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4 * Author: The ALICE Off-line Project. *
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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
53 //____________________________________________________________________
54 ClassImp(AliFMDRawWriter)
56 ; // This is here to keep Emacs for indenting the next line
59 //____________________________________________________________________
60 AliFMDRawWriter::AliFMDRawWriter(AliFMD* fmd)
61 : TTask("FMDRawWriter", "Writer of Raw ADC values from the FMD"),
72 //____________________________________________________________________
74 AliFMDRawWriter::Exec(Option_t*)
76 // Turn digits into raw data.
78 // Digits are read from the Digit branch, and processed to make
79 // three DDL files, one for each of the sub-detectors FMD1, FMD2,
82 // The raw data files consists of a header, followed by ALTRO
93 // An ALTRO formatted block, in the FMD context, consists of a
94 // number of counts followed by a trailer.
96 // +------------------+
99 // | possible fillers |
100 // +------------------+
102 // +------------------+
105 // The counts are listed backwards, that is, starting with the
106 // latest count, and ending in the first.
108 // Each count consist of 1 or more ADC samples of the VA1_ALICE
109 // pre-amp. signal. Just how many samples are used depends on
110 // whether the ALTRO over samples the pre-amp. Each sample is a
111 // 10-bit word, and the samples are grouped into 40-bit blocks
113 // +------------------------------------+
114 // | S(1) | S(2) | S(3) | S(4) |
115 // | ... | ... | ... | ... |
116 // | S(n) | T(n) | n+2 | 2AA |
117 // +------------------------------------+
118 // Counts + possible filler
120 // The trailer of the number of words of signales, the starting
121 // strip number, the sector number, and the ring ID; each 10-bit
122 // words, packed into 40-bits.
124 // +------------------------------------+
125 // | 2AAA | Len | A | Address |
126 // +------------------------------------+
129 // Note, that this method assumes that the digits are ordered.
131 AliLoader* loader = fFMD->GetLoader();
132 loader->LoadDigits();
133 TTree* digitTree = loader->TreeD();
135 Error("Digits2Raw", "no digit tree");
139 TClonesArray* digits = new TClonesArray("AliFMDDigit", 1000);
140 fFMD->SetTreeAddress();
141 TBranch* digitBranch = digitTree->GetBranch(fFMD->GetName());
143 Error("Digits2Raw", "no branch for %s", fFMD->GetName());
146 digitBranch->SetAddress(&digits);
148 Int_t nEvents = Int_t(digitTree->GetEntries());
149 for (Int_t event = 0; event < nEvents; event++) {
151 digitTree->GetEvent(event);
153 // Write out the digits
156 loader->UnloadDigits();
160 //____________________________________________________________________
162 AliFMDRawWriter::WriteDigits(TClonesArray* digits)
164 // WRite an array of digits to disk file
165 Int_t nDigits = digits->GetEntries();
166 if (nDigits < 1) return;
168 AliFMDParameters* pars = AliFMDParameters::Instance();
169 UShort_t threshold = 0;
171 UInt_t prevaddr = 0xFFF;
172 // UShort_t prevStrip = 0;
174 // Which channel number in the ALTRO channel we're at
176 UShort_t preSamples = 0;
178 // How many times the ALTRO Samples one VA1_ALICE channel
179 Int_t sampleRate = 1;
181 // A buffer to hold 1 ALTRO channel - Normally, one ALTRO channel
182 // holds 128 VA1_ALICE channels, sampled at a rate of `sampleRate'
183 TArrayI data(pars->GetChannelsPerAltro() * 8);
186 AliAltroBuffer* altro = 0;
188 // Loop over the digits in the event. Note, that we assume the
189 // the digits are in order in the branch. If they were not, we'd
190 // have to cache all channels before we could write the data to
191 // the ALTRO buffer, or we'd have to set up a map of the digits.
192 for (Int_t i = 0; i < nDigits; i++) {
194 AliFMDDigit* digit = static_cast<AliFMDDigit*>(digits->At(i));
196 UShort_t det = digit->Detector();
197 Char_t ring = digit->Ring();
198 UShort_t sector = digit->Sector();
199 UShort_t strip = digit->Strip();
202 threshold = pars->GetZeroSuppression(det, ring, sector, strip);
203 if (!pars->Detector2Hardware(det, ring, sector, strip, ddl, addr)) {
204 AliError(Form("Failed to get hardware address for FMD%d%c[%2d,%3d]",
205 det, ring, sector, strip));
208 if (addr != prevaddr) {
209 // Flush a channel to output
210 AliDebug(15, Form("Now hardware address 0x%x from FMD%d%c[%2d,%3d] "
211 "(board 0x%x, chip 0x%x, channel 0x%x), flushing old "
212 "channel at 0x%x with %d words",
213 addr, det, ring, sector, strip,
214 (addr >> 7), (addr >> 4) & 0x7, addr & 0xf,
216 if (altro) altro->WriteChannel(prevaddr,nWords,data.fArray,threshold);
219 for (size_t i = 0; i < nWords; i++) data[i] = digit->Count(0);
221 if (ddl != prevddl) {
222 AliDebug(15, Form("FMD: New DDL, was %d, now %d", prevddl, ddl));
223 // If an altro exists, delete the object, flushing the data to
224 // disk, and closing the file.
226 // When the first argument is false, we write the real
228 AliDebug(15, Form("Closing output"));
230 altro->WriteDataHeader(kFALSE, kFALSE);
235 // Need to open a new DDL!
236 TString filename(AliDAQ::DdlFileName(fFMD->GetName(), ddl));
237 AliDebug(15, Form("New altro buffer with DDL file %s", filename.Data()));
238 // Create a new altro buffer - a `1' as the second argument
239 // means `write mode'
240 altro = new AliAltroBuffer(filename.Data());
241 altro->SetMapping(pars->GetAltroMap());
242 // Write a dummy (first argument is true) header to the DDL
243 // file - later on, when we close the file, we write the real
245 altro->WriteDataHeader(kTRUE, kFALSE);
248 // Store the counts of the ADC in the channel buffer
249 sampleRate = pars->GetSampleRate(det, ring, sector, strip);
250 for (int s = 0; s < sampleRate; s++) {
251 data[nWords] = digit->Count(s);
255 // Finally, we need to close the final ALTRO buffer if it wasn't
258 if (nWords > 0) altro->WriteChannel(prevaddr,nWords,data.fArray,threshold);
260 altro->WriteDataHeader(kFALSE, kFALSE);
265 //____________________________________________________________________
267 AliFMDRawWriter::WriteDigits(TClonesArray* digits)
269 Int_t nDigits = digits->GetEntries();
270 if (nDigits < 1) return;
272 AliFMDParameters* pars = AliFMDParameters::Instance();
273 AliFMDAltroWriter* writer = 0;
274 Int_t sampleRate = -1;
277 std::ofstream* file = 0;
279 for (Int_t i = 0; i < nDigits; i++) {
281 AliFMDDigit* digit = static_cast<AliFMDDigit*>(digits->At(i));
282 UInt_t thisDDL, thisHwaddr;
283 UShort_t det = digit->Detector();
284 Char_t ring = digit->Ring();
285 UShort_t sector = digit->Sector();
286 UShort_t strip = digit->Strip();
287 if (!pars->Detector2Hardware(det,ring,sector,strip,thisDDL,thisHwaddr)) {
288 AliError(Form("Failed to get hardware address for FMD%d%c[%2d,%3d]",
289 det, ring, sector, strip));
292 AliDebug(40, Form("Got DDL=%d and address=%d from FMD%d%c[%2d,%3d]",
293 thisDDL, thisHwaddr, det, ring, sector, strip));
294 // Check if we're still in the same channel
295 if (thisHwaddr != hwaddr) {
296 AliDebug(30, Form("Now hardware address 0x%x from FMD%d%c[%2d,%3d] "
297 "(board 0x%x, chip 0x%x, channel 0x%x)",
298 thisHwaddr, det, ring, sector, strip,
299 (thisHwaddr >> 7), (thisHwaddr >> 4) & 0x7,
301 if (writer) writer->AddChannelTrailer(hwaddr);
304 // Check if we're still in the same detector (DDL)
305 if (ddl != thisDDL) {
307 AliDebug(1, Form("Closing altro writer %p", writer));
308 if ((ret = writer->Close()) < 0) {
309 AliError(Form("Error: %s", writer->ErrorString(ret)));
320 // If we haven't got a writer (either because none were made so
321 // far, or because we've switch DDL), make one.
323 AliDebug(1, Form("Opening new ALTRO writer w/file %s", AliDAQ::DdlFileName("FMD",ddl)));
324 file = new std::ofstream(AliDAQ::DdlFileName("FMD",ddl));
325 if (!file || !*file) {
326 AliFatal(Form("Failed to open file %s", AliDAQ::DdlFileName("FMD",ddl)));
329 writer = new AliFMDAltroWriter(*file);
330 writer->SetThreshold(pars->GetZeroSuppression(det, ring, sector, strip));
332 // Write out our signal
333 sampleRate = pars->GetSampleRate(det,ring,sector,strip);
334 writer->AddSignal(digit->Count1());
335 if (sampleRate >= 2) writer->AddSignal(digit->Count2());
336 if (sampleRate >= 3) writer->AddSignal(digit->Count3());
339 writer->AddChannelTrailer(hwaddr);
351 //____________________________________________________________________