CHIRP

# Copyright 2021 Jim Unroe <rock.unroe@gmail.com>

#

# This program is free software: you can redistribute it and/or modify

# it under the terms of the GNU 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 General Public License for more details.

#

# You should have received a copy of the GNU General Public License

# along with this program.  If not, see <http://www.gnu.org/licenses/>.

import os

import struct

import time

import logging

from chirp import bitwise

from chirp import chirp_common

from chirp import directory

from chirp import errors

from chirp import memmap

from chirp import util

from chirp.settings import RadioSettingGroup, RadioSetting, RadioSettings, \

    RadioSettingValueList, RadioSettingValueString, RadioSettingValueBoolean, \

    RadioSettingValueInteger, RadioSettingValueString, \

    RadioSettingValueFloat, InvalidValueError

LOG = logging.getLogger(__name__)

#

#  Chirp Driver for Retevis RT98 models: RT98V (136-174 Mhz)

#                                        RT98U (400-490 Mhz)

#

#

#

# Global Parameters

#

TONES = [62.5] + list(chirp_common.TONES)

TMODES = ['', 'Tone', 'DTCS']

DUPLEXES = ['', '+', '-']

TXPOWER_LOW = 0x00

TXPOWER_MED = 0x01

TXPOWER_HIGH = 0x02

DUPLEX_NOSPLIT = 0x00

DUPLEX_POSSPLIT = 0x01

DUPLEX_NEGSPLIT = 0x02

CHANNEL_WIDTH_12d5kHz = 0x00

CHANNEL_WIDTH_20kHz = 0x01

CHANNEL_WIDTH_25kHz = 0x02

TUNING_STEPS = [2.5, 5.0, 6.25, 10.0, 12.5, 20.0, 25.0, 30.0, 50.0]

POWER_LEVELS = [chirp_common.PowerLevel("Low", watts=5),

                chirp_common.PowerLevel("Mid", watts=10),

                chirp_common.PowerLevel("High", watts=15)]

PMR_POWER_LEVELS = [chirp_common.PowerLevel("Low", watts=0.5), ]

FREENET_POWER_LEVELS = [chirp_common.PowerLevel("Low", watts=1), ]

PMR_FREQS = [446.00625, 446.01875, 446.03125, 446.04375,

             446.05625, 446.06875, 446.08125, 446.09375,

             446.10625, 446.11875, 446.13125, 446.14375,

             446.15625, 446.16875, 446.18125, 446.19375]

FREENET_FREQS = [149.02500, 149.03750, 149.05000,

                 149.08750, 149.10000, 149.11250]

CROSS_MODES = ["Tone->Tone", "DTCS->", "->DTCS", "Tone->DTCS", "DTCS->Tone",

               "->Tone", "DTCS->DTCS"]

LIST_STEP = [str(x) for x in TUNING_STEPS]

LIST_TIMEOUT = ["Off"] + ["%s min" % x for x in range(1, 31)]

LIST_APO = ["Off", "30 min", "1 hr", "2 hrs"]

LIST_SQUELCH = ["Off"] + ["Level %s" % x for x in range(1, 10)]

LIST_DISPLAY_MODE = ["Channel", "Frequency", "Name"]

LIST_AOP = ["Manual", "Auto"]

LIST_STE_TYPE = ["Off", "Silent", "120 Degree", "180 Degree", "240 Degree"]

LIST_STE_FREQ = ["Off", "55.2 Hz", "259.2 Hz"]

LIST_VFOMR = ["MR", "VFO"]

LIST_SCAN = ["TO", "CO", "SE"]

LIST_PRIORITY_CH = ["Off", "Priority Channel 1", "Priority Channel 2",

                    "Priority Channel 1 + Priority Channel 2"]

LIST_REVERT_CH = ["Selected", "Selected + TalkBack", "Priority Channel 1",

                  "Priority Channel 2", "Last Called", "Last Used",

                  "Priority Channel 1 + TalkBack",

                  "Priority Channel 2 + TalkBack"]

LIST_TIME50 = ["0.1", "0.2", "0.3", "0.4", "0.5",

               "0.6", "0.7", "0.8", "0.9", "1.0",

               "1.1", "1.2", "1.3", "1.4", "1.5",

               "1.6", "1.7", "1.8", "1.9", "2.0",

               "2.1", "3.2", "2.3", "2.4", "2.5",

               "2.6", "2.7", "2.8", "2.9", "3.0",

               "3.1", "3.2", "3.3", "3.4", "3.5",

               "3.6", "3.7", "3.8", "3.9", "4.0",

               "4.1", "4.2", "4.3", "4.4", "4.5",

               "4.6", "4.7", "4.8", "4.9", "5.0"]

LIST_TIME46 = LIST_TIME50[4:]

LIST_RT98V_MODES = ["FreeNet", "COM", "COMII"]

LIST_RT98U_MODES = ["PMR", "COM", "COMII"]

LIST_RT98V_FREQS = ["Rx(149 - 149.2 MHz) Tx(149 - 149.2 MHz)",

                    "Rx(136 - 174 MHz) Tx(136 - 174 MHz)",

                    "Rx(147 - 174 MHz) Tx(147 - 174 MHz)"]

LIST_RT98U_FREQS = ["Rx(446 - 446.2 MHz) Tx(446 - 446.2 MHz)",

                    "Rx(400 - 470 MHz) Tx(400 - 470 MHz)",

                    "Rx(450 - 470 MHz) Tx(450 - 470 MHz)"]

SETTING_LISTS = {

        "tuning_step": LIST_STEP,

        "timeout_timer": LIST_TIMEOUT,

        "auto_power_off": LIST_APO,

        "squelch": LIST_SQUELCH,

        "display_mode": LIST_DISPLAY_MODE,

        "auto_power_on": LIST_AOP,

        "ste_type": LIST_STE_TYPE,

        "ste_frequency": LIST_STE_FREQ,

        "priority_ch": LIST_PRIORITY_CH,

        "revert_ch": LIST_REVERT_CH,

        "settings2.dropout_delay_time": LIST_TIME50,

        "settings2.dwell_time": LIST_TIME50,

        "settings2.look_back_time_a": LIST_TIME46,

        "settings2.look_back_time_b": LIST_TIME46,

        "settings3.vfomr": LIST_VFOMR,

        "settings.scan": LIST_SCAN

}

#  RT98  memory map

#  section: 1  Channel Bank

#         description of channel bank (199 channels , range 1-199)

#         Each 32 Byte (0x20 hex)  record:

#  bytes:bit  type                 description

#  ---------------------------------------------------------------------------

#  4          bbcd freq[4]         receive frequency in packed binary coded

#                                  decimal

#  4          bbcd offset[4]       transceive offset in packed binary coded

#                                  decimal (note: +/- direction set by

#                                  'duplex' field)

#  1          u8 unknown0

#  1          u8

#   :1        reverse:1            reverse flag, 0=off, 1=on (reverses

#                                  transmit and receive freqencies)

#   :1        txoff:1              transmitt off flag, 0=transmit, 1=do not

#                                  transmit

#   :2        power:2              transmit power setting, value range 0-2,

#                                  0=low, 1=middle, 2=high

#   :2        duplex:2             duplex settings, 0=simplex, 1=plus (+)

#                                  offset, 2=minus(-) offset (see offset field)

#   :2        channel_width:2      channel spacing, 0=12.5kHz, 1=20kHz, 2=25kHz

#  1          u8

#   :2        unknown1:2

#   :1        talkaround:1         talkaround flag, 0=off, 1=on

#                                  (bypasses repeater)

#   :1        squelch_mode:1       squelch mode flag, 0=carrier, 1=ctcss/dcs

#   :1        rxdcsextra:1         use with rxcode for index of rx DCS to use

#   :1        rxinv:1              inverse DCS rx polarity flag, 0=N, 1=I

#   :1        txdcsextra:1         use with txcode for index of tx DCS to use

#   :1        txinv:1              inverse DCS tx polarity flag, 0=N, 1=I

#  1          u8

#   :4        unknown2:4

#   :2        rxtmode:2            rx tone mode, value range 0-2, 0=none,

#                                  1=CTCSS, 2=DCS  (ctcss tone in field rxtone)

#   :2        txtmode:2            tx tone mode, value range 0-2, 0=none,

#                                  1=CTCSS, 3=DCS  (ctcss tone in field txtone)

#  1          u8

#   :2        unknown3:2

#   :6        txtone:6             tx ctcss tone, menu index

#  1          u8

#   :2        unknown4:2

#   :6        rxtone:6             rx ctcss tone, menu index

#  1          u8 txcode            ?, not used for ctcss

#  1          u8 rxcode            ?, not used for ctcss

#  1          u8

#   :6        unknown5:6

#   :1        busychannellockout:1 busy channel lockout flag, 0=off, 1=enabled

#   :1        unknown6:1

#  6          char name[6]         6 byte char string for channel name

#  9          u8 unknown7[9]

#

MEM_FORMAT = """

#seekto 0x0000;

struct {

  bbcd freq[4];

  bbcd offset[4];

  u8 unknown0;

  u8 reverse:1,

     tx_off:1,

     txpower:2,

     duplex:2,

     channel_width:2;

  u8 unknown1:2,

     talkaround:1,

     squelch_mode:1,

     rxdcsextra:1,

     rxinv:1,

     txdcsextra:1,

     txinv:1;

  u8 unknown2:4,

     rxtmode:2,

     txtmode:2;

  u8 unknown3:2,

     txtone:6;

  u8 unknown4:2,

     rxtone:6;

  u8 txcode;

  u8 rxcode;

  u8 unknown5:6,

     busychannellockout:1,

     unknown6:1;

  char name[6];

  u8 unknown7[9];

} memory[199];

"""

#  RT98  memory map

#  section: 2 and 3  Channel Set/Skip Flags

#

#    Channel Set (starts 0x3240) : Channel Set  bit is value 0 if a memory

#                                  location in the channel bank is active.

#    Channel Skip (starts 0x3260): Channel Skip bit is value 0 if a memory

#                                  location in the channel bank is active.

#

#    Both flag maps are a total 24 bytes in length, aligned on 32 byte records.

#    bit = 0 channel not set/skip,  1 is channel set/no skip

#

#    to index a channel:

#        cbyte = channel / 8 ;

#        cbit  = channel % 8 ;

#        setflag  = csetflag[cbyte].c[cbit] ;

#        skipflag = cskipflag[cbyte].c[cbit] ;

#

#    channel range is 1-199, range is 32 bytes (last 7 unknown)

#

MEM_FORMAT = MEM_FORMAT + """

#seekto 0x3240;

struct {

   bit c[8];

} csetflag[32];

#seekto 0x3260;

struct {

   bit c[8];

} cskipflag[32];

"""

#  RT98  memory map

#  section: 4  Startup Label

#

#  bytes:bit  type                 description

#  ---------------------------------------------------------------------------

#  6          char start_label[6]  label displayed at startup (usually

#                                  your call sign)

#

MEM_FORMAT = MEM_FORMAT + """

#seekto 0x3300;

struct {

    char startname[6];

} slabel;

"""

#  RT98  memory map

#  section: 5, 6 and 7  Radio Options

#        used to set a number of radio options

#

# description of function setup options, starting at 0x3310 (settings3)

#

#  bytes:bit  type                 description

#  ---------------------------------------------------------------------------

#  1          u8

#   :6        unknown:6

#   :2        bandlimit_3310:2     frequency ranges, range 0-2,

#                                  0=freenet(vhf) or pmr(uhf), 1=com, 2=comii

#                   rt98v - 00 FreeNet Rx(149 - 149.2 MHz) Tx(149 - 149.2 MHz)

#                           01 COM     Rx(136 - 174 MHz) Tx(136 - 174 MHz)

#                           02 COMII   Rx(147 - 174 MHz) Tx(147 - 174 MHz)

#                   rt98u - 00 PMR     Rx(446 - 446.2 MHz) Tx(446 - 446.2 MHz)

#                           01 COM     Rx(400 - 470 MHz) Tx(400 - 470 MHz)

#                           02 COMII   Rx(450 - 470 MHz) Tx(450 - 470 MHz)

#  1          u8 ch_number;        channel number, range 1-199

#  1          u8

#   :7        unknown_3312:7

#   :1        vfomr:1              vfo/mr mode, range 0-1, 0=mr, 1=vfo

#                                  only S/N:1907***********

#

# description of function setup options, starting at 0x3340 (settings)

#

#  bytes:bit  type                   description

#  ---------------------------------------------------------------------------

#  1          u8

#   :4        unknown_3340:4

#   :4        tuning_step:4          tuning step, menu index value from 0-8

#                                    2.5, 5, 6.25, 10, 12.5, 20, 25, 30, 50

#  1          u8

#   :7        unknown_3341:7

#   :1        beep:1                 beep mode, range 0-1, 0=off, 1=on

#  1           u8

#   :3        unknown_3342:3

#   :5        timeout_timer:5        timeout timer, range off (no timeout),

#                                    1-30 minutes

#  1          u8

#   :6        unknown_3343:6

#   :2        auto_power_off:2       auto power off, range 0-3, off, 30min,

#                                    1hr, 2hr

#  1          u8

#   :4        unknown_3344:4

#   :4        squelch:4              squelch level, range off, 1-9

#  1          u8

#   :3        unknown_3345:3

#   :5        volume:5               volume level, range 1-30 (no zero)

#  1          u8

#   :6        unknown_3346:6

#   :2        scan_revive:2          scan revive method, range 0-2, 0=to,

#                                    1=co, 2=se

#                                    only S/N:1907***********

#  1          u8 unknown_3347

#  1          u8   0x3348 [12]

#   :6        unknown_3348:6

#   :2        display_mode           display mode, range 0-2, 0=channel,

#                                    1=frequency, 2=name

#  1           u8

#   :7        unknown_3349:7

#   :1        auto_power_on:1        auto power on, range 0-1, 0=manual,

#                                    1=auto

#  1          u8

#   :3        unknown_334A:3

#   :5        mic_gain:5             mic gain, range 1-30 (no zero)

#  1          u8

#   :5        unknown_334C:5

#   :3        ste_type:3             ste type, range 0-4, 0=off, 1=silent,

#                                    2=120degree, 3=180degree, 4=240degree

#  1          u8

#   :7        unknown_334D:7

#   :1        ste_frequency:1        ste frequency, range 0-2, 0=off,

#                                    1=55.2Hz, 2=259.2Hz

#  1          u8

#   :2        unknown_0x334E:2

#   :1        forbid_setting:1       forbid setting(optional function),

#                                    range 0-1, 0=disabled, 1=enabled

#   :1        forbid_initialize:1    forbid initialize operate, range 0-1,

#                                    0=enabled, 1=disabled (inverted)

#   :1        save_chan_param:1      save channel parameters, range 0-1,

#                                    0=disabled, 1=enabled

#   :1        forbid_chan_menu:1     forbid channel menu, range 0-1,

#                                    0=disabled, 1=enabled

#   :1        sql_key_function:1     sql key function, range 0-1,

#                                    0=squelch off momentary, 1=squelch off

#   :1        unknown:1

#

# description of function setup options, starting at 0x3380 (settings2)

#

#  bytes:bit  type                   description

#  ---------------------------------------------------------------------------

#  1          u8

#   :7        unknown_3380:7

#   :1        scan_mode:1            scan mode, range 0-1, 0=off, 1=on

#  1          u8

#   :6        unknown_3381:6

#   :2        priority_ch:2          priority channel, range 0-3, 0=off,

#                                    1=priority channel 1,

#                                    2=priority channel 2,

#                                    3=priority channel 1 + priority channel 2

#  1          u8 priority_ch1        priority channel 1 number, range 1-199

#  1          u8 priority_ch2        priority channel 2 number, range 1-199

#  1          u8

#   :4        unknown_3384:4

#   :4        revert_ch:4            revert channel, range 0-3, 0=selected,

#                                    1=selected + talkback, 2=last called,

#                                    3=last used

#  1          u8 look_back_time_a    look back time a, range 0-45

#  1          u8 look_back_time_b    look back time b, range 0-45

#  1          u8 dropout_delay_time  dropout delay time, range 0-49

#  1          u8 dwell_time          dwell time, range 0-49

#

MEM_FORMAT = MEM_FORMAT + """

#seekto 0x3310;

struct {

    u8 bandlimit;

    u8 ch_number;

    u8 unknown_3312:7,

       vfomr:1;

} settings3;

"""

MEM_FORMAT = MEM_FORMAT + """

#seekto 0x3340;

struct {

  u8 unknown_3340:4,

     tuning_step:4;

  u8 unknown_3341:7,

     beep:1;

  u8 unknown_3342:3,

     timeout_timer:5;

  u8 unknown_3343:6,

     auto_power_off:2;

  u8 unknown_3344:4,

     squelch:4;

  u8 unknown_3345:3,

     volume:5;

  u8 unknown_3346:6,

     scan_resume:2;

  u8 unknown_3347;

  u8 unknown_3348:6,

     display_mode:2;

  u8 unknown_3349:7,

     auto_power_on:1;

  u8 unknown_334A:3,

     mic_gain:5;

  u8 unknown_334B;

  u8 unknown_334C:5,

     ste_type:3;

  u8 unknown_334D:6,

     ste_frequency:2;

  u8 unknown_334E:1,

     forbid_setting:1,

     unknown1:1,

     forbid_initialize:1,

     save_chan_param:1,

     forbid_chan_menu:1,

     sql_key_function:1,

     unknown2:1;

} settings;

"""

MEM_FORMAT = MEM_FORMAT + """

#seekto 0x3380;

struct {

  u8 unknown_3380:7,

     scan_mode:1;

  u8 unknown_3381:6,

     priority_ch:2;

  u8 priority_ch1;

  u8 priority_ch2;

  u8 unknown_3384:4,

     revert_ch:4;

  u8 look_back_time_a;

  u8 look_back_time_b;

  u8 dropout_delay_time;

  u8 dwell_time;

} settings2;

"""

#  RT98  memory map

#  section: 8  Embedded Messages

#

#  bytes:bit  type                 description

#  ---------------------------------------------------------------------------

#  6          char radio_type[5]   radio type, vhf=rt98v, uhf=rt98u

#  2          u8 unknown1[2]

#  4          char mcu_version[4]  mcu version, [x.xx]

#  2          u8 unknown2[2]

#  1          u8 mode              rt98u mode: 0=pmr, 1=com, 2=comii

#                                  rt98v mode: 0=freenet, 1=com, 2=comii

#  1          u8 unknown3

#  10         u8 unused1[10]

#  4          u8 unknown4[4]

#  3          u8 unused2[3]

#  16         u8 unknown5[16]

#  10         char date_mfg[16]    date manufactured, [yyyy-mm-dd]

#

MEM_FORMAT = MEM_FORMAT + """

#seekto 0x3D00;

struct {

char radio_type[7];

char mcu_version[4];

u8 unknown2[2];

u8 mode;

u8 unknown3;

u8 unused1[10];

u8 unknown4[4];

u8 unused2[3];

u8 unknown5[16];

char date_mfg[10];

} embedded_msg;

"""

# Format for the version messages returned by the radio

VER_FORMAT = '''

u8 hdr;

char model[7];

u8 bandlimit;

char version[6];

u8 ack;

'''

# Radio supports upper case and symbols

CHARSET_ASCII_PLUS = chirp_common.CHARSET_UPPER_NUMERIC + '- '

# Band limits as defined by the band byte in ver_response, defined in Hz, for

# VHF and UHF, used for RX and TX.

RT98V_BAND_LIMITS = {0x00: [(149000000, 149200000)],

                     0x01: [(136000000, 174000000)],

                     0x02: [(147000000, 174000000)]}

RT98U_BAND_LIMITS = {0x00: [(446000000, 446200000)],

                     0x01: [(400000000, 470000000)],

                     0x02: [(450000000, 470000000)]}

# Get band limits from a band limit value

def get_band_limits_Hz(radio_type, limit_value):

    if str(radio_type) == "RT98U" or "AT-779U":

        if limit_value not in RT98U_BAND_LIMITS:

            limit_value = 0x01

            LOG.warning('Unknown band limit value 0x%02x, default to 0x01')

        bandlimitfrequencies = RT98U_BAND_LIMITS[limit_value]

    elif str(radio_type) == "RT98V" or "AT-779V":

        if limit_value not in RT98V_BAND_LIMITS:

            limit_value = 0x01

            LOG.warning('Unknown band limit value 0x%02x, default to 0x01')

        bandlimitfrequencies = RT98V_BAND_LIMITS[limit_value]

    else:

        LOG.error('Unknown band limit value 0x%02x')

        raise errors.RadioError("Unknown band limit value")

    return bandlimitfrequencies

def _echo_write(radio, data):

    try:

        radio.pipe.write(data)

        radio.pipe.read(len(data))

    except Exception, e:

        LOG.error("Error writing to radio: %s" % e)

        raise errors.RadioError("Unable to write to radio")

def _checksum(data):

    cs = 0

    for byte in data:

        cs += ord(byte)

    return cs % 256

def _read(radio, length):

    try:

        data = radio.pipe.read(length)

    except Exception, e:

        _finish(radio)

        LOG.error("Error reading from radio: %s" % e)

        raise errors.RadioError("Unable to read from radio")

    if len(data) != length:

        _finish(radio)

        LOG.error("Short read from radio (%i, expected %i)" %

                  (len(data), length))

        LOG.debug(util.hexprint(data))

        raise errors.RadioError("Short read from radio")

    return data

# strip trailing 0x00 to convert a string returned by bitwise.parse into a

# python string

def cstring_to_py_string(cstring):

    return "".join(c for c in cstring if c != '\x00')

# Check the radio version reported to see if it's one we support,

# returns bool version supported, and the band index

def check_ver(ver_response, allowed_types):

    ''' Check the returned radio version is one we approve of '''

    LOG.debug('ver_response = ')

    LOG.debug(util.hexprint(ver_response))

    resp = bitwise.parse(VER_FORMAT, ver_response)

    verok = False

    if resp.hdr == 0x49 and resp.ack == 0x06:

        model, version = [cstring_to_py_string(bitwise.get_string(s)).strip()

                          for s in (resp.model, resp.version)]

        LOG.debug('radio model: \'%s\' version: \'%s\'' %

                  (model, version))

        LOG.debug('allowed_types = %s' % allowed_types)

        if model in allowed_types:

            LOG.debug('model in allowed_types')

            if version in allowed_types[model]:

                LOG.debug('version in allowed_types[model]')

                verok = True

    else:

        _finish(radio)

        raise errors.RadioError('Failed to parse version response')

    return verok, str(resp.model), int(resp.bandlimit)

def _ident(radio):

    radio.pipe.timeout = 1

    _echo_write(radio, "PROGRAM")

    response = radio.pipe.read(3)

    if response != "QX\06":

        _finish(radio)

        LOG.debug("Response was :\n%s" % util.hexprint(response))

        raise errors.RadioError("Radio did not respond. Check connection.")

    _echo_write(radio, "\x02")

    ver_response = radio.pipe.read(16)

    LOG.debug(util.hexprint(ver_response))

    verok, model, bandlimit = check_ver(ver_response,

                                        radio.ALLOWED_RADIO_TYPES)

    if not verok:

        _finish(radio)

        raise errors.RadioError(

            'Radio version not in allowed list for %s-%s: %s' %

            (radio.VENDOR, radio.MODEL, util.hexprint(ver_response)))

    return model, bandlimit

def _send(radio, cmd, addr, length, data=None):

    frame = struct.pack(">cHb", cmd, addr, length)

    if data:

        frame += data

        frame += chr(_checksum(frame[1:]))

        frame += "\x06"

    _echo_write(radio, frame)

    LOG.debug("Sent:\n%s" % util.hexprint(frame))

    if data:

        result = radio.pipe.read(1)

        if result != "\x06":

            _finish(radio)

            LOG.debug("Ack was: %s" % repr(result))

            raise errors.RadioError("Radio did not accept block at %04x"

                                    % addr)

        return

    result = _read(radio, length + 6)

    LOG.debug("Got:\n%s" % util.hexprint(result))

    header = result[0:4]

    data = result[4:-2]

    ack = result[-1]

    if ack != "\x06":

        _finish(radio)

        LOG.debug("Ack was: %s" % repr(ack))

        raise errors.RadioError("Radio NAK'd block at %04x" % addr)

    _cmd, _addr, _length = struct.unpack(">cHb", header)

    if _addr != addr or _length != _length:

        _finish(radio)

        LOG.debug("Expected/Received:")

        LOG.debug(" Length: %02x/%02x" % (length, _length))

        LOG.debug(" Addr: %04x/%04x" % (addr, _addr))

        raise errors.RadioError("Radio send unexpected block")

    cs = _checksum(result[1:-2])

    if cs != ord(result[-2]):

        _finish(radio)

        LOG.debug("Calculated: %02x" % cs)

        LOG.debug("Actual:     %02x" % ord(result[-2]))

        raise errors.RadioError("Block at 0x%04x failed checksum" % addr)

    return data

def _finish(radio):

    endframe = "\x45\x4E\x44"

    _echo_write(radio, endframe)

    result = radio.pipe.read(1)

    if result != "\x06":

        LOG.error("Got:\n%s" % util.hexprint(result))

        raise errors.RadioError("Radio did not finish cleanly")

def do_download(radio):

    _ident(radio)

    _memobj = None

    data = ""

    for addr in range(0, radio._memsize, 0x10):

        block = _send(radio, 'R', addr, 0x10)

        data += block

        status = chirp_common.Status()

        status.cur = len(data)

        status.max = radio._memsize

        status.msg = "Downloading from radio"

        radio.status_fn(status)

    _finish(radio)

    return memmap.MemoryMap(data)

def do_upload(radio):

    model, bandlimit = _ident(radio)

    _embedded = radio._memobj.embedded_msg

    if model != str(_embedded.radio_type):

        LOG.warning('radio and image model types differ')

        LOG.warning('model type (radio): %s' % str(model))

        LOG.warning('model type (image): %s' % str(_embedded.radio_type))

        _finish(radio)

        msg = ("The upload was stopped because the radio type "

               "of the image (%s) does not match that "

               "of the radio (%s).")

        raise errors.RadioError(msg % (str(_embedded.radio_type), str(model)))

    if bandlimit != int(_embedded.mode):

        if str(_embedded.radio_type) == "RT98U" or "AT-779U":

            image_band_limits = LIST_RT98U_FREQS[int(_embedded.mode)]

        if str(_embedded.radio_type) == "RT98V" or "AT-779V":

            image_band_limits = LIST_RT98V_FREQS[int(_embedded.mode)]

        if model == "RT98U" or "AT-779U":

            radio_band_limits = LIST_RT98U_FREQS[int(bandlimit)]

        if model == "RT98V" or "AT-779V":

            radio_band_limits = LIST_RT98V_FREQS[int(bandlimit)]

        LOG.warning('radio and image band limits differ')

        LOG.warning('image band limits: %s' % image_band_limits)

        LOG.warning('radio band limits: %s' % radio_band_limits)

        _finish(radio)

        msg = ("The upload was stopped because the band limits "

               "of the image (%s) does not match that "

               "of the radio (%s).")

        raise errors.RadioError(msg % (image_band_limits, radio_band_limits))

    try:

        for start, end in radio._ranges:

            for addr in range(start, end, 0x10):

                block = radio._mmap[addr:addr+0x10]

                _send(radio, 'W', addr, len(block), block)

                status = chirp_common.Status()

                status.cur = addr

                status.max = end

                status.msg = "Uploading to Radio"

                radio.status_fn(status)

        _finish(radio)

    except errors.RadioError:

        raise

    except Exception as e:

        _finish(radio)

        raise errors.RadioError('Failed to upload to radio: %s' % e)

#

# The base class, extended for use with other models

#

class Rt98BaseRadio(chirp_common.CloneModeRadio,

                    chirp_common.ExperimentalRadio):

    """Retevis RT98 Base"""

    VENDOR = "Retevis"

    MODEL = "RT98 Base"

    BAUD_RATE = 9600

    _memsize = 0x3E00

    _ranges = [(0x0000, 0x3310),

               (0x3320, 0x3390)]

    @classmethod

    def get_prompts(cls):

        rp = chirp_common.RadioPrompts()

        rp.experimental = ("The Retevis RT98 driver is an beta version."

                           "Proceed with Caution and backup your data")

        return rp

    def get_features(self):

        class FakeEmbedded(object):

            mode = 0

            radio_type = 'RT98U'

        if self._memobj:

            _embedded = self._memobj.embedded_msg

        else:

            # If we have no memory object, take defaults for unit

            # test, make_supported, etc

            _embedded = FakeEmbedded()

        rf = chirp_common.RadioFeatures()

        rf.has_settings = True

        rf.has_bank = False

        rf.can_odd_split = True

        rf.has_name = True

        if _embedded.mode == 0:  # PMR or FreeNet

            rf.has_offset = False

        else:

            rf.has_offset = True

        rf.has_ctone = True

        rf.has_cross = True

        rf.has_tuning_step = False

        rf.has_dtcs = True

        rf.has_rx_dtcs = True

        rf.has_dtcs_polarity = True

        rf.valid_skips = ["", "S"]

        rf.memory_bounds = (1, 199)

        rf.valid_name_length = 6

        if _embedded.mode == 0:  # PMR or FreeNet

            rf.valid_duplexes = ['']

        else:

            rf.valid_duplexes = DUPLEXES + ['split', 'off']

        rf.valid_characters = chirp_common.CHARSET_UPPER_NUMERIC + "- "

        if _embedded.mode == 0:  # PMR or FreeNet

            rf.valid_modes = ['NFM']

        else:

            rf.valid_modes = ['FM', 'NFM']

        rf.valid_tmodes = ['', 'Tone', 'TSQL', 'DTCS', 'Cross']

        rf.valid_cross_modes = CROSS_MODES

        if _embedded.mode == 0:  # PMR or FreeNet

            if str(_embedded.radio_type) == "RT98U":

                rf.valid_power_levels = PMR_POWER_LEVELS

            if str(_embedded.radio_type) == "RT98V":

                rf.valid_power_levels = FREENET_POWER_LEVELS

        else:

            rf.valid_power_levels = POWER_LEVELS

        rf.valid_dtcs_codes = chirp_common.ALL_DTCS_CODES

        try:

            rf.valid_bands = get_band_limits_Hz(

                str(_embedded.radio_type),

                int(_embedded.mode))

        except TypeError as e:

            # If we're asked without memory loaded, assume the most permissive

            rf.valid_bands = get_band_limits_Hz(str(_embedded.radio_type), 1)

        except Exception as e:

            LOG.error('Failed to get band limits for RT98: %s' % e)

            rf.valid_bands = get_band_limits_Hz(str(_embedded.radio_type), 1)

        rf.valid_tuning_steps = TUNING_STEPS

        return rf

    def validate_memory(self, mem):

        _embedded = self._memobj.embedded_msg

        msgs = ""

        msgs = chirp_common.CloneModeRadio.validate_memory(self, mem)

        # FreeNet and PMR radio types

        if _embedded.mode == 0:  # PMR or FreeNet

            freq = float(mem.freq) / 1000000

            # FreeNet

            if str(_embedded.radio_type) == "RT98V":

                if freq not in FREENET_FREQS:

                    _msg_freq = 'Memory location not a valid FreeNet frequency'

                    # warn user invalid frequency

                    msgs.append(chirp_common.ValidationError(_msg_freq))

            # PMR

            if str(_embedded.radio_type) == "RT98U":

                if freq not in PMR_FREQS:

                    _msg_freq = 'Memory location not a valid PMR frequency'

                    # warn user invalid frequency

                    msgs.append(chirp_common.ValidationError(_msg_freq))

        return msgs

    # Do a download of the radio from the serial port

    def sync_in(self):

        self._mmap = do_download(self)

        self.process_mmap()

    # Do an upload of the radio to the serial port

    def sync_out(self):

        do_upload(self)

    def process_mmap(self):

        self._memobj = bitwise.parse(MEM_FORMAT, self._mmap)

    # Return a raw representation of the memory object, which

    # is very helpful for development

    def get_raw_memory(self, number):

        return repr(self._memobj.memory[number - 1])

    def _get_dcs_index(self, _mem, which):

        base = getattr(_mem, '%scode' % which)

        extra = getattr(_mem, '%sdcsextra' % which)

        return (int(extra) << 8) | int(base)

    def _set_dcs_index(self, _mem, which, index):

        base = getattr(_mem, '%scode' % which)

        extra = getattr(_mem, '%sdcsextra' % which)

        base.set_value(index & 0xFF)

        extra.set_value(index >> 8)

    # Extract a high-level memory object from the low-level memory map

    # This is called to populate a memory in the UI

    def get_memory(self, number):

        _embedded = self._memobj.embedded_msg

        # Get a low-level memory object mapped to the image

        _mem = self._memobj.memory[number - 1]

        # get flag info

        cbyte = (number - 1) / 8

        cbit = 7 - ((number - 1) % 8)

        setflag = self._memobj.csetflag[cbyte].c[cbit]

        skipflag = self._memobj.cskipflag[cbyte].c[cbit]

        mem = chirp_common.Memory()

        mem.number = number  # Set the memory number

        # We'll consider any blank (i.e. 0MHz frequency) to be empty

        if _mem.freq == 0:

            mem.empty = True

            return mem

        if setflag == 0:

            mem.empty = True

            return mem

        if _mem.get_raw()[0] == "\xFF":

            mem.empty = True

            return mem

        # set the name

        mem.name = str(_mem.name).rstrip()  # Set the alpha tag

        # Convert your low-level frequency and offset to Hertz

        mem.freq = int(_mem.freq) * 10

        mem.offset = int(_mem.offset) * 10

        # Set the duplex flags

        if _mem.duplex == DUPLEX_POSSPLIT:

            mem.duplex = '+'