FMD module

[u/mrichter/AliRoot.git] / FMD / FMDrec / AliFMDRawStream.cxx

diff --git a/FMD/FMDrec/AliFMDRawStream.cxx b/FMD/FMDrec/AliFMDRawStream.cxx
new file mode 100644 (file)
index 0000000..485e40f
--- /dev/null
+++ b/FMD/FMDrec/AliFMDRawStream.cxx
@@ -0,0 +1,123 @@
+/**************************************************************************
+ * 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.                  *
+ **************************************************************************/
+
+/* $Id$ */
+
+//____________________________________________________________________
+//                                                                          
+// Buffer to read RAW ALTRO FMD format from a AliRawReader 
+// 
+// This class derives from AliAltroBuffer, but overloads the memer
+// function Next to do some extra processing.  In particular, it tries
+// to autodetect the sample rate.  If zero-suppression was used when
+// writing the raw data, then the automatic discovery will not work,
+// and the sample rate should be set explicitly. 
+//
+#include "AliFMDRawStream.h"           // ALIFMDRAWSTREAM_H
+// #include <AliRawReader.h>           // ALIRAWREADER_H
+#include "AliFMDParameters.h"
+// #include <AliLog.h>
+#include "AliFMDDebug.h" // Better debug macros
+// #include <iomanip>
+// #include <iostream>
+#include "AliRawReader.h"
+#include <climits>
+
+//____________________________________________________________________
+ClassImp(AliFMDRawStream)
+#if 0
+  ; // This is here to keep Emacs for indenting the next line
+#endif
+
+//____________________________________________________________________
+AliFMDRawStream::AliFMDRawStream(AliRawReader* reader) 
+  : AliAltroRawStream(reader)
+{
+  // CTOR 
+  reader->Reset();
+  // Select FMD DDL's 
+  SelectRawData("FMD");
+}
+
+//_____________________________________________________________________________
+Bool_t 
+AliFMDRawStream::ReadChannel(UInt_t& ddl, UInt_t& addr, 
+                            UInt_t& len, volatile UShort_t* data)
+{
+  // Read one channel and return.   Returns 0 when there's no more
+  // data. 
+  Int_t        l         = 0;
+  static Int_t last      = 0xFFFF; // 0xFFFF means signal is used
+  Bool_t       next      = kTRUE;
+  do {
+    Int_t signal = last;
+    if (last > 0x3FF) {
+      AliFMDDebug(30, ("Last is 0x%x, so reading a new word", last));
+      next   = Next();
+      if(!next){
+       AliFMDDebug(15, ("Read word # %d (!next)", l));
+       addr = GetPrevHWAddress();
+       ddl  = (GetPrevDDLNumber() < 0 ? UINT_MAX: UInt_t(GetPrevDDLNumber()));
+       len  = l+1; // Need to add one - l points to last valid index
+       last = signal;
+       break;
+      }
+      signal = GetSignal();
+      if (GetHWAddress() != GetPrevHWAddress() && GetPrevHWAddress() >= 0) {
+       AliFMDDebug(15, ("New hardware address, was 0x%x, now 0x%x", 
+                         GetPrevHWAddress(), GetHWAddress()));
+       addr = GetPrevHWAddress();
+       ddl  = (GetPrevDDLNumber() < 0 ? UINT_MAX : UInt_t(GetPrevDDLNumber()));
+       len  = l+1; // Need to add one - l points to last valid index
+       last = signal;
+       break;
+      }
+    }
+    // Sanity check - if the total bunch length is less than 1, then
+    // read until we get the next bunch. 
+    Int_t b  = GetTimeLength();
+    if (b < 1) { 
+      AliWarning(Form("Bunch length %0d is less than 0 for "
+                     "DDL %4d address 0x%03x", 
+                     b, ddl, addr));
+      last = 0xFFFF;
+      continue;
+    }
+
+    // Sanity check - if the current time is less than 0, then read
+    // until we get a new bunch. 
+    Int_t t  = GetTime();
+    if (t < 0) {
+      AliWarning(Form("Time %0d is less than 0 for DDL %4d address 0x%03x", 
+                     t, ddl, addr));
+      last = 0xFFFF;
+      continue;
+    }
+    l        = TMath::Max(l, t);
+    data[t]  = signal;
+    last     = 0xFFFF;
+#if 0
+    AliFMDDebug(signal > 512 ? 1 : 0, ("Signal @ %d (%d) is %d", 
+                                      time, t, data[t]));
+#endif
+  } while (next);
+  return next;
+}
+
+
+//_____________________________________________________________________________
+//
+// EOF
+//