[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.                  *
 **************************************************************************/

/* $Id$ */

//____________________________________________________________________
//                                                                          
// Mapping of ALTRO hardware channel to detector coordinates 
//
#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()
  : AliAltroMapping(0)
{}


//_____________________________________________________________________________
Bool_t
AliFMDAltroMapping::ReadMapping()
{
  return kTRUE;
}

//_____________________________________________________________________________
void
AliFMDAltroMapping::DeleteMappingArrays()
{}

//____________________________________________________________________
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 lsen  =  (sec - (board - bbase) * nsen);
  UInt_t altro =  (lsen < 2 * nsa ? 0 : (lsen < 3 * nsa ? 1 : 2));
  UInt_t sbase =  (lsen < 2 * nsa ? 0 : (lsen < 3 * nsa ? 2*nsa : 3*nsa));
  UInt_t chan  =  (sec % 2) + (lsen-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, lsen, sbase, 2, ncs, str, 
		    (sec % 2), (lsen - 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	**************************************************************************/
	15
	16	/* $Id$ */
	17
	18	//____________________________________________________________________
	19	//
	20	// Mapping of ALTRO hardware channel to detector coordinates
	21	//
	22	#include "AliFMDAltroMapping.h" // ALIFMDALTROMAPPING_H
	23	#include "AliFMDParameters.h"
	24	#include "AliLog.h"
	25
	26	//____________________________________________________________________
	27	ClassImp(AliFMDAltroMapping)
	28	#if 0
	29	; // This is here to keep Emacs for indenting the next line
	30	#endif
	31
	32	//_____________________________________________________________________________
	33	AliFMDAltroMapping::AliFMDAltroMapping()
	34	: AliAltroMapping(0)
	35	{}
	36
	37
	38	//_____________________________________________________________________________
	39	Bool_t
	40	AliFMDAltroMapping::ReadMapping()
	41	{
	42	return kTRUE;
	43	}
	44
	45	//_____________________________________________________________________________
	46	void
	47	AliFMDAltroMapping::DeleteMappingArrays()
	48	{}
	49
	50	//____________________________________________________________________
	51	Bool_t
	52	AliFMDAltroMapping::Hardware2Detector(UInt_t ddl, UInt_t addr,
	53	UShort_t& det, Char_t& ring,
	54	UShort_t& sec, UShort_t& str) const
	55	{
	56	// Translate a hardware address to detector coordinates.
	57	// The detector is simply
	58	//
	59	// ddl - kBaseDDL + 1
	60	//
	61	// The ring number, sector, and strip number is given by the addr
	62	// argument. The address argument, has the following format
	63	//
	64	// 12 7 4 0
65	// +-------------+----------+----------+
66	// \| Board \| ALTRO \| Channel \|
67	// +-------------+----------+----------+
68	//
69	// The board number identifier among other things the ring. There's
70	// up to 4 boards per DDL, and the two first (0 and 1) corresponds
71	// to the inner rings, while the two last (2 and 3) corresponds to
72	// the outer rings.
73	//
74	// The board number and ALTRO number together identifies the sensor,
75	// and hence. The lower board number (0 or 2) are the first N / 2
76	// sensors (where N is the number of sensors in the ring).
77	//
78	// There are 3 ALTRO's per card, and each ALTRO serves up to 4
79	// sensors. Which of sensor is determined by the channel number.
80	// For the inner rings, the map is
81	//
82	// ALTRO 0, Channel 0 to 7 -> Sensor 0 or 5
83	// ALTRO 0, Channel 8 to 15 -> Sensor 1 or 6
84	// ALTRO 1, Channel 0 to 7 -> Sensor 2 or 7
85	// ALTRO 2, Channel 0 to 7 -> Sensor 3 or 8
86	// ALTRO 2, Channel 8 to 15 -> Sensor 4 or 9
87	//
88	// For the outer rings, the map is
89	//
90	// ALTRO 0, Channel 0 to 3 -> Sensor 0 or 10
91	// ALTRO 0, Channel 4 to 7 -> Sensor 1 or 11
92	// ALTRO 0, Channel 8 to 11 -> Sensor 2 or 12
93	// ALTRO 0, Channel 12 to 15 -> Sensor 3 or 13
94	// ALTRO 1, Channel 0 to 3 -> Sensor 4 or 14
95	// ALTRO 1, Channel 4 to 7 -> Sensor 5 or 15
96	// ALTRO 2, Channel 0 to 3 -> Sensor 6 or 16
97	// ALTRO 2, Channel 4 to 7 -> Sensor 7 or 17
98	// ALTRO 2, Channel 8 to 11 -> Sensor 8 or 18
99	// ALTRO 2, Channel 12 to 15 -> Sensor 9 or 19
100	//
101	// Which divison of the sensor we're in, depends on the channel
102	// number only. For the inner rings, the map is
103	//
104	// Channel 0 -> Sector 0, strips 0-127
105	// Channel 1 -> Sector 1, strips 0-127
106	// Channel 3 -> Sector 0, strips 128-255
107	// Channel 4 -> Sector 1, strips 128-255
108	// Channel 5 -> Sector 0, strips 256-383
109	// Channel 6 -> Sector 1, strips 256-383
110	// Channel 7 -> Sector 0, strips 384-511
111	// Channel 8 -> Sector 1, strips 384-511
112	//
113	// There are only half as many strips in the outer sensors, so there
114	// only 4 channels are used for a full sensor. The map is
115	//
116	// Channel 0 -> Sector 0, strips 0-127
117	// Channel 1 -> Sector 1, strips 0-127
118	// Channel 3 -> Sector 0, strips 128-255
119	// Channel 4 -> Sector 1, strips 128-255
120	//
121	// With this information, we can decode the hardware address to give
122	// us detector coordinates, unique at least up a 128 strips. We
123	// return the first strip in the given range.
124	//
125	det = (ddl - AliFMDParameters::kBaseDDL) + 1;
126	UInt_t board = (addr >> 7) & 0x1F;
127	UInt_t altro = (addr >> 4) & 0x7;
128	UInt_t chan = (addr & 0xf);
129	if (board > 3) {
130	AliError(Form("Invalid board address %d for the FMD", board));
131	return kFALSE;
132	}
133	if (altro > 2) {
134	AliError(Form("Invalid ALTRO address %d for the FMD digitizer %d",
135	altro, board));
136	return kFALSE;
137	}
138	ring = (board > 1 ? 'O' : 'I');
139	UInt_t nsen = (ring == 'I' ? 10 : 20);
140	UInt_t nsa = (ring == 'I' ? 2 : 4); // Sensors per ALTRO
141	UInt_t ncs = (ring == 'I' ? 8 : 4); // Channels per sensor
142	UInt_t sen = (board % 2) * nsen / 2; // Base for half-ring
143	sen += chan / ncs + (altro == 0 ? 0 :
144	altro == 1 ? nsa : UInt_t(1.5 * nsa));
145	sec = 2 * sen + (chan % 2);
146	str = (chan % ncs) / 2 * 128;
147	return kTRUE;
148	}
149
150	//____________________________________________________________________
151	Bool_t
152	AliFMDAltroMapping::Detector2Hardware(UShort_t det, Char_t ring,
153	UShort_t sec, UShort_t str,
154	UInt_t& ddl, UInt_t& addr) const
155	{
156	// Translate detector coordinates to a hardware address.
157	// The ddl is simply
158	//
159	// kBaseDDL + (det - 1)
160	//
161	// The ring number, sector, and strip number must be encoded into a
162	// hardware address. The address argument, will have the following
163	// format on output
164	//
165	// 12 7 4 0
166	// +-------------+----------+----------+
167	// \| Board \| ALTRO \| Channel \|
168	// +-------------+----------+----------+
169	//
170	// The board number is given by the ring and sector. The inner
171	// rings board 0 and 1, while the outer are 2 and 3. Which of these
172	// depends on the sector. The map is
173	//
174	// Ring I, sector 0- 9 -> board 0
175	// Ring I, sector 10-19 -> board 1
176	// Ring O, sector 0-19 -> board 2
177	// Ring O, sector 20-39 -> board 3
178	//
179	// There are 3 ALTRO's per board. The ALTRO number is given by the
180	// sector number. For the inner rings, these are given by
181	//
182	// Sector 0- 3 or 10-13 -> ALTRO 0
183	// Sector 4- 5 or 14-15 -> ALTRO 1
184	// Sector 6- 9 or 16-19 -> ALTRO 2
185	//
186	// For the outers, it's given by
187	//
188	// Sector 0- 7 or 20-27 -> ALTRO 0
189	// Sector 8-11 or 28-31 -> ALTRO 1
190	// Sector 12-19 or 32-39 -> ALTRO 2
191	//
192	// The channel number is given by the sector and strip number. For
193	// the inners, the map is
194	//
195	// Sector 0, strips 0-127 -> Channel 0
196	// Sector 0, strips 128-255 -> Channel 2
197	// Sector 0, strips 256-383 -> Channel 4
198	// Sector 0, strips 384-511 -> Channel 6
199	// Sector 1, strips 0-127 -> Channel 1
200	// Sector 1, strips 128-255 -> Channel 3
201	// Sector 1, strips 256-383 -> Channel 5
202	// Sector 1, strips 384-511 -> Channel 7
203	// Sector 2, strips 0-127 -> Channel 8
204	// Sector 2, strips 128-255 -> Channel 10
205	// Sector 2, strips 256-383 -> Channel 12
206	// Sector 2, strips 384-511 -> Channel 14
207	// Sector 3, strips 0-127 -> Channel 9
208	// Sector 3, strips 128-255 -> Channel 11
209	// Sector 3, strips 256-383 -> Channel 13
210	// Sector 3, strips 384-511 -> Channel 15
211	//
212	// and so on, up to sector 19. For the outer, the map is
213	//
214	// Sector 0, strips 0-127 -> Channel 0
215	// Sector 0, strips 128-255 -> Channel 2
216	// Sector 1, strips 0-127 -> Channel 1
217	// Sector 1, strips 128-255 -> Channel 3
218	// Sector 2, strips 0-127 -> Channel 4
219	// Sector 2, strips 128-255 -> Channel 6
220	// Sector 3, strips 0-127 -> Channel 5
221	// Sector 3, strips 128-255 -> Channel 7
222	// Sector 4, strips 0-127 -> Channel 8
223	// Sector 4, strips 128-255 -> Channel 10
224	// Sector 5, strips 0-127 -> Channel 9
225	// Sector 5, strips 128-255 -> Channel 11
226	// Sector 6, strips 0-127 -> Channel 12
227	// Sector 6, strips 128-255 -> Channel 14
228	// Sector 7, strips 0-127 -> Channel 13
229	// Sector 7, strips 128-255 -> Channel 15
230	//
231	// and so on upto sector 40.
232	//
233	// With this information, we can decode the detector coordinates to
234	// give us a unique hardware address
235	//
236	ddl = AliFMDParameters::kBaseDDL + (det - 1);
237	UInt_t nsen = (ring == 'I' ? 10 : 20);
238	UInt_t nsa = (ring == 'I' ? 2 : 4); // Sensors per ALTRO
239	UInt_t ncs = (ring == 'I' ? 8 : 4); // Channels per sensor
240	UInt_t bbase = (ring == 'I' ? 0 : 2);
241	UInt_t board = bbase + sec / nsen;
242	UInt_t lsen = (sec - (board - bbase) * nsen);
243	UInt_t altro = (lsen < 2 * nsa ? 0 : (lsen < 3 * nsa ? 1 : 2));
244	UInt_t sbase = (lsen < 2 * nsa ? 0 : (lsen < 3 * nsa ? 2nsa : 3nsa));
245	UInt_t chan = (sec % 2) + (lsen-sbase) / 2 * ncs + 2 * str / 128;
246	AliDebug(40, Form("\n"
247	" chan = (%d %% 2) + (%d-%d) / %d * %d + 2 * %d / 128\n"
248	" = %d + %d + %d = %d",
249	sec, lsen, sbase, 2, ncs, str,
250	(sec % 2), (lsen - sbase) / 2 * ncs,
251	2 * str / 128, chan));
252	addr = chan + (altro << 4) + (board << 7);
253
254	return kTRUE;
255	}
256
257	//____________________________________________________________________
258	Int_t
259	AliFMDAltroMapping::GetHWAddress(Int_t sec, Int_t str, Int_t ring) const
260	{
261	// Return hardware address corresponding to sector sec, strip str,
262	// and ring ring. Mapping from TPC to FMD coordinates are
263	//
264	// TPC \| FMD
265	// --------+------
266	// padrow \| sector
267	// pad \| strip
268	// sector \| ring
269	//
270	UInt_t ddl, hwaddr;
271	Char_t r = Char_t(ring);
272	if (!Detector2Hardware(1, r, sec, str, ddl, hwaddr))
273	return -1;
274	return hwaddr;
275	}
276
277	//____________________________________________________________________
278	Int_t
279	AliFMDAltroMapping::GetPadRow(Int_t hwaddr) const
280	{
281	// Return sector corresponding to hardware address hwaddr. Mapping
282	// from TPC to FMD coordinates are
283	//
284	// TPC \| FMD
285	// --------+------
286	// padrow \| sector
287	// pad \| strip
288	// sector \| ring
289	//
290	UShort_t det;
291	Char_t ring;
292	UShort_t sec;
293	UShort_t str;
294	Int_t ddl = AliFMDParameters::kBaseDDL;
295	if (!Hardware2Detector(ddl, hwaddr, det, ring, sec, str)) return -1;
296	return Int_t(sec);
297	}
298
299	//____________________________________________________________________
300	Int_t
301	AliFMDAltroMapping::GetPad(Int_t hwaddr) const
302	{
303	// Return strip corresponding to hardware address hwaddr. Mapping
304	// from TPC to FMD coordinates are
305	//
306	// TPC \| FMD
307	// --------+------
308	// padrow \| sector
309	// pad \| strip
310	// sector \| ring
311	//
312	UShort_t det;
313	Char_t ring;
314	UShort_t sec;
315	UShort_t str;
316	Int_t ddl = AliFMDParameters::kBaseDDL;
317	if (!Hardware2Detector(ddl, hwaddr, det, ring, sec, str)) return -1;
318	return Int_t(str);
319	}
320
321	//____________________________________________________________________
322	Int_t
323	AliFMDAltroMapping::GetSector(Int_t hwaddr) const
324	{
325	// Return ring corresponding to hardware address hwaddr. Mapping
326	// from TPC to FMD coordinates are
327	//
328	// TPC \| FMD
329	// --------+------
330	// padrow \| sector
331	// pad \| strip
332	// sector \| ring
333	//
334	UShort_t det;
335	Char_t ring;
336	UShort_t sec;
337	UShort_t str;
338	Int_t ddl = AliFMDParameters::kBaseDDL;
339	if (!Hardware2Detector(ddl, hwaddr, det, ring, sec, str)) return -1;
340	return Int_t(ring);
341	}
342
343	//_____________________________________________________________________________
344	//
345	// EOF
346	//