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diff --git a/.gitignore b/.gitignore
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+__pycache__
+/build
diff --git a/LICENSE b/LICENSE
new file mode 100644
index 0000000..9cecc1d
--- /dev/null
+++ b/LICENSE
@@ -0,0 +1,674 @@
+                    GNU GENERAL PUBLIC LICENSE
+                       Version 3, 29 June 2007
+
+ Copyright (C) 2007 Free Software Foundation, Inc. <http://fsf.org/>
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+THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+PURPOSE.  THE ENTIRE RISK AS TO THE QUALITY AND PERFORMANCE OF THE PROGRAM
+IS WITH YOU.  SHOULD THE PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF
+ALL NECESSARY SERVICING, REPAIR OR CORRECTION.
+
+  16. Limitation of Liability.
+
+  IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING
+WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MODIFIES AND/OR CONVEYS
+THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES, INCLUDING ANY
+GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE
+USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED TO LOSS OF
+DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD
+PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER PROGRAMS),
+EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF
+SUCH DAMAGES.
+
+  17. Interpretation of Sections 15 and 16.
+
+  If the disclaimer of warranty and limitation of liability provided
+above cannot be given local legal effect according to their terms,
+reviewing courts shall apply local law that most closely approximates
+an absolute waiver of all civil liability in connection with the
+Program, unless a warranty or assumption of liability accompanies a
+copy of the Program in return for a fee.
+
+                     END OF TERMS AND CONDITIONS
+
+            How to Apply These Terms to Your New Programs
+
+  If you develop a new program, and you want it to be of the greatest
+possible use to the public, the best way to achieve this is to make it
+free software which everyone can redistribute and change under these terms.
+
+  To do so, attach the following notices to the program.  It is safest
+to attach them to the start of each source file to most effectively
+state the exclusion of warranty; and each file should have at least
+the "copyright" line and a pointer to where the full notice is found.
+
+    {one line to give the program's name and a brief idea of what it does.}
+    Copyright (C) {year}  {name of author}
+
+    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/>.
+
+Also add information on how to contact you by electronic and paper mail.
+
+  If the program does terminal interaction, make it output a short
+notice like this when it starts in an interactive mode:
+
+    {project}  Copyright (C) {year}  {fullname}
+    This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
+    This is free software, and you are welcome to redistribute it
+    under certain conditions; type `show c' for details.
+
+The hypothetical commands `show w' and `show c' should show the appropriate
+parts of the General Public License.  Of course, your program's commands
+might be different; for a GUI interface, you would use an "about box".
+
+  You should also get your employer (if you work as a programmer) or school,
+if any, to sign a "copyright disclaimer" for the program, if necessary.
+For more information on this, and how to apply and follow the GNU GPL, see
+<http://www.gnu.org/licenses/>.
+
+  The GNU General Public License does not permit incorporating your program
+into proprietary programs.  If your program is a subroutine library, you
+may consider it more useful to permit linking proprietary applications with
+the library.  If this is what you want to do, use the GNU Lesser General
+Public License instead of this License.  But first, please read
+<http://www.gnu.org/philosophy/why-not-lgpl.html>.
diff --git a/README.rst b/README.rst
new file mode 100644
index 0000000..f694a66
--- /dev/null
+++ b/README.rst
@@ -0,0 +1,46 @@
+stm32ctl
+========
+
+`stm32ctl` enables interaction with STM32 system bootloader based on
+AN3155 USART protocol.
+
+
+Requirements
+------------
+
+* python >=3.8
+
+
+Install
+-------
+
+::
+
+    $ pip install stm32ctl
+
+
+Run
+---
+
+...
+
+
+License
+-------
+
+stm32ctl - STM32 system bootloader control
+
+Copyright (C) 2022 Bozo Kopic
+
+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/>.
diff --git a/build.sh b/build.sh
new file mode 100755
index 0000000..d03adf8
--- /dev/null
+++ b/build.sh
@@ -0,0 +1,12 @@
+#!/bin/sh
+
+set -e
+
+cd $(dirname -- "$0")
+
+PYTHON=${PYTHON:-python3}
+
+$PYTHON setup.py \
+    build --build-base build \
+    egg_info --egg-base build \
+    bdist_wheel --dist-dir build
diff --git a/setup.py b/setup.py
new file mode 100644
index 0000000..f4c38af
--- /dev/null
+++ b/setup.py
@@ -0,0 +1,22 @@
+from pathlib import Path
+from setuptools import setup
+
+
+readme = (Path(__file__).parent / 'README.rst').read_text()
+
+
+setup(
+    name='stm32ctl',
+    version='0.0.1',
+    description='STM32 system bootloader control',
+    long_description=readme,
+    long_description_content_type='text/x-rst',
+    url='https://github.com/bozokopic/stm32ctl',
+    packages=['stm32ctl'],
+    license='GPLv3',
+    classifiers=[
+        'Programming Language :: Python :: 3',
+        'License :: OSI Approved :: GNU General Public License v3 (GPLv3)'],
+    install_requires=['hat-aio~=0.6.3',
+                      'hat-drivers~=0.5.15'],
+    entry_points={'console_scripts': ['stm32ctl = stm32ctl.main:main']})
diff --git a/stm32ctl/__init__.py b/stm32ctl/__init__.py
new file mode 100644
index 0000000..e69de29
--- /dev/null
+++ b/stm32ctl/__init__.py
diff --git a/stm32ctl/__main__.py b/stm32ctl/__main__.py
new file mode 100644
index 0000000..97d2bb2
--- /dev/null
+++ b/stm32ctl/__main__.py
@@ -0,0 +1,8 @@
+import sys
+
+from stm32ctl.main import main
+
+
+if __name__ == '__main__':
+    sys.argv[0] = 'stm32ctl'
+    sys.exit(main())
diff --git a/stm32ctl/args.py b/stm32ctl/args.py
new file mode 100644
index 0000000..c351804
--- /dev/null
+++ b/stm32ctl/args.py
@@ -0,0 +1,383 @@
+from pathlib import Path
+import getopt
+import sys
+import typing
+
+
+class InfoArgs(typing.NamedTuple):
+    pass
+
+
+class ReadArgs(typing.NamedTuple):
+    address: int = 0x0800_0000
+    size: int = 64 * 1024
+    path: Path = Path('-')
+    progress: bool = False
+    verify: bool = False
+
+
+class WriteArgs(typing.NamedTuple):
+    address: int = 0x0800_0000
+    path: Path = Path('-')
+    progress: bool = False
+    verify: bool = False
+
+
+class EraseArgs(typing.NamedTuple):
+    pages: typing.Optional[typing.List[int]] = None
+
+
+class ExecuteArgs(typing.NamedTuple):
+    address: int = 0x0800_0000
+
+
+class ProtectionArgs(typing.NamedTuple):
+    protect_read: bool = False
+    unprotect_read: bool = False
+    protect_write: bool = False
+    unprotect_write: bool = False
+
+
+ActArgs = typing.Union[InfoArgs,
+                       ReadArgs,
+                       WriteArgs,
+                       ExecuteArgs,
+                       EraseArgs,
+                       ProtectionArgs]
+
+
+class Args(typing.NamedTuple):
+    port: str = '/dev/ttyUSB0'
+    baudrate: int = 115200
+    skip_init: bool = False
+    log: typing.Optional[str] = None
+    actions: typing.List[ActArgs] = []
+
+
+usage = r"""Usage:
+  stm32ctl [<global_option>]... [<action> [<action_option>]...]...
+
+STM32 system bootloader control
+
+Actions:
+  info               show device informations
+  read               read binary data
+  write              write binary data
+  erase              erase flash memory
+  execute            start application execution
+  protection         change read/write protection
+
+Global options:
+  --help             show usage
+  --port PORT        serial port (default /dev/ttyUSB0)
+  --baudrate N       serial baudrate (default 115200)
+  --skip-init        skip communication initialization
+  --log {CRITICAL|ERROR|WARNING|INFO|DEBUG|NOTSET}
+                     enable logging with provided minimal level
+
+Read options:
+  --address ADDR     starting address (default 0x0800_0000)
+  --size N           number of bytes (default 64K)
+  --path PATH        output file path or '-' for stdout (default '-')
+  --progress         show progress
+  --verify           verify read data
+
+Write options:
+  --address ADDR     starting address (default 0x0800_0000)
+  --path PATH        input file path or '-' for stdin (default '-')
+  --progress         show progress
+  --verify           verify written data
+
+Erase options:
+  --pages {N|N1-N2},...
+                     erase pages (or pages range) instead of all memory
+
+Execute options:
+  --address ADDR     starting address (default 0x0800_0000)
+
+Protection options:
+  --protect-read     protect read operations
+  --unprotect-read   unprotect read operations
+  --protect-write    protect write operations
+  --unprotect-write  unprotect write operations
+"""
+
+
+def parse_args(argv: typing.List[str]
+               ) -> Args:
+    names = ['help', 'port=', 'baudrate=', 'skip-init', 'log=']
+
+    try:
+        result, rest = getopt.getopt(argv[1:], '', names)
+
+    except getopt.GetoptError as e:
+        print(e, file=sys.stderr)
+        print(usage, file=sys.stderr)
+        sys.exit(1)
+
+    args = Args(actions=[])
+    for name, value in result:
+        if name == '--help':
+            print(usage, file=sys.stderr)
+            sys.exit(1)
+
+        elif name == '--port':
+            args = args._replace(port=_parse_int(value))
+
+        elif name == '--baudrate':
+            args = args._replace(baudrate=_parse_int(value))
+
+        elif name == '--skip-init':
+            args = args._replace(skip_init=True)
+
+        elif name == '--log':
+            if value not in {'CRITICAL', 'ERROR', 'WARNING', 'INFO',
+                             'DEBUG', 'NOTSET'}:
+                print('invalid log level', file=sys.stderr)
+                print(usage, file=sys.stderr)
+                sys.exit(1)
+
+            args = args._replace(log=value)
+
+        else:
+            raise ValueError('unsupported name')
+
+    while rest:
+        if rest[0] == 'info':
+            info_args, rest = _parse_info_args(rest)
+            args.actions.append(info_args)
+
+        elif rest[0] == 'read':
+            read_args, rest = _parse_read_args(rest)
+            args.actions.append(read_args)
+
+        elif rest[0] == 'write':
+            write_args, rest = _parse_write_args(rest)
+            args.actions.append(write_args)
+
+        elif rest[0] == 'erase':
+            erase_args, rest = _parse_erase_args(rest)
+            args.actions.append(erase_args)
+
+        elif rest[0] == 'execute':
+            execute_args, rest = _parse_execute_args(rest)
+            args.actions.append(execute_args)
+
+        elif rest[0] == 'protection':
+            protection_args, rest = _parse_protection_args(rest)
+            args.actions.append(protection_args)
+
+        else:
+            print('unknown action', rest[0], file=sys.stderr)
+            print(usage, file=sys.stderr)
+            sys.exit(1)
+
+    return args
+
+
+def _parse_info_args(argv):
+    names = ['help']
+
+    try:
+        result, rest = getopt.getopt(argv[1:], '', names)
+
+    except getopt.GetoptError as e:
+        print(e, file=sys.stderr)
+        print(usage, file=sys.stderr)
+        sys.exit(1)
+
+    args = InfoArgs()
+    for name, value in result:
+        if name == '--help':
+            print(usage, file=sys.stderr)
+            sys.exit(1)
+
+        else:
+            raise ValueError('unsupported name')
+
+    return args, rest
+
+
+def _parse_read_args(argv):
+    names = ['help', 'address=', 'size=', 'path=', 'progress', 'verify']
+
+    try:
+        result, rest = getopt.getopt(argv[1:], '', names)
+
+    except getopt.GetoptError as e:
+        print(e, file=sys.stderr)
+        print(usage, file=sys.stderr)
+        sys.exit(1)
+
+    args = ReadArgs()
+    for name, value in result:
+        if name == '--help':
+            print(usage, file=sys.stderr)
+            sys.exit(1)
+
+        elif name == '--address':
+            args = args._replace(address=_parse_int(value))
+
+        elif name == '--size':
+            args = args._replace(size=_parse_int(value))
+
+        elif name == '--path':
+            args = args._replace(path=Path(value))
+
+        elif name == '--progress':
+            args = args._replace(progress=True)
+
+        elif name == '--verify':
+            args = args._replace(verify=True)
+
+        else:
+            raise ValueError('unsupported name')
+
+    return args, rest
+
+
+def _parse_write_args(argv):
+    names = ['help', 'address=', 'path=', 'progress', 'verify']
+
+    try:
+        result, rest = getopt.getopt(argv[1:], '', names)
+
+    except getopt.GetoptError as e:
+        print(e, file=sys.stderr)
+        print(usage, file=sys.stderr)
+        sys.exit(1)
+
+    args = WriteArgs()
+    for name, value in result:
+        if name == '--help':
+            print(usage, file=sys.stderr)
+            sys.exit(1)
+
+        elif name == '--address':
+            args = args._replace(address=_parse_int(value))
+
+        elif name == '--path':
+            args = args._replace(path=Path(value))
+
+        elif name == '--progress':
+            args = args._replace(progress=True)
+
+        elif name == '--verify':
+            args = args._replace(verify=True)
+
+        else:
+            raise ValueError('unsupported name')
+
+    return args, rest
+
+
+def _parse_erase_args(argv):
+    names = ['help', 'pages=']
+
+    try:
+        result, rest = getopt.getopt(argv[1:], '', names)
+
+    except getopt.GetoptError as e:
+        print(e, file=sys.stderr)
+        print(usage, file=sys.stderr)
+        sys.exit(1)
+
+    args = EraseArgs()
+    for name, value in result:
+        if name == '--help':
+            print(usage, file=sys.stderr)
+            sys.exit(1)
+
+        elif name == '--pages':
+            args = args._replace(pages=sorted(_parse_pages(value)))
+
+        else:
+            raise ValueError('unsupported name')
+
+    return args, rest
+
+
+def _parse_execute_args(argv):
+    names = ['help', 'address=']
+
+    try:
+        result, rest = getopt.getopt(argv[1:], '', names)
+
+    except getopt.GetoptError as e:
+        print(e, file=sys.stderr)
+        print(usage, file=sys.stderr)
+        sys.exit(1)
+
+    args = ExecuteArgs()
+    for name, value in result:
+        if name == '--help':
+            print(usage, file=sys.stderr)
+            sys.exit(1)
+
+        elif name == '--address':
+            args = args._replace(address=_parse_int(value))
+
+        else:
+            raise ValueError('unsupported name')
+
+    return args, rest
+
+
+def _parse_protection_args(argv):
+    names = ['help', 'protect-read', 'unprotect-read', 'protect-write',
+             'unprotect-write']
+
+    try:
+        result, rest = getopt.getopt(argv[1:], '', names)
+
+    except getopt.GetoptError as e:
+        print(e, file=sys.stderr)
+        print(usage, file=sys.stderr)
+        sys.exit(1)
+
+    args = ProtectionArgs()
+    for name, value in result:
+        if name == '--help':
+            print(usage, file=sys.stderr)
+            sys.exit(1)
+
+        elif name == '--protect-read':
+            args = args._replace(protect_read=True)
+
+        elif name == '--unprotect-read':
+            args = args._replace(unprotect_read=True)
+
+        elif name == '--protect-write':
+            args = args._replace(protect_write=True)
+
+        elif name == '--unprotect-write':
+            args = args._replace(unprotect_write=True)
+
+        else:
+            raise ValueError('unsupported name')
+
+    return args, rest
+
+
+def _parse_int(x):
+    if x.endswith('K'):
+        return _parse_int(x[:-1]) * 1024
+
+    if x.startswith('0x'):
+        return int(x, base=16)
+
+    return int(x)
+
+
+def _parse_pages(value):
+    for segment in value.split(','):
+        if not segment:
+            continue
+
+        if '-' not in segment:
+            yield int(segment)
+            continue
+
+        start_str, stop_str = segment.split('-', 1)
+        start, stop = int(start_str), int(stop_str)
+        yield from range(start, stop + 1)
diff --git a/stm32ctl/client.py b/stm32ctl/client.py
new file mode 100644
index 0000000..d0b97aa
--- /dev/null
+++ b/stm32ctl/client.py
@@ -0,0 +1,165 @@
+import collections
+import itertools
+import struct
+import typing
+import enum
+
+from hat import aio
+
+from stm32ctl.connection import (CmdType,
+                                 connect)
+
+
+ProgressCb = typing.Callable[[int, int], None]
+
+
+class Protection(enum.Enum):
+    PROTECT_READ = 0
+    UNPROTECT_READ = 1
+    PROTECT_WRITE = 2
+    UNPROTECT_WRITE = 3
+
+
+class Info(typing.NamedTuple):
+    version: int
+    chip_id: int
+    device_id: bytes
+    flash_size: int
+
+
+async def create_client(port: str,
+                        baudrate: int,
+                        skip_init: bool
+                        ) -> 'Client':
+    client = Client()
+    client._conn = await connect(port=port,
+                                 baudrate=baudrate,
+                                 skip_init=skip_init)
+
+    try:
+        res = await client._conn.get_commands()
+        client._version = res.version
+        client._cmd_types = res.cmd_types
+
+    except Exception:
+        await aio.uncancellable(client.async_close())
+        raise
+
+    return client
+
+
+class Client(aio.Resource):
+
+    @property
+    def async_group(self):
+        return self._conn.async_group
+
+    async def get_info(self) -> Info:
+        if CmdType.GET_CHIP_ID not in self._cmd_types:
+            raise Exception('get chip id not supported')
+
+        if CmdType.READ not in self._cmd_types:
+            raise Exception('read not supported')
+
+        chip_id = await self._conn.get_chip_id()
+        device_id = await self._conn.read(0x1FFF_F7E8, 12)
+        flash_size_bytes = await self._conn.read(0x1FFF_F7E0, 2)
+
+        flash_size = struct.unpack('<H', flash_size_bytes)[0] * 1024
+
+        return Info(version=self._version,
+                    chip_id=chip_id,
+                    device_id=device_id,
+                    flash_size=flash_size)
+
+    async def set_protection(self, protection: Protection):
+        if protection == Protection.PROTECT_READ:
+            if CmdType.PROTECT_READ not in self._cmd_types:
+                raise Exception('protect read not supported')
+
+            await self._conn.protect_read()
+
+        elif protection == Protection.UNPROTECT_READ:
+            if CmdType.UNPROTECT_READ not in self._cmd_types:
+                raise Exception('unprotect read not supported')
+
+            await self._conn.unprotect_read()
+
+        elif protection == Protection.PROTECT_WRITE:
+            if CmdType.PROTECT_WRITE not in self._cmd_types:
+                raise Exception('protect write not supported')
+
+            await self._conn.protect_write()
+
+        elif protection == Protection.UNPROTECT_WRITE:
+            if CmdType.UNPROTECT_WRITE not in self._cmd_types:
+                raise Exception('unprotect write not supported')
+
+            await self._conn.unprotect_write()
+
+        else:
+            raise ValueError('unsupported protection')
+
+    async def read(self,
+                   start_address: int,
+                   size: int,
+                   progress_cb: typing.Optional[ProgressCb] = None
+                   ) -> bytes:
+        if CmdType.READ not in self._cmd_types:
+            raise Exception('read not supported')
+
+        if progress_cb:
+            total_size = size
+            read_size = 0
+            progress_cb(read_size, total_size)
+
+        segments = collections.deque()
+        while size > 0:
+            segment_size = min(size, 0x100)
+            segment = await self._conn.read(start_address, segment_size)
+
+            segments.append(segment)
+            start_address += segment_size
+            size -= segment_size
+
+            if progress_cb:
+                read_size += segment_size
+                progress_cb(read_size, total_size)
+
+        return bytes(itertools.chain.from_iterable(segments))
+
+    async def write(self,
+                    start_address: int,
+                    data: bytes,
+                    progress_cb: typing.Optional[ProgressCb] = None):
+        if CmdType.WRITE not in self._cmd_types:
+            raise Exception('write not supported')
+
+        if progress_cb:
+            total_size = len(data)
+            written_size = 0
+            progress_cb(written_size, total_size)
+
+        data = memoryview(data)
+        while data:
+            segment_size = min(len(data), 0x100)
+            await self._conn.write(start_address, data[:segment_size])
+
+            data = data[segment_size:]
+            start_address += segment_size
+
+            if progress_cb:
+                written_size += segment_size
+                progress_cb(written_size, total_size)
+
+    async def erase(self, pages: typing.Optional[typing.List[int]] = None):
+        if CmdType.ERASE not in self._cmd_types:
+            raise Exception('erase not supported')
+
+        await self._conn.erase(pages)
+
+    async def execute(self, start_address: int):
+        if CmdType.EXECUTE not in self._cmd_types:
+            raise Exception('execute not supported')
+
+        await self._conn.execute(start_address)
diff --git a/stm32ctl/connection.py b/stm32ctl/connection.py
new file mode 100644
index 0000000..8c8a582
--- /dev/null
+++ b/stm32ctl/connection.py
@@ -0,0 +1,269 @@
+import enum
+import typing
+import struct
+import itertools
+import logging
+
+from hat import aio
+from hat.drivers import serial
+
+
+mlog = logging.getLogger(__name__)
+
+
+class CmdType(enum.Enum):
+    GET_COMMANDS = 0x00
+    GET_PROTECTION = 0x01
+    GET_CHIP_ID = 0x02
+    READ = 0x11
+    EXECUTE = 0x21
+    WRITE = 0x31
+    ERASE = 0x43
+    ERASE_EXTENDED = 0x44
+    SPECIAL = 0x50
+    SPECIAL_EXTENDED = 0x51
+    PROTECT_READ = 0x82
+    UNPROTECT_READ = 0x92
+    PROTECT_WRITE = 0x63
+    UNPROTECT_WRITE = 0x73
+    CHECK_CRC = 0xA1
+
+
+class CommandsRes(typing.NamedTuple):
+    version: int
+    cmd_types: typing.Set[CmdType]
+
+
+class ProtectionRes(typing.NamedTuple):
+    version: int
+    status: int
+    counter: int
+
+
+async def connect(port: str,
+                  baudrate: int,
+                  skip_init: bool
+                  ) -> 'Connection':
+    conn = Connection()
+
+    mlog.debug('opening serial endpoint on %s', port)
+    conn._conn = await serial.create(port,
+                                     baudrate=baudrate,
+                                     parity=serial.Parity.EVEN)
+
+    if skip_init:
+        return conn
+
+    try:
+        mlog.debug('sending initial byte')
+        await conn._conn.write(b'\x7F')
+        await conn._receive_ack()
+
+    except Exception:
+        await aio.uncancellable(conn.async_close())
+        raise
+
+    return conn
+
+
+class Connection(aio.Resource):
+
+    @property
+    def async_group(self):
+        return self._conn.async_group
+
+    async def get_commands(self) -> CommandsRes:
+        mlog.debug('sending get commands command')
+        await self._send([CmdType.GET_COMMANDS.value])
+
+        count_bytes = await self._conn.read(1)
+        count = count_bytes[0]
+
+        version_bytes = await self._conn.read(1)
+        version = version_bytes[0]
+        mlog.debug('received version %s', version)
+
+        cmd_types_bytes = await self._conn.read(count)
+        cmd_types = {CmdType(i) for i in cmd_types_bytes}
+
+        if mlog.isEnabledFor(logging.DEBUG):
+            mlog.debug('received supported commands (%s)',
+                       ', '.join(hex(i.value) for i in cmd_types))
+
+        await self._receive_ack()
+
+        return CommandsRes(version, cmd_types)
+
+    async def get_protection(self) -> ProtectionRes:
+        mlog.debug('sending get protection command')
+        await self._send([CmdType.GET_PROTECTION.value])
+
+        version_bytes = await self._conn.read(1)
+        version = version_bytes[0]
+        mlog.debug('received version %s', version)
+
+        protection_bytes = await self._conn.read(2)
+        status, counter = protection_bytes
+        mlog.debug('received status %s and counter %s', status, counter)
+
+        await self._receive_ack()
+
+        return ProtectionRes(version, status, counter)
+
+    async def get_chip_id(self) -> int:
+        mlog.debug('sending get chip id command')
+        await self._send([CmdType.GET_CHIP_ID.value])
+
+        count_bytes = await self._conn.read(1)
+        count = count_bytes[0]
+
+        chip_id_bytes = await self._conn.read(count + 1)
+        chip_id = int.from_bytes(chip_id_bytes, byteorder='big')
+        mlog.debug('received chip id %s', chip_id)
+
+        await self._receive_ack()
+
+        return chip_id
+
+    async def read(self,
+                   start_address: int,
+                   size: int
+                   ) -> bytes:
+        if size > 0x100:
+            raise ValueError('unsupported size')
+
+        mlog.debug('sending read command')
+        await self._send([CmdType.READ.value])
+
+        mlog.debug('sending start address %s', start_address)
+        start_address_bytes = struct.pack('>I', start_address)
+        await self._send(start_address_bytes)
+
+        mlog.debug('sending size %s', size)
+        await self._send([size - 1])
+
+        data = await self._conn.read(size)
+
+        return data
+
+    async def write(self,
+                    start_address: int,
+                    data: bytes):
+        size = len(data)
+        if size > 0x100 or size < 1:
+            raise ValueError('unsupported data')
+
+        mlog.debug('sending write command')
+        await self._send([CmdType.WRITE.value])
+
+        mlog.debug('sending start address %s', start_address)
+        start_address_bytes = struct.pack('>I', start_address)
+        await self._send(start_address_bytes)
+
+        mlog.debug('sending write data (length %s)', len(data))
+        await self._send(itertools.chain([size - 1], data))
+
+    async def execute(self, start_address: int):
+        mlog.debug('sending execute command')
+        await self._send([CmdType.EXECUTE.value])
+
+        mlog.debug('sending start address %s', start_address)
+        start_address_bytes = struct.pack('>I', start_address)
+        await self._send(start_address_bytes)
+
+    async def erase(self, pages: typing.Optional[typing.List[int]] = None):
+        if pages is not None:
+            size = len(pages)
+            if size < 1 or size > 0xFF:
+                raise ValueError('unsupported pages length')
+
+        mlog.debug('sending erase command')
+        await self._send([CmdType.ERASE.value])
+
+        if pages is None:
+            mlog.debug('sending erase all pages')
+            await self._send([0xFF])
+            return
+
+        if mlog.isEnabledFor(logging.DEBUG):
+            log_data = (f'count {size}' if size > 10
+                        else f'pages {", ".join(str(page) for page in pages)}')
+            mlog.debug('sending erase pages (%s)', log_data)
+
+        await self._send(itertools.chain([size - 1], pages))
+
+    async def erase_extended(self):
+        raise NotImplementedError()
+
+    async def protect_read(self):
+        mlog.debug('sending protect read command')
+        await self._send([CmdType.PROTECT_READ.value])
+
+        await self._receive_ack()
+
+    async def unprotect_read(self):
+        mlog.debug('sending unprotect read command')
+        await self._send([CmdType.UNPROTECT_READ.value])
+
+        await self._receive_ack()
+
+    async def protect_write(self):
+        raise NotImplementedError()
+
+    async def unprotect_write(self):
+        mlog.debug('sending unprotect write command')
+        await self._send([CmdType.UNPROTECT_WRITE.value])
+
+        await self._receive_ack()
+
+    async def special(self):
+        raise NotImplementedError()
+
+    async def special_extended(self):
+        raise NotImplementedError()
+
+    async def check_crc(self) -> int:
+        raise NotImplementedError()
+
+    async def _send(self, data):
+        data_with_checksum = bytes(_get_data_with_checksum(data))
+
+        if mlog.isEnabledFor(logging.DEBUG):
+            size = len(data_with_checksum)
+            log_data = (f'length {size}' if size > 10
+                        else data_with_checksum.hex(' '))
+            mlog.debug('sending data with checksum (%s)', log_data)
+
+        await self._conn.write(data_with_checksum)
+
+        await self._receive_ack()
+
+    async def _receive_ack(self):
+        mlog.debug('waiting for ACK')
+        res = await self._conn.read(1)
+
+        if res == b'\x1f':
+            raise Exception('received NACK')
+
+        if res != b'\x79':
+            raise Exception(f'received unknown response: 0x{res[0]:02x}')
+
+        mlog.debug('received ACK')
+
+
+def _get_data_with_checksum(data):
+    count = 0
+    crc = 0
+
+    for i in data:
+        crc = 0xFF & (crc ^ i)
+        count += 1
+        yield i
+
+    if count < 1:
+        raise ValueError('invalid data size')
+
+    if count < 2:
+        crc = 0xFF & ~crc
+
+    yield crc
diff --git a/stm32ctl/main.py b/stm32ctl/main.py
new file mode 100644
index 0000000..3090f41
--- /dev/null
+++ b/stm32ctl/main.py
@@ -0,0 +1,173 @@
+from pathlib import Path
+import asyncio
+import contextlib
+import functools
+import io
+import logging.config
+import sys
+
+from hat import aio
+
+from stm32ctl.args import (InfoArgs,
+                           ReadArgs,
+                           WriteArgs,
+                           EraseArgs,
+                           ExecuteArgs,
+                           ProtectionArgs,
+                           Args,
+                           parse_args)
+from stm32ctl.client import (Protection,
+                             create_client)
+
+
+def main():
+    args = parse_args(sys.argv)
+
+    if args.log:
+        _set_logging(args.log)
+
+    stdin, sys.stdin = sys.stdin.detach(), None
+    stdout, sys.stdout = sys.stdout.detach(), None
+
+    with contextlib.suppress(asyncio.CancelledError):
+        aio.run_asyncio(async_main(args, stdin, stdout))
+
+
+async def async_main(args: Args,
+                     stdin: io.BufferedReader,
+                     stdout: io.BufferedWriter):
+    client = await create_client(port=args.port,
+                                 baudrate=args.baudrate,
+                                 skip_init=args.skip_init)
+
+    try:
+        for action_args in args.actions:
+            if isinstance(action_args, InfoArgs):
+                await _act_info(client, action_args, stdout)
+
+            elif isinstance(action_args, ReadArgs):
+                await _act_read(client, action_args, stdout, not args.log)
+
+            elif isinstance(action_args, WriteArgs):
+                await _act_write(client, action_args, stdin, not args.log)
+
+            elif isinstance(action_args, EraseArgs):
+                await _act_erase(client, action_args)
+
+            elif isinstance(action_args, ExecuteArgs):
+                await _act_execute(client, action_args)
+
+            elif isinstance(action_args, ProtectionArgs):
+                await _act_protection(client, action_args)
+
+            else:
+                raise ValueError('unsupported action')
+
+    finally:
+        await client.async_close()
+
+
+def _set_logging(log_level):
+    logging.config.dictConfig({
+        'version': 1,
+        'formatters': {
+            'formater': {
+                'format': '[%(asctime)s %(levelname)s %(name)s] %(message)s'}},
+        'handlers': {
+            'handler': {
+                'class': 'logging.StreamHandler',
+                'formatter': 'formater',
+                'level': log_level}},
+        'root': {
+            'level': log_level,
+            'handlers': ['handler']},
+        'disable_existing_loggers': False})
+
+
+async def _act_info(client, args, stdout):
+    info = await client.get_info()
+
+    stdout.write(
+        f'version: 0x{info.version:02x}\n'
+        f'chip id: 0x{info.chip_id:04x}\n'
+        f'device id: {info.device_id.hex(" ")}\n'
+        f'flash size: {info.flash_size / 1024}K\n'.encode('utf-8'))
+    stdout.flush()
+
+
+async def _act_read(client, args, stdout, dynamic_progress):
+    # TODO verify
+
+    if args.progress and dynamic_progress:
+        progress_cb = functools.partial(_print_progress, '\rreading:', '')
+
+    elif args.progress:
+        progress_cb = functools.partial(_print_progress, 'reading:', '\n')
+
+    else:
+        progress_cb = None
+
+    data = await client.read(args.address, args.size, progress_cb)
+
+    if args.progress and dynamic_progress:
+        print(file=sys.stderr, flush=True)
+
+    if args.path == Path('-'):
+        stdout.write(data)
+        stdout.flush()
+
+    else:
+        args.path.write_bytes(data)
+
+
+async def _act_write(client, args, stdin, dynamic_progress):
+    # TODO verify
+
+    data = (stdin.read() if args.path == Path('-')
+            else args.path.read_bytes())
+
+    if args.progress and dynamic_progress:
+        progress_cb = functools.partial(_print_progress, '\rwriting:', '')
+
+    elif args.progress:
+        progress_cb = functools.partial(_print_progress, 'writing:', '\n')
+
+    else:
+        progress_cb = None
+
+    await client.write(args.address, data, progress_cb)
+
+    if args.progress and dynamic_progress:
+        print(file=sys.stderr, flush=True)
+
+
+async def _act_erase(client, args):
+    await client.erase(args.pages)
+
+
+async def _act_execute(client, args):
+    await client.execute(args.address)
+
+
+async def _act_protection(client, args):
+    if args.protect_read:
+        await client.set_protection(Protection.PROTECT_READ)
+
+    if args.unprotect_read:
+        await client.set_protection(Protection.UNPROTECT_READ)
+
+    if args.protect_write:
+        await client.set_protection(Protection.PROTECT_WRITE)
+
+    if args.unprotect_write:
+        await client.set_protection(Protection.UNPROTECT_WRITE)
+
+
+def _print_progress(msg, end, current, total):
+    print(msg, f'{current}/{total} ({int(100 * current / total)}%)',
+          end=end, file=sys.stderr, flush=True)
+
+
+if __name__ == '__main__':
+    sys.argv[0] = 'stm32ctl'
+    sys.exit(main())