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jupiter.c

/*
 *  Hamlib TenTenc backend - TT-538 description
 *  Copyright (c) 2003-2005 by Stephane Fillod
 *
 *    $Id: jupiter.c,v 1.3 2005/02/26 22:29:52 fillods 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 <stdio.h>
#include <string.h>
#include <stdlib.h>

#include <hamlib/rig.h>
#include "tentec2.h"
#include "tentec.h"
#include "bandplan.h"

struct tt538_priv_data {
      int ch;     /* mem */
      vfo_t vfo_curr;
};


#define TT538_MODES (RIG_MODE_FM|RIG_MODE_CW|RIG_MODE_SSB|RIG_MODE_AM)
#define TT538_RXMODES (TT538_MODES)

#define TT538_FUNCS (RIG_FUNC_NR|RIG_FUNC_ANF)

#define TT538_LEVELS_OLD (RIG_LEVEL_RAWSTR|/*RIG_LEVEL_NB|*/ \
                        RIG_LEVEL_RF|RIG_LEVEL_IF| \
                        RIG_LEVEL_AF|RIG_LEVEL_AGC| \
                        RIG_LEVEL_SQL|RIG_LEVEL_ATT)

#define TT538_LEVELS (RIG_LEVEL_RAWSTR|/*RIG_LEVEL_NB|*/ \
                        RIG_LEVEL_SQL|/*RIG_LEVEL_IF|*/ \
                        RIG_LEVEL_RFPOWER|RIG_LEVEL_KEYSPD| \
                        RIG_LEVEL_RF|RIG_LEVEL_NR| \
                        /*RIG_LEVEL_ANF|*/RIG_LEVEL_MICGAIN| \
                        RIG_LEVEL_AF|RIG_LEVEL_AGC| \
                        RIG_LEVEL_VOXGAIN|RIG_LEVEL_VOX| \
                        RIG_LEVEL_COMP|/*RIG_LEVEL_PREAMP|*/ \
                        RIG_LEVEL_SWR|RIG_LEVEL_ATT)

#define TT538_ANTS (RIG_ANT_1) 

#define TT538_PARMS (RIG_PARM_NONE)

#define TT538_VFO (RIG_VFO_A|RIG_VFO_B)

#define TT538_VFO_OPS (RIG_OP_TO_VFO|RIG_OP_FROM_VFO)

#define TT538_AM  '0'
#define TT538_USB '1'
#define TT538_LSB '2'
#define TT538_CW  '3'
#define TT538_FM  '4'
#define EOM "\015"      /* CR */

static int tt538_init(RIG *rig);
static int tt538_reset(RIG *rig, reset_t reset);
static int tt538_get_freq(RIG *rig, vfo_t vfo, freq_t *freq);
static int tt538_set_freq(RIG *rig, vfo_t vfo, freq_t freq);
static int tt538_set_vfo(RIG *rig, vfo_t vfo);
static int tt538_get_vfo(RIG *rig, vfo_t *vfo);
static int tt538_get_mode(RIG *rig, vfo_t vfo, rmode_t *mode, pbwidth_t *width);
static int tt538_set_mode(RIG *rig, vfo_t vfo, rmode_t mode, pbwidth_t width);
static char which_vfo(const RIG *rig, vfo_t vfo);
static int tt538_get_level(RIG *rig, vfo_t vfo, setting_t level, value_t *val);

/*
 * tt538 transceiver capabilities.
 *
 * Protocol is documented at 
 *          http://www.rfsquared.com/
 *
 * Only set_freq is supposed to work.
 * This is a skelton.
 */
const struct rig_caps tt538_caps = {
.rig_model =  RIG_MODEL_TT538,
.model_name = "TT-538 Jupiter",
.mfg_name =  "Ten-Tec",
.version =  "0.2",
.copyright =  "LGPL",
.status =  RIG_STATUS_ALPHA,
.rig_type =  RIG_TYPE_TRANSCEIVER,
.ptt_type =  RIG_PTT_RIG,
.dcd_type =  RIG_DCD_NONE,
.port_type =  RIG_PORT_SERIAL,
.serial_rate_min =  57600,
.serial_rate_max =  57600,
.serial_data_bits =  8,
.serial_stop_bits =  1,
.serial_parity =  RIG_PARITY_NONE,
.serial_handshake =  RIG_HANDSHAKE_HARDWARE,
.write_delay =  0,
.post_write_delay =  0,
.timeout =  400,
.retry =  3,

.has_get_func =  TT538_FUNCS,
.has_set_func =  TT538_FUNCS,
.has_get_level =  TT538_LEVELS,
.has_set_level =  RIG_LEVEL_SET(TT538_LEVELS),
.has_get_parm =  TT538_PARMS,
.has_set_parm =  TT538_PARMS,
.level_gran =  {},                 /* FIXME: granularity */
.parm_gran =  {},
.ctcss_list =  NULL,
.dcs_list =  NULL,
.preamp =   { RIG_DBLST_END },
.attenuator =   { 15, RIG_DBLST_END },
.max_rit =  Hz(0),
.max_xit =  Hz(0),
.max_ifshift =  kHz(2),
.targetable_vfo =  RIG_TARGETABLE_FREQ|RIG_TARGETABLE_MODE,
.transceive =  RIG_TRN_OFF,
.bank_qty =   0,
.chan_desc_sz =  0,

.chan_list =  {
            {   0, 127, RIG_MTYPE_MEM, TT_MEM_CAP },
            },

.rx_range_list1 =  {
      {kHz(100),MHz(30),TT538_RXMODES,-1,-1,TT538_VFO,TT538_ANTS},
      RIG_FRNG_END,
  },
.tx_range_list1 =  {
      FRQ_RNG_HF(1,TT538_MODES, W(5),W(100),TT538_VFO,TT538_ANTS),
      RIG_FRNG_END,
  },

.rx_range_list2 =  {
      {kHz(100),MHz(30),TT538_RXMODES,-1,-1,TT538_VFO,TT538_ANTS},
      RIG_FRNG_END,
  },
.tx_range_list2 =  {
      FRQ_RNG_HF(2,TT538_MODES, W(5),W(100),TT538_VFO,TT538_ANTS),
      {MHz(5.25),MHz(5.40),TT538_MODES,W(5),W(100),TT538_VFO,TT538_ANTS},
      RIG_FRNG_END,
  },

.tuning_steps =  {
       {TT538_RXMODES,1},
       {TT538_RXMODES,10},
       {TT538_RXMODES,100},
       {TT538_RXMODES,kHz(1)},
       {TT538_RXMODES,kHz(10)},
       {TT538_RXMODES,kHz(100)},
       RIG_TS_END,
      },
        /* mode/filter list, remember: order matters! */
.filters =  {
            {RIG_MODE_CW|RIG_MODE_SSB|RIG_MODE_AM, kHz(2.4)},
            {RIG_MODE_CW|RIG_MODE_SSB|RIG_MODE_AM, 300},
            {RIG_MODE_CW|RIG_MODE_SSB|RIG_MODE_AM, kHz(8)},
            {RIG_MODE_CW|RIG_MODE_SSB|RIG_MODE_AM, 0}, /* 34 filters */
            {RIG_MODE_FM, kHz(15)}, /* TBC */
            RIG_FLT_END,
      },
.priv =  (void*) NULL,

.rig_init =  tt538_init,
.set_freq =  tt538_set_freq,
.get_freq =  tt538_get_freq,
.set_vfo =  tt538_set_vfo,
.get_vfo =  tt538_get_vfo,
.set_mode =  tt538_set_mode,
.get_mode =  tt538_get_mode,
.get_level =  tt538_get_level,
.set_split_vfo =  tentec2_set_split_vfo,
.get_split_vfo =  tentec2_get_split_vfo,
.set_ptt =  tentec2_set_ptt,
.reset =  tt538_reset,
.get_info =  tentec2_get_info,

};

/* Filter table for 538 reciver support. */
static int tt538_rxFilter[] = {
  8000, 6000, 5700, 5400, 5100, 4800, 4500, 4200, 3900, 3600, 3300,
  3000, 2850, 2700, 2550, 2400, 2250, 2100, 1950, 1800, 1650, 1500,
  1350, 1200, 1050, 900, 750, 675, 600, 525, 450, 375, 330, 300
};

/*
 * Function definitions below
 */

/* I frequently see the Jupiter and my laptop get out of sync.  A
   response from the 538 isn't seen by the laptop.  A few "XX"s
   sometimes get things going again, hence this hack, er, function. */

static int tt538_transaction (RIG *rig, const char *cmd, int cmd_len,
      char *data, int *data_len)
{
      char  reset_buf[32];
      int   i, reset_len, retval;

      retval = tentec_transaction (rig, cmd, cmd_len, data, data_len);
      if (retval == RIG_OK)
            return retval;

      /* Try a few times to do a DSP reset to resync things. */
      for (i = 0; i < 3; i++) {
            reset_len = 32;
            retval = tentec_transaction (rig, "XX" EOM, 3, reset_buf, &reset_len);
            if (retval != RIG_OK)
                  continue; /* Try again.  This 1 didn't work. */
            if (strstr(reset_buf, "RADIO START"))
                  break; /* DSP reset successful! */
      }

      /* Try real command one last time... */
      return tentec_transaction (rig, cmd, cmd_len, data, data_len);
}

/*
 * tt538_init:
 * Basically, it just sets up *priv
 */
int tt538_init(RIG *rig)
{
      struct tt538_priv_data *priv;

      priv = (struct tt538_priv_data *) malloc(sizeof(struct tt538_priv_data));
      if (!priv) {
            /* whoops! memory shortage! */
            return -RIG_ENOMEM;
      }

      memset(priv, 0, sizeof(struct tt538_priv_data));

      /*
       * set arbitrary initial status
       */
      priv->ch = 0;
      priv->vfo_curr = RIG_VFO_A;
      rig->state.priv = (rig_ptr_t)priv;

      return RIG_OK;
}

static char which_vfo(const RIG *rig, vfo_t vfo)
{
      struct tt538_priv_data *priv = (struct tt538_priv_data *)rig->state.priv;

      if (vfo == RIG_VFO_CURR)
            vfo = priv->vfo_curr;

      switch (vfo) {
      case RIG_VFO_A: return 'A';
      case RIG_VFO_B: return 'B';
      case RIG_VFO_NONE: return 'N';
      default:
            rig_debug(RIG_DEBUG_ERR,"%s: unsupported VFO %s\n",
                        __FUNCTION__, rig_strvfo(vfo));
            return -RIG_EINVAL;
      }
}

int tt538_get_vfo(RIG *rig, vfo_t *vfo) {

      struct tt538_priv_data *priv = (struct tt538_priv_data *) rig->state.priv;
      *vfo = priv->vfo_curr;
      return RIG_OK;
}

/*
 * tt538_set_vfo
 * Assumes rig!=NULL
 */
int tt538_set_vfo(RIG *rig, vfo_t vfo)
{
      struct tt538_priv_data *priv = (struct tt538_priv_data *)rig->state.priv;

      if (vfo == RIG_VFO_CURR)
            return RIG_OK;

      priv->vfo_curr = vfo;
      return RIG_OK;
}

/*
 * Software restart
 */
int tt538_reset(RIG *rig, reset_t reset) {
      int retval, reset_len;
      char reset_buf[32];

      reset_len = 32;
      retval = tt538_transaction (rig, "XX" EOM, 3, reset_buf, &reset_len);
      if (retval != RIG_OK)
            return retval;

      if (!strstr(reset_buf, "RADIO START")) {
            rig_debug(RIG_DEBUG_ERR, "%s: unexpected answer '%s'\n",
                              __FUNCTION__, reset_buf);
            return -RIG_EPROTO;
      }

      return RIG_OK;
}

/*
 * tt538_get_freq
 * Assumes rig!=NULL, freq!=NULL
 */
int tt538_get_freq(RIG *rig, vfo_t vfo, freq_t *freq) {

      char  curVfo;
      int cmd_len, resp_len, retval;
      unsigned char cmdbuf[16], respbuf[32];

      cmd_len = sprintf(cmdbuf, "?%c" EOM, which_vfo(rig, vfo));
      resp_len = 32;
      retval = tt538_transaction (rig, cmdbuf, cmd_len, respbuf, &resp_len);

      if (retval != RIG_OK) 
            return retval;

      curVfo = which_vfo(rig, vfo);
      if (respbuf[0] != curVfo) {
            rig_debug(RIG_DEBUG_ERR, "%s: unexpected answer '%s'\n",
                  __FUNCTION__, respbuf);
            return -RIG_EPROTO;
      }
      if (resp_len != 6) {
            rig_debug(RIG_DEBUG_ERR, "%s: unexpected length '%d'\n",
                  __FUNCTION__, resp_len);
            return -RIG_EPROTO;
      }

      *freq = (respbuf[1] << 24)
            + (respbuf[2] << 16)
            + (respbuf[3] << 8)
            + respbuf[4];

      return RIG_OK;
}

/*
 * tt538_set_freq
 * assumes rig!=NULL, rig->state.priv!=NULL
 * assumes priv->mode in AM,CW,LSB or USB.
 */

int tt538_set_freq(RIG *rig, vfo_t vfo, freq_t freq)
{
      char  bytes[4];
      int cmd_len;
      unsigned char cmdbuf[16];

      /* Freq is 4 bytes long, MSB sent first. */
      bytes[3] = ((int) freq >> 24) & 0xff;
      bytes[2] = ((int) freq >> 16) & 0xff;
      bytes[1] = ((int) freq >>  8) & 0xff;
      bytes[0] =  (int) freq        & 0xff;

      cmd_len = sprintf(cmdbuf, "*%c%c%c%c%c" EOM,
            which_vfo(rig, vfo),
                  bytes[3], bytes[2], bytes[1], bytes[0]);

      return tt538_transaction(rig, cmdbuf, cmd_len, NULL, NULL); 
}

/*
 * tt538_get_mode
 * Assumes rig!=NULL, mode!=NULL
 */
int tt538_get_mode(RIG *rig, vfo_t vfo, rmode_t *mode, pbwidth_t *width)
{
      int cmd_len, resp_len, retval;
      unsigned char cmdbuf[16], respbuf[32];
      char ttmode;

      /* Query mode */
      cmd_len = sprintf(cmdbuf, "?M" EOM);
      resp_len = 32;
      retval = tt538_transaction (rig, cmdbuf, cmd_len, respbuf, &resp_len);

      if (retval != RIG_OK)
            return retval;

      if (respbuf[0] != 'M' || resp_len != 4) {
            rig_debug(RIG_DEBUG_ERR, "%s: unexpected answer '%s'\n",
                  __FUNCTION__, respbuf);
            return -RIG_EPROTO;
      }

      switch (which_vfo(rig, vfo)) {
      case 'A':
            ttmode = respbuf[1]; 
            break;
      case 'B':
            ttmode = respbuf[2]; 
            break;
      default:
            rig_debug(RIG_DEBUG_ERR,"%s: unsupported VFO %s\n",
                  __FUNCTION__, rig_strvfo(vfo));
            return -RIG_EINVAL;
            break;
      }

      switch (ttmode) {
      case TT538_AM:    *mode = RIG_MODE_AM;  break;
      case TT538_USB: *mode = RIG_MODE_USB; break;
      case TT538_LSB: *mode = RIG_MODE_LSB; break;
      case TT538_CW: *mode = RIG_MODE_CW;  break;
      case TT538_FM: *mode = RIG_MODE_FM;  break;
      default:
            rig_debug(RIG_DEBUG_ERR, "%s: unsupported mode '%c'\n",
                  __FUNCTION__, ttmode);
            return -RIG_EPROTO;
      }

      /* Query passband width (filter) */
      cmd_len = sprintf(cmdbuf, "?W" EOM);
      resp_len = 32;
      retval = tt538_transaction (rig, cmdbuf, cmd_len, respbuf, &resp_len);

      if (retval != RIG_OK)
            return retval;

      if (respbuf[0] != 'W' && resp_len != 3) {
            rig_debug(RIG_DEBUG_ERR, "%s: unexpected answer '%s'\n",
                  __FUNCTION__, respbuf);
            return -RIG_EPROTO;
      }

      switch (respbuf[1]) {
      case 0: *width = 8000; break;
      case 1: *width = 6000; break;
      case 2: *width = 5700; break;
      case 3: *width = 5400; break;
      case 4: *width = 5100; break;
      case 5: *width = 4800; break;
      case 6: *width = 4500; break;
      case 7: *width = 4200; break;
      case 8: *width = 3900; break;
      case 9: *width = 3600; break;
      case 10: *width = 3300; break;
      case 11: *width = 3000; break;
      case 12: *width = 2850; break;
      case 13: *width = 2700; break;
      case 14: *width = 2550; break;
      case 15: *width = 2400; break;
      case 16: *width = 2250; break;
      case 17: *width = 2100; break;
      case 18: *width = 1950; break;
      case 19: *width = 1800; break;
      case 20: *width = 1650; break;
      case 21: *width = 1500; break;
      case 22: *width = 1350; break;
      case 23: *width = 1200; break;
      case 24: *width = 1050; break;
      case 25: *width = 900; break;
      case 26: *width = 750; break;
      case 27: *width = 675; break;
      case 28: *width = 600; break;
      case 29: *width = 525; break;
      case 30: *width = 450; break;
      case 31: *width = 375; break;
      case 32: *width = 330; break;
      case 33: *width = 300; break;
      default:
            rig_debug(RIG_DEBUG_ERR, "%s: unexpected bandwidth '%c'\n",
                  __FUNCTION__, respbuf[1]);
            return -RIG_EPROTO;
      }

      return RIG_OK;
}

/* Find rx filter index of bandwidth the same or larger as requested. */
static int tt538_filter_number(int width)
{
      int   i;

      for (i = 34; i >= 0; i--)
            if (width <= tt538_rxFilter[i])
                  return i;
      return 0; /* Widest filter, 8 kHz. */
}


/*
 * tt538_set_mode
 * Assumes rig!=NULL
 */
int tt538_set_mode(RIG *rig, vfo_t vfo, rmode_t mode, pbwidth_t width)
{
      unsigned char cmdbuf[32], respbuf[32], ttmode;
      int cmd_len, resp_len, retval;

      struct tt538_priv_data *priv = (struct tt538_priv_data *) rig->state.priv;

      /* Query mode for both VFOs. */
      cmd_len = sprintf(cmdbuf, "?M" EOM);
      resp_len = 32;
      retval = tt538_transaction (rig, cmdbuf, cmd_len, respbuf, &resp_len);
      if (retval != RIG_OK)
            return retval;
      if (respbuf[0] != 'M' || resp_len != 4) {
            rig_debug(RIG_DEBUG_ERR, "%s: unexpected answer '%s'\n",
                  __FUNCTION__, respbuf);
            return -RIG_EPROTO;
      }

      switch (mode) {
      case RIG_MODE_USB:      ttmode = TT538_USB; break;
      case RIG_MODE_LSB:      ttmode = TT538_LSB; break;
      case RIG_MODE_CW: ttmode = TT538_CW; break;
      case RIG_MODE_AM: ttmode = TT538_AM; break;
      case RIG_MODE_FM: ttmode = TT538_FM; break;
      default:
            rig_debug(RIG_DEBUG_ERR, "%s: unsupported mode %d\n",
                  __FUNCTION__, mode);
            return -RIG_EINVAL;
      }

      /* Set mode for both VFOs. */
      if (vfo == RIG_VFO_CURR)
            vfo = priv->vfo_curr;
      switch (vfo) {
      case RIG_VFO_A:
            cmd_len = sprintf(cmdbuf, "*M%c%c" EOM, ttmode, respbuf[2]);
            break;
      case RIG_VFO_B:
            cmd_len = sprintf(cmdbuf, "*M%c%c" EOM, respbuf[1], ttmode);
            break;
      default:
            rig_debug(RIG_DEBUG_ERR,"%s: unsupported VFO %s\n",
                        __FUNCTION__, rig_strvfo(vfo));
            return -RIG_EINVAL;
      }

      retval = tt538_transaction (rig, cmdbuf, cmd_len, NULL, NULL);
      if (retval != RIG_OK)
            return retval;

      /* Set rx filter bandwidth. */

      if (width == RIG_PASSBAND_NORMAL)
            width = tt538_filter_number(rig_passband_normal(rig, mode));
      else
            width = tt538_filter_number((int) width);

      cmd_len = sprintf(cmdbuf, "*W%c" EOM, (unsigned char) width); 
      return tt538_transaction (rig, cmdbuf, cmd_len, NULL, NULL);
}

/*
 * tt538_get_level
 * Assumes rig!=NULL, val!=NULL
 */
int tt538_get_level(RIG *rig, vfo_t vfo, setting_t level, value_t *val)
{
      char  sunits[6];
      float fwd, refl, sstr;
      int retval, cmd_len, lvl_len;
      unsigned char cmdbuf[16],lvlbuf[32];


      /* Optimize:
       *   sort the switch cases with the most frequent first
       */
      switch (level) {
      case RIG_LEVEL_SWR:
            /* Get forward power. */
            lvl_len = 32;
            retval = tt538_transaction (rig, "?F" EOM, 3, lvlbuf, &lvl_len);
            if (retval != RIG_OK)
                  return retval;
            if (lvlbuf[0] != 'F' || lvl_len != 3) {
                  rig_debug(RIG_DEBUG_ERR,"%s: unexpected answer '%s'\n",
                              __FUNCTION__, lvlbuf);
                  return -RIG_EPROTO;
            }
            fwd = (float) lvlbuf[1];

            /* Get reflected power. */
            lvl_len = 32;
            retval = tt538_transaction (rig, "?R" EOM, 3, lvlbuf, &lvl_len);
            if (retval != RIG_OK)
                  return retval;
            if (lvlbuf[0] != 'R' || lvl_len != 3) {
                  rig_debug(RIG_DEBUG_ERR,"%s: unexpected answer '%s'\n",
                              __FUNCTION__, lvlbuf);
                  return -RIG_EPROTO;
            }
            refl = (float) lvlbuf[1];

            val->f = fwd/refl;
            break;

      case RIG_LEVEL_RAWSTR:
            retval = tt538_transaction (rig, "?S" EOM, 3, lvlbuf, &lvl_len);
            if (retval != RIG_OK)
                  return retval;

            if (lvlbuf[0] != 'S' || lvl_len != 6) {
                  rig_debug(RIG_DEBUG_ERR,"%s: unexpected answer '%s'\n",
                              __FUNCTION__, lvlbuf);
                  return -RIG_EPROTO;
            }

#if 0
            sprintf(sunits, "%c%c.%c%c",
                  lvlbuf[1], lvlbuf[2], lvlbuf[3], lvlbuf[4]);
            sscanf(sunits, "%f", &sstr);
            val->f = sstr;
printf("%f\n", val->f);
#endif

            sprintf(sunits, "%c%c.%c%c",
                  lvlbuf[1], lvlbuf[2], lvlbuf[3], lvlbuf[4]);
            sscanf(sunits, "%f", &sstr);
            val->i = (int) sstr;

            break;

      case RIG_LEVEL_RFPOWER:

            /* Get forward power in volts. */
            lvl_len = 32;
            retval = tt538_transaction (rig, "?P" EOM, 3, lvlbuf, &lvl_len);
            if (retval != RIG_OK)
                  return retval;
            if (lvlbuf[0] != 'P' || lvl_len != 4) {
                  rig_debug(RIG_DEBUG_ERR,"%s: unexpected answer '%s'\n",
                              __FUNCTION__, lvlbuf);
                  return -RIG_EPROTO;
            }
            val->f = 100 * (float) lvlbuf[1] / 0xff;

            break;

      case RIG_LEVEL_AGC:

            /* Read rig's AGC level setting. */
            cmd_len = sprintf(cmdbuf, "?G" EOM);
            lvl_len = 32;
            retval = tt538_transaction (rig, cmdbuf, cmd_len, lvlbuf, &lvl_len);
            if (retval != RIG_OK)
                  return retval;
            if (lvlbuf[0] != 'G' || lvl_len != 3) {
                  rig_debug(RIG_DEBUG_ERR,"%s: unexpected answer '%s'\n",
                              __FUNCTION__, lvlbuf);
                  return -RIG_EPROTO;
            }

            switch(lvlbuf[1]) {
            case '1': val->i=RIG_AGC_SLOW; break;
            case '2': val->i=RIG_AGC_MEDIUM; break;
            case '3': val->i=RIG_AGC_FAST; break;
            default: return -RIG_EPROTO;
            }
            break;

      case RIG_LEVEL_AF:

            /* Volume returned as single byte. */
            cmd_len = sprintf(cmdbuf, "?U" EOM);
            lvl_len = 32;
            retval = tt538_transaction (rig, cmdbuf, cmd_len, lvlbuf, &lvl_len);
            if (retval != RIG_OK)
                  return retval;

            if (lvlbuf[0] != 'U' || lvl_len != 3) {
                  rig_debug(RIG_DEBUG_ERR,"%s: unexpected answer '%s'\n",
                              __FUNCTION__, lvlbuf);
                  return -RIG_EPROTO;
            }

            val->f = (float) lvlbuf[1] / 127;
            break;

      case RIG_LEVEL_IF:
#if 0
NO IF MONITOR??
            cmd_len = sprintf(cmdbuf, "?R%cP" EOM,
                        which_receiver(rig, vfo));

            retval = tt538_transaction (rig, cmdbuf, cmd_len, lvlbuf, &lvl_len);
            if (retval != RIG_OK)
                  return retval;

            if (lvlbuf[1] != 'R' || lvlbuf[3] != 'P' || lvl_len < 5) {
                  rig_debug(RIG_DEBUG_ERR,"%s: unexpected answer '%s'\n",
                              __FUNCTION__, lvlbuf);
                  return -RIG_EPROTO;
            }

            val->i = atoi(lvlbuf+4);
#endif
            val->i = 0;
            break;

      case RIG_LEVEL_RF:

            cmd_len = sprintf(cmdbuf, "?I" EOM);
            lvl_len = 32;
            retval = tt538_transaction (rig, cmdbuf, cmd_len, lvlbuf, &lvl_len);
            if (retval != RIG_OK)
                  return retval;

            if (lvlbuf[0] != 'I' || lvl_len != 3) {
                  rig_debug(RIG_DEBUG_ERR,"%s: unexpected answer '%s'\n",
                              __FUNCTION__, lvlbuf);
                  return -RIG_EPROTO;
            }

            val->f = 1 - (float) lvlbuf[1] / 0xff;
            break;

      case RIG_LEVEL_ATT:

            cmd_len = sprintf(cmdbuf, "?J" EOM);
            lvl_len = 32;
            retval = tt538_transaction (rig, cmdbuf, cmd_len, lvlbuf, &lvl_len);
            if (retval != RIG_OK)
                  return retval;
            if (lvlbuf[0] != 'J' || lvl_len != 3) {
                  rig_debug(RIG_DEBUG_ERR,"%s: unexpected answer '%s'\n",
                              __FUNCTION__, lvlbuf);
                  return -RIG_EPROTO;
            }
            val->i = lvlbuf[1];
            break;

      case RIG_LEVEL_PREAMP:
            /* Receiver does not contain a preamp */
            val->i=0;
            break;

      case RIG_LEVEL_SQL:

            cmd_len = sprintf(cmdbuf, "?H" EOM);
            lvl_len = 32;
            retval = tt538_transaction (rig, cmdbuf, cmd_len, lvlbuf, &lvl_len);
            if (retval != RIG_OK)
                  return retval;
            if (lvlbuf[0] != 'H' || lvl_len != 3) {
                  rig_debug(RIG_DEBUG_ERR,"%s: unexpected answer '%s'\n",
                              __FUNCTION__, lvlbuf);
                  return -RIG_EPROTO;
            }
            val->f = ((float) lvlbuf[1] / 127);
            break;

      case RIG_LEVEL_MICGAIN:

            lvl_len = 3;
            retval = tt538_transaction (rig, "?O" EOM, 3, lvlbuf, &lvl_len);
            if (retval != RIG_OK)
                  return retval;

            if (lvlbuf[0] != 'O' || lvl_len != 3) {
                  rig_debug(RIG_DEBUG_ERR,"%s: unexpected answer '%s'\n",
                              __FUNCTION__, lvlbuf);
                  return -RIG_EPROTO;
            }

            val->f = (float) lvlbuf[2] / 0x0f;
            break;

      case RIG_LEVEL_COMP:
            /* Query S units signal level. */
            lvl_len = 32;
            retval = tt538_transaction (rig, "?S" EOM, 3, lvlbuf, &lvl_len);
            if (retval != RIG_OK)
                  return retval;

            if (lvlbuf[0] != 'S' || lvl_len != 6) {
                  rig_debug(RIG_DEBUG_ERR,"%s: unexpected answer '%s'\n",
                              __FUNCTION__, lvlbuf);
                  return -RIG_EPROTO;
            }

            sprintf(sunits, "%c%c.%c%c",
                  lvlbuf[1], lvlbuf[2], lvlbuf[3], lvlbuf[4]);
            sscanf(sunits, "%f", &sstr);
printf("%f\n", sstr);
            val->f = sstr;
            break;


      default:
            rig_debug(RIG_DEBUG_ERR,"%s: unsupported level %d\n", 
                        __FUNCTION__, level);
            return -RIG_EINVAL;
      }

      return RIG_OK;
}


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