Input buffer size update for callback mode (CPPAPIS-18)

src/BufferedEventCounting.cpp

@@ -163,10 +163,21 @@ void BufferedEventCounting::configure(void)
 
   //-------------------------configure acquisition buffer-------------------------------------------
   if (this->use_callback_)
+  {
+    // In DMA mode, if samples number = total number of points, configure
+    // input buffer size with 2 * total_nb_pts_, because input buffer size
+    // should be strictly above total_nb_pts_ in callback mode
+    if ((this->data_transfer_ == ni::dma) &&
+        (this->nb_samples_ == this->total_nb_pts_))
+    {
+      err = DAQmxCfgInputBuffer(this->task_handle_, 2 * this->total_nb_pts_);
+    }
+    else
     {
       // Configure the input buffer size with the total number of point to be received
       err = DAQmxCfgInputBuffer(this->task_handle_, this->total_nb_pts_);
     }
+  }
   else
   {
     err = DAQmxCfgInputBuffer(this->task_handle_, this->nb_samples_);

src/BufferedPositionMeasurement.cpp

@@ -162,10 +162,21 @@ void BufferedPositionMeasurement::configure (void)
   //-------------------------configure buffer-------------------------------------------
 	//std::cout<<<<"BufferedPositionMeasurement::config buffer"<<std::endl;
   if (this->use_callback_)
+  {
+    // In DMA mode, if samples number = total number of points, configure
+    // input buffer size with 2 * total_nb_pts_, because input buffer size
+    // should be strictly above total_nb_pts_ in callback mode
+    if ((this->data_transfer_ == ni::dma) &&
+        (this->nb_samples_ == this->total_nb_pts_))
+    {
+      err = DAQmxCfgInputBuffer(this->task_handle_, 2 * this->total_nb_pts_);
+    }
+    else
     {
       // Configure the input buffer size with the total number of point to be received
       err = DAQmxCfgInputBuffer(this->task_handle_, this->total_nb_pts_);
     }
+  }
   else
   {
     err = DAQmxCfgInputBuffer(this->task_handle_, this->nb_samples_);