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dfu_transport_ant.py
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dfu_transport_ant.py
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#
# Copyright (c) 2016-2018 Nordic Semiconductor ASA
# All rights reserved.
#
# Redistribution and use in source and binary forms, with or without modification,
# are permitted provided that the following conditions are met:
#
# 1. Redistributions of source code must retain the above copyright notice, this
# list of conditions and the following disclaimer.
#
# 2. Redistributions in binary form must reproduce the above copyright notice, this
# list of conditions and the following disclaimer in the documentation and/or
# other materials provided with the distribution.
#
# 3. Neither the name of Nordic Semiconductor ASA nor the names of other
# contributors to this software may be used to endorse or promote products
# derived from this software without specific prior written permission.
#
# 4. This software must only be used in or with a processor manufactured by Nordic
# Semiconductor ASA, or in or with a processor manufactured by a third party that
# is used in combination with a processor manufactured by Nordic Semiconductor.
#
# 5. Any software provided in binary or object form under this license must not be
# reverse engineered, decompiled, modified and/or disassembled.
#
# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
# ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
# WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
# DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR
# ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
# (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
# LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
# ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
# SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
#
# Python imports
import binascii
from datetime import datetime
import logging
import queue
import struct
import sys
# Python 3rd party imports
try:
import antlib
import antlib.antdefines as antdefines
import antlib.antmessage as antmessage
except ImportError as e:
print(e)
raise Exception("Try running 'pip install antlib'.")
# Nordic Semiconductor imports
from nordicsemi.dfu.dfu_transport import DfuTransport, DfuEvent, TRANSPORT_LOGGING_LEVEL
from pc_ble_driver_py.exceptions import NordicSemiException
def platform_supported():
"""
A platform check should be performed before using this module.
Only a python 32bit interpreter on windows is supported. The 'antlib'
package depends on precompiled windows 32bit libraries.
:return: True if platform is windows 32bit or False otherwise.
:rtype: bool
"""
can_run = False
if sys.platform in ["win32", "win64"]:
# Check if Python is 32 bit.
if struct.calcsize("P") * 8 == 32:
can_run = True
if not can_run:
print("The ant dfu command is only available on Windows with a 32bit Python \n"
"which can be downloaded here: 'https://www.python.org/downloads/windows/'.")
return can_run
class ValidationException(NordicSemiException):
""""
Exception used when validation failed
"""
pass
logger = logging.getLogger(__name__)
class AntParams:
# 2466 MHz
DEF_RF_FREQ = 66
# 16 Hz
DEF_CHANNEL_PERIOD = 2048
# Wildcard specific device.
DEF_DEVICE_NUM = 0
DEF_DEVICE_TYPE = 10
DEF_TRANS_TYPE = 0
DEF_NETWORK_KEY = None
def __init__(self):
self.rf_freq = self.DEF_RF_FREQ
self.channel_period = self.DEF_CHANNEL_PERIOD
self.device_num = self.DEF_DEVICE_NUM
self.device_type = self.DEF_DEVICE_TYPE
self.trans_type = self.DEF_TRANS_TYPE
self.network_key = self.DEF_NETWORK_KEY
class DfuAdapter:
ANT_RSP_TIMEOUT = 100
ANT_DFU_CHAN = 0
ANT_NET_KEY_IDX = 0
DATA_MESGS = (
antmessage.MESG_BROADCAST_DATA_ID,
antmessage.MESG_ACKNOWLEDGED_DATA_ID,
antmessage.MESG_BURST_DATA_ID,
antmessage.MESG_ADV_BURST_DATA_ID)
def __init__(self, ant_dev, timeout, search_timeout, ant_config):
self.ant_dev = ant_dev
self.timeout = timeout
self.search_timeout = search_timeout
self.ant_config = ant_config
self.connected = False
self.tx_result = None
self.beacon_rx = False
self.tx_seq = None
self.rx_seq = None
self.rx_data = None
self.resp_queue = queue.Queue()
def open(self):
# TODO: use constant from antlib when it exists.
# Set up advanced burst with optional frequency hopping. This can help
# Increase the throughput by about 3x.
self.ant_dev.configure_advanced_burst(True, 3, 0, 0x01,
response_time_msec=self.ANT_RSP_TIMEOUT)
if self.ant_config.network_key is not None:
self.ant_dev.set_network_key(self.ANT_NET_KEY_IDX,
self.ant_config.network_key)
self.ant_dev.assign_channel(self.ANT_DFU_CHAN, antdefines.CHANNEL_TYPE_SLAVE,
self.ANT_NET_KEY_IDX, response_time_msec=self.ANT_RSP_TIMEOUT)
# The params here are fairly arbitrary, but must match what the device
# uses. These match the defaults in the example projects.
self.ant_dev.set_channel_freq(self.ANT_DFU_CHAN,
self.ant_config.rf_freq, response_time_msec=self.ANT_RSP_TIMEOUT)
self.ant_dev.set_channel_period(self.ANT_DFU_CHAN,
self.ant_config.channel_period,
response_time_msec=self.ANT_RSP_TIMEOUT)
self.ant_dev.set_channel_id(self.ANT_DFU_CHAN,
self.ant_config.device_num, self.ant_config.device_type,
self.ant_config.trans_type, response_time_msec=self.ANT_RSP_TIMEOUT)
# Disable high priority search. It doesn't matter much which search
# is used as there are no other open channels, but configuring only
# one makes sure the timeout arrives when expected.
self.ant_dev.set_channel_search_timeout(self.ANT_DFU_CHAN, 0,
response_time_msec=self.ANT_RSP_TIMEOUT)
self.ant_dev.set_low_priority_search_timeout(
self.ANT_DFU_CHAN,
int(self.search_timeout / 2.5),
response_time_msec=self.ANT_RSP_TIMEOUT)
self.ant_dev.open_channel(self.ANT_DFU_CHAN,
response_time_msec=self.ANT_RSP_TIMEOUT)
self.__wait_for_condition(
lambda: self.connected, self.search_timeout + 1.0)
def close(self):
self.ant_dev.reset_system(response_time_msec=self.ANT_RSP_TIMEOUT)
self.ant_dev.ant_close()
self.ant_dev = None
def send_message(self, req):
logger.log(TRANSPORT_LOGGING_LEVEL, "ANT: --> {}".format(req))
self.tx_seq = (self.tx_seq + 1) & 0xFF
data = list(struct.pack('<HB', len(req) + 3, self.tx_seq)) + req
self.tx_result = None
while self.tx_result != True:
self.tx_result = None
self.ant_dev.send_burst(self.ANT_DFU_CHAN, data)
self.__wait_for_condition(lambda: self.tx_result is not None)
# Wait for a beacon, needed in tx fail case to allow for flush of
# any sequence number errors that could interrupt the burst.
self.beacon_rx = False
self.__wait_for_condition(lambda: self.beacon_rx)
def get_message(self):
self.__wait_for_condition(lambda: not self.resp_queue.empty())
mesg = self.resp_queue.get_nowait()
logger.log(TRANSPORT_LOGGING_LEVEL, "ANT: <-- {}".format(mesg))
return mesg
def __wait_for_condition(self, cond, timeout=None):
if timeout is None:
timeout = self.timeout
start = datetime.now()
while not cond():
self.__process_mesg(timeout -
(datetime.now() - start).total_seconds())
def __process_mesg(self, timeout):
mesg = self.__get_ant_mesg(timeout)
if (mesg.msgid in self.DATA_MESGS):
self.__process_data_mesg(mesg)
elif (mesg.msgid == antmessage.MESG_RESPONSE_EVENT_ID):
if (mesg.data[1] == antmessage.MESG_EVENT_ID):
self.__process_evt(mesg.data[2])
def __process_data_mesg(self, mesg):
if (mesg.msgid == antmessage.MESG_BROADCAST_DATA_ID):
self.connected = True
self.beacon_rx = True
# Broadcast data should always contain the current sequence numbers.
if (self.tx_seq is None):
self.tx_seq = mesg.data[1]
if (self.rx_seq is None):
self.rx_seq = mesg.data[2]
return
if not self.connected:
# Ignore non-broadcast data until connection is established.
return
data = mesg.data[1:1+antdefines.ANT_STANDARD_DATA_PAYLOAD_SIZE]
is_first = False
is_last = False
if (mesg.msgid == antmessage.MESG_ACKNOWLEDGED_DATA_ID):
is_first = is_last = True
else:
if mesg.sequence_number == antdefines.SEQUENCE_FIRST_MESSAGE:
is_first = True
if (mesg.sequence_number & antdefines.SEQUENCE_LAST_MESSAGE) != 0:
is_last = True
if (mesg.msgid == antmessage.MESG_ADV_BURST_DATA_ID):
data = mesg.data[1:]
if is_first:
self.rx_data = data
else:
self.rx_data += data
if is_last:
self.__process_resp()
self.rx_data = None
def __process_resp(self):
(size, seq) = struct.unpack('<HB', bytearray(self.rx_data[:3]))
if seq == self.rx_seq:
logger.debug("Duplicate response received")
return
self.rx_seq = seq
self.resp_queue.put(self.rx_data[3:size])
def __process_evt(self, evt):
if (evt == antdefines.EVENT_CHANNEL_CLOSED):
raise NordicSemiException("Device connection lost")
elif (evt == antdefines.EVENT_TRANSFER_TX_COMPLETED):
self.tx_result = True
elif (evt == antdefines.EVENT_TRANSFER_TX_FAILED):
self.tx_result = False
elif (evt == antdefines.EVENT_TRANSFER_RX_FAILED):
self.rx_data = None
def __get_ant_mesg(self, timeout):
mesg = None
if self.ant_dev.wait_for_message(int(timeout * 1000)):
mesg = self.ant_dev.get_message()
if not mesg:
raise NordicSemiException('No message received from device')
return mesg
class DfuTransportAnt(DfuTransport):
ANT_RST_TIMEOUT_MS = 500
DEFAULT_PORT = 0
DEFAULT_CMD_TIMEOUT = 5.0 # Timeout on waiting for a response.
DEFAULT_SEARCH_TIMEOUT = 10.0 # Timeout when searching for the device.
DEFAULT_PRN = 0
DEFAULT_DO_PING = True
DEFAULT_DO_DEBUG = False
OP_CODE = {
'CreateObject' : 0x01,
'SetPRN' : 0x02,
'CalcChecSum' : 0x03,
'Execute' : 0x04,
'ReadError' : 0x05,
'ReadObject' : 0x06,
'GetSerialMTU' : 0x07,
'WriteObject' : 0x08,
'Ping' : 0x09,
'Response' : 0x60,
}
def __init__(self,
ant_config=None,
port=DEFAULT_PORT,
timeout=DEFAULT_CMD_TIMEOUT,
search_timeout=DEFAULT_SEARCH_TIMEOUT,
prn=DEFAULT_PRN,
debug=DEFAULT_DO_DEBUG):
super().__init__()
if ant_config is None:
ant_config = AntParams()
self.ant_config = ant_config
self.port = port
self.timeout = timeout
self.search_timeout = search_timeout
self.prn = prn
self.ping_id = 0
self.dfu_adapter = None
self.mtu = 0
self.debug = debug
def open(self):
super().open()
ant_dev = None
try:
ant_dev = antlib.ANTDevice(self.port, 57600,
antlib.antdevice.ANTDevice.USB_PORT_TYPE,
antlib.antdevice.ANTDevice.FRAMER_TYPE_BASIC)
ant_dev.reset_system(response_time_msec=self.ANT_RST_TIMEOUT_MS)
# There might be a back log of messages, clear them out.
while ant_dev.get_message():
pass
if (self.debug):
ant_dev.enable_debug_logging()
except Exception as e:
raise NordicSemiException(
"Could not open {0}. Reason: {1}".format(ant_dev, e.message))
self.dfu_adapter = DfuAdapter(
ant_dev, self.timeout, self.search_timeout, self.ant_config)
self.dfu_adapter.open()
if not self.__ping():
raise NordicSemiException("No ping response from device.")
self.__set_prn()
self.__get_mtu()
def close(self):
super().close()
self.dfu_adapter.close()
def send_init_packet(self, init_packet):
def try_to_recover():
if response['offset'] == 0 or response['offset'] > len(init_packet):
# There is no init packet or present init packet is too long.
return False
expected_crc = (binascii.crc32(init_packet[:response['offset']]) & 0xFFFFFFFF)
if expected_crc != response['crc']:
# Present init packet is invalid.
return False
if len(init_packet) > response['offset']:
# Send missing part.
try:
self.__stream_data(data = init_packet[response['offset']:],
crc = expected_crc,
offset = response['offset'])
except ValidationException:
return False
self.__execute()
return True
response = self.__select_command()
assert len(init_packet) <= response['max_size'], 'Init command is too long'
if try_to_recover():
return
try:
self.__create_command(len(init_packet))
self.__stream_data(data=init_packet)
self.__execute()
except ValidationException:
raise NordicSemiException("Failed to send init packet")
def send_firmware(self, firmware):
def try_to_recover():
if response['offset'] == 0:
# Nothing to recover
return
expected_crc = binascii.crc32(firmware[:response['offset']]) & 0xFFFFFFFF
remainder = response['offset'] % response['max_size']
if (expected_crc != response['crc']) or (remainder == 0):
# Invalid CRC. Remove corrupted data.
# DFU lib can't deal with recovering straight to an execute commamd,
# so treat remainder of 0 as a corrupted block too.
response['offset'] -= remainder if remainder != 0 else response['max_size']
response['crc'] = \
binascii.crc32(firmware[:response['offset']]) & 0xFFFFFFFF
return
if (remainder != 0) and (response['offset'] != len(firmware)):
# Send rest of the page.
try:
to_send = firmware[response['offset'] : response['offset']
+ response['max_size'] - remainder]
response['crc'] = self.__stream_data(data = to_send,
crc = response['crc'],
offset = response['offset'])
response['offset'] += len(to_send)
except ValidationException:
# Remove corrupted data.
response['offset'] -= remainder
response['crc'] = \
binascii.crc32(firmware[:response['offset']]) & 0xFFFFFFFF
return
self.__execute()
self._send_event(event_type=DfuEvent.PROGRESS_EVENT, progress=response['offset'])
response = self.__select_data()
try_to_recover()
for i in range(response['offset'], len(firmware), response['max_size']):
data = firmware[i:i+response['max_size']]
try:
self.__create_data(len(data))
response['crc'] = self.__stream_data(data=data, crc=response['crc'], offset=i)
self.__execute()
except ValidationException:
raise NordicSemiException("Failed to send firmware")
self._send_event(event_type=DfuEvent.PROGRESS_EVENT, progress=len(data))
def __set_prn(self):
logger.debug("ANT: Set Packet Receipt Notification {}".format(self.prn))
self.dfu_adapter.send_message([DfuTransportAnt.OP_CODE['SetPRN']]
+ list(struct.pack('<H', self.prn)))
self.__get_response(DfuTransportAnt.OP_CODE['SetPRN'])
def __get_mtu(self):
self.dfu_adapter.send_message([DfuTransportAnt.OP_CODE['GetSerialMTU']])
response = self.__get_response(DfuTransportAnt.OP_CODE['GetSerialMTU'])
self.mtu = struct.unpack('<H', bytearray(response))[0]
def __ping(self):
self.ping_id = (self.ping_id + 1) % 256
self.dfu_adapter.send_message([DfuTransportAnt.OP_CODE['Ping'], self.ping_id])
resp = self.dfu_adapter.get_message() # Receive raw response to check return code
if (resp is None):
logger.debug('ANT: No ping response')
return False
if resp[0] != DfuTransportAnt.OP_CODE['Response']:
logger.debug('ANT: No Response: 0x{:02X}'.format(resp[0]))
return False
if resp[1] != DfuTransportAnt.OP_CODE['Ping']:
logger.debug('ANT: Unexpected Executed OP_CODE.\n' \
+ 'Expected: 0x{:02X} Received: 0x{:02X}'.format(DfuTransportAnt.OP_CODE['Ping'], resp[1]))
return False
if resp[2] != DfuTransport.RES_CODE['Success']:
# Returning an error code is seen as good enough. The bootloader is up and running
return True
else:
if struct.unpack('B', bytearray(resp[3:]))[0] == self.ping_id:
return True
else:
return False
def __create_command(self, size):
self.__create_object(0x01, size)
def __create_data(self, size):
self.__create_object(0x02, size)
def __create_object(self, object_type, size):
self.dfu_adapter.send_message([DfuTransportAnt.OP_CODE['CreateObject'], object_type]\
+ list(struct.pack('<L', size)))
self.__get_response(DfuTransportAnt.OP_CODE['CreateObject'])
def __calculate_checksum(self):
self.dfu_adapter.send_message([DfuTransportAnt.OP_CODE['CalcChecSum']])
response = self.__get_response(DfuTransportAnt.OP_CODE['CalcChecSum'])
(offset, crc) = struct.unpack('<II', bytearray(response))
return {'offset': offset, 'crc': crc}
def __execute(self):
self.dfu_adapter.send_message([DfuTransportAnt.OP_CODE['Execute']])
self.__get_response(DfuTransportAnt.OP_CODE['Execute'])
def __select_command(self):
return self.__select_object(0x01)
def __select_data(self):
return self.__select_object(0x02)
def __select_object(self, object_type):
logger.debug("ANT: Selecting Object: type:{}".format(object_type))
self.dfu_adapter.send_message([DfuTransportAnt.OP_CODE['ReadObject'], object_type])
response = self.__get_response(DfuTransportAnt.OP_CODE['ReadObject'])
(max_size, offset, crc)= struct.unpack('<III', bytearray(response))
logger.debug("ANT: Object selected: " +
" max_size:{} offset:{} crc:{}".format(max_size, offset, crc))
return {'max_size': max_size, 'offset': offset, 'crc': crc}
def __get_checksum_response(self):
resp = self.__get_response(DfuTransportAnt.OP_CODE['CalcChecSum'])
(offset, crc) = struct.unpack('<II', bytearray(resp))
return {'offset': offset, 'crc': crc}
def __stream_data(self, data, crc=0, offset=0):
logger.debug("ANT: Streaming Data: " +
"len:{0} offset:{1} crc:0x{2:08X}".format(len(data), offset, crc))
def validate_crc():
if (crc != response['crc']):
raise ValidationException('Failed CRC validation.\n'\
+ 'Expected: {} Received: {}.'.format(crc, response['crc']))
if (offset != response['offset']):
raise ValidationException('Failed offset validation.\n'\
+ 'Expected: {} Received: {}.'.format(offset, response['offset']))
current_pnr = 0
for i in range(0, len(data), self.mtu - 4):
# append the write data opcode to the front
# here the maximum data size is self.mtu - 4
# due to the header bytes in commands.
to_transmit = data[i:i + self.mtu - 4 ]
to_transmit = struct.pack('B',DfuTransportAnt.OP_CODE['WriteObject']) + to_transmit
self.dfu_adapter.send_message(list(to_transmit))
crc = binascii.crc32(to_transmit[1:], crc) & 0xFFFFFFFF
offset += len(to_transmit) - 1
current_pnr += 1
if self.prn == current_pnr:
current_pnr = 0
response = self.__get_checksum_response()
validate_crc()
response = self.__calculate_checksum()
validate_crc()
return crc
def __get_response(self, operation):
def get_dict_key(dictionary, value):
return next((key for key, val in list(dictionary.items()) if val == value), None)
resp = self.dfu_adapter.get_message()
if resp is None:
return None
if resp[0] != DfuTransportAnt.OP_CODE['Response']:
raise NordicSemiException('No Response: 0x{:02X}'.format(resp[0]))
if resp[1] != operation:
raise NordicSemiException('Unexpected Executed OP_CODE.\n' \
+ 'Expected: 0x{:02X} Received: 0x{:02X}'.format(operation, resp[1]))
if resp[2] == DfuTransport.RES_CODE['Success']:
return resp[3:]
elif resp[2] == DfuTransport.RES_CODE['ExtendedError']:
try:
data = DfuTransport.EXT_ERROR_CODE[resp[3]]
except IndexError:
data = "Unsupported extended error type {}".format(resp[3])
raise NordicSemiException('Extended Error 0x{:02X}: {}'.format(resp[3], data))
else:
raise NordicSemiException('Response Code {}'.format(
get_dict_key(DfuTransport.RES_CODE, resp[2])))