CHIRP

# MRT Beta 1.5 - Corrected minor typos found in previous versions

#              - Made pri_ch,work_ch_a,work_ch_b U16 instead of U8 to fix errors when specifying channel values > 255

#              - Changed node_sw_pwd to mode_sw_pwd

#              - Added Compander to VFOA and VFOB settings

#              - Added Scan Group Upper/Lower to Scan Settings

#                    - changed group_x_lower and upper to group_lowerx to support for loop use

#              - Added Call Names to the Call Settings

#              - Added Mode SW Pwd and Reset Pwd to Config Settings

#              - Display FM Radio Presets in proper format / units (MHz)

#              - Display VFOA/VFOB/Rx Freq and RX Freq limits in units of MHz

#                   VHF freq Limit range is 30 - 299.999999 MHz

#                   UHF freq Limit range is 300 - 999.999999 MHz 

#                   VFOA/VFOB Freq Range is 30 - 999.999999 MHz

# 

#              - SETTINGS NOT YET IMPLEMENTED

#                   VFOA/VFOB RxTone and TxTone

#              - Note:  For channels shown on Memories tab 

#                   Compander, Descramble and SP Mute are not currently modifiable through the Memories tab.

#                   If any changes are made to a channel's settings, they are always defaulted to Off, Off, QT respectively. 

#                   

# MRT Beta 1.4 - updated User Interface to support settings modifications through the settings tab

# melvin.terechenok@gmail.com

# MRT 935G BETA1.3 - Update to handle 935G

# MRT Mapped most Wouxon CPS settings in Chirp

# MRT Upload to Radio and Download from Radio are working

# MRT Settings are available under the Browser tab in Hex/Dec/Bin format

# MRT No limits or error checking is done on values entered

# MRT Incorrect/Invalid values may cause radio malfunctions

# Copyright 2019 Pavel Milanes CO7WT <pavelmc@gmail.com>

#

# Based on the work of Krystian Struzik <toner_82@tlen.pl>

# who figured out the crypt used and made possible the

# Wuoxun KG-UV8D Plus driver, in which this work is based.

#

# 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 3 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/>.

"""Wouxun KG-935G radio management module"""

import time

import os

import logging

from chirp import util, chirp_common, bitwise, memmap, errors, directory

from chirp.settings import RadioSetting, RadioSettingGroup, \

    RadioSettingValueBoolean, RadioSettingValueList, \

    RadioSettingValueInteger, RadioSettingValueString, \

    RadioSettingValueFloat, RadioSettings

LOG = logging.getLogger(__name__)

CMD_ID = 128    # \x80

CMD_END = 129   # \x81

CMD_RD = 130    # \82

CMD_WR = 131    # \83

MEM_VALID = 158

AB_LIST = ["A", "B"]

STEPS = [2.5, 5.0, 6.25, 10.0, 12.5, 25.0, 50.0, 100.0]

STEP_LIST = [str(x) for x in STEPS]

ROGER_LIST = ["Off", "Begin", "End", "Both"]

TIMEOUT_LIST = ["Off"] + [str(x) + "s" for x in range(15, 901, 15)]

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

BANDWIDTH_LIST = ["Narrow", "Wide"]

VOICE_LIST = ["Off", "On"]

LANGUAGE_LIST = ["Chinese", "English"]

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

#MRT - EDIT FOR 935G

PFKEYLONG_LIST = ["undef", "FRQ2-PTT", "Selec Call", "Scan", "Flashlight", "Alarm", "SOS", "FM Radio", "Moni", "Strobe", "Weather", "Tlk A", "Reverse", "CTC Scan", "DCS Scan", "BRT"]

PFKEYSHORT_LIST = ["undef", "Scan", "Flashlight", "Alarm", "SOS", "FM Radio", "Moni", "Strobe", "Weather", "Tlk A", "Reverse", "CTC Scan", "DCS Scan", "BRT"]

#

WORKMODE_LIST = ["VFO", "Ch.Number.", "Ch.Freq.", "Ch.Name"]

BACKLIGHT_LIST = ["Always On"] + [str(x) + "s" for x in range(1, 21)] + \

    ["Always Off"]

OFFSET_LIST = ["+", "-"]

PONMSG_LIST = ["MSG - Bitmap", "Battery Volts"]

SPMUTE_LIST = ["QT", "QT+DTMF", "QT*DTMF"]

DTMFST_LIST = ["OFF", "DTMF", "ANI", "DTMF+ANI"]

DTMF_TIMES = [str(x) + "ms" for x in range(0, 501, 10)]

RPTSET_LIST = ["", "X-DIRRPT", "X-TWRPT"] # TODO < what is index 0?

ALERTS = [1750, 2100, 1000, 1450]

ALERTS_LIST = [str(x) for x in ALERTS]

PTTID_LIST = ["BOT", "EOT", "Both"]

LIST_10 = ["Off"] + ["%s" % x for x in range(1, 11)]

SCANGRP_LIST = ["All"] + ["%s" % x for x in range(1, 11)]

SCQT_LIST = ["Decoder", "Encoder", "All"]

SMUTESET_LIST = ["Off", "Tx", "Rx", "Tx+Rx"]

POWER_LIST = ["Lo", "Mid", "Hi"]

HOLD_TIMES = ["Off"] + ["%s" % x for x in range(100, 5001, 100)]

RPTMODE_LIST = ["Radio", "Repeater"]

#MRT ADDED NEW LISTS

THEME_LIST = ["White-1", "White-2", "Black-1", "Black-2"]

DSPBRTSBY_LIST = ["OFF", "1", "2", "3", "4", "5", "6", "7", "8", "9", "10"]

DSPBRTACT_LIST = ["OFF-DO NOT USE", "1", "2", "3", "4", "5", "6", "7", "8", "9", "10"]

TONESCANSAVELIST= ["Rx", "Tx", "Tx/Rx"]

PTTDELAY_LIST = [str(x) + "ms" for x in range(0, 3001, 100)]

SCRAMBLE_LIST = ["OFF"] + [str(x) for x in range(1,9)]

ONOFF_LIST = ["OFF", "ON"]

# memory slot 0 is not used, start at 1 (so need 1000 slots, not 999)

# structure elements whose name starts with x are currently unidentified

# MRT made Power = 2 bits to handle 935G's 3 power levels

# MRT beta 1.3 - updates to structure to match KG935G Custom programming SW configuration settings, FM Radio presets, Key Settings

# MRT beta 1.4 - modified some value names and merged FM Radio memories with other settings to resolve errors in UI implementation

_MEM_FORMAT = """

    #seekto 0x0044;

    struct {

        u32    rx_start;

        u32    rx_stop;

        u32    tx_start;

        u32    tx_stop;

    } uhf_limits;

    #seekto 0x0054;

    struct {

        u32    rx_start;

        u32    rx_stop;

        u32    tx_start;

        u32    tx_stop;

    } vhf_limits;

    #seekto 0x0400;

    struct {

        char     oem1[8];

        char     unknown[2];

        u8     unknown2[10];

        u8     unknown3[10];

        u8     unknown4[8];

        char     oem2[10];

        u8     version[6];

        char     date[8];

        u8     unknown5[2];

        char     model[8];     

    } oem_info;

    #seekto 0x0480;

    struct {

        u16    Group_lower1;

        u16    Group_upper1;

        u16    Group_lower2;

        u16    Group_upper2;

        u16    Group_lower3;

        u16    Group_upper3;

        u16    Group_lower4;

        u16    Group_upper4;

        u16    Group_lower5;

        u16    Group_upper5;

        u16    Group_lower6;

        u16    Group_upper6;

        u16    Group_lower7;

        u16    Group_upper7;

        u16    Group_lower8;

        u16    Group_upper8;

        u16    Group_lower9;

        u16    Group_upper9;

        u16    Group_lower10;

        u16    Group_upper10;

    } scan_groups;

    #seekto 0x0500;

    struct {

        u8    call_code_1[6];

        u8    call_code_2[6];

        u8    call_code_3[6];

        u8    call_code_4[6];

        u8    call_code_5[6];

        u8    call_code_6[6];

        u8    call_code_7[6];

        u8    call_code_8[6];

        u8    call_code_9[6];

        u8    call_code_10[6];

        u8    call_code_11[6];

        u8    call_code_12[6];

        u8    call_code_13[6];

        u8    call_code_14[6];

        u8    call_code_15[6];

        u8    call_code_16[6];

        u8    call_code_17[6];

        u8    call_code_18[6];

        u8    call_code_19[6];

        u8    call_code_20[6];

    } call_groups;

    #seekto 0x0580;

    struct {

        char    call_name1[6];

        char    call_name2[6];

        char    call_name3[6];

        char    call_name4[6];

        char    call_name5[6];

        char    call_name6[6];

        char    call_name7[6];

        char    call_name8[6];

        char    call_name9[6];

        char    call_name10[6];

        char    call_name11[6];

        char    call_name12[6];

        char    call_name13[6];

        char    call_name14[6];

        char    call_name15[6];

        char    call_name16[6];

        char    call_name17[6];

        char    call_name18[6];

        char    call_name19[6];

        char    call_name20[6];

    } call_names;

    #seekto 0x0600;

    struct {

        u16    FM_radio1;

        u16    FM_radio2;

        u16    FM_radio3;

        u16    FM_radio4;

        u16    FM_radio5;

        u16    FM_radio6;

        u16    FM_radio7;

        u16    FM_radio8;

        u16    FM_radio9;

        u16    FM_radio10;

        u16    FM_radio11;

        u16    FM_radio12;

        u16    FM_radio13;

        u16    FM_radio14;

        u16    FM_radio15;

        u16    FM_radio16;

        u16    FM_radio17;

        u16    FM_radio18;

        u16    FM_radio19;

        u16    FM_radio20;

        u16 unknown_pad_x0640[235];

        u8 unknown07fe;

        u8 unknown07ff;

        u8      ponmsg;

        char    dispstr[15];

        u8 unknown0810;

        u8 unknown0811;

        u8 unknown0812;

        u8 unknown0813;

        u8 unknown0814;

        u8      voice;

        u8      timeout;

        u8      toalarm;

        u8      channel_menu;

        u8      power_save;

        u8      autolock;

        u8      keylock;

        u8      beep;

        u8      stopwatch;

        u8      vox;

        u8      scan_rev;

        u8      backlight;

        u8      roger_beep;

        char      mode_sw_pwd[6];

        char      reset_pwd[6];

        u16     pri_ch;

        u8      ani_sw;

        u8      ptt_delay;

        u8      ani_code[6];

        u8      dtmf_st;

        u8      BCL_A;

        u8      BCL_B;

        u8      ptt_id;

        u8      prich_sw;

        u8 unknown083d;

        u8 unknown083e;

        u8 unknown083f;

        u8      alert;

        u8      pf1_shrt;

        u8      pf1_long;

        u8      pf2_shrt;

        u8      pf2_long;

        u8 unknown0845;

        u8      work_mode_a;

        u8      work_mode_b;

        u8      dtmf_tx_time;

        u8      dtmf_interval;

        u8      main_band;

        u16      work_ch_a;

        u16      work_ch_b;

        u8 unknown084f;

        u8 unknown0850;

        u8 unknown0851;

        u8 unknown0852;

        u8 unknown0853;

        u8 unknown0854;

        u8 unknown0855;

        u8 unknown0856;

        u8 unknown0857;

        u8 unknown0858;

        u8 unknown0859;

        u8 unknown085a;

        u8 unknown085b;

        u8 unknown085c;

        u8 unknown085d;

        u8 unknown085e;

        u8 unknown085f;

        u8 unknown0860;

        u8      TDR_single_mode;

        u8      ring_time;

        u8      ScnGrpA_Act;

        u8      ScnGrpB_Act;

        u8 unknown0865;

        u8      rpt_tone;

        u8 unknown0867;

        u8      scan_det;

        u8      ToneScnSave;

        u8 unknown086a;

        u8      smuteset;

        u8 unknown086c;

        u8      DspBrtAct;

        u8      DspBrtSby;

        u8 unknown086f;

        u8      theme;

        u8      wxalert;

        u8      VFO_repeater_a;

        u8      VFO_repeater_b;

        u8 unknown0874;

        u8 unknown0875;

        u8 unknown0876;

        u8 unknown0877;

        u8 unknown0878;

        u8 unknown0879;

        u8 unknown087a;

        u8 unknown087b;

        u8 unknown087c;

        u8 unknown087d;

        u8 unknown087e;

        u8 unknown087f;

    } settings;

    #seekto 0x0880;

    struct {

        u32     rxfreq;

        u32     unknown0;

        u16     rxtone;

        u16     txtone;

        u8      scrambler:4,

                unknown1:2,

                power:2; 

        u8      unknown3:1,

                unknown5:2

                unknown4:1,

                cmpndr:1,

                mute_mode:2,

                iswide:1;

        u8      step;

        u8      squelch;

      } vfoa;

    #seekto 0x08c0;

    struct {

        u32     rxfreq;

        u32     unknown0;

        u16     rxtone;

        u16     txtone;

        u8      scrambler:4,

                unknown1:2,

                power:2; 

        u8      unknown3:1,

                unknown5:2

                unknown4:1,

                cmpndr:1,

                mute_mode:2,

                iswide:1;

        u8      step;

        u8      squelch;

    } vfob;

    #seekto 0x0900;

    struct {

        u32     rxfreq;

        u32     txfreq;

        u16     rxtone;

        u16     txtone;

        u8      scrambler:4,

                unknown1:2,

                power:2; 

        u8      unknown3:2,

                scan_add:1,

                unknown4:1,

                compander:1,

                mute_mode:2,

                iswide:1;

        u8      unknown5;

        u8      unknown6;

    } memory[1000];

    #seekto 0x4780;

    struct {

        u8    name[8];

                u8    unknown[4];

    } names[1000];

    #seekto 0x7670;

    u8          valid[1000];

    """

    # Support for the Wouxun KG-935G radio

    # Serial coms are at 19200 baud

    # The data is passed in variable length records

    # Record structure:

    #  Offset   Usage

    #    0      start of record (\x7c)

    #    1      Command (\x80 Identify \x81 End/Reboot \x82 Read \x83 Write)

    #    2      direction (\xff PC-> Radio, \x00 Radio -> PC)

    #    3      length of payload (excluding header/checksum) (n)

    #    4      payload (n bytes)

    #    4+n+1  checksum - byte sum (% 256) of bytes 1 -> 4+n

    #

    # Memory Read Records:

    # the payload is 3 bytes, first 2 are offset (big endian),

    # 3rd is number of bytes to read

    # Memory Write Records:

    # the maximum payload size (from the Wouxun software) seems to be 66 bytes

    #  (2 bytes location + 64 bytes data).

#MRT 1.2 correct spelling of Wouxon

class KGUV8TRadio(chirp_common.Alias):

    VENDOR = "Wouxun"

    MODEL = "KG-935G"

@directory.register

class KG935GRadio(chirp_common.CloneModeRadio,

                  chirp_common.ExperimentalRadio):

    """Wouxun KG-935G"""

    VENDOR = "Wouxun"

    MODEL = "KG-935G"

    _model = "KG-UV8D-B"

    _file_ident = "935G"

    BAUD_RATE = 19200

# MRT - Added Medium Power level for 935G support

    POWER_LEVELS = [chirp_common.PowerLevel("L", watts=0.5),

                    chirp_common.PowerLevel("M", watts=4.5),

                    chirp_common.PowerLevel("H", watts=5.5)]

    _mmap = ""

    ALIASES = [KGUV8TRadio,]

    def _checksum(self, data):

        cs = 0

        for byte in data:

            cs += ord(byte)

        return chr(cs % 256)

    def _write_record(self, cmd, payload = None):

        # build the packet

        _header = '\x7c' + chr(cmd) + '\xff'

        _length = 0

        if payload:

            _length = len(payload)

        # update the length field

        _header += chr(_length)

        if payload:

            # calculate checksum then add it with the payload to the packet and encrypt

            crc = self._checksum(_header[1:] + payload)

            payload += crc

            _header += self.encrypt(payload)

        else:

            # calculate and add encrypted checksum to the packet

            crc = self._checksum(_header[1:])

            _header += self.strxor(crc, '\x57')

        try:

            self.pipe.write(_header)

        except Exception, e:

            raise errors.RadioError("Failed to communicate with radio: %s" % e)

    def _read_record(self):

        # read 4 chars for the header

        _header = self.pipe.read(4)

        if len(_header) != 4:

            raise errors.RadioError('Radio did not respond')

        _length = ord(_header[3])

        _packet = self.pipe.read(_length)

        _rcs_xor = _packet[-1]

        _packet = self.decrypt(_packet)

        _cs = ord(self._checksum(_header[1:] + _packet))

        # read the checksum and decrypt it

        _rcs = ord(self.strxor(self.pipe.read(1), _rcs_xor))

        return (_rcs != _cs, _packet)

    def decrypt(self, data):

        result = ''

        for i in range(len(data)-1, 0, -1):

            result += self.strxor(data[i], data[i - 1])

        result += self.strxor(data[0], '\x57')

        return result[::-1]

    def encrypt(self, data):

        result = self.strxor('\x57', data[0])

        for i in range(1, len(data), 1):

            result += self.strxor(result[i - 1], data[i])

        return result

    def strxor (self, xora, xorb):

        return chr(ord(xora) ^ ord(xorb))

    # Identify the radio

    #

    # A Gotcha: the first identify packet returns a bad checksum, subsequent

    # attempts return the correct checksum... (well it does on my radio!)

    #

    # The ID record returned by the radio also includes the current frequency range

    # as 4 bytes big-endian in 10Hz increments

    #

    # Offset

    #  0:10     Model, zero padded (Looks for 'KG-UV8D-B')

    @classmethod

    def match_model(cls, filedata, filename):

        id = cls._file_ident 

        return cls._file_ident in filedata[0x426:0x430]

    def _identify(self):

        """Do the identification dance"""

        for _i in range(0, 10):

            self._write_record(CMD_ID)

            _chksum_err, _resp = self._read_record()

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

            if _chksum_err:

                LOG.error("Checksum error: retrying ident...")

                time.sleep(0.100)

                continue

            LOG.debug("Model %s" % util.hexprint(_resp[0:9]))

            if _resp[0:9] == self._model:

                return

            if len(_resp) == 0:

                raise Exception("Radio not responding")

            else:

                raise Exception("Unable to identify radio")

    def _finish(self):

        self._write_record(CMD_END)

    def process_mmap(self):

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

    def sync_in(self):

        try:

            self._mmap = self._download()

        except errors.RadioError:

            raise

        except Exception, e:

            raise errors.RadioError("Failed to communicate with radio: %s" % e)

        self.process_mmap()

    def sync_out(self):

        self._upload()

    # TODO: Load all memory.

    # It would be smarter to only load the active areas and none of

    # the padding/unused areas. Padding still need to be investigated.

    def _download(self):

        """Talk to a wouxun KG-935G and do a download"""

        try:

            self._identify()

            return self._do_download(0, 32768, 64)

        except errors.RadioError:

            raise

        except Exception, e:

            LOG.exception('Unknown error during download process')

            raise errors.RadioError("Failed to communicate with radio: %s" % e)

    def _do_download(self, start, end, blocksize):

        # allocate & fill memory

        image = ""

        for i in range(start, end, blocksize):

            req = chr(i / 256) + chr(i % 256) + chr(blocksize)

            self._write_record(CMD_RD, req)

            cs_error, resp = self._read_record()

            if cs_error:

                LOG.debug(util.hexprint(resp))

                raise Exception("Checksum error on read")

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

            image += resp[2:]

            if self.status_fn:

                status = chirp_common.Status()

                status.cur = i

                status.max = end

                status.msg = "Cloning from radio"

                self.status_fn(status)

        self._finish()

        return memmap.MemoryMap(''.join(image))

    def _upload(self):

        """Talk to a wouxun KG-935G and do a upload"""

        try:

            self._identify()

            self._do_upload(0, 32768, 64)

        except errors.RadioError:

            raise

        except Exception, e:

            raise errors.RadioError("Failed to communicate with radio: %s" % e)

        return

    def _do_upload(self, start, end, blocksize):

        ptr = start

        for i in range(start, end, blocksize):

            req = chr(i / 256) + chr(i % 256)

            chunk = self.get_mmap()[ptr:ptr + blocksize]

            self._write_record(CMD_WR, req + chunk)

            LOG.debug(util.hexprint(req + chunk))

            cserr, ack = self._read_record()

            LOG.debug(util.hexprint(ack))

            j = ord(ack[0]) * 256 + ord(ack[1])

            if cserr or j != ptr:

                raise Exception("Radio did not ack block %i" % ptr)

            ptr += blocksize

            if self.status_fn:

                status = chirp_common.Status()

                status.cur = i

                status.max = end

                status.msg = "Cloning to radio"

                self.status_fn(status)

        self._finish()

    def get_features(self):

        rf = chirp_common.RadioFeatures()

        rf.has_settings = True

        rf.has_ctone = True

        rf.has_rx_dtcs = True

        rf.has_cross = True

        rf.has_tuning_step = False

        rf.has_bank = False

        rf.can_odd_split = True

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

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

        rf.valid_cross_modes = [

            "Tone->Tone",

            "Tone->DTCS",

            "DTCS->Tone",

            "DTCS->",

            "->Tone",

            "->DTCS",

            "DTCS->DTCS",

        ]

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

        rf.valid_power_levels = self.POWER_LEVELS

        rf.valid_name_length = 8

        rf.valid_duplexes = ["", "-", "+", "split", "off"]

        rf.valid_bands = [(137000000, 175000000),  # supports 2m

                          (400000000, 480000000)]  # supports 70cm

        rf.valid_characters = chirp_common.CHARSET_ASCII

        rf.memory_bounds = (1, 999)  # 999 memories

        rf.valid_tuning_steps = STEPS

        return rf

    @classmethod

    def get_prompts(cls):

        rp = chirp_common.RadioPrompts()

        rp.experimental = \

            ('This driver is experimental.\n'

             '\n'

             'Please keep a copy of your memories with the original Wouxon CPS software '

             'if you treasure them, this driver is new and may contain bugs.\n'

             '\n'

             ' Upload and Download from/to the Radio are working\n'

             ' '

             ' User interface has been added. \n Most of the settings from the Wouxon Custom Programming'

             ' software have been mapped\n in addition to some bonus settings that were'

             ' found.\n'

             ' Changing the VHF/UHF Rx limits does appear to work - but radio performance\n'

             ' is not guaranteed-  and may void warranty or cause radio to malfunction.\n'

             ' You can also customize the bottom banner from the OEMINFO Model setting\n'

                          ' \n'

             ' There are no limits/error checking done on the settings when using the Browser tab.\n'

             ' \n'

             ' Incorrect/Illegal values for a setting may cause radio malfunctions\n'

             ' USE AT YOUR OWN RISK\n'

             '\n'

             )

        return rp

    def get_raw_memory(self, number):

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

# MRT - corrected the Polarity decoding to match 935G implementation use 0x2000 bit mask for R

# MRT - 0x2000 appears to be the bit mask for Inverted DCS tones

# MRT - n DCS Tone will be 0x4xxx values - i DCS Tones will be 0x6xxx values.

# MRT - Chirp Uses N for n DCS Tones and R for i DCS Tones

    def _get_tone(self, _mem, mem):

        def _get_dcs(val):

            code = int("%03o" % (val & 0x07FF))

            pol = (val & 0x2000) and "R" or "N"

            return code, pol

# MRT - Modified the function below to bitwise AND with 0x4000 to check for 935G DCS Tone decoding

# MRT 0x4000 appears to be the bit mask for DCS tones

        tpol = False

# MRT Beta 1.1 - Fix the txtone compare to 0x4000 - was rxtone.

        if _mem.txtone != 0xFFFF and (_mem.txtone & 0x4000) == 0x4000:

            tcode, tpol = _get_dcs(_mem.txtone)

            mem.dtcs = tcode

            txmode = "DTCS"

        elif _mem.txtone != 0xFFFF and _mem.txtone != 0x0:

            mem.rtone = (_mem.txtone & 0x7fff) / 10.0

            txmode = "Tone"

        else:

            txmode = ""

# MRT - Modified the function below to bitwise AND with 0x4000 to check for 935G DCS Tone decoding

        rpol = False

        if _mem.rxtone != 0xFFFF and (_mem.rxtone & 0x4000) == 0x4000:

            rcode, rpol = _get_dcs(_mem.rxtone)

            mem.rx_dtcs = rcode

            rxmode = "DTCS"

        elif _mem.rxtone != 0xFFFF and _mem.rxtone != 0x0:

            mem.ctone = (_mem.rxtone & 0x7fff) / 10.0

            rxmode = "Tone"

        else:

            rxmode = ""

        if txmode == "Tone" and not rxmode:

            mem.tmode = "Tone"

        elif txmode == rxmode and txmode == "Tone" and mem.rtone == mem.ctone:

            mem.tmode = "TSQL"

        elif txmode == rxmode and txmode == "DTCS" and mem.dtcs == mem.rx_dtcs:

            mem.tmode = "DTCS"

        elif rxmode or txmode:

            mem.tmode = "Cross"

            mem.cross_mode = "%s->%s" % (txmode, rxmode)

        # always set it even if no dtcs is used

        mem.dtcs_polarity = "%s%s" % (tpol or "N", rpol or "N")

        LOG.debug("Got TX %s (%i) RX %s (%i)" %

                  (txmode, _mem.txtone, rxmode, _mem.rxtone))

    def get_memory(self, number):

        _mem = self._memobj.memory[number]

        _nam = self._memobj.names[number]

        mem = chirp_common.Memory()

        mem.number = number

        _valid = self._memobj.valid[mem.number]

        LOG.debug("%d %s", number, _valid == MEM_VALID)

        if _valid != MEM_VALID:

            mem.empty = True

            return mem

        else:

            mem.empty = False

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

        if _mem.txfreq == 0xFFFFFFFF:

            # TX freq not set

            mem.duplex = "off"

            mem.offset = 0

        elif int(_mem.rxfreq) == int(_mem.txfreq):

            mem.duplex = ""

            mem.offset = 0

        elif abs(int(_mem.rxfreq) * 10 - int(_mem.txfreq) * 10) > 70000000:

            mem.duplex = "split"

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

        else:

            mem.duplex = int(_mem.rxfreq) > int(_mem.txfreq) and "-" or "+"

            mem.offset = abs(int(_mem.rxfreq) - int(_mem.txfreq)) * 10

        for char in _nam.name:

            if char != 0:

                mem.name += chr(char)

        mem.name = mem.name.rstrip()

        self._get_tone(_mem, mem)

        mem.skip = "" if bool(_mem.scan_add) else "S"

        mem.power = self.POWER_LEVELS[_mem.power]

        mem.mode = _mem.iswide and "FM" or "NFM"

        return mem

    def _set_tone(self, mem, _mem):

        def _set_dcs(code, pol):

#MRT Change from + 0x2800 to bitwise OR with 0x4000 to set the bit for DCS

            val = int("%i" % code, 8) | 0x4000

            if pol == "R":

#MRT Change to 0x2000 from 0x8000 to set the bit for i/R polarity

               val += 0x2000

            return val

        rx_mode = tx_mode = None

        rxtone = txtone = 0x0000

        if mem.tmode == "Tone":

            tx_mode = "Tone"

            rx_mode = None

            txtone = int(mem.rtone * 10) + 0x8000

        elif mem.tmode == "TSQL":

            rx_mode = tx_mode = "Tone"

            rxtone = txtone = int(mem.ctone * 10) + 0x8000

        elif mem.tmode == "DTCS":

            tx_mode = rx_mode = "DTCS"

            txtone = _set_dcs(mem.dtcs, mem.dtcs_polarity[0])

            rxtone = _set_dcs(mem.dtcs, mem.dtcs_polarity[1])

        elif mem.tmode == "Cross":

            tx_mode, rx_mode = mem.cross_mode.split("->")

            if tx_mode == "DTCS":

                txtone = _set_dcs(mem.dtcs, mem.dtcs_polarity[0])

            elif tx_mode == "Tone":

                txtone = int(mem.rtone * 10) + 0x8000

            if rx_mode == "DTCS":

                rxtone = _set_dcs(mem.rx_dtcs, mem.dtcs_polarity[1])

            elif rx_mode == "Tone":

                rxtone = int(mem.ctone * 10) + 0x8000

        _mem.rxtone = rxtone

        _mem.txtone = txtone

        LOG.debug("Set TX %s (%i) RX %s (%i)" %

                  (tx_mode, _mem.txtone, rx_mode, _mem.rxtone))

    def set_memory(self, mem):

        number = mem.number

        _mem = self._memobj.memory[number]

        _nam = self._memobj.names[number]

        if mem.empty:

            _mem.set_raw("\x00" * (_mem.size() / 8))

            self._memobj.valid[number] = 0

            self._memobj.names[number].set_raw("\x00" * (_nam.size() / 8))

            return

        _mem.rxfreq = int(mem.freq / 10)

        if mem.duplex == "off":

            _mem.txfreq = 0xFFFFFFFF

        elif mem.duplex == "split":

            _mem.txfreq = int(mem.offset / 10)

        elif mem.duplex == "off":

            for i in range(0, 4):

                _mem.txfreq[i].set_raw("\xFF")

        elif mem.duplex == "+":

            _mem.txfreq = int(mem.freq / 10) + int(mem.offset / 10)

        elif mem.duplex == "-":

            _mem.txfreq = int(mem.freq / 10) - int(mem.offset / 10)

        else:

            _mem.txfreq = int(mem.freq / 10)

        _mem.scan_add = int(mem.skip != "S")

        _mem.iswide = int(mem.mode == "FM")

        # set the tone

        self._set_tone(mem, _mem)

        # MRT set the scrambler and compander to off by default

        # MRT This changes them in the channel memory

        _mem.scrambler = 0

        _mem.compander = 0

        # set the power

        if mem.power:

            _mem.power = self.POWER_LEVELS.index(mem.power)

        else:

            _mem.power = True

        # MRT set to mute mode to QT (not QT+DTMF or QT*DTMF) by default

        # MRT This changes them in the channel memory

        _mem.mute_mode = 0

        # MRT set unknown5 to 1 and unknown6 to 0 

        # MRT This changes them in the channel memory to match Wouxun CPS

        # MRT it is unknown what impact these values have

        _mem.unknown5 = 1

        _mem.unknown6 = 0

        for i in range(0, len(_nam.name)):

            if i < len(mem.name) and mem.name[i]: