Update readme

src/ecmcDAQDataArray.cpp

@@ -82,8 +82,8 @@ void ecmcDAQDataArray::connectToDataSources() {
     dataElementCount_ = dataElementCount_ + (*pDataCh)->getDataElementCount();
   }
   
-  // Header: First element is time stamp then 4 elements per channel
-  totalElementCount_ = dataElementCount_ + channelCounter_ * 4 + 1;
+  // Header: First element is channel count then time stamp then 4 elements per channel
+  totalElementCount_ = dataElementCount_ + channelCounter_ * 4 + 2;
 
   // Now we we can finally allocate teh buffer (ecmc is still not in realtime, enterRT)
   buffer_ = new double [totalElementCount_];
@@ -113,9 +113,9 @@ void ecmcDAQDataArray::connectToDataSources() {
 *....
 */
 void ecmcDAQDataArray::buildArrayHeader(){
-  // 4 elements plus first timestamp to first data element, only first element will change in realtime
+  // 4 elements plus channel count + timestamp  to first data element, only first element will change in realtime
 
-  size_t dataStartOffset = channelCounter_* 4 + 1;
+  size_t dataStartOffset = channelCounter_* 4 + 2;
   firstDataElementIndex_ = dataStartOffset;
 
   if( totalElementCount_ < dataStartOffset) {
@@ -123,6 +123,8 @@ void ecmcDAQDataArray::buildArrayHeader(){
   }
 
   size_t index = 0;
+  buffer_[index] = channelCounter_; // Channel count
+  index++;
   buffer_[index] = 0; // Timestamp, will be set in each loop in execute
   index++;
 
@@ -158,7 +160,7 @@ void ecmcDAQDataArray::execute() {
   }
 
   //convert to micro secs 32bit and double
-  buffer_[0] =(double)((master_->getTimeNs()/1000)& 0xFFFFFFFF);
+  buffer_[1] =(double)((master_->getTimeNs()/1000)& 0xFFFFFFFF);
 
   int first = 1;
   size_t index =  firstDataElementIndex_ ;