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4 * Author: The ALICE Off-line Project. *
5 * Contributors are mentioned in the code where appropriate. *
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14 **************************************************************************/
16 /** @file AliFMDRawWriter.cxx
17 @author Christian Holm Christensen <cholm@nbi.dk>
18 @date Mon Mar 27 12:45:56 2006
19 @brief Class to write raw data
21 //____________________________________________________________________
23 // Class to write ADC values to a raw data file
25 // This class writes FMD Raw data to a file. The sample rate (number
26 // of times the ALTRO ADC samples each pre-amp. channel - that is,
27 // data from a single strip), can be set via SetSampleRate.
29 // Zero-suppression can be enabled by calling SetThreshold with a
30 // non-zero argument. ADC values less than the value set will not be
31 // written to output. Note, that if you use zero-suppression, you
32 // need to explicitly set the sample rate when reading back the data
33 // with AliFMDRawReader.
35 // This class uses the AliAltroBuffer class to write the data in the
36 // ALTRO format. See the Exec member function for more information on
39 #include <AliLog.h> // ALILOG_H
40 #include <AliLoader.h> // ALILOADER_H
41 #include <AliAltroBuffer.h> // ALIALTROBUFFER_H
42 #include "AliFMD.h" // ALIFMD_H
43 #include "AliFMDParameters.h" // ALIFMDPARAMETERS_H
44 #include "AliFMDDigit.h" // ALIFMDDIGIT_H
45 #include "AliFMDRawWriter.h" // ALIFMDRAWREADER_H
46 #include "AliFMDAltroMapping.h" // ALIFMDALTROMAPPING_H
47 // #include "AliFMDAltroIO.h" // ALIFMDALTROWRITER_H
48 #include <TArrayI.h> // ROOT_TArrayI
49 #include <TClonesArray.h> // ROOT_TClonesArray
52 //____________________________________________________________________
53 ClassImp(AliFMDRawWriter)
55 ; // This is here to keep Emacs for indenting the next line
58 //____________________________________________________________________
59 AliFMDRawWriter::AliFMDRawWriter(AliFMD* fmd)
60 : TTask("FMDRawWriter", "Writer of Raw ADC values from the FMD"),
68 //____________________________________________________________________
70 AliFMDRawWriter::Exec(Option_t*)
72 // Turn digits into raw data.
74 // Digits are read from the Digit branch, and processed to make
75 // three DDL files, one for each of the sub-detectors FMD1, FMD2,
78 // The raw data files consists of a header, followed by ALTRO
89 // An ALTRO formatted block, in the FMD context, consists of a
90 // number of counts followed by a trailer.
92 // +------------------+
95 // | possible fillers |
96 // +------------------+
98 // +------------------+
101 // The counts are listed backwards, that is, starting with the
102 // latest count, and ending in the first.
104 // Each count consist of 1 or more ADC samples of the VA1_ALICE
105 // pre-amp. signal. Just how many samples are used depends on
106 // whether the ALTRO over samples the pre-amp. Each sample is a
107 // 10-bit word, and the samples are grouped into 40-bit blocks
109 // +------------------------------------+
110 // | S(1) | S(2) | S(3) | S(4) |
111 // | ... | ... | ... | ... |
112 // | S(n) | T(n) | n+2 | 2AA |
113 // +------------------------------------+
114 // Counts + possible filler
116 // The trailer of the number of words of signales, the starting
117 // strip number, the sector number, and the ring ID; each 10-bit
118 // words, packed into 40-bits.
120 // +------------------------------------+
121 // | 2AAA | Len | A | Address |
122 // +------------------------------------+
125 // Note, that this method assumes that the digits are ordered.
127 AliLoader* loader = fFMD->GetLoader();
128 loader->LoadDigits();
129 TTree* digitTree = loader->TreeD();
131 Error("Digits2Raw", "no digit tree");
135 TClonesArray* digits = new TClonesArray("AliFMDDigit", 1000);
136 fFMD->SetTreeAddress();
137 TBranch* digitBranch = digitTree->GetBranch(fFMD->GetName());
139 Error("Digits2Raw", "no branch for %s", fFMD->GetName());
142 digitBranch->SetAddress(&digits);
144 Int_t nEvents = Int_t(digitTree->GetEntries());
145 for (Int_t event = 0; event < nEvents; event++) {
147 digitTree->GetEvent(event);
149 // Write out the digits
152 loader->UnloadDigits();
156 //____________________________________________________________________
158 AliFMDRawWriter::WriteDigits(TClonesArray* digits)
160 // WRite an array of digits to disk file
161 Int_t nDigits = digits->GetEntries();
162 if (nDigits < 1) return;
164 AliFMDParameters* pars = AliFMDParameters::Instance();
165 UShort_t threshold = 0;
167 UInt_t prevaddr = 0xFFF;
168 // UShort_t prevStrip = 0;
170 // Which channel number in the ALTRO channel we're at
172 UShort_t preSamples = 0;
174 // How many times the ALTRO Samples one VA1_ALICE channel
175 Int_t sampleRate = 1;
177 // A buffer to hold 1 ALTRO channel - Normally, one ALTRO channel
178 // holds 128 VA1_ALICE channels, sampled at a rate of `sampleRate'
179 TArrayI data(pars->GetChannelsPerAltro() * 8);
182 AliAltroBuffer* altro = 0;
184 // Loop over the digits in the event. Note, that we assume the
185 // the digits are in order in the branch. If they were not, we'd
186 // have to cache all channels before we could write the data to
187 // the ALTRO buffer, or we'd have to set up a map of the digits.
188 for (Int_t i = 0; i < nDigits; i++) {
190 AliFMDDigit* digit = static_cast<AliFMDDigit*>(digits->At(i));
192 UShort_t det = digit->Detector();
193 Char_t ring = digit->Ring();
194 UShort_t sector = digit->Sector();
195 UShort_t strip = digit->Strip();
198 threshold = pars->GetZeroSuppression(det, ring, sector, strip);
199 if (!pars->Detector2Hardware(det, ring, sector, strip, ddl, addr)) {
200 AliError(Form("Failed to get hardware address for FMD%d%c[%2d,%3d]",
201 det, ring, sector, strip));
204 if (addr != prevaddr) {
205 // Flush a channel to output
206 AliDebug(15, Form("Now hardware address 0x%x from FMD%d%c[%2d,%3d] "
207 "(board 0x%x, chip 0x%x, channel 0x%x), flushing old "
208 "channel at 0x%x with %d words",
209 addr, det, ring, sector, strip,
210 (addr >> 7), (addr >> 4) & 0x7, addr & 0xf,
212 if (altro) altro->WriteChannel(prevaddr,nWords,data.fArray,threshold);
215 for (size_t i = 0; i < nWords; i++) data[i] = digit->Count(0);
217 if (ddl != prevddl) {
218 AliDebug(15, Form("FMD: New DDL, was %d, now %d", prevddl, ddl));
219 // If an altro exists, delete the object, flushing the data to
220 // disk, and closing the file.
222 // When the first argument is false, we write the real
224 AliDebug(15, Form("Closing output"));
226 altro->WriteDataHeader(kFALSE, kFALSE);
231 // Need to open a new DDL!
232 TString filename(Form("%s_%d.ddl", fFMD->GetName(), ddl));
233 AliDebug(15, Form("New altro buffer with DDL file %s", filename.Data()));
234 // Create a new altro buffer - a `1' as the second argument
235 // means `write mode'
236 altro = new AliAltroBuffer(filename.Data());
237 altro->SetMapping(pars->GetAltroMap());
238 // Write a dummy (first argument is true) header to the DDL
239 // file - later on, when we close the file, we write the real
241 altro->WriteDataHeader(kTRUE, kFALSE);
244 // Store the counts of the ADC in the channel buffer
245 sampleRate = pars->GetSampleRate(det, ring, sector, strip);
246 for (int s = 0; s < sampleRate; s++) {
247 data[nWords] = digit->Count(s);
251 // Finally, we need to close the final ALTRO buffer if it wasn't
254 if (nWords > 0) altro->WriteChannel(prevaddr,nWords,data.fArray,threshold);
256 altro->WriteDataHeader(kFALSE, kFALSE);
261 //____________________________________________________________________
263 AliFMDRawWriter::WriteDigits(TClonesArray* digits)
265 Int_t nDigits = digits->GetEntries();
266 if (nDigits < 1) return;
268 AliFMDParameters* pars = AliFMDParameters::Instance();
269 AliFMDAltroWriter* writer = 0;
270 Int_t sampleRate = -1;
273 std::ofstream* file = 0;
275 for (Int_t i = 0; i < nDigits; i++) {
277 AliFMDDigit* digit = static_cast<AliFMDDigit*>(digits->At(i));
278 UInt_t thisDDL, thisHwaddr;
279 UShort_t det = digit->Detector();
280 Char_t ring = digit->Ring();
281 UShort_t sector = digit->Sector();
282 UShort_t strip = digit->Strip();
283 if (!pars->Detector2Hardware(det,ring,sector,strip,thisDDL,thisHwaddr)) {
284 AliError(Form("Failed to get hardware address for FMD%d%c[%2d,%3d]",
285 det, ring, sector, strip));
288 AliDebug(40, Form("Got DDL=%d and address=%d from FMD%d%c[%2d,%3d]",
289 thisDDL, thisHwaddr, det, ring, sector, strip));
290 // Check if we're still in the same channel
291 if (thisHwaddr != hwaddr) {
292 AliDebug(30, Form("Now hardware address 0x%x from FMD%d%c[%2d,%3d] "
293 "(board 0x%x, chip 0x%x, channel 0x%x)",
294 thisHwaddr, det, ring, sector, strip,
295 (thisHwaddr >> 7), (thisHwaddr >> 4) & 0x7,
297 if (writer) writer->AddChannelTrailer(hwaddr);
300 // Check if we're still in the same detector (DDL)
301 if (ddl != thisDDL) {
303 AliDebug(1, Form("Closing altro writer %p", writer));
304 if ((ret = writer->Close()) < 0) {
305 AliError(Form("Error: %s", writer->ErrorString(ret)));
316 // If we haven't got a writer (either because none were made so
317 // far, or because we've switch DDL), make one.
319 AliDebug(1, Form("Opening new ALTRO writer w/file FMD_%d.ddl", ddl));
320 file = new std::ofstream(Form("FMD_%d.ddl", ddl));
321 if (!file || !*file) {
322 AliFatal(Form("Failed to open file FMD_%d.ddl", ddl));
325 writer = new AliFMDAltroWriter(*file);
326 writer->SetThreshold(pars->GetZeroSuppression(det, ring, sector, strip));
328 // Write out our signal
329 sampleRate = pars->GetSampleRate(det,ring,sector,strip);
330 writer->AddSignal(digit->Count1());
331 if (sampleRate >= 2) writer->AddSignal(digit->Count2());
332 if (sampleRate >= 3) writer->AddSignal(digit->Count3());
335 writer->AddChannelTrailer(hwaddr);
347 //____________________________________________________________________