Add config optimization at start time for contiuous analog acquisition (TANGODEVIC-1652)

include/asl/adlink/ADContinuousAIBoard.h

@@ -162,6 +162,11 @@ protected:
    */
   asl::ContinuousAIConfig ai_config_;
 
+  /**
+   * Configuration optimization flag.
+   */
+  bool first_config_;
+
   /**
    * Buffer index (use to identify "current" buffer).
    */

src/adlink/ADContinuousAIBoard.cpp

@@ -103,7 +103,8 @@ ADContinuousAIBoard::ADContinuousAIBoard (unsigned short _type,
     has_been_started_at_least_once_ (false),
     last_sample_index_in_last_daq_buffer_ (0),
     stop_pos_ (0),
-    stop_count_ (0)
+    stop_count_ (0),
+	first_config_(true)
 {
   //- std::cout << "ADContinuousAIBoard::ADContinuousAIBoard <-" << std::endl;
   //- std::cout << "ADContinuousAIBoard::ADContinuousAIBoard ->" << std::endl;
@@ -126,6 +127,14 @@ ADContinuousAIBoard::~ADContinuousAIBoard ()
 void ADContinuousAIBoard::configure_continuous_ai (const asl::ContinuousAIConfig& _ai_config)
     throw (asl::DAQException)
 {
+  // configuration optimization:
+  asl::ContinuousAIConfig prev_config; 
+  if (!first_config_)
+  {
+    // store previous config if not first time function is called
+    prev_config = this->ai_config_;
+  }
+
   //- store config locally
   this->ai_config_ = _ai_config;
 
@@ -147,9 +156,36 @@ void ADContinuousAIBoard::configure_continuous_ai (const asl::ContinuousAIConfig
                             "ADContinuousAIBoard::configure_continuous_ai");
   }
 
+  const asl::ActiveAIChannels& prev_ac = prev_config.get_active_channels();
+
   for (unsigned int c = 0;  c < ac.size();  c++) 
   {
-    int err = ::D2K_AI_CH_Config(this->idid_, ac[c].id, ac[c].range | ac[c].grd_ref);
+	  int err = 0;
+	  bool do_config = true;
+	  // if not first time function is called, check if config has changed
+	  if (!first_config_)
+	  {
+	    if ((prev_ac[c].id == ac[c].id) && 
+			(prev_ac[c].range == ac[c].range) &&
+			(prev_ac[c].grd_ref == ac[c].grd_ref))
+		{
+			// config equals, don't call D2K_AI_CH_Config function
+			do_config = false;
+		}
+		else
+		{
+			do_config = true;
+		}
+	  }
+	  else
+	  {
+		  do_config = true;
+	  }
+
+	  if (do_config)
+	  {
+         err = ::D2K_AI_CH_Config(this->idid_, ac[c].id, ac[c].range | ac[c].grd_ref);
+	  }
 
       if (err < 0)
       {
@@ -159,6 +195,8 @@ void ADContinuousAIBoard::configure_continuous_ai (const asl::ContinuousAIConfig
                                 err);
       }
   }
+  first_config_ = false;
+
 
   //- analog trigger config --------------------------------------------------
   //--------------------------------------------------------------------------