, and strip number must be encoded into a
181	// hardware address. The address argument, will have the following
182	// format on output
183	//
184	// 12 7 4 0
185	// +-------------+----------+----------+
186	// \| Board \| ALTRO \| Channel \|
187	// +-------------+----------+----------+
188	//
189	// The board number is given by the ring and sector. The inner
190	// rings board 0 and 1, while the outer are 2 and 3. Which of these
191	// depends on the sector. The map is
192	//
193	// Ring I, sector 0- 9 -> board 0
194	// Ring I, sector 10-19 -> board 1
195	// Ring O, sector 0-19 -> board 2
196	// Ring O, sector 20-39 -> board 3
197	//
198	// There are 3 ALTRO's per board. The ALTRO number is given by the
199	// sector number. For the inner rings, these are given by
200	//
201	// Sector 0- 3 or 10-13 -> ALTRO 0
202	// Sector 4- 5 or 14-15 -> ALTRO 1
203	// Sector 6- 9 or 16-19 -> ALTRO 2
204	//
205	// For the outers, it's given by
206	//
207	// Sector 0- 7 or 20-27 -> ALTRO 0
208	// Sector 8-11 or 28-31 -> ALTRO 1
209	// Sector 12-19 or 32-39 -> ALTRO 2
210	//
211	// The channel number is given by the sector and strip number. For
212	// the inners, the map is
213	//
214	// Sector 0, strips 0-127 -> Channel 0
215	// Sector 0, strips 128-255 -> Channel 2
216	// Sector 0, strips 256-383 -> Channel 4
217	// Sector 0, strips 384-511 -> Channel 6
218	// Sector 1, strips 0-127 -> Channel 1
219	// Sector 1, strips 128-255 -> Channel 3
220	// Sector 1, strips 256-383 -> Channel 5
221	// Sector 1, strips 384-511 -> Channel 7
222	// Sector 2, strips 0-127 -> Channel 8
223	// Sector 2, strips 128-255 -> Channel 10
224	// Sector 2, strips 256-383 -> Channel 12
225	// Sector 2, strips 384-511 -> Channel 14
226	// Sector 3, strips 0-127 -> Channel 9
227	// Sector 3, strips 128-255 -> Channel 11
228	// Sector 3, strips 256-383 -> Channel 13
229	// Sector 3, strips 384-511 -> Channel 15
230	//
231	// and so on, up to sector 19. For the outer, the map is
232	//
233	// Sector 0, strips 0-127 -> Channel 0
234	// Sector 0, strips 128-255 -> Channel 2
235	// Sector 1, strips 0-127 -> Channel 1
236	// Sector 1, strips 128-255 -> Channel 3
237	// Sector 2, strips 0-127 -> Channel 4
238	// Sector 2, strips 128-255 -> Channel 6
239	// Sector 3, strips 0-127 -> Channel 5
240	// Sector 3, strips 128-255 -> Channel 7
241	// Sector 4, strips 0-127 -> Channel 8
242	// Sector 4, strips 128-255 -> Channel 10
243	// Sector 5, strips 0-127 -> Channel 9
244	// Sector 5, strips 128-255 -> Channel 11
245	// Sector 6, strips 0-127 -> Channel 12
246	// Sector 6, strips 128-255 -> Channel 14
247	// Sector 7, strips 0-127 -> Channel 13
248	// Sector 7, strips 128-255 -> Channel 15
249	//
250	// and so on upto sector 40.
251	//
252	// With this information, we can decode the detector coordinates to
253	// give us a unique hardware address
254	//
255	ddl = AliFMDParameters::kBaseDDL + (det - 1);
256	UInt_t nsen = (ring == 'I' ? 10 : 20);
257	UInt_t nsa = (ring == 'I' ? 2 : 4); // Sensors per ALTRO
258	UInt_t ncs = (ring == 'I' ? 8 : 4); // Channels per sensor
259	UInt_t bbase = (ring == 'I' ? 0 : 2);
260	UInt_t board = bbase + sec / nsen;
1e8f773e	261	UInt_t lsec = (sec - (board - bbase) * nsen); // Local sec in half-ring
	262	UInt_t altro = (lsec < 2 * nsa ? 0 : (lsec < 3 * nsa ? 1 : 2));
	263	UInt_t sbase = (altro == 0 ? 0 : altro == 1 ? 2 * nsa : 3 * nsa);
	264	UInt_t chan = (sec % 2) + (lsec-sbase) / 2 * ncs + 2 * (str / 128);
57c3c593	265	AliDebug(40, Form("\n"
	266	" chan = (%d %% 2) + (%d-%d) / %d * %d + 2 * %d / 128\n"
	267	" = %d + %d + %d = %d",
1e8f773e	268	sec, lsec, sbase, 2, ncs, str,
	269	(sec % 2), (lsec - sbase) / 2 * ncs,
	270	2 * (str / 128), chan));
57c3c593	271	addr = chan + (altro << 4) + (board << 7);
	272
	273	return kTRUE;
	274	}
	275
	276	//____________________________________________________________________
	277	Int_t
	278	AliFMDAltroMapping::GetHWAddress(Int_t sec, Int_t str, Int_t ring) const
	279	{
	280	// Return hardware address corresponding to sector sec, strip str,
	281	// and ring ring. Mapping from TPC to FMD coordinates are
	282	//
	283	// TPC \| FMD
	284	// --------+------
	285	// padrow \| sector
	286	// pad \| strip
	287	// sector \| ring
	288	//
	289	UInt_t ddl, hwaddr;
	290	Char_t r = Char_t(ring);
	291	if (!Detector2Hardware(1, r, sec, str, ddl, hwaddr))
	292	return -1;
	293	return hwaddr;
	294	}
	295
	296	//____________________________________________________________________
	297	Int_t
	298	AliFMDAltroMapping::GetPadRow(Int_t hwaddr) const
	299	{
	300	// Return sector corresponding to hardware address hwaddr. Mapping
	301	// from TPC to FMD coordinates are
	302	//
	303	// TPC \| FMD
	304	// --------+------
	305	// padrow \| sector
	306	// pad \| strip
	307	// sector \| ring
	308	//
	309	UShort_t det;
	310	Char_t ring;
	311	UShort_t sec;
	312	UShort_t str;
	313	Int_t ddl = AliFMDParameters::kBaseDDL;
	314	if (!Hardware2Detector(ddl, hwaddr, det, ring, sec, str)) return -1;
	315	return Int_t(sec);
	316	}
	317
	318	//____________________________________________________________________
	319	Int_t
	320	AliFMDAltroMapping::GetPad(Int_t hwaddr) const
	321	{
	322	// Return strip corresponding to hardware address hwaddr. Mapping
	323	// from TPC to FMD coordinates are
	324	//
	325	// TPC \| FMD
	326	// --------+------
	327	// padrow \| sector
	328	// pad \| strip
	329	// sector \| ring
	330	//
	331	UShort_t det;
	332	Char_t ring;
	333	UShort_t sec;
	334	UShort_t str;
335	Int_t ddl = AliFMDParameters::kBaseDDL;
336	if (!Hardware2Detector(ddl, hwaddr, det, ring, sec, str)) return -1;
337	return Int_t(str);
338	}
339
340	//____________________________________________________________________
341	Int_t
342	AliFMDAltroMapping::GetSector(Int_t hwaddr) const
343	{
344	// Return ring corresponding to hardware address hwaddr. Mapping
345	// from TPC to FMD coordinates are
346	//
347	// TPC \| FMD
348	// --------+------
349	// padrow \| sector
350	// pad \| strip
351	// sector \| ring
352	//
353	UShort_t det;
354	Char_t ring;
355	UShort_t sec;
356	UShort_t str;
357	Int_t ddl = AliFMDParameters::kBaseDDL;
358	if (!Hardware2Detector(ddl, hwaddr, det, ring, sec, str)) return -1;
359	return Int_t(ring);
360	}
361
362	//_____________________________________________________________________________
363	//
364	// EOF
365	//