#ifdef _CVI_
#include <ansi_c.h>
#include <toolbox.h>
#define usleep(t) Delay((t) / 1000000.0)
#else
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#endif

#include "dds.h"
#include "xsocket.h"
#include "ad9912.h"


int ad9912_init(struct ad9912 *d, const char *hostname, double clock)
{
	int r;
	char buffer[256];

	d->clock = clock;
	d->sock = xsocket(hostname, 1234);
	
 	r = xconnect(d->sock);
	if (r < 0)
		return r;

	/* check compatibility */
	r = xask(d->sock, "REVISION", strlen("REVISION"), buffer, sizeof(buffer));
	if (r < 0)
		return r;
	if (atoi(buffer) != REVISION)
		return -1;

	return 0;
}


int ad9912_set_frequency(struct ad9912 *d, unsigned channel, double f)
{
	int r;
	uint64 value = ftw(d->clock, f);
	
	/* ad9912 ignores ftw last bit */
	value = value & ~1ULL;

	r = xcommand(d->sock, "SET CH%d:FTW0 0x%llX", channel, value);
	if (r < 0)
		return r;

	d->frequency[channel] = freq(d->clock, value);
     
	return 0;
}


int ad9912_get_frequency(struct ad9912 *d, unsigned channel, double *f)
{
	int r, n;
	uint64 value;
	char buffer[256];

	n = snprintf(buffer, sizeof(buffer), "GET CH%d:FTW0", channel);
	r = xask(d->sock, buffer, n, buffer, sizeof(buffer));
	if (r < 0)
		return r;

	r = strtouint64(buffer, &value);
	if (r < 0)
		return r;

	d->frequency[channel] = freq(d->clock, value);
	if (f)
		*f = d->frequency[channel];

	return 0;
}


/**
 * Ramp DDS frequency from @f1 to @f2 in steps @fstep with 0.01
 * seconds delay after each step.
 */
int ad9912_ramp_frequency2(struct ad9912 *d, unsigned channel, double f1, double f2, double fstep)
{
	int r = 0;
	const int delay = 10000;
	
	/* f2 > f1 */
	while ((f2 - f1) > fstep) {
		f1 += fstep;
		r = ad9912_set_frequency(d, channel, f1);
		if (r < 0)
			return r;
		usleep(delay);
	}
	
	/* f2 < f1 */
	while ((f1 - f2) > fstep) {
		f1 -= fstep;
		r = ad9912_set_frequency(d, channel, f1);
		if (r < 0)
			return r;
		usleep(delay);
	}
	
	/* final adjustment */
	return ad9912_set_frequency(d, channel, f2);
}


int ad9912_ramp_frequency(struct ad9912 *d, unsigned channel, double f, double fstep)
{
	return ad9912_ramp_frequency2(d, channel, d->frequency[channel], f, fstep);
}