FT0: Added readme to calibrations

Author: wpierozak

Detectors/FIT/FT0/calibration/README.md

@@ -0,0 +1,55 @@
+# Calibrations
+
+## Events per BC Calibration
+### Description
+Generates histograms of **TVX per Bunch Crossing (BC)**. Events can be filtered by applying amplitude thresholds to the **A-side** and **C-side**.
+
+### Command-Line Options
+| Option | Default | Description |
+| :--- | :--- | :--- |
+| `--slot-len-sec` | `3600` | Duration of each slot in seconds. |
+| `--slot-len-tf` | `0` | Slot length in Time Frames (TFs). |
+| `--one-object-per-run` | — | If set, the workflow creates only one calibration object per run. |
+| `--min-entries-number` | `0` | Minimum number of entries required for a slot to be valid. |
+| `--min-ampl-side-a` | `-2147483648` | Amplitude threshold for Side A events. |
+| `--min-ampl-side-c` | `-2147483648` | Amplitude threshold for Side C events. |
+
+---
+
+## How to Run
+
+### Simulation Data
+To process simulation data, digits must first be converted to RAW format. The `o2-ft0-digi2raw` tool performs this conversion and generates the required configuration file.
+
+Once converted, you can run the calibration either as a single integrated workflow or by spawning as the sender and receiver components separately.
+
+#### Single Workflow Example
+Execute the following command within the simulation directory:
+```
+o2-raw-file-reader-workflow --input-conf FT0raw.cfg --loop -1 \
+| o2-ft0-flp-dpl-workflow --condition-backend=http://localhost:8080 \
+| o2-calibration-ft0-events-per-bc-processor --FT0EventsPerBcProcessor "--slot-len-sec=10" \
+| o2-calibration-ccdb-populator-workflow --ccdb-path=http://localhost:8080
+```
+
+Sender example (in simulation directory):
+```
+o2-raw-file-reader-workflow --input-conf FT0raw.cfg --loop -1 \
+| o2-ft0-flp-dpl-workflow --condition-backend=http://localhost:8080 \
+| o2-dpl-output-proxy --channel-config "name=downstream,method=connect,address=tcp://localhost:30453,type=push,transport=zeromq" --dataspec "downstream:FT0/DIGITSBC"
+```
+
+Receiver example:
+```
+o2-dpl-raw-proxy --channel-config "name=readout-proxy,type=pull,method=bind,address=tcp://localhost:30453,rateLogging=1,transport=zeromq" --dataspec "A:FT0/DIGITSBC/0" \
+| o2-calibration-ft0-events-per-bc-processor --FT0EventsPerBcProcessor "--slot-len-sec=10 --min-ampl-side-a=0" \
+| o2-calibration-ccdb-populator-workflow --ccdb-path=http://localhost:8080/ 
+```
+
+### CTF Data
+Example:
+```
+o2-ctf-reader-workflow --ctf-input ctf.root --onlyDet FT0 \
+| o2-calibration-ft0-events-per-bc-processor --FT0EventsPerBcProcessor "--slot-len-sec=10" \
+| o2-calibration-ccdb-populator-workflow --ccdb-path=http://localhost:8080/ 
+```

Detectors/FIT/FT0/calibration/src/EventsPerBcCalibrator.cxx

@@ -60,7 +60,7 @@ namespace o2::ft0
         auto flName = o2::ccdb::CcdbApi::generateFileName(clName);
         std::map<std::string, std::string> metaData;
         mTvxPerBcInfos.emplace_back(std::make_unique<o2::ccdb::CcdbObjectInfo>("FT0/Calib/TvxPerBc", clName, flName, metaData, slot.getStartTimeMS(), slot.getEndTimeMS()));
-        LOG(info) << "Created object valid from " << mTvxPerBcInfos.back()->getStartValidityTimestamp() << " to " << TvxPerBcInfos.back()->getEndValidityTimestamp() << ""
+        LOG(info) << "Created object valid from " << mTvxPerBcInfos.back()->getStartValidityTimestamp() << " to " << mTvxPerBcInfos.back()->getEndValidityTimestamp();
     }
 
     EventsPerBcCalibrator::Slot& EventsPerBcCalibrator::emplaceNewSlot(bool front, TFType tstart, TFType tend)