/*
 *  Hamlib Uniden backend - main file
 *  Copyright (c) 2001 by Stephane Fillod
 *
 *		$Id: uniden.c,v 1.1 2001-07-14 16:45:40 f4cfe Exp $
 *
 *   This library is free software; you can redistribute it and/or modify
 *   it under the terms of the GNU Library General Public License as
 *   published by the Free Software Foundation; either version 2 of
 *   the License, or (at your option) any later version.
 *
 *   This program is distributed in the hope that it will be useful,
 *   but WITHOUT ANY WARRANTY; without even the implied warranty of
 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *   GNU Library General Public License for more details.
 *
 *   You should have received a copy of the GNU Library General Public
 *   License along with this library; if not, write to the Free Software
 *   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 *
 */

#ifdef HAVE_CONFIG_H
#include "config.h"
#endif

#include <stdlib.h>
#include <stdio.h>   /* Standard input/output definitions */
#include <string.h>  /* String function definitions */
#include <unistd.h>  /* UNIX standard function definitions */
#include <fcntl.h>   /* File control definitions */
#include <errno.h>   /* Error number definitions */
#include <termios.h> /* POSIX terminal control definitions */
#include <sys/ioctl.h>
#include <math.h>

#if defined(__CYGWIN__)
#  undef HAMLIB_DLL
#  include <hamlib/rig.h>
#  include <serial.h>
#  include <misc.h>
#  define HAMLIB_DLL
#  include <hamlib/rig_dll.h>
#else
#  include <hamlib/rig.h>
#  include <serial.h>
#  include <misc.h>
#endif

#include "uniden.h"

/*
 * Uniden backend: should work for BC895xlt, also for BC235xlt
 * and most probably for the RadioShack PRO-2042, which is RadioShack's
 * version of the Uniden BC235xlt.
 * Protocol information available at http://www.cantonmaine.com/pro2052.htm
 *
 * It seems like this rig has no VFO, I mean only mem channels.
 * Is that correct? --SF
 */

#define EOM "\r"


/*
 * uniden_transaction
 * We assume that rig!=NULL, rig->state!= NULL, data!=NULL, data_len!=NULL
 * Otherwise, you'll get a nice seg fault. You've been warned!
 */
int uniden_transaction(RIG *rig, const char *cmd, int cmd_len, char *data, int *data_len)
{
	int i, count, retval;
	struct rig_state *rs;

	rs = &rig->state;

	retval = write_block(&rs->rigport, cmd, cmd_len);
	if (retval != RIG_OK)
		return retval;


	/* no data expected, TODO: flush input? */
	if (!data || !data_len)
			return 0;
	/*
	 * buffered read are quite helpful here!
	 * However, an automate with a state model would be more efficient..
	 *
	 * FIXME: should read until CR or LF?
	 */
	i = 0;
	do {
		count = fread_block(&rs->rigport, data+i, 1);
		if (count > 0)
				i += count;
		else if (count < 0)
				return count;
	} while (count > 0);

	*data_len = i;

	return RIG_OK;
}

/*
 * uniden_set_freq
 * Assumes rig!=NULL
 */
int uniden_set_freq(RIG *rig, vfo_t vfo, freq_t freq)
{
		char freqbuf[16];
		int freq_len;

		/* max 8 digits */
		if (freq >= GHz(1))
				return -RIG_EINVAL;

		/* exactly 8 digits */
		freq_len = sprintf(freqbuf, "RF%08Ld" EOM, freq);

		return uniden_transaction (rig, freqbuf, freq_len, NULL, NULL);
}

/*
 * uniden_set_mem
 * Assumes rig!=NULL
 */
int uniden_set_mem(RIG *rig, vfo_t vfo, int ch)
{
		char cmdbuf[16];
		int cmd_len;

		cmd_len = sprintf(cmdbuf, "MA%03d" EOM, ch);

		return uniden_transaction (rig, cmdbuf, cmd_len, NULL, NULL);
}

/*
 * init_uniden is called by rig_backend_load
 */
int init_uniden(void *be_handle)
{
		rig_debug(RIG_DEBUG_VERBOSE, "uniden: _init called\n");

		rig_register(&bc895_caps);

		return RIG_OK;
}