/*
* hamlib - (C) Frank Singleton 2000 (javabear at users.sourceforge.net)
*
* ft900.c - (C) Frank Singleton 2000 (javabear at users.sourceforge.net)
*           (C) Stephane Fillod 2002-2005 (fillods at users.sourceforge.net)
*           (C) Nate Bargmann 2002, 2003 (n0nb at arrl.net)
*
* This shared library provides an API for communicating
* via serial interface to an FT-900 using the "CAT" interface
*
*
*   This library is free software; you can redistribute it and/or
*   modify it under the terms of the GNU Lesser General Public
*   License as published by the Free Software Foundation; either
*   version 2.1 of the License, or (at your option) any later version.
*
*   This library 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
*   Lesser General Public License for more details.
*
*   You should have received a copy of the GNU Lesser General Public
*   License along with this library; if not, write to the Free Software
*   Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
*
*/

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

#include <stdlib.h>
#include <string.h>  /* String function definitions */
#include <unistd.h>  /* UNIX standard function definitions */

#include "hamlib/rig.h"
#include "bandplan.h"
#include "serial.h"
#include "misc.h"
#include "cal.h"
#include "yaesu.h"
#include "ft900.h"


/*
 * Functions considered to be Beta code (2003-04-11):
 * set_freq
 * get_freq
 * set_mode
 * get_mode
 * set_vfo
 * get_vfo
 * set_ptt
 * get_ptt
 * set_split
 * get_split
 * set_rit
 * get_rit
 * set_func
 * get_func
 * get_level
 *
 * Functions considered to be Alpha code (2003-04-11):
 * vfo_op
 *
 * functions not yet implemented (2003-04-11):
 * set_split_freq
 * get_split_freq
 * set_split_mode
 * get_split_mode
 *
 */

/*
 * Native FT900 functions. More to come :-)
 *
 */

enum ft900_native_cmd_e {
  FT900_NATIVE_SPLIT_OFF = 0,
  FT900_NATIVE_SPLIT_ON,
  FT900_NATIVE_RECALL_MEM,
  FT900_NATIVE_VFO_TO_MEM,
  FT900_NATIVE_VFO_A,
  FT900_NATIVE_VFO_B,
  FT900_NATIVE_MEM_TO_VFO,
  FT900_NATIVE_CLARIFIER_OPS,
  FT900_NATIVE_FREQ_SET,
  FT900_NATIVE_MODE_SET,
  FT900_NATIVE_PACING,
  FT900_NATIVE_PTT_OFF,
  FT900_NATIVE_PTT_ON,
  FT900_NATIVE_MEM_CHNL,
  FT900_NATIVE_OP_DATA,
  FT900_NATIVE_VFO_DATA,
  FT900_NATIVE_MEM_CHNL_DATA,
  FT900_NATIVE_TUNER_OFF,
  FT900_NATIVE_TUNER_ON,
  FT900_NATIVE_TUNER_START,
  FT900_NATIVE_READ_METER,
  FT900_NATIVE_READ_FLAGS,
  FT900_NATIVE_SIZE             /* end marker, value indicates number of */
				                /* native cmd entries */
};

typedef enum ft900_native_cmd_e ft900_native_cmd_t;


/*
 * Internal MODES - when setting modes via FT900_NATIVE_MODE_SET
 *
 */

#define MODE_SET_LSB    0x00
#define MODE_SET_USB    0x01
#define MODE_SET_CW_W   0x02
#define MODE_SET_CW_N   0x03
#define MODE_SET_AM_W   0x04
#define MODE_SET_AM_N   0x05
#define MODE_SET_FM     0x06


/*
 * Internal Clarifier parms - when setting clarifier via
 * FT900_NATIVE_CLARIFIER_OPS
 *
 * The manual seems to be incorrect with regard to P1 and P2 values
 * P1 = 0x00    clarifier off
 * P1 = 0x01    clarifier on
 * P1 = 0xff    clarifier set
 * P2 = 0x00    clarifier up
 * P2 = 0xff    clarifier down
 */

/* P1 values */
#define CLAR_RX_OFF     0x00
#define CLAR_RX_ON      0x01
#define CLAR_SET_FREQ   0xff

/* P2 values */
#define CLAR_OFFSET_PLUS    0x00
#define CLAR_OFFSET_MINUS   0xff


/*
 * Some useful offsets in the status update flags (offset)
 * SUMO--Status Update Memory Offset?
 *
 * SF_ bit tests are now grouped with flag bytes for ease of reference
 *
 * FIXME: complete flags and bits
 *
 * CAT command 0xFA requests the FT-900 to return its status flags.
 * These flags consist of 3 bytes (plus 2 filler bytes) and are documented
 * in the FT-900 manual on page 33.
 *
 */

#define FT900_SUMO_DISPLAYED_STATUS_0   0x00    /* Status flag byte 0 */
#define SF_GC       (1<<1)              /* General Coverage Reception selected */
#define SF_SPLIT    (1<<2)              /* Split active */
#define SF_MCK      (1<<3)              /* memory Checking in progress */
#define SF_MT       (1<<4)              /* Memory Tuning in progress */
#define SF_MR       (1<<5)              /* Memory Mode selected */
#define SF_A        (0<<6)              /* bit 6 clear, VFO A */
#define SF_B        (1<<6)              /* bit 6 set, VFO B */
#define SF_VFO      (1<<7)              /* bit 7 set, VFO A or B active */

#define SF_VFOA     (SF_VFO|SF_A)       /* bit 7 set, bit 6 clear, VFO A */
#define SF_VFOB     (SF_VFO|SF_B)       /* bit 7 set, bit 6 set, VFO B */
#define SF_VFO_MASK (SF_VFOB)           /* bits 6 and 7 */
#define SF_MEM_MASK (SF_MCK|SF_MT|SF_MR)    /* bits 3, 4 and 5 */


#define FT900_SUMO_DISPLAYED_STATUS_1   0x01    /* Status flag byte 1 */


#define FT900_SUMO_DISPLAYED_STATUS_2   0x02    /* Status flag byte 1 */
#define SF_PTT_OFF  (0<<7)              /* bit 7 set, PTT open */
#define SF_PTT_ON   (1<<7)              /* bit 7 set, PTT closed */
#define SF_PTT_MASK (SF_PTT_ON)


/*
 * Offsets for VFO record retrieved via 0x10 P1 = 02, 03, 04
 *
 * The FT-900 returns frequency and mode data via three separate commands.
 * CAT command 0x10, P1 = 02 returns the current main and sub displays' data (19 bytes)
 * CAT command 0x10, P1 = 03 returns VFO A & B data  (18 bytes)
 * CAT command 0x10, P1 = 04, P4 = 0x01-0x20 returns memory channel data (19 bytes)
 * In all cases the format is (from the FT-900 manual page 32):
 *
 * Offset       Value
 * 0x00         Band Selection          (BPF selection: 0x00 - 0x30 (bit 7 =1 on a blanked memory))
 * 0x01         Operating Frequency     (Hex value of display--Not BCD!)
 * 0x04         Clarifier Offset        (signed value between -999d (0xfc19) and +999d (0x03e7))
 * 0x06         Mode Data
 * 0x07         CTCSS tone code         (0x00 - 0x20)
 * 0x08         Flags                   (Operating flags -- manual page 33)
 *
 * Memory Channel data has the same layout and offsets as the operating
 * data record.
 * When either of the 19 byte records is read (P1 = 02, 04), the offset is
 * +1 as the leading byte is the memory channel number.
 * The VFO data command (P1 = 03) returns 18 bytes and the VFO B data has
 * the same layout, but the offset starts at 0x09 and continues through 0x12
 *
 */

#define FT900_SUMO_MEM_CHANNEL          0x00    /* Memory Channel from 0xfa, P1 = 1 */
#define FT900_SUMO_DISPLAYED_FREQ       0x02    /* Current main display, can be VFO A, Memory data, Memory tune (3 bytes) */
#define FT900_SUMO_DISPLAYED_CLAR       0x05    /* RIT offset -- current display */
#define FT900_SUMO_DISPLAYED_MODE       0x07    /* Current main display mode */
#define FT900_SUMO_DISPLAYED_FLAG       0x09

#define FT900_SUMO_VFO_A_FREQ           0x01    /* VFO A frequency, not necessarily currently displayed! */
#define FT900_SUMO_VFO_A_CLAR           0x04    /* RIT offset -- VFO A */
#define FT900_SUMO_VFO_A_MODE           0x06    /* VFO A mode, not necessarily currently displayed! */
#define FT900_SUMO_VFO_A_FLAG           0x08

#define FT900_SUMO_VFO_B_FREQ           0x0a    /* Current sub display && VFO B */
#define FT900_SUMO_VFO_B_CLAR           0x0d    /* RIT offset -- VFO B */
#define FT900_SUMO_VFO_B_MODE           0x0f    /* Current sub display && VFO B */
#define FT900_SUMO_VFO_B_FLAG           0x11


/*
 * Read meter offset
 *
 * FT-900 returns the level of the S meter when in RX and ALC or PO or SWR
 * when in TX.  The level is replicated in the first four bytes sent by the
 * rig with the final byte being a constant 0xf7
 *
 * The manual states that the returned value will range between 0x00 and 0xff
 * while "in practice the highest value returned will be around 0xf0".  The
 * manual is silent when this value is returned as my rig returns 0x00 for
 * S0, 0x44 for S9 and 0x9D for S9 +60.
 *
 */

#define FT900_SUMO_METER                0x00    /* Meter level */


/*
 * Narrow filter selection flag from offset 0x08 or 0x11
 * in VFO/Memory Record
 *
 * used when READING modes from FT-900
 *
 */

#define FLAG_AM_N   (1<<6)
#define FLAG_CW_N   (1<<7)
#define FLAG_MASK   (FLAG_AM_N|FLAG_CW_N)


/*
 * Mode Bitmap from offset 0x06 or 0x0f in VFO/Memory Record.
 *
 * used when READING modes from FT-900
 *
 */

#define MODE_LSB     0x00
#define MODE_USB     0x01
#define MODE_CW      0x02
#define MODE_AM      0x03
#define MODE_FM      0x04

/* All relevant bits */
#define MODE_MASK   (MODE_LSB|MODE_USB|MODE_CW|MODE_AM|MODE_FM)


/*
 * Command string parameter offsets
 */

#define P1  3
#define P2  2
#define P3  1
#define P4  0

/*
 * Two calibration sets for the smeter/power readings
 */

#define FT900_STR_CAL_SMETER { 3, \
        { \
                {   0, -54 }, /* S0    */ \
                {0x44,   0 }, /* S9    */ \
                {0x9d,  60 }, /* +60dB */ \
        } }

#define FT900_STR_CAL_POWER { 5, \
        { \
                {   0,   0 }, /*  0W  */ \
                {0x44,  10 }, /* 10W  */ \
                {0x69,  25 }, /* 25W  */ \
                {0x92,  50 }, /* 50W  */ \
                {0xCE, 100 }, /* 100W */ \
        } }

/*
 * API local implementation
 *
 */

static int ft900_init(RIG *rig);
static int ft900_cleanup(RIG *rig);
static int ft900_open(RIG *rig);
static int ft900_close(RIG *rig);

static int ft900_set_freq(RIG *rig, vfo_t vfo, freq_t freq);
static int ft900_get_freq(RIG *rig, vfo_t vfo, freq_t *freq);

static int ft900_set_mode(RIG *rig, vfo_t vfo, rmode_t mode, pbwidth_t width);
static int ft900_get_mode(RIG *rig, vfo_t vfo, rmode_t *mode, pbwidth_t *width);

static int ft900_set_vfo(RIG *rig, vfo_t vfo);
static int ft900_get_vfo(RIG *rig, vfo_t *vfo);

static int ft900_set_ptt(RIG *rig, vfo_t vfo, ptt_t ptt);
static int ft900_get_ptt(RIG *rig, vfo_t vfo, ptt_t *ptt);

static int ft900_set_split_vfo(RIG *rig, vfo_t vfo, split_t split, vfo_t tx_vfo);
static int ft900_get_split_vfo(RIG *rig, vfo_t vfo, split_t *split, vfo_t *tx_vfo);

static int ft900_set_rit(RIG *rig, vfo_t vfo, shortfreq_t rit);
static int ft900_get_rit(RIG *rig, vfo_t vfo, shortfreq_t *rit);

static int ft900_set_func(RIG *rig, vfo_t vfo, setting_t func, int status);

static int ft900_get_level(RIG *rig, vfo_t vfo, setting_t level, value_t *val);

static int ft900_vfo_op(RIG *rig, vfo_t vfo, vfo_op_t op);



/* Private helper function prototypes */

static int ft900_get_update_data(RIG *rig, unsigned char ci, unsigned char rl);

static int ft900_send_static_cmd(RIG *rig, unsigned char ci);

static int ft900_send_dynamic_cmd(RIG *rig, unsigned char ci,
                                  unsigned char p1, unsigned char p2,
                                  unsigned char p3, unsigned char p4);

static int ft900_send_dial_freq(RIG *rig, unsigned char ci, freq_t freq);

static int ft900_send_rit_freq(RIG *rig, unsigned char ci, shortfreq_t rit);


/*
 * Native ft900 cmd set prototypes. These are READ ONLY as each
 * rig instance will copy from these and modify if required.
 * Complete sequences (1) can be read and used directly as a cmd sequence.
 * Incomplete sequences (0) must be completed with extra parameters
 * eg: mem number, or freq etc..
 *
 * TODO: Shorten this static array with parameter substitution -N0NB
 *
 */

static const yaesu_cmd_set_t ncmd[] =
{
    { 1, { 0x00, 0x00, 0x00, 0x00, 0x01 } }, /* split = off */
    { 1, { 0x00, 0x00, 0x00, 0x01, 0x01 } }, /* split = on */
    { 0, { 0x00, 0x00, 0x00, 0x00, 0x02 } }, /* recall memory */
    { 0, { 0x00, 0x00, 0x00, 0x00, 0x03 } }, /* memory operations */
    { 1, { 0x00, 0x00, 0x00, 0x00, 0x05 } }, /* select vfo A */
    { 1, { 0x00, 0x00, 0x00, 0x01, 0x05 } }, /* select vfo B */
    { 0, { 0x00, 0x00, 0x00, 0x00, 0x06 } }, /* copy memory data to vfo A */
    { 0, { 0x00, 0x00, 0x00, 0x00, 0x09 } }, /* clarifier operations */
    { 0, { 0x00, 0x00, 0x00, 0x00, 0x0a } }, /* set display freq */
    { 0, { 0x00, 0x00, 0x00, 0x00, 0x0c } }, /* mode set */
    { 0, { 0x00, 0x00, 0x00, 0x00, 0x0e } }, /* update interval/pacing */
    { 1, { 0x00, 0x00, 0x00, 0x00, 0x0f } }, /* PTT off */
    { 1, { 0x00, 0x00, 0x00, 0x01, 0x0f } }, /* PTT on */
    { 1, { 0x00, 0x00, 0x00, 0x01, 0x10 } }, /* Status Update Data--Memory Channel Number (1 byte) */
    { 1, { 0x00, 0x00, 0x00, 0x02, 0x10 } }, /* Status Update Data--Current operating data for VFO/Memory (19 bytes) */
    { 1, { 0x00, 0x00, 0x00, 0x03, 0x10 } }, /* Status Update DATA--VFO A and B Data (18 bytes) */
    { 0, { 0x00, 0x00, 0x00, 0x04, 0x10 } }, /* Status Update Data--Memory Channel Data (19 bytes) P4 = 0x01-0x20 Memory Channel Number */
    { 1, { 0x00, 0x00, 0x00, 0x00, 0x81 } }, /* tuner off */
    { 1, { 0x00, 0x00, 0x00, 0x01, 0x81 } }, /* tuner on */
    { 1, { 0x00, 0x00, 0x00, 0x00, 0x82 } }, /* tuner start*/
    { 1, { 0x00, 0x00, 0x00, 0x00, 0xf7 } }, /* Read meter, S on RX, ALC|PO|SWR on TX */
    { 1, { 0x00, 0x00, 0x00, 0x00, 0xfa } }, /* Read status flags */

};


/*
 * future - private data
 *
 * FIXME: Does this need to be exposed to the application/frontend through
 * ft900_caps.priv? -N0NB
 */

struct ft900_priv_data
{
    unsigned char pacing;                     /* pacing value */
    unsigned int read_update_delay;           /* depends on pacing value */
    vfo_t current_vfo;                        /* active VFO from last cmd */
    unsigned char
    p_cmd[YAESU_CMD_LENGTH];    /* private copy of 1 constructed CAT cmd */
    unsigned char
    update_data[FT900_ALL_DATA_LENGTH]; /* returned data--max value, some are less */
    unsigned char current_mem;                /* private memory channel number */
    int ptt;                                  /* ptt status needed for meter reading */
};

/*
 * ft900 rigs capabilities.
 * Also this struct is READONLY!
 *
 */

const struct rig_caps ft900_caps =
{
    RIG_MODEL(RIG_MODEL_FT900),
    .model_name =         "FT-900",
    .mfg_name =           "Yaesu",
    .version =            "20200323.0",
    .copyright =          "LGPL",
    .status =             RIG_STATUS_STABLE,
    .rig_type =           RIG_TYPE_TRANSCEIVER,
    .ptt_type =           RIG_PTT_RIG,
    .dcd_type =           RIG_DCD_NONE,
    .port_type =          RIG_PORT_SERIAL,
    .serial_rate_min =    4800,
    .serial_rate_max =    4800,
    .serial_data_bits =   8,
    .serial_stop_bits =   2,
    .serial_parity =      RIG_PARITY_NONE,
    .serial_handshake =   RIG_HANDSHAKE_NONE,
    .write_delay =        FT900_WRITE_DELAY,
    .post_write_delay =   FT900_POST_WRITE_DELAY,
    .timeout =            2000,
    .retry =              0,
    .has_get_func =       RIG_FUNC_TUNER,
    .has_set_func =       RIG_FUNC_TUNER,
    .has_get_level =      RIG_LEVEL_STRENGTH,
    .has_set_level =      RIG_LEVEL_NONE,
    .has_get_parm =       RIG_PARM_NONE,
    .has_set_parm =       RIG_PARM_NONE,
    .ctcss_list =         NULL,
    .dcs_list =           NULL,
    .preamp =             { RIG_DBLST_END, },
    .attenuator =         { RIG_DBLST_END, },
    .max_rit =            Hz(9999),
    .max_xit =            Hz(0),
    .max_ifshift =        Hz(0),
    .vfo_ops =            RIG_OP_TUNE,
    .targetable_vfo =     RIG_TARGETABLE_ALL,
    .transceive =         RIG_TRN_OFF,        /* Yaesus have to be polled, sigh */
    .bank_qty =           0,
    .chan_desc_sz =       0,
    .chan_list =          { RIG_CHAN_END, },  /* FIXME: memory channel list: 32 */

    .rx_range_list1 =     {
        {kHz(100), MHz(30), FT900_ALL_RX_MODES, -1, -1, FT900_VFO_ALL, FT900_ANTS},   /* General coverage + ham */
        RIG_FRNG_END,
    }, /* FIXME:  Are these the correct Region 1 values? */

    .tx_range_list1 =     {
        FRQ_RNG_HF(1, FT900_OTHER_TX_MODES, W(5), W(100), FT900_VFO_ALL, FT900_ANTS),
        FRQ_RNG_HF(1, FT900_AM_TX_MODES, W(2), W(25), FT900_VFO_ALL, FT900_ANTS),   /* AM class */

        RIG_FRNG_END,
    },

    .rx_range_list2 =     {
        {kHz(100), MHz(30), FT900_ALL_RX_MODES, -1, -1, FT900_VFO_ALL, FT900_ANTS},
        RIG_FRNG_END,
    },

    .tx_range_list2 =     {
        FRQ_RNG_HF(2, FT900_OTHER_TX_MODES, W(5), W(100), FT900_VFO_ALL, FT900_ANTS),
        FRQ_RNG_HF(2, FT900_AM_TX_MODES, W(2), W(25), FT900_VFO_ALL, FT900_ANTS),   /* AM class */

        RIG_FRNG_END,
    },

    .tuning_steps =       {
        {FT900_SSB_CW_RX_MODES, Hz(10)},    /* Normal */
        {FT900_SSB_CW_RX_MODES, Hz(100)},   /* Fast */

        {FT900_AM_RX_MODES,     Hz(100)},   /* Normal */
        {FT900_AM_RX_MODES,     kHz(1)},    /* Fast */

        {FT900_FM_RX_MODES,     Hz(100)},   /* Normal */
        {FT900_FM_RX_MODES,     kHz(1)},    /* Fast */

        RIG_TS_END,

    },

    /* mode/filter list, .remember =  order matters! */
    .filters =            {
        {RIG_MODE_SSB,  kHz(2.2)},  /* standard SSB filter bandwidth */
        {RIG_MODE_CW,   kHz(2.2)},  /* normal CW filter */
        {RIG_MODE_CW,   kHz(0.5)},  /* CW filter with narrow selection (must be installed!) */
        {RIG_MODE_AM,   kHz(6)},    /* normal AM filter */
        {RIG_MODE_AM,   kHz(2.2)},  /* AM filter with narrow selection (SSB filter switched in) */
        {RIG_MODE_FM,   kHz(12)},   /* FM  */

        RIG_FLT_END,
    },

    .priv =               NULL,           /* private data FIXME: */

    .rig_init =           ft900_init,
    .rig_cleanup =        ft900_cleanup,
    .rig_open =           ft900_open,     /* port opened */
    .rig_close =          ft900_close,    /* port closed */

    .set_freq =           ft900_set_freq,
    .get_freq =           ft900_get_freq,
    .set_mode =           ft900_set_mode,
    .get_mode =           ft900_get_mode,
    .set_vfo =            ft900_set_vfo,
    .get_vfo =            ft900_get_vfo,
    .set_ptt =            ft900_set_ptt,
    .get_ptt =            ft900_get_ptt,
    .set_split_vfo =          ft900_set_split_vfo,
    .get_split_vfo =          ft900_get_split_vfo,
    .set_rit =            ft900_set_rit,
    .get_rit =            ft900_get_rit,
    .set_func =           ft900_set_func,
    .get_level =          ft900_get_level,
    .vfo_op =             ft900_vfo_op,
};


/*
 * ************************************
 *
 * Hamlib API functions
 *
 * ************************************
 */

/*
 * rig_init
 *
 */

static int ft900_init(RIG *rig)
{
    struct ft900_priv_data *priv;

    rig_debug(RIG_DEBUG_VERBOSE, "%s called\n", __func__);

    if (!rig)
    {
        return -RIG_EINVAL;
    }

    rig->state.priv = (struct ft900_priv_data *) calloc(1,
                      sizeof(struct ft900_priv_data));

    if (!rig->state.priv)                       /* whoops! memory shortage! */
    {
        return -RIG_ENOMEM;
    }

    priv = rig->state.priv;

    /* TODO: read pacing from preferences */
    priv->pacing = FT900_PACING_DEFAULT_VALUE; /* set pacing to minimum for now */
    priv->read_update_delay =
        FT900_DEFAULT_READ_TIMEOUT; /* set update timeout to safe value */
    priv->current_vfo =  RIG_VFO_MAIN;  /* default to whatever */

    return RIG_OK;
}


/*
 * rig_cleanup
 *
 * the serial port is closed by the frontend
 *
 */

static int ft900_cleanup(RIG *rig)
{

    rig_debug(RIG_DEBUG_VERBOSE, "%s called\n", __func__);

    if (!rig)
    {
        return -RIG_EINVAL;
    }

    if (rig->state.priv)
    {
        free(rig->state.priv);
    }

    rig->state.priv = NULL;

    return RIG_OK;
}


/*
 * rig_open
 *
 */

static int ft900_open(RIG *rig)
{
    struct rig_state *rig_s;
    struct ft900_priv_data *priv;
    int err;

    rig_debug(RIG_DEBUG_VERBOSE, "%s called\n", __func__);

    if (!rig)
    {
        return -RIG_EINVAL;
    }

    priv = (struct ft900_priv_data *)rig->state.priv;
    rig_s = &rig->state;

    rig_debug(RIG_DEBUG_TRACE, "%s: write_delay = %i msec\n",
              __func__, rig_s->rigport.write_delay);
    rig_debug(RIG_DEBUG_TRACE, "%s: post_write_delay = %i msec\n",
              __func__, rig_s->rigport.post_write_delay);
    rig_debug(RIG_DEBUG_TRACE,
              "%s: read pacing = %i\n", __func__, priv->pacing);

    err = ft900_send_dynamic_cmd(rig, FT900_NATIVE_PACING,
                                 priv->pacing, 0, 0, 0);

    if (err != RIG_OK)
    {
        return err;
    }

    return RIG_OK;
}


/*
 * rig_close
 *
 */

static int ft900_close(RIG *rig)
{

    rig_debug(RIG_DEBUG_VERBOSE, "%s called\n", __func__);

    if (!rig)
    {
        return -RIG_EINVAL;
    }

    return RIG_OK;
}


/*
 * rig_set_freq
 *
 * Set frequency for a given VFO
 *
 * If vfo is set to RIG_VFO_CUR then vfo from priv_data is used.
 * If vfo differs from stored value then VFO will be set to the
 * passed vfo.
 *
 */

static int ft900_set_freq(RIG *rig, vfo_t vfo, freq_t freq)
{
    struct ft900_priv_data *priv;
    int err;

    rig_debug(RIG_DEBUG_VERBOSE, "%s called\n", __func__);

    if (!rig)
    {
        return -RIG_EINVAL;
    }

    priv = (struct ft900_priv_data *)rig->state.priv;

    rig_debug(RIG_DEBUG_TRACE, "%s: passed vfo = 0x%02x\n", __func__, vfo);
    rig_debug(RIG_DEBUG_TRACE, "%s: passed freq = %"PRIfreq" Hz\n", __func__, freq);

    if (vfo == RIG_VFO_CURR)
    {
        vfo = priv->current_vfo;    /* from previous vfo cmd */
        rig_debug(RIG_DEBUG_TRACE, "%s: priv->current_vfo = 0x%02x\n",
                  __func__, vfo);
    }
    else if (vfo != priv->current_vfo)
    {
        /* force a VFO change if requested vfo value differs from stored value */
        err = ft900_set_vfo(rig, vfo);

        if (err != RIG_OK)
        {
            return err;
        }
    }

    err = ft900_send_dial_freq(rig, FT900_NATIVE_FREQ_SET, freq);

    if (err != RIG_OK)
    {
        return err;
    }

    return RIG_OK;
}


/*
 * rig_get_freq
 *
 * Return Freq for a given VFO
 *
 */

static int ft900_get_freq(RIG *rig, vfo_t vfo, freq_t *freq)
{
    struct ft900_priv_data *priv;
    unsigned char *p;
    unsigned char offset;
    freq_t f;
    int err, cmd_index, count;

    rig_debug(RIG_DEBUG_VERBOSE, "%s called\n", __func__);
    rig_debug(RIG_DEBUG_TRACE, "%s: passed vfo = 0x%02x\n", __func__, vfo);

    if (!rig)
    {
        return -RIG_EINVAL;
    }

    priv = (struct ft900_priv_data *)rig->state.priv;

    if (vfo == RIG_VFO_CURR)
    {
        err = ft900_get_vfo(rig, &priv->current_vfo);

        if (err != RIG_OK)
        {
            return err;
        }

        vfo = priv->current_vfo;    /* from previous vfo cmd */
        rig_debug(RIG_DEBUG_TRACE,
                  "%s: priv->current_vfo = 0x%02x\n", __func__, vfo);
    }

    switch (vfo)
    {
    case RIG_VFO_A:
    case RIG_VFO_VFO:
        cmd_index = FT900_NATIVE_VFO_DATA;
        offset = FT900_SUMO_VFO_A_FREQ;
        count = FT900_VFO_DATA_LENGTH;
        break;

    case RIG_VFO_B:
        cmd_index = FT900_NATIVE_VFO_DATA;
        offset = FT900_SUMO_VFO_B_FREQ;
        count = FT900_VFO_DATA_LENGTH;
        break;

    case RIG_VFO_MEM:
    case RIG_VFO_MAIN:
        cmd_index = FT900_NATIVE_OP_DATA;
        offset = FT900_SUMO_DISPLAYED_FREQ;
        count = FT900_OP_DATA_LENGTH;
        break;

    default:
        return -RIG_EINVAL;         /* sorry, wrong VFO */
    }

    err = ft900_get_update_data(rig, cmd_index, count);

    if (err != RIG_OK)
    {
        return err;
    }

    p = &priv->update_data[offset];

    /* big endian integer */
    f = ((((p[0] << 8) + p[1]) << 8) + p[2]) * 10;

    rig_debug(RIG_DEBUG_TRACE,
              "%s: freq = %"PRIfreq" Hz for vfo 0x%02x\n", __func__, f, vfo);

    *freq = f;                    /* return displayed frequency */

    return RIG_OK;
}


/*
 * rig_set_mode
 *
 * set mode and passband: eg AM, CW etc for a given VFO
 *
 * If vfo is set to RIG_VFO_CUR then vfo from priv_data is used.
 *
 */

static int ft900_set_mode(RIG *rig, vfo_t vfo, rmode_t mode,
                          pbwidth_t width)
{
    struct ft900_priv_data *priv;
    unsigned char mode_parm;      /* mode parameter */
    int err;

    rig_debug(RIG_DEBUG_VERBOSE, "%s called\n", __func__);

    if (!rig)
    {
        return -RIG_EINVAL;
    }

    rig_debug(RIG_DEBUG_TRACE, "%s: passed vfo = %s\n", __func__, rig_strvfo(vfo));
    rig_debug(RIG_DEBUG_TRACE, "%s: passed mode = %s\n", __func__,
              rig_strrmode(mode));
    rig_debug(RIG_DEBUG_TRACE, "%s: passed width = %li Hz\n",
              __func__, width);

    priv = (struct ft900_priv_data *)rig->state.priv;

    if (vfo == RIG_VFO_CURR)
    {
        vfo = priv->current_vfo;    /* from previous vfo cmd */
        rig_debug(RIG_DEBUG_TRACE,
                  "%s: priv->current_vfo  = 0x%02x\n", __func__, vfo);
    }

    /* translate mode from generic to ft900 specific */
    switch (vfo)
    {
    case RIG_VFO_A:               /* force to VFO */
    case RIG_VFO_VFO:
        err = ft900_set_vfo(rig, RIG_VFO_A);

        if (err != RIG_OK)
        {
            return err;
        }

        break;

    case RIG_VFO_B:
        err = ft900_set_vfo(rig, RIG_VFO_B);

        if (err != RIG_OK)
        {
            return err;
        }

        break;

    case RIG_VFO_MEM:             /* MEM TUNE or user doesn't care */
    case RIG_VFO_MAIN:
        break;

    default:
        return -RIG_EINVAL;       /* sorry, wrong VFO */
    }

    switch (mode)
    {
    case RIG_MODE_AM:
        mode_parm = MODE_SET_AM_W;
        break;

    case RIG_MODE_CW:
        mode_parm = MODE_SET_CW_W;
        break;

    case RIG_MODE_USB:
        mode_parm = MODE_SET_USB;
        break;

    case RIG_MODE_LSB:
        mode_parm = MODE_SET_LSB;
        break;

    case RIG_MODE_FM:
        mode_parm = MODE_SET_FM;
        break;

    default:
        return -RIG_EINVAL;       /* sorry, wrong MODE */
    }

    /*
     * Now set width (shamelessly stolen from ft847.c and then butchered :)
     * The FT-900 only supports narrow width in AM and CW modes
     *
     */
    if (width != RIG_PASSBAND_NOCHANGE)
    {
        if (width == rig_passband_narrow(rig, mode))
        {
            switch (mode)
            {
            case RIG_MODE_CW:
                mode_parm = MODE_SET_CW_N;
                break;

            case RIG_MODE_AM:
                mode_parm = MODE_SET_AM_N;
                break;

            default:
                return -RIG_EINVAL; /* Invalid mode, how can caller know? */
            }
        }
        else
        {
            if (width != RIG_PASSBAND_NORMAL &&
                    width != rig_passband_normal(rig, mode))
            {
                return -RIG_EINVAL; /* Invalid width, how can caller know? */
            }
        }
    }

    rig_debug(RIG_DEBUG_TRACE, "%s: set mode_parm = 0x%02x\n", __func__, mode_parm);

    err = ft900_send_dynamic_cmd(rig, FT900_NATIVE_MODE_SET,
                                 mode_parm, 0, 0, 0);

    if (err != RIG_OK)
    {
        return err;
    }

    return RIG_OK;                /* good */
}


/*
 * rig_get_mode
 *
 * get mode eg AM, CW etc for a given VFO
 *
 */

static int ft900_get_mode(RIG *rig, vfo_t vfo, rmode_t *mode, pbwidth_t *width)
{
    struct ft900_priv_data *priv;
    unsigned char my_mode, m_offset;    /* ft900 mode, mode offset */
    unsigned char flag, f_offset;       /* CW/AM narrow flag */
    int err, cmd_index, norm, count;

    rig_debug(RIG_DEBUG_VERBOSE, "%s called\n", __func__);

    if (!rig)
    {
        return -RIG_EINVAL;
    }

    rig_debug(RIG_DEBUG_TRACE, "%s: passed vfo = 0x%02x\n", __func__, vfo);

    priv = (struct ft900_priv_data *)rig->state.priv;

    if (vfo == RIG_VFO_CURR)
    {
        vfo = priv->current_vfo;    /* from previous vfo cmd */
        rig_debug(RIG_DEBUG_TRACE,
                  "%s: priv->current_vfo = 0x%02x\n", __func__, vfo);
    }

    switch (vfo)
    {
    case RIG_VFO_A:
    case RIG_VFO_VFO:
        cmd_index = FT900_NATIVE_VFO_DATA;
        m_offset = FT900_SUMO_VFO_A_MODE;
        f_offset = FT900_SUMO_VFO_A_FLAG;
        count = FT900_VFO_DATA_LENGTH;
        break;

    case RIG_VFO_B:
        cmd_index = FT900_NATIVE_VFO_DATA;
        m_offset = FT900_SUMO_VFO_B_MODE;
        f_offset = FT900_SUMO_VFO_B_FLAG;
        count = FT900_VFO_DATA_LENGTH;
        break;

    case RIG_VFO_MEM:
    case RIG_VFO_MAIN:
        cmd_index = FT900_NATIVE_OP_DATA;
        m_offset = FT900_SUMO_DISPLAYED_MODE;
        f_offset = FT900_SUMO_DISPLAYED_FLAG;
        count = FT900_OP_DATA_LENGTH;
        break;

    default:
        return -RIG_EINVAL;
    }

    err = ft900_get_update_data(rig, cmd_index, count);

    if (err != RIG_OK)
    {
        return err;
    }

    my_mode = MODE_MASK & priv->update_data[m_offset];
    flag = FLAG_MASK & priv->update_data[f_offset];


    rig_debug(RIG_DEBUG_TRACE, "%s: mode = %s\n", __func__, rig_strrmode(*mode));
    rig_debug(RIG_DEBUG_TRACE, "%s: flag = 0x%02x\n", __func__, flag);

    /*
     * translate mode from ft900 to generic.
     */
    switch (my_mode)
    {
    case MODE_LSB:
        *mode = RIG_MODE_LSB;
        norm = TRUE;
        break;

    case MODE_USB:
        *mode = RIG_MODE_USB;
        norm = TRUE;
        break;

    case MODE_CW:
        *mode = RIG_MODE_CW;

        if (flag & FLAG_CW_N)
        {
            norm = FALSE;
        }
        else
        {
            norm = TRUE;
        }

        break;

    case MODE_AM:
        *mode = RIG_MODE_AM;

        if (flag & FLAG_AM_N)
        {
            norm = FALSE;
        }
        else
        {
            norm = TRUE;
        }

        break;

    case MODE_FM:
        *mode = RIG_MODE_FM;
        norm = TRUE;
        break;

    default:
        return -RIG_EINVAL;         /* Oops! file bug report */
    }

    if (norm)
    {
        *width = rig_passband_normal(rig, *mode);
    }
    else
    {
        *width = rig_passband_narrow(rig, *mode);
    }

    rig_debug(RIG_DEBUG_TRACE, "%s: set mode = %s\n", __func__,
              rig_strrmode(*mode));
    rig_debug(RIG_DEBUG_TRACE, "%s: set width = %d Hz\n", __func__, (int)*width);

    return RIG_OK;
}


/*
 * rig_set_vfo
 *
 * set vfo and store requested vfo for later RIG_VFO_CURR
 * requests.
 *
 */

static int ft900_set_vfo(RIG *rig, vfo_t vfo)
{
    struct ft900_priv_data *priv;
    unsigned char cmd_index;      /* index of sequence to send */
    int err;

    rig_debug(RIG_DEBUG_VERBOSE, "%s called\n", __func__);

    if (!rig)
    {
        return -RIG_EINVAL;
    }

    rig_debug(RIG_DEBUG_TRACE, "%s: passed vfo = 0x%02x\n", __func__, vfo);

    priv = (struct ft900_priv_data *)rig->state.priv;

    if (vfo == RIG_VFO_CURR)
    {
        vfo = priv->current_vfo;    /* from previous vfo cmd */
        rig_debug(RIG_DEBUG_TRACE,
                  "%s: priv->current_vfo = 0x%02x\n", __func__, vfo);
    }

    /* FIXME: Include support for RIG_VFO_MAIN */
    switch (vfo)
    {
    case RIG_VFO_A:
        cmd_index = FT900_NATIVE_VFO_A;
        priv->current_vfo = vfo;    /* update active VFO */
        break;

    case RIG_VFO_B:
        cmd_index = FT900_NATIVE_VFO_B;
        priv->current_vfo = vfo;
        break;

    case RIG_VFO_MEM:
        /* reset to memory channel stored by previous get_vfo
         * The recall mem channel command uses 0x01 though 0x20
         */
        err = ft900_send_dynamic_cmd(rig, FT900_NATIVE_RECALL_MEM,
                                     (priv->current_mem + 1), 0, 0, 0);

        if (err != RIG_OK)
        {
            return err;
        }

        priv->current_vfo = vfo;

        rig_debug(RIG_DEBUG_TRACE, "%s: set mem channel = 0x%02x\n",
                  __func__, priv->current_mem);
        return RIG_OK;

    default:
        return -RIG_EINVAL;         /* sorry, wrong VFO */
    }

    rig_debug(RIG_DEBUG_TRACE, "%s: set cmd_index = %i\n", __func__, cmd_index);

    err = ft900_send_static_cmd(rig, cmd_index);

    if (err != RIG_OK)
    {
        return err;
    }

    return RIG_OK;
}


/*
 * rig_get_vfo
 *
 * get current RX vfo/mem and store requested vfo for
 * later RIG_VFO_CURR requests plus pass the tested vfo/mem
 * back to the frontend.
 *
 */

static int ft900_get_vfo(RIG *rig, vfo_t *vfo)
{
    struct ft900_priv_data *priv;
    unsigned char status_0;           /* ft900 status flag 0 */
    unsigned char stat_vfo, stat_mem; /* status tests */
    int err;

    rig_debug(RIG_DEBUG_VERBOSE, "%s called\n", __func__);

    if (!rig)
    {
        return -RIG_EINVAL;
    }

    priv = (struct ft900_priv_data *)rig->state.priv;

    /* Get flags for VFO status */
    err = ft900_get_update_data(rig, FT900_NATIVE_READ_FLAGS,
                                FT900_STATUS_FLAGS_LENGTH);

    if (err != RIG_OK)
    {
        return err;
    }

    status_0 = priv->update_data[FT900_SUMO_DISPLAYED_STATUS_0];
    stat_vfo = status_0 & SF_VFO_MASK;    /* get VFO active bits */
    stat_mem = status_0 & SF_MEM_MASK;    /* get MEM active bits */

    rig_debug(RIG_DEBUG_TRACE,
              "%s: vfo status_0 = 0x%02x\n", __func__, status_0);
    rig_debug(RIG_DEBUG_TRACE,
              "%s: stat_vfo = 0x%02x\n", __func__, stat_vfo);
    rig_debug(RIG_DEBUG_TRACE,
              "%s: stat_mem = 0x%02x\n", __func__, stat_mem);

    /*
     * translate vfo and mem status from ft900 to generic.
     *
     * First a test is made on bits 6 and 7 of status_0.  Bit 7 is set
     * when FT-900 is in VFO mode on display.  Bit 6 is set when VFO B
     * is active and cleared when VFO A is active.
     *
     * Conversely, bit 7 is cleared when MEM or MEM TUNE mode is selected
     * Bit 6 still follows last selected VFO (A or B), but this is not
     * tested right now.
     */
    switch (stat_vfo)
    {
    case SF_VFOA:
        *vfo = RIG_VFO_A;
        priv->current_vfo = RIG_VFO_A;
        break;

    case SF_VFOB:
        *vfo = RIG_VFO_B;
        priv->current_vfo = RIG_VFO_B;
        break;

    default:
        switch (stat_mem)
        {
        case SF_MT:
        case SF_MR:
            *vfo = RIG_VFO_MEM;
            priv->current_vfo = RIG_VFO_MEM;

            /*
             * Per Hamlib policy capture and store memory channel number
             * for future set_vfo command.
             */
            err = ft900_get_update_data(rig, FT900_NATIVE_MEM_CHNL,
                                        FT900_MEM_CHNL_LENGTH);

            if (err != RIG_OK)
            {
                return err;
            }

            priv->current_mem = priv->update_data[FT900_SUMO_MEM_CHANNEL];

            rig_debug(RIG_DEBUG_TRACE, "%s: stored mem channel = 0x%02x\n",
                      __func__, priv->current_mem);
            break;

        default:                      /* Oops! */
            return -RIG_EINVAL;         /* sorry, wrong current VFO */
        }
    }

    rig_debug(RIG_DEBUG_TRACE, "%s: set vfo = 0x%02x\n", __func__, *vfo);

    return RIG_OK;

}


/*
 * rig_set_ptt
 *
 * set the '900 into TX mode
 *
 * vfo is respected by calling ft900_set_vfo if
 * passed vfo != priv->current_vfo
 *
 */

static int ft900_set_ptt(RIG *rig, vfo_t vfo, ptt_t ptt)
{
    struct ft900_priv_data *priv;
    unsigned char cmd_index;
    int err;

    rig_debug(RIG_DEBUG_VERBOSE, "%s called\n", __func__);

    if (!rig)
    {
        return -RIG_EINVAL;
    }

    priv = (struct ft900_priv_data *)rig->state.priv;

    rig_debug(RIG_DEBUG_TRACE, "%s: passed vfo = 0x%02x\n", __func__, vfo);
    rig_debug(RIG_DEBUG_TRACE, "%s: passed ptt = 0x%02x\n", __func__, ptt);

    if (vfo == RIG_VFO_CURR)
    {
        vfo = priv->current_vfo;    /* from previous vfo cmd */
        rig_debug(RIG_DEBUG_TRACE,
                  "%s: priv->current_vfo = 0x%02x\n", __func__, vfo);
    }
    else if (vfo != priv->current_vfo)
    {
        ft900_set_vfo(rig, vfo);
    }

    switch (ptt)
    {
    case RIG_PTT_OFF:
        cmd_index = FT900_NATIVE_PTT_OFF;
        priv->ptt = 0;
        break;

    case RIG_PTT_ON:
        cmd_index = FT900_NATIVE_PTT_ON;
        priv->ptt = 1;
        break;

    default:
        return -RIG_EINVAL;         /* wrong PTT state! */
    }

    err = ft900_send_static_cmd(rig, cmd_index);

    if (err != RIG_OK)
    {
        return err;
    }

    return RIG_OK;
}


/*
 * rig_get_ptt
 *
 * get current PTT status
 *
 */

static int ft900_get_ptt(RIG *rig, vfo_t vfo, ptt_t *ptt)
{
    struct ft900_priv_data *priv;
    unsigned char status_2;           /* ft900 status flag 2 */
    unsigned char stat_ptt;           /* status tests */
    int err;

    rig_debug(RIG_DEBUG_VERBOSE, "%s called\n", __func__);

    if (!rig)
    {
        return -RIG_EINVAL;
    }

    priv = (struct ft900_priv_data *)rig->state.priv;

    /* Get flags for VFO status */
    err = ft900_get_update_data(rig, FT900_NATIVE_READ_FLAGS,
                                FT900_STATUS_FLAGS_LENGTH);

    if (err != RIG_OK)
    {
        return err;
    }

    status_2 = priv->update_data[FT900_SUMO_DISPLAYED_STATUS_2];
    stat_ptt = status_2 & SF_PTT_MASK;    /* get PTT active bit */

    rig_debug(RIG_DEBUG_TRACE,
              "%s: ptt status_2 = 0x%02x\n", __func__, status_2);

    switch (stat_ptt)
    {
    case SF_PTT_OFF:
        *ptt = RIG_PTT_OFF;
        break;

    case SF_PTT_ON:
        *ptt = RIG_PTT_ON;
        break;

    default:                      /* Oops! */
        return -RIG_EINVAL;         /* Invalid PTT bit?! */
    }

    priv->ptt = *ptt;

    return RIG_OK;
}


/*
 * rig_set_split_vfo
 *
 * set the '900 into split TX/RX mode
 *
 * VFO cannot be set as the set split on command only changes the
 * TX to the other VFO.  Setting split off returns the TX to the
 * main display.
 *
 */

static int ft900_set_split_vfo(RIG *rig, vfo_t vfo, split_t split,
                               vfo_t tx_vfo)
{
    unsigned char cmd_index;
    int err;

    rig_debug(RIG_DEBUG_VERBOSE, "%s called\n", __func__);

    if (!rig)
    {
        return -RIG_EINVAL;
    }

    rig_debug(RIG_DEBUG_TRACE, "%s: passed vfo = 0x%02x\n", __func__, vfo);
    rig_debug(RIG_DEBUG_TRACE, "%s: passed split = 0x%02x\n", __func__, split);

    switch (split)
    {
    case RIG_SPLIT_OFF:
        cmd_index = FT900_NATIVE_SPLIT_OFF;
        break;

    case RIG_SPLIT_ON:
        cmd_index = FT900_NATIVE_SPLIT_ON;
        break;

    default:
        return -RIG_EINVAL;
    }

    err = ft900_send_static_cmd(rig, cmd_index);

    if (err != RIG_OK)
    {
        return err;
    }

    return RIG_OK;
}


/*
 * rig_get_split_vfo
 *
 * Get whether the '900 is in split mode
 *
 * vfo value is not used
 *
 */

static int ft900_get_split_vfo(RIG *rig, vfo_t vfo, split_t *split,
                               vfo_t *tx_vfo)
{
    struct ft900_priv_data *priv;
    unsigned char status_0;
    int err;

    rig_debug(RIG_DEBUG_VERBOSE, "%s called\n", __func__);

    if (!rig)
    {
        return -RIG_EINVAL;
    }

    rig_debug(RIG_DEBUG_TRACE, "%s: passed vfo = 0x%02x\n", __func__, vfo);

    priv = (struct ft900_priv_data *)rig->state.priv;

    /* Get flags for VFO split status */
    err = ft900_get_update_data(rig, FT900_NATIVE_READ_FLAGS,
                                FT900_STATUS_FLAGS_LENGTH);

    if (err != RIG_OK)
    {
        return err;
    }

    /* get Split active bit */
    status_0 = SF_SPLIT & priv->update_data[FT900_SUMO_DISPLAYED_STATUS_0];

    rig_debug(RIG_DEBUG_TRACE,
              "%s: split status_0 = 0x%02x\n", __func__, status_0);

    switch (status_0)
    {
    case SF_SPLIT:
        *split = RIG_SPLIT_ON;
        break;

    default:
        *split = RIG_SPLIT_OFF;
        break;
    }

    return RIG_OK;
}

/*
 * rig_set_rit
 *
 * VFO and MEM rit values are independent.
 *
 * passed vfo value is respected.
 *
 * Clarifier offset is retained in the rig for either VFO when the
 * VFO is changed.  Offset is not retained when in memory tune mode
 * and VFO mode is selected or another memory channel is selected.
 *
 */

static int ft900_set_rit(RIG *rig, vfo_t vfo, shortfreq_t rit)
{
    struct ft900_priv_data *priv;
//  unsigned char offset;
    int err;

    rig_debug(RIG_DEBUG_VERBOSE, "%s called\n", __func__);

    if (!rig)
    {
        return -RIG_EINVAL;
    }

    if (rit < -9990 || rit > 9990)
    {
        return -RIG_EINVAL;
    }

    rig_debug(RIG_DEBUG_TRACE, "%s: passed vfo = 0x%02x\n", __func__, vfo);
    rig_debug(RIG_DEBUG_TRACE, "%s: passed rit = %li\n", __func__, rit);

    priv = (struct ft900_priv_data *)rig->state.priv;

    /*
     * The assumption here is that the user hasn't changed
     * the VFO manually.  Does it really need to be checked
     * every time?  My goal is to reduce the traffic on the
     * serial line to a minimum, but respect the application's
     * request to change the VFO with this call.
     *
     */
    if (vfo == RIG_VFO_CURR)
    {
        vfo = priv->current_vfo;    /* from previous rig_get_vfo cmd */
        rig_debug(RIG_DEBUG_TRACE,
                  "%s: priv->current_vfo = 0x%02x\n", __func__, vfo);
    }
    else if (vfo != priv->current_vfo)
    {
        ft900_set_vfo(rig, vfo);
    }

    /*
     * Shuts clarifier off but does not set frequency to 0 Hz
     */
    if (rit == 0)
    {
        err = ft900_send_dynamic_cmd(rig, FT900_NATIVE_CLARIFIER_OPS,
                                     CLAR_RX_OFF, 0, 0, 0);

        if (err != RIG_OK)
        {
            rig_debug(RIG_DEBUG_ERR, "%s: clarifier off error: %s\n", __func__,
                      rigerror(err));
        }

        return err;
    }

    /*
     * Clarifier must first be turned on then the frequency can
     * be set, +9990 Hz to -9990 Hz
     */
    err = ft900_send_dynamic_cmd(rig, FT900_NATIVE_CLARIFIER_OPS,
                                 CLAR_RX_ON, 0, 0, 0);

    if (err != RIG_OK)
    {
        return err;
    }

    err = ft900_send_rit_freq(rig, FT900_NATIVE_CLARIFIER_OPS, rit);

    if (err != RIG_OK)
    {
        return err;
    }

    return RIG_OK;
}


/*
 * rig_get_rit
 *
 * Rig returns offset as hex from 0x0000 to 0x03e7 for 0 to +9.990 kHz
 * and 0xffff to 0xfc19 for -1 to -9.990 kHz
 *
 */

static int ft900_get_rit(RIG *rig, vfo_t vfo, shortfreq_t *rit)
{
    struct ft900_priv_data *priv;
    unsigned char *p;
    unsigned char offset;
    shortfreq_t f;
    int err, cmd_index, length;

    rig_debug(RIG_DEBUG_VERBOSE, "%s called\n", __func__);

    if (!rig)
    {
        return -RIG_EINVAL;
    }

    rig_debug(RIG_DEBUG_TRACE, "%s: passed vfo = 0x%02x\n", __func__, vfo);

    priv = (struct ft900_priv_data *)rig->state.priv;

    if (vfo == RIG_VFO_CURR)
    {
        vfo = priv->current_vfo;    /* from previous vfo cmd */
        rig_debug(RIG_DEBUG_TRACE,
                  "%s: priv->current_vfo = 0x%02x\n", __func__, vfo);
    }

    switch (vfo)
    {
    case RIG_VFO_MEM:
        cmd_index = FT900_NATIVE_OP_DATA;
        offset = FT900_SUMO_DISPLAYED_CLAR;
        length = FT900_OP_DATA_LENGTH;
        break;

    case RIG_VFO_A:
    case RIG_VFO_VFO:
        cmd_index = FT900_NATIVE_VFO_DATA;
        offset = FT900_SUMO_VFO_A_CLAR;
        length = FT900_VFO_DATA_LENGTH;
        break;

    case RIG_VFO_B:
        cmd_index = FT900_NATIVE_VFO_DATA;
        offset = FT900_SUMO_VFO_B_CLAR;
        length = FT900_VFO_DATA_LENGTH;
        break;

    default:
        return -RIG_EINVAL;
    }

    rig_debug(RIG_DEBUG_TRACE, "%s: set cmd_index = %i\n", __func__, cmd_index);
    rig_debug(RIG_DEBUG_TRACE, "%s: set offset = 0x%02x\n", __func__, offset);

    err = ft900_get_update_data(rig, cmd_index, length);

    if (err != RIG_OK)
    {
        return err;
    }

    p = &priv->update_data[offset];

    /* big endian integer */
    f = (p[0] << 8) + p[1];       /* returned value is hex to nearest hundred Hz */

    if (f > 0xfc18)               /* 0xfc19 to 0xffff is negative offset */
    {
        f = ~(0xffff - f);
    }

    rig_debug(RIG_DEBUG_TRACE, "%s: read freq = %li Hz\n", __func__, f * 10);

    *rit = f * 10;                /* store clarifier frequency */

    return RIG_OK;
}


/*
 * rig_set_func
 *
 * set the '900 supported functions
 *
 * vfo is ignored for tuner as it is an independent function
 *
 */

static int ft900_set_func(RIG *rig, vfo_t vfo, setting_t func, int status)
{
    int err, cmd_index;

    rig_debug(RIG_DEBUG_VERBOSE, "%s called\n", __func__);

    if (!rig)
    {
        return -RIG_EINVAL;
    }

    rig_debug(RIG_DEBUG_TRACE, "%s: passed func = %s\n", __func__,
              rig_strfunc(func));
    rig_debug(RIG_DEBUG_TRACE, "%s: passed status = %i\n", __func__, status);

    switch (func)
    {
    case RIG_FUNC_TUNER:
        switch (status)
        {
        case OFF:
            cmd_index = FT900_NATIVE_TUNER_OFF;
            break;

        case ON:
            cmd_index = FT900_NATIVE_TUNER_ON;
            break;

        default:
            return -RIG_EINVAL;
        }

        break;

    default:
        return -RIG_EINVAL;
    }

    err = ft900_send_static_cmd(rig, cmd_index);

    if (err != RIG_OK)
    {
        return err;
    }

    return RIG_OK;
}


/*
 * rig_get_level
 *
 * get the '900 meter level
 *
 * vfo is ignored for now
 *
 * Meter level returned from FT-900 is S meter when rig is in RX
 * Meter level returned is one of ALC or PO or SWR when rig is in TX
 * depending on front panel meter selection.  Meter selection is NOT
 * available via CAT.
 *
 * TODO: Add support for TX values
 *
 */

static int ft900_get_level(RIG *rig, vfo_t vfo, setting_t level, value_t *val)
{
    struct ft900_priv_data *priv;
    unsigned char *p;
    int err;
    cal_table_t cal = FT900_STR_CAL_SMETER;

    rig_debug(RIG_DEBUG_VERBOSE, "%s called\n", __func__);

    if (!rig)
    {
        return -RIG_EINVAL;
    }

    rig_debug(RIG_DEBUG_TRACE, "%s: passed level = %s\n", __func__,
              rig_strlevel(level));

    priv = (struct ft900_priv_data *)rig->state.priv;

    switch (level)
    {

    case RIG_LEVEL_STRENGTH:
        err = ft900_get_update_data(rig, FT900_NATIVE_READ_METER,
                                    FT900_STATUS_FLAGS_LENGTH);

        if (err != RIG_OK)
        {
            return err;
        }

        p = &priv->update_data[FT900_SUMO_METER];

        /*
         * My FT-900 returns a range of 0x00 to 0x44 for S0 to S9 and 0x44 to
         * 0x9d for S9 to S9 +60
         *
         * For ease of calculation I rounded S9 up to 0x48 (72 decimal) and
         * S9 +60 up to 0xa0 (160 decimal).  I calculated a divisor for readings
         * less than S9 by dividing 72 by 54 and the divisor for readings greater
         * than S9 by dividing 88 (160 - 72) by 60.  The result tracks rather well.
         *
         * The greatest error is around S1 and S2 and then from S9 to S9 +35.  Such
         * is life when mapping non-linear S-meters to a linear scale.
         *
         */
        if (priv->ptt)
        {
            cal = (cal_table_t)FT900_STR_CAL_POWER;
        }

        val->i = (int)rig_raw2val(*p, &cal);

        rig_debug(RIG_DEBUG_TRACE, "%s: calculated level = %i\n", __func__, val->i);

        break;

    default:
        return -RIG_EINVAL;
    }

    return RIG_OK;
}


/*
 * rig_vfo_op
 *
 * VFO operations--tuner start, etc
 *
 * vfo is ignored for now
 *
 */

static int ft900_vfo_op(RIG *rig, vfo_t vfo, vfo_op_t op)
{
    int err, cmd_index;

    rig_debug(RIG_DEBUG_VERBOSE, "%s called\n", __func__);

    if (!rig)
    {
        return -RIG_EINVAL;
    }

    rig_debug(RIG_DEBUG_TRACE, "%s: passed op = 0x%02x\n", __func__, op);

    switch (op)
    {
    case RIG_OP_TUNE:
        cmd_index = FT900_NATIVE_TUNER_START;
        break;

    default:
        return -RIG_EINVAL;
    }

    err = ft900_send_static_cmd(rig, cmd_index);

    if (err != RIG_OK)
    {
        return err;
    }

    return RIG_OK;
}


/*
 * ************************************
 *
 * Private functions to ft900 backend
 *
 * ************************************
 */


/*
 * Private helper function. Retrieves update data from rig.
 * using pacing value and buffer indicated in *priv struct.
 * Extended to be command agnostic as 900 has several ways to
 * get data and several ways to return it.
 *
 * Need to use this when doing ft900_get_* stuff
 *
 * Arguments:   *rig    Valid RIG instance
 *              ci      command index
 *              rl      expected length of returned data in octets
 *
 * Returns:     RIG_OK if all called functions are successful,
 *              otherwise returns error from called functiion
 */

static int ft900_get_update_data(RIG *rig, unsigned char ci, unsigned char rl)
{
    struct ft900_priv_data *priv;
    int err;
    int n;
    rig_debug(RIG_DEBUG_VERBOSE, "%s called\n", __func__);

    if (!rig)
    {
        return -RIG_EINVAL;
    }

    priv = (struct ft900_priv_data *)rig->state.priv;

    err = ft900_send_static_cmd(rig, ci);

    if (err != RIG_OK)
    {
        return err;
    }

    n = read_block(&rig->state.rigport, (char *) priv->update_data, rl);

    if (n < 0)
    {
        return n;    /* die returning read_block error */
    }

    rig_debug(RIG_DEBUG_TRACE, "%s: read %i bytes\n", __func__, n);

    return RIG_OK;
}


/*
 * Private helper function to send a complete command sequence.
 *
 * TODO: place variant of this in yaesu.c
 *
 * Arguments:   *rig    Valid RIG instance
 *              ci      Command index of the ncmd table
 *
 * Returns:     RIG_OK if all called functions are successful,
 *              otherwise returns error from called functiion
 */

static int ft900_send_static_cmd(RIG *rig, unsigned char ci)
{
    int err;

    rig_debug(RIG_DEBUG_VERBOSE, "%s called\n", __func__);

    if (!rig)
    {
        return -RIG_EINVAL;
    }

    if (!ncmd[ci].ncomp)
    {
        rig_debug(RIG_DEBUG_TRACE,
                  "%s: Attempt to send incomplete sequence\n", __func__);
        return -RIG_EINVAL;
    }

    err = write_block(&rig->state.rigport, (char *) ncmd[ci].nseq,
                      YAESU_CMD_LENGTH);

    if (err != RIG_OK)
    {
        return err;
    }

    return RIG_OK;
}


/*
 * Private helper function to build and then send a complete command
 * sequence.
 *
 * TODO: place variant of this in yaesu.c
 *
 * Arguments:   *rig    Valid RIG instance
 *              ci      Command index of the ncmd table
 *              p1-p4   Command parameters
 *
 * Returns:     RIG_OK if all called functions are successful,
 *              otherwise returns error from called functiion
 */

static int ft900_send_dynamic_cmd(RIG *rig, unsigned char ci,
                                  unsigned char p1, unsigned char p2,
                                  unsigned char p3, unsigned char p4)
{
    struct ft900_priv_data *priv;
    int err;

    rig_debug(RIG_DEBUG_VERBOSE, "%s called\n", __func__);

    if (!rig)
    {
        return -RIG_EINVAL;
    }

    rig_debug(RIG_DEBUG_TRACE, "%s: passed ci = %i\n", __func__, ci);
    rig_debug(RIG_DEBUG_TRACE,
              "%s: passed p1 = 0x%02x, p2 = 0x%02x, p3 = 0x%02x, p4 = 0x%02x,\n",
              __func__, p1, p2, p3, p4);

    priv = (struct ft900_priv_data *)rig->state.priv;

    if (ncmd[ci].ncomp)
    {
        rig_debug(RIG_DEBUG_TRACE,
                  "%s: Attempt to modify complete sequence\n", __func__);
        return -RIG_EINVAL;
    }

    memcpy(&priv->p_cmd, &ncmd[ci].nseq, YAESU_CMD_LENGTH);

    priv->p_cmd[P1] = p1;         /* ick */
    priv->p_cmd[P2] = p2;
    priv->p_cmd[P3] = p3;
    priv->p_cmd[P4] = p4;

    err = write_block(&rig->state.rigport, (char *) &priv->p_cmd,
                      YAESU_CMD_LENGTH);

    if (err != RIG_OK)
    {
        return err;
    }

    return RIG_OK;
}


/*
 * Private helper function to build and send a complete command to
 * change the display frequency.
 *
 * TODO: place variant of this in yaesu.c
 *
 * Arguments:   *rig    Valid RIG instance
 *              ci      Command index of the ncmd table
 *              freq    freq_t frequency value
 *
 * Returns:     RIG_OK if all called functions are successful,
 *              otherwise returns error from called functiion
 */

static int ft900_send_dial_freq(RIG *rig, unsigned char ci, freq_t freq)
{
    struct ft900_priv_data *priv;
    int err;
    // cppcheck-suppress *
    char *fmt = "%s: requested freq after conversion = %"PRIll" Hz\n";

    rig_debug(RIG_DEBUG_VERBOSE, "%s called\n", __func__);

    if (!rig)
    {
        return -RIG_EINVAL;
    }

    rig_debug(RIG_DEBUG_TRACE, "%s: passed ci = %i\n", __func__, ci);
    rig_debug(RIG_DEBUG_TRACE, "%s: passed freq = %"PRIfreq" Hz\n", __func__, freq);

    priv = (struct ft900_priv_data *)rig->state.priv;

    if (ncmd[ci].ncomp)
    {
        rig_debug(RIG_DEBUG_TRACE,
                  "%s: Attempt to modify complete sequence\n", __func__);
        return -RIG_EINVAL;
    }

    /* Copy native cmd freq_set to private cmd storage area */
    memcpy(&priv->p_cmd, &ncmd[ci].nseq, YAESU_CMD_LENGTH);

    /* store bcd format in in p_cmd */
    to_bcd(priv->p_cmd, freq / 10, FT900_BCD_DIAL);

    rig_debug(RIG_DEBUG_TRACE, fmt, __func__, (int64_t)from_bcd(priv->p_cmd,
              FT900_BCD_DIAL) * 10);

    err = write_block(&rig->state.rigport, (char *) &priv->p_cmd,
                      YAESU_CMD_LENGTH);

    if (err != RIG_OK)
    {
        return err;
    }

    return RIG_OK;
}


/*
 * Private helper function to build and send a complete command to
 * change the RIT frequency.
 *
 * TODO: place variant of this in yaesu.c
 *
 * Arguments:   *rig    Valid RIG instance
 *              ci      Command index of the ncmd table
 *              rit     shortfreq_t frequency value
 *              p1      P1 value -- CLAR_SET_FREQ
 *              p2      P2 value -- CLAR_OFFSET_PLUS || CLAR_OFFSET_MINUS
 *
 * Returns:     RIG_OK if all called functions are successful,
 *              otherwise returns error from called functiion
 *
 * Assumes:     rit doesn't exceed tuning limits of rig
 */

static int ft900_send_rit_freq(RIG *rig, unsigned char ci, shortfreq_t rit)
{
    struct ft900_priv_data *priv;
    unsigned char p1;
    unsigned char p2;
    int err;

    rig_debug(RIG_DEBUG_VERBOSE, "%s called\n", __func__);

    if (!rig)
    {
        return -RIG_EINVAL;
    }

    rig_debug(RIG_DEBUG_TRACE, "%s: passed ci = %i\n", __func__, ci);
    rig_debug(RIG_DEBUG_TRACE, "%s: passed rit = %li Hz\n", __func__, rit);

    priv = (struct ft900_priv_data *)rig->state.priv;

    if (ncmd[ci].ncomp)
    {
        rig_debug(RIG_DEBUG_TRACE,
                  "%s: Attempt to modify complete sequence\n", __func__);
        return -RIG_EINVAL;
    }

    p1 = CLAR_SET_FREQ;

    if (rit < 0)
    {
        rit = labs(rit);            /* get absolute value of rit */
        p2 = CLAR_OFFSET_MINUS;
    }
    else
    {
        p2 = CLAR_OFFSET_PLUS;
    }

    /* Copy native cmd clarifier ops to private cmd storage area */
    memcpy(&priv->p_cmd, &ncmd[ci].nseq, YAESU_CMD_LENGTH);

    /* store bcd format in in p_cmd */
    to_bcd(priv->p_cmd, rit / 10, FT900_BCD_RIT);

    rig_debug(RIG_DEBUG_TRACE,
              "%s: requested rit after conversion = %ld Hz\n",
              __func__, (long)from_bcd(priv->p_cmd, FT900_BCD_RIT) * 10);

    priv->p_cmd[P1] = p1;         /* ick */
    priv->p_cmd[P2] = p2;

    err = write_block(&rig->state.rigport, (char *) &priv->p_cmd,
                      YAESU_CMD_LENGTH);

    if (err != RIG_OK)
    {
        return err;
    }

    return RIG_OK;
}


