ADC: fix stopping single shot acquisition while running not working

- added grtopbock stop comment

Signed-off-by: Andrei Popa <andrei.popa@analog.com>

Author: andrei47w

gr-util/src/grtopblock.cpp

@@ -152,7 +152,7 @@ void GRTopBlock::stop()
 	Q_EMIT aboutToStop();
 	running = false;
 	top->stop();
-	top->wait(); // ??
+	top->wait(); // wait for flow to stop and then request rebuild or other actions
 	Q_EMIT stopped();
 }
 

packages/generic-plugins/plugins/adc/src/adcfftinstrumentcontroller.cpp

@@ -300,6 +300,8 @@ void ADCFFTInstrumentController::createFFTSink(AcqTreeNode *node)
 		setSingleShot(b);
 		if(b && !m_started) {
 			Q_EMIT requestStart();
+		} else if(!b && m_started) {
+			Q_EMIT requestStop();
 		}
 	});
 	connect(m_ui, &ADCInstrument::requestStart, this, &ADCInstrumentController::requestStart);

packages/generic-plugins/plugins/adc/src/adctimeinstrumentcontroller.cpp

@@ -141,6 +141,8 @@ void ADCTimeInstrumentController::createTimeSink(AcqTreeNode *node)
 		setSingleShot(b);
 		if(b && !m_started) {
 			Q_EMIT requestStart();
+		} else if(!b && m_started) {
+			Q_EMIT requestStop();
 		}
 	});
 	connect(m_ui, &ADCInstrument::requestStart, this, &ADCInstrumentController::requestStart);