--- a/FXAnalyse.c	Thu Oct 11 11:59:32 2012 +0200
+++ b/FXAnalyse.c	Wed Oct 17 15:52:36 2012 +0200
@@ -103,7 +103,7 @@
 // slope cancelling
 
 int SlopeMeasuring = FALSE;
-int AutoStopSlopeCancellingIfDelock = TRUE;
+int StopSlopeCancellingOnUnlocked = TRUE;
 double SlopeMath2 = 0.0; // currently applied frequency dedrifiting slope
 double TimetoSlope = 60.0;
 double SlopeMeasuringTimeBegin = 0.0;
@@ -498,10 +498,8 @@
 
 	int BoxChecked = FALSE; 
 	
-	switch (event)
-	{
+	switch (event) {
 		case EVENT_TIMER_TICK:
-			
 			if (! Acquiring)
 				break;
 			
@@ -1207,7 +1205,7 @@
 					}
 				}
 				
-				// slope cancelling 
+				// slope measurement 
 				if (SlopeMeasuring == TRUE)
 				{
 					double currentFreq = 0.0;
@@ -1222,90 +1220,71 @@
 						break;
 					}
 					
-					if ((utc - SlopeMeasuringTimeBegin) > TimetoSlope) {
+					// stop slope cancelling if the comb is not locked
+					if (StopSlopeCancellingOnUnlocked & (fabs(currentFreq - Math2_slope) < limitotakoff)) {
+						
+						double frequency = DEDRIFT_DDS_FREQUENCY;
+						if (KeepFrequ)
+							frequency = DDSFox_ReadFreq(&DDS1xAD9956);
+						
+						if (! KeepSlope)
+							SlopeMath2 = 0.0;
+						
+						SetCtrlVal(MainPanel, PANEL_SLOPETOCANCEL, SlopeMath2);
+						DDSFox_Set(&DDS1xAD9956, frequency, SlopeMath2);
 						
-						Nratio = Nratio + 1;
-						if (Nratio >= 1)
-							MoyMath2 = MoyMath2 + Moy_Math2slope;
+						Slope_Math2slope = 0.0;
+						SlopeMeasuring = FALSE;
+						SetCtrlVal(MainPanel, PANEL_MEASURE_SLOPE, 0);
+					}
+					
+					// update slope measurement
+					if (nstabilisationSlopeMeasuring < 5) {
+						nstabilisationSlopeMeasuring += 1;
+					} else {
+						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);
+					}
+					
+					// update applied slope
+					if ((utc - SlopeMeasuringTimeBegin) > TimetoSlope) {
 						
 						if (invertSlopeSign)
 							SlopeMath2 = SlopeMath2 - Slope_Math2slope;
 						else
 							SlopeMath2 = SlopeMath2 + Slope_Math2slope;
 						
-						N_Math2slope = 0.0;
-						Math2_slope = 0.0;
-						Moy_Math2slope = 0.0;
-						Slope_Math2slope = 0.0;
-						
-						if (Nratio == 1 && CenterFrequencyCh2ToDetermine == TRUE) {
-							CenterFrequencyCh2 = MoyMath2;
-							CenterFrequencyCh2ToDetermine = FALSE;
-						}
-						
-						if (Nratio == ratio) {
-							if (FrequCorrec == TRUE) {
+						if (FrequCorrec) {
+							// proportional correction
+							
+							Nratio += 1;
+							if (Nratio >= 1) {
+								MoyMath2 = MoyMath2 + Moy_Math2slope;
+							}
+							if (Nratio == 1 && CenterFrequencyCh2ToDetermine == TRUE) {
+								CenterFrequencyCh2 = MoyMath2;
+								CenterFrequencyCh2ToDetermine = FALSE;
+							}
+							if (Nratio == ratio) {
 								double correction = (MoyMath2/ratio-CenterFrequencyCh2)/TimetoSlope;
 								SlopeMath2 = SlopeMath2 + correction;
+								Nratio = 0;
+								MoyMath2 = 0.0;
 							}
-							Nratio = 0;
-							MoyMath2 = 0.0;
 						}
 						
 						double frequency = DDSFox_ReadFreq(&DDS1xAD9956);
 						SetCtrlVal(MainPanel, PANEL_SLOPETOCANCEL, SlopeMath2);
 						DDSFox_Set(&DDS1xAD9956, frequency, SlopeMath2);
 						
+						N_Math2slope = 0.0;
+						Math2_slope = 0.0;
+						Moy_Math2slope = 0.0;
+						Slope_Math2slope = 0.0;
 						nstabilisationSlopeMeasuring = 0;
 						SlopeMeasuringTimeBegin = utc;
-						
-					}
-					else
-					{
-						if (nstabilisationSlopeMeasuring < 5)
-						{
-							nstabilisationSlopeMeasuring = nstabilisationSlopeMeasuring + 1;
-							Math2_slope = currentFreq; 
-						}
-						else
-						{
-							if ((currentFreq-Math2_slope) < limitotakoff && (currentFreq-Math2_slope) > -limitotakoff)
-							{
-								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);
-							}
-							else
-							{
-								if (AutoStopSlopeCancellingIfDelock) {
-									// stop slope cancelling if the comb is not locked
-									
-									double frequency = DEDRIFT_DDS_FREQUENCY;
-									if (KeepFrequ)
-										frequency = DDSFox_ReadFreq(&DDS1xAD9956);
-									
-									if (! KeepSlope)
-										SlopeMath2 = 0.0;
-									
-									SetCtrlVal(MainPanel, PANEL_SLOPETOCANCEL, SlopeMath2);
-									DDSFox_Set(&DDS1xAD9956, frequency, SlopeMath2);
-									
-									SlopeMeasuring = FALSE;
-									N_Math2slope = 0.0;
-									Math2_slope = 0.0;
-									MoyMath2 = 0.0; 
-									Moy_Math2slope = 0.0;
-									Slope_Math2slope = 0.0;
-									CenterFrequencyCh2 = 0.0;
-									CenterFrequencyCh2ToDetermine = TRUE;
-									Nratio = -1;
-									nstabilisationSlopeMeasuring = 0;
-									
-									SetCtrlVal(MainPanel, PANEL_MEASURE_SLOPE, 0);
-								}
-							}
-						}
 					}
 				}
 				
@@ -2366,13 +2345,13 @@
 }
 
 
-int  CVICALLBACK CB_OnAutoStopSlopeCancellingIfDelock (int panel, int control, int event, 
+int  CVICALLBACK CB_OnStopSlopeCancellingOnUnlocked (int panel, int control, int event, 
 		 void *callbackData, int eventData1, int eventData2)
 {
 	switch (event)
 	{
 		case EVENT_COMMIT:
-			GetCtrlVal(MainPanel, PANEL_CHECKBOX_STOPIFAUTODE, &AutoStopSlopeCancellingIfDelock);
+			GetCtrlVal(MainPanel, PANEL_CHECKBOX_STOPIFAUTODE, &StopSlopeCancellingOnUnlocked);
 			break;
 	}
 	return 0;