Mythen3 improved synchronization (#231)

Disabling scans for multi module Mythen3, since there is no feedback of the detectors being ready
startDetector first starts the slaves then the master
acquire firs calls startDetector for the slaves then acquire on the master
getMaster to read back from hardware which one is master

slsDetectorSoftware/include/sls/Detector.h

@@ -1305,6 +1305,9 @@ class Detector {
     /** [Mythen3] gate delay for all gates in auto or trigger timing mode
      * (internal gating). Gate index: 0-2, -1 for all */
     Result<std::array<ns, 3>> getGateDelayForAllGates(Positions pos = {}) const;
+
+    Result<bool> getMaster(Positions pos = {}) const;
+
     ///@{
 
     /** @name CTB / Moench Specific */

slsDetectorSoftware/src/Detector.cpp

@@ -674,7 +674,23 @@ void Detector::startReceiver() { pimpl->Parallel(&Module::startReceiver, {}); }
 void Detector::stopReceiver() { pimpl->Parallel(&Module::stopReceiver, {}); }
 
 void Detector::startDetector() {
-    pimpl->Parallel(&Module::startAcquisition, {});
+    auto detector_type = getDetectorType().squash();
+    if (detector_type == defs::MYTHEN3){
+        auto is_master = getMaster();
+        std::vector<int> master;
+        std::vector<int> slaves;
+        for(int i=0; i<size(); ++i){
+            if (is_master[i])
+                master.push_back(i);
+            else
+                slaves.push_back(i);
+        }
+        pimpl->Parallel(&Module::startAcquisition, slaves);
+        pimpl->Parallel(&Module::startAcquisition, master);
+    }else{
+        pimpl->Parallel(&Module::startAcquisition, {});
+    }
+    
 }
 
 void Detector::startDetectorReadout() {
@@ -717,6 +733,9 @@ Result<defs::scanParameters> Detector::getScan(Positions pos) const {
 }
 
 void Detector::setScan(const defs::scanParameters t) {
+    if(getDetectorType().squash() == defs::MYTHEN3 && size()>1 && t.enable != 0){
+        throw DetectorError("Scan is only allowed for single module Mythen 3 because of synchronization");
+    }
     pimpl->Parallel(&Module::setScan, {}, t);
 }
 
@@ -1592,6 +1611,11 @@ Detector::getGateDelayForAllGates(Positions pos) const {
     return pimpl->Parallel(&Module::getGateDelayForAllGates, pos);
 }
 
+Result<bool> Detector::getMaster(Positions pos) const{
+    return pimpl->Parallel(&Module::isMaster, pos);
+}
+
+
 // CTB/ Moench Specific
 
 Result<int> Detector::getNumberOfAnalogSamples(Positions pos) const {

slsDetectorSoftware/src/DetectorImpl.cpp

@@ -1056,11 +1056,15 @@ void DetectorImpl::registerDataCallback(void (*userCallback)(detectorData *,
 }
 
 int DetectorImpl::acquire() {
+
     // ensure acquire isnt started multiple times by same client
     if (!isAcquireReady()) {
         return FAIL;
     }
 
+    // We need this to handle Mythen3 synchronization
+    auto detector_type = Parallel(&Module::getDetectorType, {}).squash();
+
     try {
         struct timespec begin, end;
         clock_gettime(CLOCK_REALTIME, &begin);
@@ -1088,7 +1092,25 @@ int DetectorImpl::acquire() {
 
         // start and read all
         try {
-            Parallel(&Module::startAndReadAll, {});
+            if(detector_type == defs::MYTHEN3 && detectors.size() > 1){
+                //Multi module mythen
+                std::vector<int> master;
+                std::vector<int> slaves;
+                auto is_master = Parallel(&Module::isMaster, {});
+                slaves.reserve(detectors.size()-1); //check this one!!
+                for (size_t i = 0; i<detectors.size(); ++i){
+                    if(is_master[i])
+                        master.push_back(i);
+                    else
+                        slaves.push_back(i);
+                }
+                Parallel(&Module::startAcquisition, slaves);
+                Parallel(&Module::startAndReadAll, master);
+            }else{
+                //Normal acquire
+                Parallel(&Module::startAndReadAll, {});
+            }
+            
         } catch (...) {
             if (receiver)
                 Parallel(&Module::stopReceiver, {});

slsDetectorSoftware/src/Module.cpp

@@ -1994,6 +1994,10 @@ std::array<time::ns, 3> Module::getGateDelayForAllGates() const {
     return sendToDetector<std::array<time::ns, 3>>(F_GET_GATE_DELAY_ALL_GATES);
 }
 
+bool Module::isMaster() const{
+    return sendToDetector<int>(F_GET_MASTER);
+}
+
 // CTB / Moench Specific
 int Module::getNumberOfAnalogSamples() const {
     return sendToDetector<int>(F_GET_NUM_ANALOG_SAMPLES);

slsDetectorSoftware/src/Module.h

@@ -425,6 +425,7 @@ class Module : public virtual slsDetectorDefs {
     int64_t getGateDelay(int gateIndex) const;
     void setGateDelay(int gateIndex, int64_t value);
     std::array<time::ns, 3> getGateDelayForAllGates() const;
+    bool isMaster() const;
 
     /**************************************************
      *                                                *