From 063c2fd33f68fe28890acea677c64bfcbcdf5725 Mon Sep 17 00:00:00 2001
From: Tomasz Ostafin <tomasz.dariusz.ostafin@cern.ch>
Date: Wed, 11 Dec 2024 20:58:04 +0100
Subject: [PATCH] Encode LS and TO with the same abs value

---
 CalibPPS/TimingCalibration/src/DoublePeakCorrection.cc | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/CalibPPS/TimingCalibration/src/DoublePeakCorrection.cc b/CalibPPS/TimingCalibration/src/DoublePeakCorrection.cc
index 36eba263ba517..dd0077bf0558d 100644
--- a/CalibPPS/TimingCalibration/src/DoublePeakCorrection.cc
+++ b/CalibPPS/TimingCalibration/src/DoublePeakCorrection.cc
@@ -126,9 +126,12 @@ double DoublePeakCorrection::getCorrectedLeadingTime(const double leadingTime,
 
 double DoublePeakCorrection::getEncodedLsAndTimeOffset(const PlaneKey& planeKey) const {
   if (auto it = lsAndTimeOffsets_.find(planeKey); it != std::end(lsAndTimeOffsets_)) {
-    constexpr double encodingMultiple = 100'000.0;
     const auto [doublePeakLs, doublePeakTimeOffset] = it->second;
-    return doublePeakLs * encodingMultiple + doublePeakTimeOffset;
+    constexpr unsigned int lsEncodingMultiple{100};
+    if (doublePeakTimeOffset >= 0.0) {
+      return doublePeakLs * lsEncodingMultiple + doublePeakTimeOffset;
+    }
+    return -(doublePeakLs * lsEncodingMultiple - doublePeakTimeOffset);
   }
   return 0.0;
 }