--- a/FXAnalyse.c	Mon Oct 29 14:43:57 2012 +0100
+++ b/FXAnalyse.c	Mon Oct 29 14:46:33 2012 +0100
@@ -108,7 +108,7 @@
 double TimetoSlope = 60.0;
 double SlopeMeasuringTimeBegin = 0.0;
 
-double Slope_Math2slope=0.0,Math2_slope=0.0,Moy_Math2slope=0.0;
+double Slope_Math2slope=0.0,Moy_Math2slope=0.0;
 int N_Math2slope=0.0;
 
 double LimitToDelock=5.0;
@@ -126,6 +126,7 @@
 	SLOPE_REFERENCE_HG_CAVITY = 1,
 };
 
+double previousFreq = 0.0;
 int invertSlopeSign = 0;
 int slopeReference = SLOPE_REFERENCE_MICROWAVE;
 
@@ -136,10 +137,10 @@
 double CenteringTimeBegin10K = 0.0;
 
 
-int DDSFox_Set(DDSParameter *DDS, double Frequency, double Sweeprate)
+int DDSFox_Set(DDSParameter *DDS, double Frequency, double SweepRate)
 {
 	DDS->Frequency = Frequency; 
-	DDS->SweepRate = Sweeprate;
+	DDS->SweepRate = SweepRate;
 	
 	DDSFox_SetFreq(DDS);
 	DDSFox_SetDf(DDS);
@@ -148,6 +149,14 @@
 }
 
 
+int DDSFox_SetSweepRate(DDSParameter *DDS, double SweepRate)
+{
+	DDS->SweepRate = SweepRate;
+	DDSFox_SetDf(DDS);
+	return 0;
+}
+
+
 muParserHandle_t initMathParser() 
 {
 	muParserHandle_t parser = mupCreate();
@@ -1225,7 +1234,9 @@
 					}
 					
 					// stop slope cancelling if the comb is not locked
-					if (StopSlopeCancellingOnUnlocked & (fabs(currentFreq - Math2_slope) < limitotakoff)) {
+					if (StopSlopeCancellingOnUnlocked
+						& (previousFreq != 0.0)
+						& (fabs(currentFreq - previousFreq) > limitotakoff)) {
 						
 						double frequency = DEDRIFT_DDS_FREQUENCY;
 						if (KeepFrequ)
@@ -1244,11 +1255,11 @@
 					
 					// update slope measurement
 					N_Math2slope = N_Math2slope + 1;
-					Math2_slope = currentFreq;
-					Moy_Math2slope = ((N_Math2slope-1)*Moy_Math2slope + Math2_slope)/N_Math2slope;
-					Slope_Math2slope = (Slope_Math2slope*(N_Math2slope-2) + 6*(Math2_slope-Moy_Math2slope)/N_Math2slope)/(N_Math2slope+1);
+					previousFreq = currentFreq;
+					Moy_Math2slope = ((N_Math2slope-1)*Moy_Math2slope + currentFreq)/N_Math2slope;
+					Slope_Math2slope = (Slope_Math2slope*(N_Math2slope-2) + 6*(currentFreq-Moy_Math2slope)/N_Math2slope)/(N_Math2slope+1);
 					// update indicator
-					SetCtrlVal(MainPanel, PANEL_SLOPE_MEASURED, 0);
+					SetCtrlVal(MainPanel, PANEL_SLOPE_MEASURED, Slope_Math2slope);
 					
 					// update applied slope
 					if ((utc - SlopeMeasuringTimeBegin) > TimetoSlope) {
@@ -1277,12 +1288,10 @@
 							}
 						}
 						
-						double frequency = DDSFox_ReadFreq(&DDS1xAD9956);
 						SetCtrlVal(MainPanel, PANEL_SLOPE_APPLIED, SlopeMath2);
-						DDSFox_Set(&DDS1xAD9956, frequency, SlopeMath2);
+						DDSFox_SetSweepRate(&DDS1xAD9956, SlopeMath2);
 						
 						N_Math2slope = 0.0;
-						Math2_slope = 0.0;
 						Moy_Math2slope = 0.0;
 						Slope_Math2slope = 0.0;
 						SlopeMeasuringTimeBegin = utc;
@@ -2217,10 +2226,7 @@
 				
 				SlopeMeasuringTimeBegin = utc;
 				SlopeMeasuring = TRUE;
-				
-				frequency = DDSFox_ReadFreq(&DDS1xAD9956);
-				GetCtrlVal(panel, PANEL_SLOPE_APPLIED, &SlopeMath2);
-				DDSFox_Set(&DDS1xAD9956, frequency, SlopeMath2);
+				previousFreq = 0.0;
 				
 				Nratio = -1;
 				CenterFrequencyCh2ToDetermine = TRUE ;
@@ -2240,7 +2246,6 @@
 				
 				SlopeMeasuring = FALSE; 
 				N_Math2slope = 0.0;
-				Math2_slope = 0.0;
 				Moy_Math2slope = 0.0;
 				Slope_Math2slope = 0.0;
 				MoyMath2 = 0.0; 
@@ -2452,14 +2457,11 @@
 int CVICALLBACK CB_SetSlope (int panel, int control, int event,
 		void *callbackData, int eventData1, int eventData2)
 {
-	double frequency;
-	
 	switch (event)
 	{
 		case EVENT_COMMIT:
 			GetCtrlVal(panel, control, &SlopeMath2);
-			frequency = DDSFox_ReadFreq(&DDS1xAD9956);
-			DDSFox_Set(&DDS1xAD9956, frequency, SlopeMath2);
+			DDSFox_SetSweepRate(&DDS1xAD9956, SlopeMath2);
 			break;
 	}
 	return 0;