#include <tcpsupp.h>
#include <utility.h>
#include <ansi_c.h>
#include <cvirte.h>		
#include <userint.h>
#include <formatio.h>
#include <inifile.h>
#include <string.h>

#include "FXAnalyse.h" 
#include "Plot.h"
#include "Allan.h"
#include "DDS4xAD9912.h"
#include "DDS_Fox.h" 
#include "muParserDLL.h"
#include "utils.h"
#include "stat.h"
#include "future.h"
#include "data-provider.h"
#include "sr-data-logger.h"
#include "config.h"
#include "logging.h"


#define FREP_STEP_SIZE 50000.0
#define SPEED_OF_LIGHT 299792458.0 // m/s
#define SR_WAVELENGTH  698.4460    // nm
#define HG_WAVELENGTH 1062.4000    // nm

// select which data provider to use
#ifdef NDEBUG
#define DataProvider KKDataProvider
#else
#define DataProvider FakeDataProvider
#endif


// data acquisition status
int acquiring;
// data queue
CmtTSQHandle dataQueue;
// data provider thread
CmtThreadFunctionID dataProviderThread;


struct event event;
double utc;
double Ch1, Ch2, Ch3, Ch4;
double Math1, Math2, Math3, Math4, Math5;
double N1, N2, N3;
double Ndiv = 8.0;
double Sign1 = 1.0, Sign2 = 1.0, Sign3 = 0.0;
void *MathParser1, *MathParser2, *MathParser3, *MathParser4, *MathParser5;


// panels
static int MainPanel;
static int CalcNPanel;
static int EstimateNPanel;


struct adev {
	Allan_Data allan;
	double *data;
	const char *title;
	double normalization;
	int control;
};


#define ADEV(__channel, __normalization)		\
	{											\
		.data = & ## __channel,					\
		.title = #__channel,					\
		.normalization = __normalization,		\
		.control = PANEL_ADEV_ ## __channel		\
	}


static int adev_toggle(struct adev *adev)
{
	if (adev->allan.active)
		Allan_ClosePanel(&(adev->allan));
	else
		Allan_InitPanel(&(adev->allan), adev->title,
			adev->normalization, MainPanel, adev->control);
	return adev->allan.active;
}


static inline void adev_update(struct adev *adev)
{
	if (adev->allan.active)
		Allan_AddFrequency(&(adev->allan), *(adev->data));
}


struct adev adevs[] = {
	ADEV(Ch1, 1.84e12),
	ADEV(Ch2, 10.0e3),
	ADEV(Ch3, 429.228e12),
	ADEV(Ch4, 275.0e3),
	ADEV(Math1, 250.0e6),
	ADEV(Math2, 194.395e12),
	ADEV(Math3, 282.143e12),
	ADEV(Math4, 429.228e12),
	ADEV(Math5, 1.0),
	{ NULL }
};


struct plot {
	Plot_Data plot;
	double *data;
	const char *title;
	double min;
	double max;
	int control;
};


#define PLOT(__channel, __min, __max) 			\
	{											\
		.data = & ## __channel, 				\
		.title = #__channel,					\
		.min = __min,							\
		.max = __max,							\
		.control = PANEL_PLOT_ ## __channel		\
	}


static int plot_toggle(struct plot *plot)
{
	if (plot->plot.active)
		Plot_ClosePanel(&(plot->plot));
	else
		Plot_InitPanel(&(plot->plot), plot->title,
			plot->min, plot->max, MainPanel, plot->control);
	return plot->plot.active;
}


static inline void plot_update(struct plot *plot)
{
	if (plot->plot.active)
		Plot_AddFrequency(&(plot->plot), *(plot->data));
}

struct plot plots[] = {
	PLOT(Ch1, 54.999e6, 55.001e6),
	PLOT(Ch2, 0.0, 0.0),
	PLOT(Ch3, 0.0, 0.0),
	PLOT(Ch4, 0.0, 0.0),
	PLOT(Math1, 0.0, 0.0),
	PLOT(Math2, 0.0, 0.0),
	PLOT(Math3, 0.0, 0.0),
	PLOT(Math4, 0.0, 0.0),
	PLOT(Math5, 0.0, 0.0),
	{ NULL }
};


// dedrift DDS
DDSParameter DDS1xAD9956;
// 4xAD9912 DDS box
DDS4xAD9912_Data DDS4xAD9912;


enum {
	LO = 1,
	HG = 2,
	SR = 4,
};

enum {
	N_MEASUREMENT_NONE,
	N_MEASUREMENT_INIT,
	N_MEASUREMENT_SLOPE,
	N_MEASUREMENT_ADJUST_FREQ_PLUS,
	N_MEASUREMENT_FREP_PLUS,
	N_MEASUREMENT_ADJUST_FREQ_MINUS,
	N_MEASUREMENT_FREP_MINUS,
};

int Measuring_1 = N_MEASUREMENT_NONE;
int Measuring_2 = N_MEASUREMENT_NONE;											  
int Measuring_3 = N_MEASUREMENT_NONE;

int nobs = 0;
int settling = 0;

double f0_DDS1 = 110000000.0, f0_DDS2, f0_DDS3, df_DDS3;

double SlopeTime1=40.0, DeltaT_1=20.0, delta_f_lock_1=500.0;
double SlopeTime2=40.0, DeltaT_2=20.0, delta_f_lock_2=500.0;
double SlopeTime3=40.0, DeltaT_3=20.0, delta_f_lock_3=500.0;

double t1, t2, t3;
double f_rep_slope, f_beat_slope;
double f_rep_plus, f_rep_minus;
double f_beat_plus, f_beat_minus;
double N_measured; 

double Frequencystep1=10000.0, tbegin1=0.0, Frepbefore1=0.0, Frequency1=0.0;
double Frequencystep2=10.0, tbegin2=0.0, Frepbefore2=0.0, Ch2before=0.0, Frequency2=0.0;
double Frequencystep3=100000.0, tbegin3=0.0, Frepbefore3=0.0, Frequency3=0.0;

int Getsign1=FALSE,Getsign2=FALSE,Getsign3=FALSE;

struct stat stat_math1, stat_ch2, stat_ch3, freq;
struct rollmean rollmean_ch1, rollmean_ch2, rollmean_ch3, rollmean_ch4;


// dedrift
enum {
	DEDRIFT_REFERENCE_MICROWAVE = 0,
	DEDRIFT_REFERENCE_HG = 1,
};

struct dedrift {
	int enabled;        // dedrift enabled
	int reference;      // reference frequency
	int invert;         // invert applied slope sign
	int doubleslope;    // double applied slope
	int keep_freq;      // keep current frequency value when dedrift is disabled
	int keep_slope;     // keep current slope value when dedrift is disabled
	double freq0;       // DDS center frequency
	double threshold;   // maximum allowed frequency change
	double applied;     // currently applied slope
	double interval;    // measurement duration
	double t0;          // beginning of currrent measurement interval
};

struct dedrift dedrift = {
	.enabled = FALSE,
	.reference = DEDRIFT_REFERENCE_MICROWAVE,
	.invert = FALSE,
	.doubleslope = FALSE,
	.keep_freq = TRUE,
	.keep_slope = TRUE,
	.freq0 = 70e6,
	.threshold = 100.0,
	.applied = 0.0,
	.interval = 30.0,
	.t0 = 0.0
};


// recenter
struct recenter {
	int enabled;		// recenter enabled
	int lo;				// recenter microwave beatnote
	int sr;				// recenter Sr beatnote
	int hg;				// recenter Hg beatnote
	double interval;	// interval
	double t0;			// beginning of current interval
};

struct recenter recenter = {
	.enabled = FALSE,
	.lo = FALSE,
	.sr = FALSE,
	.hg = FALSE,
	.interval = 1800.0,
	.t0 = 0.0
};


// data loggging
static char *datafolder;

struct datafile {
	char *name;
	double *data;
	int nchan;
	int control;
	int write;
};

#define DATAFILE(__name, __data, __nchan, __control, __write)	\
	{															\
		.name = __name,											\
		.data = __data,											\
		.nchan = __nchan,										\
		.control = __control,									\
		.write = __write										\
	}

struct datafile datafiles[] = {
     DATAFILE("Raw", event.data, 4, PANEL_SAVE_RAW, TRUE),
     DATAFILE("DDS", DDS4xAD9912.frequency, 4, PANEL_SAVE_DDS, FALSE),
     DATAFILE("Lo", &Math2, 1, PANEL_SAVE_LO, FALSE),
     DATAFILE("Hg", &Math3, 1, PANEL_SAVE_HG, FALSE),
     DATAFILE("Sr", &Math4, 1, PANEL_SAVE_SR, FALSE),
     DATAFILE("Ex", &Math5, 1, PANEL_SAVE_EXTRA, FALSE),
     { NULL, }
};


static void write_data(const char *folder, const char *name, const char *id, 
		const char *timestr, double utc, double *v, int nchan)
{
	char line[1024];
	char filename[FILENAME_MAX];
	
	// construct filename in the form folder\\id-name.txt
	snprintf(filename, sizeof(filename), "%s\\%s-%s.txt", folder, id, name);
	
	int fd = OpenFile(filename, VAL_WRITE_ONLY, VAL_APPEND, VAL_ASCII);
	switch (nchan)
	{
		case 1:
			Fmt(line, "%s\t%f[p3]\t%f[p3]", 
				timestr, utc, v[0]);
			break;
		case 4:
			Fmt(line, "%s\t%f[p3]\t%f[p3]\t%f[p3]\t%f[p3]\t%f[p3]",
				timestr, utc, v[0], v[1], v[2], v[3]);
			break;
		default:
			strcpy(line, "?");
	}
	WriteLine(fd, line, -1);
	CloseFile(fd);
}


static inline void datafile_append(struct datafile *d, char *id, char *timestr)
{
	if (d->write)
		write_data(datafolder, d->name, id, timestr, utc, d->data, d->nchan);
}


static struct datalogger datalogger;


void * muParserNew()
{
	void *parser = mupCreate();
	
	mupDefineOprtChars(parser, "abcdefghijklmnopqrstuvwxyzµ"
                        	   "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
                        	   "+-*^/?<>=#!$%&|~'_");
	
	mupDefineVar(parser, "Ch1", &Ch1);
	mupDefineVar(parser, "Ch2", &Ch2);
	mupDefineVar(parser, "Ch3", &Ch3);
	mupDefineVar(parser, "Ch4", &Ch4);
	mupDefineVar(parser, "DDS1", &(DDS4xAD9912.frequency[0]));
	mupDefineVar(parser, "DDS2", &(DDS4xAD9912.frequency[1]));
	mupDefineVar(parser, "DDS3", &(DDS4xAD9912.frequency[2]));
	mupDefineVar(parser, "DDS4", &(DDS4xAD9912.frequency[3]));
	mupDefineVar(parser, "N1", &N1);
	mupDefineVar(parser, "N2", &N2);
	mupDefineVar(parser, "N3", &N3);
	mupDefineVar(parser, "Sign1", &Sign1);
	mupDefineVar(parser, "Sign2", &Sign2);
	mupDefineVar(parser, "Sign3", &Sign3);
	mupDefineVar(parser, "Ndiv", &Ndiv);
	mupDefinePostfixOprt(parser, "P", &Peta,  1);
	mupDefinePostfixOprt(parser, "T", &Tera,  1);
	mupDefinePostfixOprt(parser, "G", &Giga,  1);
	mupDefinePostfixOprt(parser, "M", &Mega,  1);
	mupDefinePostfixOprt(parser, "k", &kilo,  1);
	mupDefinePostfixOprt(parser, "m", &milli, 1);
	mupDefinePostfixOprt(parser, "u", &micro, 1);
	mupDefinePostfixOprt(parser, "µ", &micro, 1);
	mupDefinePostfixOprt(parser, "n", &nano,  1);
	mupDefinePostfixOprt(parser, "p", &pico,  1);
	mupDefinePostfixOprt(parser, "f", &femto, 1);
	
	return parser;
}


void CVICALLBACK DataAvailableCB (CmtTSQHandle queueHandle, unsigned int event,
		int value, void *callbackData);


int main (int argc, char *argv[])
{
	int rv;
	double frequency;
	char expr[1024];

	if ((MainPanel = LoadPanel (0, "FXAnalyse.uir", PANEL)) < 0)
		return -1;
	if ((CalcNPanel = LoadPanel (MainPanel, "FXAnalyse.uir", CALCN)) < 0)
		return -1;
	if ((EstimateNPanel = LoadPanel (MainPanel, "FXAnalyse.uir", ESTIMATEN)) < 0)
		return -1;

	// logging
	logger_init();
	
	// load configuration file
	char path[MAX_PATHNAME_LEN];
	GetIniFilePath(path);
	IniText configuration = Ini_New(TRUE);
	Ini_ReadFromFile(configuration, path);

	// data folder
	rv = Ini_GetStringCopy(configuration, "data", "folder", &datafolder);
	if (rv <= 0) {
		logmessage(ERROR, "data folder not configured in %s", path);
		// do not allow to start the acquisition
		SetCtrlAttribute(MainPanel, PANEL_STARTBUTTON, ATTR_DIMMED, TRUE);
	}
	
	// get AD9956 configuration parameters
	char host[256];
	int port;
	double clock;
	rv = Ini_GetStringIntoBuffer(configuration, "AD9956", "host", host, sizeof(host));
	if (! rv)
		return -1;
	rv = Ini_GetInt(configuration, "AD9956", "port", &port);
	if (! rv)
		return -1;
	rv = Ini_GetDouble(configuration, "AD9956", "clock", &clock);
	if (! rv)
		return -1;
	
	// dispose configuration
	Ini_Dispose(configuration);

	// Sr data logger
	sr_datalogger_init(&datalogger);
	
	// dedrift DDS
	DDSFox_Initialize(&DDS1xAD9956, host, port, dedrift.freq0);
	
	// initialize 4x AD9959 DDS box
	DDS4xAD9912_Reset(&DDS4xAD9912);
	GetCtrlVal(MainPanel, PANEL_DDS1, &frequency);
	DDS4xAD9912_SetFrequency(&DDS4xAD9912, 1, frequency);
	GetCtrlVal(MainPanel, PANEL_DDS2, &frequency);
	DDS4xAD9912_SetFrequency(&DDS4xAD9912, 2, frequency);
	GetCtrlVal(MainPanel, PANEL_DDS3, &frequency);
	DDS4xAD9912_SetFrequency(&DDS4xAD9912, 3, frequency);
	GetCtrlVal(MainPanel, PANEL_DDS4, &frequency);
	DDS4xAD9912_SetFrequency(&DDS4xAD9912, 4, frequency);
	
	GetCtrlVal(MainPanel, PANEL_N1CHOICE, &N1);
	GetCtrlVal(MainPanel, PANEL_N2CHOICE, &N2);
	GetCtrlVal(MainPanel, PANEL_N3CHOICE, &N3);

	MathParser1 = muParserNew();
	GetCtrlVal(MainPanel, PANEL_MATHSTRING1, expr);
	mupSetExpr(MathParser1, expr);
	
	MathParser2 = muParserNew();
	mupDefineVar(MathParser2, "Math1", &Math1);
	GetCtrlVal(MainPanel, PANEL_MATHSTRING2, expr);
	mupSetExpr(MathParser2, expr);
	
	MathParser3 = muParserNew();
	mupDefineVar(MathParser3, "Math1", &Math1);
	mupDefineVar(MathParser3, "Math2", &Math2);
	GetCtrlVal(MainPanel, PANEL_MATHSTRING3, expr);
	mupSetExpr(MathParser3, expr);
	
	MathParser4 = muParserNew();
	mupDefineVar(MathParser4, "Math1", &Math1);
	mupDefineVar(MathParser4, "Math2", &Math2);
	mupDefineVar(MathParser4, "Math3", &Math3);
	GetCtrlVal(MainPanel, PANEL_MATHSTRING4, expr);
	mupSetExpr(MathParser4, expr);
	
	MathParser5 = muParserNew();
	mupDefineVar(MathParser5, "Math1", &Math1);
	mupDefineVar(MathParser5, "Math2", &Math2);
	mupDefineVar(MathParser5, "Math3", &Math3);
	mupDefineVar(MathParser5, "Math4", &Math4);
	GetCtrlVal(MainPanel, PANEL_MATHSTRING5, expr);
	mupSetExpr(MathParser5, expr);
	
	// data queue
	CmtNewTSQ(128, sizeof(struct event), 0, &dataQueue);

	// register callback to execute when data will be in the data queue
	CmtInstallTSQCallback(dataQueue, EVENT_TSQ_ITEMS_IN_QUEUE, 1,
		DataAvailableCB, NULL, CmtGetCurrentThreadID(), NULL);
	
	DisplayPanel(MainPanel);
	
	RunUserInterface();
	
	DiscardPanel(MainPanel);
	return 0;
}

int CVICALLBACK QuitCallback (int panel, int control, int event,
		void *callbackData, int eventData1, int eventData2)
{
	switch (event)
	{
		case EVENT_COMMIT:
			QuitUserInterface(0);
			break;
	}
	return 0;
}

int CVICALLBACK CB_OnEventMain(int panel, int event,
		void *callbackData, int eventData1, int eventData2)
{
	int control, index;
	double step;
	
#define do_arrow(__DDS, __STEP)										\
	do {															\
		GetCtrlIndex(panel, __STEP, &index);						\
		if ((eventData1 == VAL_RIGHT_ARROW_VKEY) && (index < 14))	\
			SetCtrlIndex(panel, __STEP, index + 1);					\
		if ((eventData1 == VAL_LEFT_ARROW_VKEY) && (index > 0))		\
			SetCtrlIndex(panel, __STEP, index - 1);					\
		GetCtrlVal(panel, __STEP, &step);							\
		SetCtrlAttribute(panel, __DDS, ATTR_INCR_VALUE, step);  	\
	} while (0) 
	
	switch (event) {
		case EVENT_KEYPRESS:
			/* key code */
			switch (eventData1) {
				case VAL_RIGHT_ARROW_VKEY:
				case VAL_LEFT_ARROW_VKEY:					
					control = GetActiveCtrl(panel);
					switch (control) {
						case PANEL_DDS1:
						case PANEL_DDS1STEP:
							do_arrow(PANEL_DDS1, PANEL_DDS1STEP);
							break;
						case PANEL_DDS2:
						case PANEL_DDS2STEP:
							do_arrow(PANEL_DDS2, PANEL_DDS2STEP);
							break;
						case PANEL_DDS3:
						case PANEL_DDS3STEP:
							do_arrow(PANEL_DDS3, PANEL_DDS3STEP);
							break;
						case PANEL_DDS4:
						case PANEL_DDS4STEP:
							do_arrow(PANEL_DDS4, PANEL_DDS4STEP);
							break;
					}
					break;
				case VAL_F2_VKEY :
					SetActiveCtrl(panel, PANEL_DDS1);
					break;
				case VAL_F3_VKEY :
					SetActiveCtrl(panel, PANEL_DDS2);
					break;
				case VAL_F4_VKEY :
					SetActiveCtrl(panel, PANEL_DDS3);
					break;
				case VAL_F5_VKEY :
					SetActiveCtrl(panel, PANEL_DDS4);
					break;
			}
			break;
	}
	return 0;
}

int CVICALLBACK CB_OnStart (int panel, int control, int event,
		void *callbackData, int eventData1, int eventData2)
{
	switch (event)
	{
		case EVENT_COMMIT:
			if (acquiring)
				break;

			logmsg("start");
			SetCtrlAttribute(panel, PANEL_STARTBUTTON, ATTR_DIMMED, TRUE);
			acquiring = 1;
			
			// start data provider thread
			CmtScheduleThreadPoolFunctionAdv(
				DEFAULT_THREAD_POOL_HANDLE, DataProvider, NULL,
				THREAD_PRIORITY_HIGHEST, NULL, 0, NULL, 0, &dataProviderThread);

			break;
	}
	return 0;
}

int CVICALLBACK CB_OnStop (int panel, int control, int event,
		void *callbackData, int eventData1, int eventData2)
{
	switch (event) {
		case EVENT_COMMIT:
			if (! acquiring)
				break;
			
			logmsg("stop");
			acquiring = 0;

			// wait for data provider thread to terminate
			CmtWaitForThreadPoolFunctionCompletion(
				DEFAULT_THREAD_POOL_HANDLE, dataProviderThread,
				OPT_TP_PROCESS_EVENTS_WHILE_WAITING);
			CmtReleaseThreadPoolFunctionID(
				DEFAULT_THREAD_POOL_HANDLE, dataProviderThread);

			SetCtrlAttribute(panel, PANEL_STARTBUTTON, ATTR_DIMMED, FALSE);
			
			break;
	}
	return 0;
}

void CVICALLBACK DataAvailableCB (CmtTSQHandle queueHandle, unsigned int ev,
		int value, void *callbackData)
{
	int read;
	
	switch (ev) {
		case EVENT_TSQ_ITEMS_IN_QUEUE:
			// read data from the data queue
			while (value > 0) {
				
				read = CmtReadTSQData(queueHandle, &event, 1, TSQ_INFINITE_TIMEOUT, 0);
				if (read != 1)
					logmsg("Error!");
				value = value - read;
				
				utc = event.time.tv_sec + event.time.tv_usec * 1e-6;
				Ch1 = event.data[0];
				Ch2 = event.data[1];
				Ch3 = event.data[2];
				Ch4 = event.data[3];

				// update display
				SetCtrlVal(MainPanel, PANEL_UTC, utc);
				SetCtrlVal(MainPanel, PANEL_CH1, Ch1);
				SetCtrlVal(MainPanel, PANEL_CH2, Ch2);
				SetCtrlVal(MainPanel, PANEL_CH3, Ch3);  
				SetCtrlVal(MainPanel, PANEL_CH4, Ch4);

				// compute
				Math1 = mupEval(MathParser1);
				Math2 = mupEval(MathParser2);
				Math3 = mupEval(MathParser3);
				Math4 = mupEval(MathParser4);
				Math5 = mupEval(MathParser5);
				
				// update display.  numeric controllers do not format values
				// with a thousands separator: use string controllers and a 
				// custom formatting function
				char buffer[256];
				SetCtrlVal(MainPanel, PANEL_MATH1, thousands(buffer, sizeof(buffer), "%.6f", Math1));
				SetCtrlVal(MainPanel, PANEL_MATH2, thousands(buffer, sizeof(buffer), "%.3f", Math2));
				SetCtrlVal(MainPanel, PANEL_MATH3, thousands(buffer, sizeof(buffer), "%.3f", Math3));
				SetCtrlVal(MainPanel, PANEL_MATH4, thousands(buffer, sizeof(buffer), "%.3f", Math4));
				SetCtrlVal(MainPanel, PANEL_MATH5, thousands(buffer, sizeof(buffer), "%.3f", Math5));

				// update timeseries plots
				for (struct plot *plot = plots; plot->data; plot++)
					plot_update(plot);

				// update allan deviation plots
				for (struct adev *adev = adevs; adev->data; adev++)
					adev_update(adev);
				
				// N measurement

				switch (Measuring_1) {
					
					case N_MEASUREMENT_NONE:
						// not measuring
						break;
					
					case N_MEASUREMENT_INIT:
						// initialization step
						
						// set DDS1 to nominal frequency
						DDS4xAD9912_SetFrequency(&DDS4xAD9912, 1, f0_DDS1);
						
						// record current DDS frequencies
						f0_DDS2 = DDS4xAD9912_GetFrequency(&DDS4xAD9912, 2);
						
						t1 = utc;
						t2 = t3 = 0.0;
						nobs = 0;
						stat_zero(&stat_math1);
						f_rep_plus = f_rep_minus = 0.0;
						
						// next step
						Measuring_1 += 1;
						break;
						
					case N_MEASUREMENT_SLOPE:
						// slope measurement
						
						stat_accumulate(&stat_math1, Math1);
						
						if ((utc - t1) > SlopeTime1) {
							f_rep_slope = stat_math1.slope;
							
							// frep positive step
							DDS4xAD9912_RampFrequency(&DDS4xAD9912, 1, f0_DDS1 + delta_f_lock_1, FREP_STEP_SIZE);
							
							// allow counter to settle
							settling = 3;
							
							// next step
							Measuring_1 += 1;
						}
						break;
						
					case N_MEASUREMENT_ADJUST_FREQ_PLUS:
					case N_MEASUREMENT_ADJUST_FREQ_MINUS:
						// adjust DDS frequency to keep beatnote within the bandpass filter
						
						if (settling-- > 0)
							break;
						
						double fDDS2 = DDS4xAD9912_GetFrequency(&DDS4xAD9912, 2);
						DDS4xAD9912_SetFrequency(&DDS4xAD9912, 2, fDDS2 + 275000 - Ch4);
						
						// allow counter to settle
						settling = 3;
						
						// next step
						Measuring_1 += 1;
						break;								
						
					case N_MEASUREMENT_FREP_PLUS:
						// frep positive step
						
						if (settling-- > 0)
							break;
						
						if (t2 == 0.0)
							t2 = utc;
						
						f_rep_plus += Math1 - f_rep_slope * (utc - t2);
						nobs += 1;
						
						if ((utc - t2) > DeltaT_1) {
							f_rep_plus = f_rep_plus / nobs;
							nobs = 0;
							
							// frep negative step
							DDS4xAD9912_RampFrequency(&DDS4xAD9912, 1, f0_DDS1 - delta_f_lock_1, FREP_STEP_SIZE);
							
							// allow counter to settle
							settling = 3;
							
							// next step
							Measuring_1 += 1;
						}
						break;
						
					case N_MEASUREMENT_FREP_MINUS:
						// frep negative step
						
						if (settling-- > 0)
							break;
						
						if (t3 == 0.0)
							t3 = utc;
						
						f_rep_minus += Math1 - f_rep_slope * (utc - t2);
						nobs += 1;
						
						if ((utc - t3) > DeltaT_1) {
							f_rep_minus = f_rep_minus / nobs;
							nobs = 0;
							
							// compute N1
							double delta_f_rep = f_rep_minus - f_rep_plus;
							N_measured = Sign1 * 2 * Ndiv * delta_f_lock_1 / delta_f_rep;
							SetCtrlVal(CalcNPanel, CALCN_N, N_measured);
							
							// back to nominal frep
							DDS4xAD9912_RampFrequency(&DDS4xAD9912, 1, f0_DDS1, FREP_STEP_SIZE);
							DDS4xAD9912_SetFrequency(&DDS4xAD9912, 2, f0_DDS2);
							
							// done
							Measuring_1 = N_MEASUREMENT_NONE;
						}
						break;
				}

				switch (Measuring_2) {

					case N_MEASUREMENT_NONE:
						// not measuring
						break;
					
					case N_MEASUREMENT_INIT:
						// initialization step
						
						// set DDS1 to nominal frequency
						DDS4xAD9912_SetFrequency(&DDS4xAD9912, 1, f0_DDS1);
						
						// record current DDS frequencies
						f0_DDS2 = DDS4xAD9912_GetFrequency(&DDS4xAD9912, 2);
						f0_DDS3 = DDS4xAD9912_GetFrequency(&DDS4xAD9912, 3);
						
						t1 = utc;
						t2 = t3 = 0.0;
						nobs = 0;
						stat_zero(&stat_math1);
						stat_zero(&stat_ch2);
						f_rep_plus = f_rep_minus = 0.0;
						f_beat_plus = f_beat_minus = 0.0;
						
						// next step
						Measuring_2 += 1;
						break;
						
					case N_MEASUREMENT_SLOPE:
						// slope measurement
						
						stat_accumulate(&stat_math1, Math1);
						stat_accumulate(&stat_ch2, Ch2);

						if ((utc - t1) > SlopeTime2) {
							f_rep_slope = stat_math1.slope;
							f_beat_slope = stat_ch2.slope;
							
							// frep positive step
							double fDDS1 = f0_DDS1 + delta_f_lock_2;
							DDS4xAD9912_RampFrequency(&DDS4xAD9912,1, fDDS1, FREP_STEP_SIZE);
							
							// adjust DDS3 to keep beatnote within the bandpass filter. prediction
							double fDDS3 = f0_DDS3 + Sign1 * Sign2 * N2/N1 * Ndiv * delta_f_lock_2;
							df_DDS3 = fDDS3 - DDS4xAD9912_GetFrequency(&DDS4xAD9912, 3);
							DDS4xAD9912_SetFrequency(&DDS4xAD9912, 3, fDDS3);
						
							// allow counter to settle
							settling = 3;
							
							// next step
							Measuring_2 += 1;
						}
						break;

					case N_MEASUREMENT_ADJUST_FREQ_PLUS:
					case N_MEASUREMENT_ADJUST_FREQ_MINUS:
						// adjust DDS frequency to keep beatnote within the bandpass filter
						
						if (settling-- > 0)
							break;
						
						double fDDS2 = DDS4xAD9912_GetFrequency(&DDS4xAD9912, 2) + 275000 - Ch4;
						DDS4xAD9912_SetFrequency(&DDS4xAD9912, 2, fDDS2);
						
						double fDDS3 = DDS4xAD9912_GetFrequency(&DDS4xAD9912, 3) + 10000 - Ch2;
						df_DDS3 = df_DDS3 + 10000 - Ch2;
						DDS4xAD9912_SetFrequency(&DDS4xAD9912, 3, fDDS3);

						// allow counter to settle
						settling = 3;

						// next step
						Measuring_2 += 1;
						break;
						
					case N_MEASUREMENT_FREP_PLUS:
						// frep positive step
						
						if (settling-- > 0)
							break;

						if (t2 == 0.0)
							t2 = utc;

						f_rep_plus += Math1 + 250000000 - f_rep_slope * (utc - t2);
						f_beat_plus += Ch2 - f_beat_slope * (utc - t2);
						nobs += 1;
						
						if ((utc - t2) > DeltaT_2) {
							f_rep_plus = f_rep_plus / nobs;
							f_beat_plus = f_beat_plus / nobs;
							nobs = 0;

							// negative frequency step
							double fDDS1 = f0_DDS1 - delta_f_lock_2;
							DDS4xAD9912_RampFrequency(&DDS4xAD9912, 1, fDDS1, FREP_STEP_SIZE);
							
							// adjust DDS3 to keep beatnote within the bandpass filter. prediction
							double fDDS3 = f0_DDS3 - Sign1 * Sign2 * N2/N1 * Ndiv * delta_f_lock_2;
							df_DDS3 = fDDS3 - DDS4xAD9912_GetFrequency(&DDS4xAD9912, 3);
							DDS4xAD9912_SetFrequency(&DDS4xAD9912, 3, fDDS3);

							// allow counter to settle
							settling = 3;
							
							// next step
							Measuring_2 += 1;
						}
						break;
						
					case N_MEASUREMENT_FREP_MINUS:
						// frep negative step
						
						if (settling-- > 0)
							break;
						
						if (t3 == 0.0)
							t3 = utc;

						f_rep_minus += Math1 + 250000000 - f_rep_slope * (utc - t2);
						f_beat_minus += Ch2 + f_beat_slope * (utc - t2);
						nobs += 1;

						if ((utc -t3) > DeltaT_2) {
							f_rep_minus = f_rep_minus / nobs;
							f_beat_minus = f_beat_minus / nobs;
							nobs = 0;

							// compute N2
							double delta_f_rep_m = f_rep_minus - f_rep_plus;
							double delta_f_rep = Sign1 * Ndiv * 2.0 * delta_f_lock_3 / N1;
							
							logmsg("delta frep: measured=%e expected=%e difference=%e",
								delta_f_rep_m, delta_f_rep, delta_f_rep_m - delta_f_rep);
							
							N_measured = -Sign2 * (df_DDS3 + f_beat_minus - f_beat_plus) / delta_f_rep;
							SetCtrlVal(CalcNPanel, CALCN_N, N_measured);
							
							// back to nominal frequency
							DDS4xAD9912_RampFrequency(&DDS4xAD9912, 1, f0_DDS1, FREP_STEP_SIZE);
							DDS4xAD9912_SetFrequency(&DDS4xAD9912, 2, f0_DDS2);
							DDS4xAD9912_SetFrequency(&DDS4xAD9912, 3, f0_DDS3);
							
							// done
							Measuring_2 = N_MEASUREMENT_NONE;
						}
						break;
				}
				
				switch (Measuring_3) {
					
					case N_MEASUREMENT_NONE:
						// not measuring N3
						break;
						
					case N_MEASUREMENT_INIT:
						// init
						
						// set DDS1 to nominal frequency
						DDS4xAD9912_SetFrequency(&DDS4xAD9912, 1, f0_DDS1);
						
						// record current DDS frequencies
						f0_DDS2 = DDS4xAD9912_GetFrequency(&DDS4xAD9912, 2);
						f0_DDS3 = DDS4xAD9912_GetFrequency(&DDS4xAD9912, 3);
						
						t1 = utc;
						t2 = t3 = 0.0;
						nobs = 0;
						stat_zero(&stat_math1);
						stat_zero(&stat_ch3);
						f_rep_plus = f_rep_minus = 0.0;
						f_beat_plus = f_beat_minus = 0.0;
						
						// next step
						Measuring_3 += 1;
						break;
						
					case N_MEASUREMENT_SLOPE:
						// slope measurement
						
						if (settling-- > 0)
							break;
						
						stat_accumulate(&stat_math1, Math1);
						stat_accumulate(&stat_ch3, Ch3);
						
						if (utc - t1 > SlopeTime3) {
							// slope measurement
							f_rep_slope = stat_math1.slope;
							f_beat_slope = stat_ch3.slope;
							
							logmsg("f_rep_slope=%e Hz/s", f_rep_slope);
							logmsg("f_beat_slope=%e Hz/s", f_rep_slope);
							
							// frep positive step
							DDS4xAD9912_RampFrequency(&DDS4xAD9912, 1, f0_DDS1 + delta_f_lock_3, FREP_STEP_SIZE);
							
							// adjust DDS3 to keep beatnote within the bandpass filter
							double fDDS3 = f0_DDS3 + Sign1 * Sign3 * N3/N1 * Ndiv * delta_f_lock_3;
							DDS4xAD9912_SetFrequency(&DDS4xAD9912, 3, fDDS3);
							
							// allow counter to settle
							settling = 3;
							
							// next step
							Measuring_3 += 1;
						}
						break;

					case N_MEASUREMENT_ADJUST_FREQ_PLUS:
					case N_MEASUREMENT_ADJUST_FREQ_MINUS:
						// adjust DDS frequency to keep beatnote within the bandpass filter

						if (settling-- > 0)
							break;
						
						// adjust DDS frequency to keep 55 MHz tracker oscillator locked
						double fDDS2 = DDS4xAD9912_GetFrequency(&DDS4xAD9912, 2) + 275000 - Ch4;
						DDS4xAD9912_SetFrequency(&DDS4xAD9912, 2, fDDS2);
						
						// allow counter to settle
						settling = 3;
						
						// next step
						Measuring_3 += 1;
						break;						
						
					case N_MEASUREMENT_FREP_PLUS:
						// frep positive step
						
						if (settling-- > 0)
							break;

						if (t2 == 0.0)
							t2 = utc;
						
						f_rep_plus += Math1 + 250000000 - f_rep_slope * (utc - t2);
						f_beat_plus += Ch3 - f_beat_slope * (utc - t2);
						nobs += 1;
						
						if (utc - t2 > DeltaT_3) {
							f_rep_plus = f_rep_plus / nobs;
							f_beat_plus = f_beat_plus / nobs;
							nobs = 0;
							
							// frep negative step
							DDS4xAD9912_RampFrequency(&DDS4xAD9912, 1, f0_DDS1 - delta_f_lock_3, FREP_STEP_SIZE);

							// adjust DDS3 to keep beatnote within the bandpass filter
							double fDDS3 = f0_DDS3 - Sign1 * Sign3 * N3/N1 * Ndiv * delta_f_lock_3;
							DDS4xAD9912_SetFrequency(&DDS4xAD9912, 3, fDDS3);
							
							// allow counter to settle
							settling = 3;
							
							// next step
							Measuring_3 += 1;
						}
						break;
					
					case N_MEASUREMENT_FREP_MINUS:
						// frep negative step
						
						if (settling-- > 0)
							break;
						
						if (t3 == 0.0)
							t3 = utc;
						
						f_rep_minus += Math1 + 250000000 - f_rep_slope * (utc - t2);
						f_beat_minus += Ch3 - f_beat_slope * (utc - t2);
						nobs += 1;
						
						if (utc - t3 > DeltaT_3) {
							f_rep_minus = f_rep_minus / nobs;
							f_beat_minus = f_beat_minus / nobs;
							nobs = 0;
							
							// check delta frep
							double delta_f_rep_m = f_rep_plus - f_rep_minus;
							double delta_f_rep = Sign1 * Ndiv * 2.0 * delta_f_lock_3 / N1;
							
							logmsg("delta frep: measured=%e expected=%e difference=%e",
								delta_f_rep_m, delta_f_rep, delta_f_rep_m - delta_f_rep);
							
							logmsg("f_beat_minus=%e", f_beat_minus);
							logmsg("f_beat_plus =%e", f_beat_plus);
							
							// compute N3
							double delta_f_beat = f_beat_plus - f_beat_minus + 2.0 * Sign1 * Sign3 * N3/N1 * Ndiv * delta_f_lock_3;
							double delta_f_beat_expected = delta_f_rep * N3;
							
							logmsg("delta fbeat: measured=%e expected=%e difference=%e",
								delta_f_beat, delta_f_beat_expected, delta_f_beat - delta_f_beat_expected);
							
							N_measured = delta_f_beat / delta_f_rep;
							SetCtrlVal(CalcNPanel, CALCN_N, N_measured);
							
							logmsg("measured N3=%.3f", N_measured);
							
							// back to nominal frep
							DDS4xAD9912_RampFrequency(&DDS4xAD9912, 1, f0_DDS1, FREP_STEP_SIZE);
							DDS4xAD9912_SetFrequency(&DDS4xAD9912, 2, f0_DDS2);
							DDS4xAD9912_SetFrequency(&DDS4xAD9912, 3, f0_DDS3);
							
							// done
							Measuring_3 = N_MEASUREMENT_NONE;
						}
						break;
				}
				
				// beatnote sign determination
				
				if (Getsign1 == TRUE) {
					if (utc > tbegin1+2) {
						if (Math1 > Frepbefore1)
							Sign1 = -1.0;
						else
							Sign1 = +1.0;
						DDS4xAD9912_SetFrequency(&DDS4xAD9912, 1, Frequency1);
						Getsign1 = FALSE;
						SetCtrlVal(MainPanel, PANEL_SIGN1, Sign1);
					}
				}
				if (Getsign2 == TRUE) {
					if (utc > tbegin2+2){
						if (Math1 > Frepbefore2) { 
							if (Ch2 > Ch2before)
								Sign2 = +1.0;
							else
								Sign2 = -1.0;
						} else {
							if (Ch2 > Ch2before)
								Sign2 = -1.0;
							else 
								Sign2 = +1.0;
						}
						DDS4xAD9912_SetFrequency(&DDS4xAD9912, 1, Frequency2);
						Getsign2 = FALSE;
						SetCtrlVal(MainPanel, PANEL_SIGN2, Sign2);
					}
				}
				if (Getsign3 == TRUE) {
					if (utc > tbegin3+2){
						if (Ch3 > Frepbefore3)
							Sign3 = -1.0;
						else
							Sign3 = +1.0;
						DDS4xAD9912_SetFrequency(&DDS4xAD9912, 4, Frequency3);
						Getsign3 = FALSE;
						SetCtrlVal(MainPanel, PANEL_SIGN3, Sign3);
					}
				}
				
				// select reference
				double f = 0.0;
				switch (dedrift.reference) {
					case DEDRIFT_REFERENCE_MICROWAVE:
						f = Math2;
						break;
					case DEDRIFT_REFERENCE_HG:
						f = Ch2 * 1062.5 / 1542.2;
						break;
				}
				
				// stop dedrift if the comb is not locked
				if ((dedrift.enabled)
					& (dedrift.threshold != 0.0)
					& (freq.previous != 0.0)
					& (fabs(f - freq.previous) > dedrift.threshold)) {
						
					if (! dedrift.keep_slope) {
						dedrift.applied = 0.0;
						DDSFox_SetSweepRate(&DDS1xAD9956, dedrift.applied);
						SetCtrlVal(MainPanel, PANEL_SLOPE_APPLIED, dedrift.applied);
					}
					if (! dedrift.keep_freq) {
						DDSFox_Set(&DDS1xAD9956, dedrift.freq0, dedrift.applied);
					}
					
					stat_zero(&freq);
					SetCtrlVal(MainPanel, PANEL_SLOPE_MEASURED, freq.slope);
					dedrift.enabled = FALSE;
					SetCtrlVal(MainPanel, PANEL_MEASURE_SLOPE, 0);
				}
				
				// dedrifting 
				if (dedrift.enabled)
				{
					// update slope measurement
					stat_accumulate(&freq, f);
					
					// update indicator
					SetCtrlVal(MainPanel, PANEL_SLOPE_MEASURED, freq.slope);
					
					// update applied slope
					if ((utc - dedrift.t0) > dedrift.interval) {
						
						if (dedrift.invert)
							dedrift.applied -= freq.slope;
						else
							dedrift.applied += freq.slope;
						
						SetCtrlVal(MainPanel, PANEL_SLOPE_APPLIED, dedrift.applied);
						
						if (dedrift.doubleslope)
							DDSFox_SetSweepRate(&DDS1xAD9956, dedrift.applied * 2.0);
						else
							DDSFox_SetSweepRate(&DDS1xAD9956, dedrift.applied);
						
						logmsg("dedrift update: adjustment=%+3e slope=%+3e", freq.slope, dedrift.applied);
						
						stat_zero(&freq);
						dedrift.t0 = utc;
					}
				}
				
				// recenter
				if (recenter.enabled)
				{
					rollmean_accumulate(&rollmean_ch2, Ch2);
					rollmean_accumulate(&rollmean_ch3, Ch3);
					rollmean_accumulate(&rollmean_ch4, Ch4);
					
					if ((utc - recenter.t0) > recenter.interval) {
		
						if (recenter.lo) {
							// adjust DDS2 frequency to keep Ch4 reading at 275 kHz
							double freq = DDS4xAD9912_GetFrequency(&DDS4xAD9912, 2);
							double adj = 275000.0 - rollmean_ch4.mean;
							freq = freq + adj;
							DDS4xAD9912_SetFrequency(&DDS4xAD9912, 2, freq);
							logmsg("recenter ch4 to 275 kHz: DDS2 adjustment=%+3e", adj);
						}
					
						if (recenter.hg) {
							// adjust DDS3 frequency to keep Ch2 reading at 10 kHz
							double freq = DDS4xAD9912_GetFrequency(&DDS4xAD9912, 3);
							double adj = 10000 - rollmean_ch2.mean;
							freq = freq + adj;
							DDS4xAD9912_SetFrequency(&DDS4xAD9912, 3, freq);
							logmsg("recenter Hg beatnote (ch2) to 10 kHz: DDS3 adjustment=%+3e", adj);
						}
					
						if (recenter.sr) {
							// adjust DDS3 frequency to keep Ch3 reading at 10 kHz
							double freq = DDS4xAD9912_GetFrequency(&DDS4xAD9912, 3);
							double adj = 10000 - rollmean_ch3.mean;
							freq = freq + adj;
							DDS4xAD9912_SetFrequency(&DDS4xAD9912, 3, freq);
							logmsg("recenter Sr beatnote (ch3) to 10 kHz: DDS3 adjustment=%+3e", adj);
						}
					
						recenter.t0 = utc;
						rollmean_zero(&rollmean_ch2);
						rollmean_zero(&rollmean_ch3);
						rollmean_zero(&rollmean_ch4);
					}
				}

				// update DDS frequencies display
				SetCtrlVal(MainPanel, PANEL_DDS1, DDS4xAD9912.frequency[0]);
				SetCtrlVal(MainPanel, PANEL_DDS2, DDS4xAD9912.frequency[1]);
				SetCtrlVal(MainPanel, PANEL_DDS3, DDS4xAD9912.frequency[2]);
				SetCtrlVal(MainPanel, PANEL_DDS4, DDS4xAD9912.frequency[3]);
				
				// local time
				struct tm *ltime = localtime(&event.time.tv_sec);
				// round to milliseconds
				int msec = round(event.time.tv_usec / 1000.0);
				while (msec >= 1000) {
					ltime->tm_sec += 1;
					msec -= 1000;
				}
				// format local time
				char timestr[24];
				int len = strftime(timestr, sizeof(timestr), "%d/%m/%Y %H:%M:%S", ltime);
				snprintf(timestr + len, sizeof(timestr) - len, ".%03d", msec);
				// display local time
				SetCtrlVal(MainPanel, PANEL_TIME, timestr);
				
				// run id derived from current local date in the form YYMMDD
				char id[7];
				strftime(id, sizeof(id), "%y%m%d", ltime);
				
				// write datafiles
				for (struct datafile *d = datafiles; d->data; d++)
					datafile_append(d, id, timestr);
				
				// send Sr frequency (Math4) to Sr data logger
				sr_datalogger_send(&datalogger, utc, Math4);
			}		
			break;
	}
}

int CVICALLBACK CB_OnFreqPlot (int panel, int control, int event,
		void *callbackData, int eventData1, int eventData2)
{
	switch (event)
	{
		case EVENT_COMMIT:
			for (struct plot *plot = plots; plot->data; plot++) {
				if (plot->control == control)
					plot_toggle(plot);
			}
			break;
	}
	return 0;
}

int CVICALLBACK CB_OnAllanPlot (int panel, int control, int event,
		void *callbackData, int eventData1, int eventData2)
{
	switch (event)
	{
		case EVENT_COMMIT:
			for (struct adev *adev = adevs; adev->data; adev++) {
				if (adev->control == control)
					adev_toggle(adev);
			}
			break;
	}
	return 0;
}

int  CVICALLBACK CB_ChangeDDSOut (int panel, int control, int event, 
		 void *callbackData, int eventData1, int eventData2)
{
	switch (event) {
		case EVENT_COMMIT:
			double frequency;
			GetCtrlVal(MainPanel, control, &frequency);
			switch (control) {
				case PANEL_DDS1:
					DDS4xAD9912_SetFrequency(&DDS4xAD9912, 1, frequency);
					break;
				case PANEL_DDS2:
					DDS4xAD9912_SetFrequency(&DDS4xAD9912, 2, frequency);
					break;
				case PANEL_DDS3:
					DDS4xAD9912_SetFrequency(&DDS4xAD9912, 3, frequency);
					break;
				case PANEL_DDS4:
					DDS4xAD9912_SetFrequency(&DDS4xAD9912, 4, frequency);
					break;
			}
			break;
	}
	return 0;
}

int  CVICALLBACK CB_ChangeDDSStep (int panel, int control, int event, 
		 void *callbackData, int eventData1, int eventData2)
{
	switch (event)
	{
		case EVENT_COMMIT:
			double step;
			GetCtrlVal(panel, control, &step);
			switch (control)
			{
				case PANEL_DDS1STEP:
					SetCtrlAttribute(panel, PANEL_DDS1, ATTR_INCR_VALUE, step);
					break;
				case PANEL_DDS2STEP:
					SetCtrlAttribute(panel, PANEL_DDS2, ATTR_INCR_VALUE, step);
					break;
				case PANEL_DDS3STEP:
					SetCtrlAttribute(panel, PANEL_DDS3, ATTR_INCR_VALUE, step);
					break;
				case PANEL_DDS4STEP:
					SetCtrlAttribute(panel, PANEL_DDS4, ATTR_INCR_VALUE, step);
					break;
			}
			break;
	}
	return 0;
}

int CVICALLBACK CB_ChangeMath (int panel, int control, int event,
		void *callbackData, int eventData1, int eventData2)
{
	int len;
	char *string;
		
	switch (event)
	{
		case EVENT_COMMIT:
			GetCtrlAttribute(panel, control, ATTR_STRING_TEXT_LENGTH, &len);
			string = (char *)malloc(sizeof(char) * (len + 1));
			GetCtrlVal(panel, control, string);
			switch (control) {
				case PANEL_MATHSTRING1:
					mupSetExpr(MathParser1, string);
					break;
				case PANEL_MATHSTRING2:
					mupSetExpr(MathParser2, string);
					break;
				case PANEL_MATHSTRING3:
					mupSetExpr(MathParser3, string);
					break;
				case PANEL_MATHSTRING4:
					mupSetExpr(MathParser4, string);
					break;
				case PANEL_MATHSTRING5:
					mupSetExpr(MathParser5, string);
					break;
			}
			free(string);
			break;
	}
	return 0;
}

int CVICALLBACK CB_ChangeN (int panel, int control, int event,
		void *callbackData, int eventData1, int eventData2)
{
	switch (event)
	{
		case EVENT_COMMIT:
			switch (control)
			{
				case PANEL_N1CHOICE:
					GetCtrlVal(panel, control, &N1);
					break;
				case PANEL_N2CHOICE:
					GetCtrlVal(panel, control, &N2);
					break;
				case PANEL_N3CHOICE:
					GetCtrlVal(panel, control, &N3);
					break;
			}
			break;
	}
	return 0;
}

int CVICALLBACK CB_OnPlus10k (int panel, int control, int event,
		void *callbackData, int eventData1, int eventData2)
{
	double Frequency ;

	switch (event)
	{
		case EVENT_COMMIT:
			switch (control)
			{
				case PANEL_PLUS10KDDS1:
					GetCtrlVal(MainPanel, PANEL_DDS1, &Frequency);
					Frequency += 10000.0;
					DDS4xAD9912_SetFrequency(&DDS4xAD9912, 1, Frequency);	
					SetCtrlVal(MainPanel, PANEL_DDS1, Frequency);
					break;
				case PANEL_PLUS10KDDS2:
					GetCtrlVal(MainPanel, PANEL_DDS2, &Frequency);
					Frequency += 10000.0;
					DDS4xAD9912_SetFrequency(&DDS4xAD9912, 2, Frequency);	
					SetCtrlVal(MainPanel, PANEL_DDS2, Frequency);
					break;
				case PANEL_PLUS10KDDS3:
					GetCtrlVal(MainPanel, PANEL_DDS3, &Frequency);
					Frequency += 10000.0;
					DDS4xAD9912_SetFrequency(&DDS4xAD9912, 3, Frequency);	
					SetCtrlVal(MainPanel, PANEL_DDS3, Frequency);
					break;
				case PANEL_PLUS10KDDS4:
					GetCtrlVal(MainPanel, PANEL_DDS4, &Frequency);
					Frequency += 10000.0;
					DDS4xAD9912_SetFrequency(&DDS4xAD9912, 4, Frequency);	
					SetCtrlVal(MainPanel, PANEL_DDS4, Frequency);
					break;
			}
			break;
	}
	return 0;
}

int CVICALLBACK CB_OnMinus10k (int panel, int control, int event,
		void *callbackData, int eventData1, int eventData2)
{
	double Frequency;
	
	switch (event)
	{
		case EVENT_COMMIT:
			switch (control)
			{
				case PANEL_MINUS10KDDS1:
					GetCtrlVal(MainPanel, PANEL_DDS1, &Frequency);
					Frequency -= 10000.0;
					DDS4xAD9912_SetFrequency(&DDS4xAD9912, 1, Frequency);
					SetCtrlVal(MainPanel, PANEL_DDS1, Frequency);
					break;
				case PANEL_MINUS10KDDS2:
					GetCtrlVal(MainPanel, PANEL_DDS2, &Frequency);
					Frequency -= 10000.0;
					DDS4xAD9912_SetFrequency(&DDS4xAD9912, 2, Frequency);	
					SetCtrlVal(MainPanel, PANEL_DDS2, Frequency);
					break;
				case PANEL_MINUS10KDDS3:
					GetCtrlVal(MainPanel, PANEL_DDS3, &Frequency);
					Frequency -= 10000.0;
					DDS4xAD9912_SetFrequency(&DDS4xAD9912, 3, Frequency);	
					SetCtrlVal(MainPanel, PANEL_DDS3, Frequency);
					break;
				case PANEL_MINUS10KDDS4:
					GetCtrlVal(MainPanel, PANEL_DDS4, &Frequency);
					Frequency -= 10000.0;
					DDS4xAD9912_SetFrequency(&DDS4xAD9912, 4, Frequency);
					SetCtrlVal(MainPanel, PANEL_DDS4, Frequency);
					break;
			}
			break;
	}
	return 0;
}

int CVICALLBACK CB_OnAcceptN (int panel, int control, int event,
		void *callbackData, int eventData1, int eventData2)
{
	int measure;
	
	switch (event) {
		case EVENT_COMMIT:
			GetPanelAttribute(panel, ATTR_CALLBACK_DATA, &measure);
			switch (measure) {
				case LO:
					N1 = round(N_measured);
					SetCtrlVal(MainPanel, PANEL_N1CHOICE, N1);
					break;
				case HG:
					N2 = round(N_measured);
					SetCtrlVal(MainPanel, PANEL_N2CHOICE, N2);
					break;
				case SR:
					N3 = round(N_measured);
					SetCtrlVal(MainPanel, PANEL_N3CHOICE, N3);
					break;
			} 
			break;
	}
	return 0;
}

int CVICALLBACK CB_OnNCalculus (int panel, int control, int event,
		void *callbackData, int eventData1, int eventData2)
{
	int visible;
	
	switch (event) {
		case EVENT_COMMIT:
			switch (control) {
				case PANEL_N1CALCULUS:
					GetPanelAttribute(CalcNPanel, ATTR_VISIBLE, &visible);
					if (! visible) {
						SetPanelAttribute(panel, ATTR_CALLBACK_DATA, LO);
						SetPanelAttribute(CalcNPanel, ATTR_TITLE, "Measure N_Lo");
						SetCtrlVal(CalcNPanel, CALCN_INTEGRATIONTIME, DeltaT_1);
						SetCtrlVal(CalcNPanel, CALCN_SLOPETIME, SlopeTime1);
						SetCtrlVal(CalcNPanel, CALCN_DELTAFREQ, delta_f_lock_1 / 1000.0);
						SetCtrlVal(CalcNPanel, CALCN_N, 0.0);
						DisplayPanel(CalcNPanel);
					}
					break;
				case PANEL_N2CALCULUS:
					GetPanelAttribute(CalcNPanel, ATTR_VISIBLE, &visible);
					if (! visible) {
						SetPanelAttribute(panel, ATTR_CALLBACK_DATA, HG);
						SetPanelAttribute(CalcNPanel, ATTR_TITLE, "Measure N_Hg");
						SetCtrlVal(CalcNPanel, CALCN_INTEGRATIONTIME, DeltaT_2);
						SetCtrlVal(CalcNPanel, CALCN_SLOPETIME, SlopeTime2);
						SetCtrlVal(CalcNPanel, CALCN_DELTAFREQ, delta_f_lock_2 / 1000.0);
						SetCtrlVal(CalcNPanel, CALCN_N, 0.0);
						DisplayPanel(CalcNPanel);
					} 
					break;
				case PANEL_N3CALCULUS:
					GetPanelAttribute(CalcNPanel, ATTR_VISIBLE, &visible);
					if (! visible) {
						SetPanelAttribute(panel, ATTR_CALLBACK_DATA, SR);
						SetPanelAttribute(CalcNPanel, ATTR_TITLE, "Measure N_Sr");
						SetCtrlVal(CalcNPanel, CALCN_INTEGRATIONTIME, DeltaT_3);
						SetCtrlVal(CalcNPanel, CALCN_SLOPETIME, SlopeTime3);
						SetCtrlVal(CalcNPanel, CALCN_DELTAFREQ, delta_f_lock_3 / 1000.0);
						SetCtrlVal(CalcNPanel, CALCN_N, 0.0);
						DisplayPanel(CalcNPanel);
					}
					break;
			}
			break;
	}
	return 0;
}

int CVICALLBACK CB_OnStartNCalculus (int panel, int control, int event,
		void *callbackData, int eventData1, int eventData2)
{
	int measuring;
	
	switch (event) {
		case EVENT_COMMIT:
			GetPanelAttribute(panel, ATTR_CALLBACK_DATA, &measuring);
			switch (measuring) {
				case LO:
					GetCtrlVal(CalcNPanel, CALCN_INTEGRATIONTIME, &DeltaT_1);
					GetCtrlVal(CalcNPanel, CALCN_SLOPETIME, &SlopeTime1);
					GetCtrlVal(CalcNPanel, CALCN_DELTAFREQ, &delta_f_lock_1);
					// convert from kHz to Hz
					delta_f_lock_1 = delta_f_lock_1 * 1000.0;
					Measuring_1 = TRUE;
					break;
				case HG:
					GetCtrlVal(CalcNPanel, CALCN_INTEGRATIONTIME, &DeltaT_2);
					GetCtrlVal(CalcNPanel, CALCN_SLOPETIME, &SlopeTime2);
					GetCtrlVal(CalcNPanel, CALCN_DELTAFREQ, &delta_f_lock_2);
					// convert from kHz to Hz
					delta_f_lock_2 = delta_f_lock_2 * 1000.0;
					Measuring_2 = TRUE;
					break;
				case SR:
					GetCtrlVal(CalcNPanel, CALCN_INTEGRATIONTIME, &DeltaT_3);
					GetCtrlVal(CalcNPanel, CALCN_SLOPETIME, &SlopeTime3);
					GetCtrlVal(CalcNPanel, CALCN_DELTAFREQ, &delta_f_lock_3);
					// convert from kHz to Hz
					delta_f_lock_3 = delta_f_lock_3 * 1000.0;
					Measuring_3 = TRUE;
					break;
			}
			break;
	}
	return 0;
}

int CVICALLBACK CB_OnNStop (int panel, int control, int event,
		void *callbackData, int eventData1, int eventData2)
{
	int measuring;
	
	switch (event) {
		case EVENT_COMMIT:
			HidePanel(CalcNPanel);
			GetPanelAttribute(panel, ATTR_CALLBACK_DATA, &measuring);
			switch (measuring) {
				case LO:
					Measuring_1 = FALSE;
					DDS4xAD9912_RampFrequency(&DDS4xAD9912, 1, f0_DDS1, FREP_STEP_SIZE);
					DDS4xAD9912_SetFrequency(&DDS4xAD9912, 2, f0_DDS2);
					break;
				case HG:
					Measuring_2 = FALSE;
					DDS4xAD9912_RampFrequency(&DDS4xAD9912, 1, f0_DDS1, FREP_STEP_SIZE);
					DDS4xAD9912_SetFrequency(&DDS4xAD9912, 2, f0_DDS2);
					DDS4xAD9912_SetFrequency(&DDS4xAD9912, 3, f0_DDS3);
					break;
				case SR:
					Measuring_3 = FALSE;
					DDS4xAD9912_RampFrequency(&DDS4xAD9912, 1, f0_DDS1, FREP_STEP_SIZE);
					DDS4xAD9912_SetFrequency(&DDS4xAD9912, 2, f0_DDS2);
					DDS4xAD9912_SetFrequency(&DDS4xAD9912, 3, f0_DDS3);
					break;
			}
			
			// update DDS frequencies display
			SetCtrlVal(MainPanel, PANEL_DDS1, DDS4xAD9912.frequency[0]);
			SetCtrlVal(MainPanel, PANEL_DDS2, DDS4xAD9912.frequency[1]);
			SetCtrlVal(MainPanel, PANEL_DDS3, DDS4xAD9912.frequency[2]);
			SetCtrlVal(MainPanel, PANEL_DDS4, DDS4xAD9912.frequency[3]);
			
			break;
	}
	return 0;
}

int  CVICALLBACK CB_OnFindSign (int panel, int control, int event, 
		void *callbackData, int eventData1, int eventData2)
{
	switch (event)
	{
		case EVENT_COMMIT:
			switch (control)
			{
				case PANEL_FINDSIGN1:
					tbegin1 = utc;
					Frepbefore1 = Math1;
					GetCtrlVal(MainPanel, PANEL_DDS1, &Frequency1) ;
					SetCtrlVal(MainPanel, PANEL_DDS1, Frequency1+Frequencystep1) ;  
					DDS4xAD9912_SetFrequency(&DDS4xAD9912, 1, Frequency1+Frequencystep1);
					Getsign1 = TRUE;
					break;
				case PANEL_FINDSIGN2:
					tbegin2 = utc;
					Frepbefore2 = Math1;
					Ch2before = Ch2;
					GetCtrlVal(MainPanel, PANEL_DDS1, &Frequency2) ;
					SetCtrlVal(MainPanel, PANEL_DDS1, Frequency2+Frequencystep2) ;
					DDS4xAD9912_SetFrequency(&DDS4xAD9912, 1, Frequency2+Frequencystep2);
					Getsign2 = TRUE;
					break;
				case PANEL_FINDSIGN3:
					tbegin3 = utc;
					Frepbefore3 = Math1;
					GetCtrlVal(MainPanel, PANEL_DDS4, &Frequency3) ;
					SetCtrlVal(MainPanel, PANEL_DDS4, Frequency3+Frequencystep3) ; 
					DDS4xAD9912_SetFrequency(&DDS4xAD9912, 4, Frequency3+Frequencystep3);
					Getsign3 = TRUE;
					break;
			}
			break;
	}
	return 0;
}

int  CVICALLBACK CB_OnFind275K (int panel, int control, int event, 
		 void *callbackData, int eventData1, int eventData2)
{
	double frequency;
	
	switch (event)
	{
		case EVENT_COMMIT:
			switch (control)
			{
				case PANEL_FIND275K2:
					GetCtrlVal(MainPanel, PANEL_DDS2, &frequency);
					frequency = frequency + 275000 - Ch4;
					SetCtrlVal(MainPanel, PANEL_DDS2, frequency) ;  
					DDS4xAD9912_SetFrequency(&DDS4xAD9912, 2, frequency);
					break;
					 
				case PANEL_FIND10K3:
					GetCtrlVal(MainPanel, PANEL_DDS3, &frequency);
					frequency = frequency + 10000 - Ch2;
					SetCtrlVal(MainPanel, PANEL_DDS3, frequency);
					DDS4xAD9912_SetFrequency(&DDS4xAD9912, 3, frequency);
					break;
			}
			break;
	}
	return 0;
}

int  CVICALLBACK CB_OnChangeNdiv (int panel, int control, int event, 
		 void *callbackData, int eventData1, int eventData2)
{
	switch (event)
	{
		case EVENT_COMMIT:
			GetCtrlVal(MainPanel, PANEL_CHANGENDIV, &Ndiv);
			f0_DDS1 = 880000000.0 / Ndiv;
			SetCtrlVal(MainPanel, PANEL_DDS1, f0_DDS1);
			DDS4xAD9912_SetFrequency(&DDS4xAD9912, 1, f0_DDS1);
			break;
	}
	return 0;
}

int  CVICALLBACK CB_MeasureSlope (int panel, int control, int event, 
		 void *callbackData, int eventData1, int eventData2)
{
	switch (event)
	{
		case EVENT_COMMIT:
			GetCtrlVal(panel, control, &dedrift.enabled);
			if (dedrift.enabled) {
				dedrift.t0 = utc;
				stat_zero(&freq);
				logmsg("dedrift start");
			} else {
				if (! dedrift.keep_slope) {
					dedrift.applied = 0.0;
					DDSFox_SetSweepRate(&DDS1xAD9956, dedrift.applied);
					SetCtrlVal(MainPanel, PANEL_SLOPE_APPLIED, dedrift.applied);
				}
				if (! dedrift.keep_freq) {
					DDSFox_Set(&DDS1xAD9956, dedrift.freq0, dedrift.applied);
				}
				stat_zero(&freq);
				SetCtrlVal(panel, PANEL_SLOPE_MEASURED, freq.slope);
				logmsg("dedrift stop");
			}
			break;
	}
	return 0;
}

int  CVICALLBACK CB_OnResetSlope (int panel, int control, int event, 
		void *callbackData, int eventData1, int eventData2)
{
	switch (event)
	{
		case EVENT_COMMIT:
			dedrift.applied = 0.0; 
			SetCtrlVal(panel, PANEL_SLOPE_APPLIED, dedrift.applied);
			DDSFox_Set(&DDS1xAD9956, dedrift.freq0, dedrift.applied);
			logmsg("dedrift reset");
			break;
	}
	return 0;
}
  
int  CVICALLBACK CB_ChangeSlopeTime (int panel, int control, int event, 
		void *callbackData, int eventData1, int eventData2)
{
	switch (event)
	{
		case EVENT_COMMIT:
			GetCtrlVal(MainPanel, PANEL_SLOPETIME, &dedrift.interval); 
			break;
	}
	return 0;
}

int  CVICALLBACK CB_OnCROX (int panel, int control, int event, 
		 void *callbackData, int eventData1, int eventData2)
{
	switch (event)
	{
		case EVENT_COMMIT:
			switch (control) {
				case PANEL_CHECKBOX_KEEP:
					// keep current dedrifting frequency when dedrifting is disabled
				   	GetCtrlVal(MainPanel, PANEL_CHECKBOX_KEEP, &dedrift.keep_freq);
					break;
				case PANEL_CHECKBOX_KEEPSLOPE:
					// keep current dedrifting slope when dedrifting is disabled
				   	GetCtrlVal(MainPanel, PANEL_CHECKBOX_KEEPSLOPE, &dedrift.keep_slope);
					break;
			}
 			break;
	}
	return 0;
}

int  CVICALLBACK CB_RecenterEnable (int panel, int control, int event, 
		 void *callbackData, int eventData1, int eventData2)
{
	switch (event)
	{
		case EVENT_COMMIT:
			GetCtrlVal(panel, control, &recenter.enabled);
			recenter.t0 = utc;
			rollmean_zero(&rollmean_ch2);
			rollmean_zero(&rollmean_ch3);
			rollmean_zero(&rollmean_ch4);
 			break;
	}
	return 0;
}

int  CVICALLBACK CB_OnStopSlopeCancellingOnUnlocked (int panel, int control, int event, 
		 void *callbackData, int eventData1, int eventData2)
{
	int value;
	switch (event)
	{
		case EVENT_COMMIT:
			GetCtrlVal(MainPanel, PANEL_CHECKBOX_STOPIFAUTODE, &value);
			dedrift.threshold = value ? 100.0 : 0.0;
			break;
	}
	return 0;
}

int CVICALLBACK CB_OnSlopeReference (int panel, int control, int event,
		void *callbackData, int eventData1, int eventData2)
{
	switch (event)
	{
		case EVENT_COMMIT:
			GetCtrlVal(MainPanel, PANEL_SLOPE_REFERENCE, &dedrift.reference);
			break;
	}
	return 0;
}

int CVICALLBACK CB_OnEstimateN (int panel, int control, int event,
		void *callbackData, int eventData1, int eventData2)
{
	int visible;
	
	switch (event)
	{
		case EVENT_COMMIT:
			GetPanelAttribute(EstimateNPanel, ATTR_VISIBLE , &visible);
			if (! visible)
				DisplayPanel(EstimateNPanel);
			// reset N estimate
			SetCtrlVal(EstimateNPanel, ESTIMATEN_N, 0.0);
			// set current frep
			SetCtrlVal(EstimateNPanel, ESTIMATEN_FREP, 250e6 + Math1);
			switch (control) {
				case PANEL_ESTIMATE_N2:
					SetCtrlVal(EstimateNPanel, ESTIMATEN_WAVELENGTH, HG_WAVELENGTH);
					SetPanelAttribute(panel, ATTR_TITLE, "Estimate N_Hg");
					SetPanelAttribute(panel, ATTR_CALLBACK_DATA, HG);
					break;
				case PANEL_ESTIMATE_N3:
					SetCtrlVal(EstimateNPanel, ESTIMATEN_WAVELENGTH, SR_WAVELENGTH);
					SetPanelAttribute(panel, ATTR_TITLE, "Estimate N_Sr");
					SetPanelAttribute(panel, ATTR_CALLBACK_DATA, SR);
					break;
			}
			break;
	}
	return 0;
}			

int CVICALLBACK CB_OnNEstimateCancel (int panel, int control, int event,
		void *callbackData, int eventData1, int eventData2)
{
	int visible;
	
	switch (event)
	{
		case EVENT_COMMIT:
			GetPanelAttribute(panel, ATTR_VISIBLE, &visible);
			if (visible)
				HidePanel(panel);
			break;
	}
	return 0;
}

int CVICALLBACK CB_OnNEstimateSet (int panel, int control, int event,
		void *callbackData, int eventData1, int eventData2)
{
	int estimate;
	
	switch (event)
	{
		case EVENT_COMMIT:
			GetPanelAttribute(panel, ATTR_CALLBACK_DATA, &estimate);
			switch (estimate) {
				case HG:
					GetCtrlVal(panel, ESTIMATEN_N, &N2);
					SetCtrlVal(MainPanel, PANEL_N3CHOICE, N2);
					break;
				case SR:
					GetCtrlVal(panel, ESTIMATEN_N, &N3);
					SetCtrlVal(MainPanel, PANEL_N3CHOICE, N3);
					break;
			}
			HidePanel(panel);
			break;
	}
	return 0;
}

int CVICALLBACK CB_OnNEstimate (int panel, int control, int event,
		void *callbackData, int eventData1, int eventData2)
{
	double frep, wl, N;
	
	switch (event)
	{
		case EVENT_COMMIT:
			GetCtrlVal(panel, ESTIMATEN_FREP, &frep);
			GetCtrlVal(panel, ESTIMATEN_WAVELENGTH, &wl);
			N = round(SPEED_OF_LIGHT / wl / 1e-9 / frep);
			SetCtrlVal(panel, ESTIMATEN_N, N);
			break;
	}
	return 0;
}

int CVICALLBACK CB_SetSlope (int panel, int control, int event,
		void *callbackData, int eventData1, int eventData2)
{
	switch (event)
	{
		case EVENT_COMMIT:
			GetCtrlVal(panel, control, &dedrift.applied);
			DDSFox_SetSweepRate(&DDS1xAD9956, dedrift.applied);
			break;
	}
	return 0;
}

int CVICALLBACK CB_InvertSlopeSign (int panel, int control, int event,
		void *callbackData, int eventData1, int eventData2)
{
	switch (event)
	{
		case EVENT_COMMIT:
			GetCtrlVal(panel, control, &dedrift.invert);
			break;
	}
	return 0;
}

int CVICALLBACK CB_ResetDedriftDDS (int panel, int control, int event,
		void *callbackData, int eventData1, int eventData2)
{
	switch (event)
	{
		case EVENT_COMMIT:
			// stop slope measurement and reset slope 
			dedrift.enabled = FALSE;
			SetCtrlVal(panel, PANEL_MEASURE_SLOPE, 0);
			dedrift.applied = 0.0;
			SetCtrlVal(panel, PANEL_SLOPE_APPLIED, dedrift.applied);
			// reset DDS
			DDSFox_Reset(&DDS1xAD9956);
			DDSFox_SetProfile(&DDS1xAD9956);
			DDSFox_SetDiv(&DDS1xAD9956, 1);
			DDSFox_Set(&DDS1xAD9956, dedrift.freq0, 0.0);
			break;
	}
	return 0;
}

int CVICALLBACK CB_ShowLog (int panel, int control, int event,
		void *callbackData, int eventData1, int eventData2)
{
	int visible;
	switch (event)
	{
		case EVENT_COMMIT:
			GetCtrlVal(panel, PANEL_SHOWLOG, &visible);
			logger_panel_visible(visible);
			break;
	}
	return 0;
}

int CVICALLBACK CB_OnLoggingPanelEvent(int panel, int event,
		void *callbackData, int eventData1, int eventData2)
{
	switch (event)
	{
		case EVENT_CLOSE:
			logger_panel_visible(0);
			SetCtrlVal(MainPanel, PANEL_SHOWLOG, 0);
			break;
	}
	return 0;
}

int CVICALLBACK CB_Sign3 (int panel, int control, int event,
		void *callbackData, int eventData1, int eventData2)
{
	switch (event)
	{
		case EVENT_COMMIT:
			GetCtrlVal(panel, control, &Sign3);
			break;
	}
	return 0;
}

int CVICALLBACK CB_SlopeX2 (int panel, int control, int event,
		void *callbackData, int eventData1, int eventData2)
{
	switch (event)
	{
		case EVENT_COMMIT:
			GetCtrlVal(panel, control, &dedrift.doubleslope);
			break;
	}
	return 0;
}

int CVICALLBACK CB_SaveData (int panel, int control, int event,
		void *callbackData, int eventData1, int eventData2)
{
	switch (event)
	{
		case EVENT_COMMIT:
			for (struct datafile *d = datafiles; d->data; d++) {
				if (d->control == control)
					GetCtrlVal(panel, control, &(d->write));
			}
			break;
	}
	return 0;
}


int CVICALLBACK CB_RecenterInterval (int panel, int control, int event,
		void *callbackData, int eventData1, int eventData2)
{
	switch (event)
	{
		case EVENT_COMMIT:
			GetCtrlVal(panel, control, &recenter.interval);
			break;
	}
	return 0;
}

int CVICALLBACK CB_RecenterChannel (int panel, int control, int event,
		void *callbackData, int eventData1, int eventData2)
{
	switch (event)
	{
		case EVENT_COMMIT:
			switch (control)
			{
				case PANEL_RECENTER_LO:
					GetCtrlVal(panel, control, &recenter.lo);
					break;
				case PANEL_RECENTER_HG:
					GetCtrlVal(panel, control, &recenter.hg);
					break;
				case PANEL_RECENTER_SR:
					GetCtrlVal(panel, control, &recenter.sr);
					break;
			}
			break;
	}
	return 0;
}

int CVICALLBACK CB_SrDatalogger (int panel, int control, int event,
		void *callbackData, int eventData1, int eventData2)
{
	switch (event)
	{
		case EVENT_COMMIT:
			GetCtrlVal(panel, control, &datalogger.enabled);
			break;
	}
	return 0;
}
int CVICALLBACK CB_DedriftDDSFreq (int panel, int control, int event,
		void *callbackData, int eventData1, int eventData2)
{
	switch (event)
	{
		case EVENT_COMMIT:
			GetCtrlVal(panel, control, &dedrift.freq0);
			DDSFox_Set(&DDS1xAD9956, dedrift.freq0, dedrift.applied);
			break;
	}
	return 0;
}