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mirror of https://github.com/ARM-software/devlib.git synced 2025-02-28 07:27:50 +00:00

100 lines
3.4 KiB
Python

# Copyright 2018 ARM Limited
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
#
import shutil
from tempfile import NamedTemporaryFile
from pexpect.exceptions import TIMEOUT
from devlib.collector import (CollectorBase, CollectorOutput,
CollectorOutputEntry)
from devlib.utils.serial_port import get_connection
class SerialTraceCollector(CollectorBase):
@property
def collecting(self):
return self._collecting
def __init__(self, target, serial_port, baudrate, timeout=20):
super(SerialTraceCollector, self).__init__(target)
self.serial_port = serial_port
self.baudrate = baudrate
self.timeout = timeout
self.output_path = None
self._serial_target = None
self._conn = None
self._outfile_fh = None
self._collecting = False
def reset(self):
if self._collecting:
raise RuntimeError("reset was called whilst collecting")
if self._outfile_fh:
self._outfile_fh.close()
self._outfile_fh = None
def start(self):
if self._collecting:
raise RuntimeError("start was called whilst collecting")
if self.output_path is None:
raise RuntimeError("Output path was not set.")
self._outfile_fh = open(self.output_path, 'wb')
start_marker = "-------- Starting serial logging --------\n"
self._outfile_fh.write(start_marker.encode('utf-8'))
self._serial_target, self._conn = get_connection(port=self.serial_port,
baudrate=self.baudrate,
timeout=self.timeout,
logfile=self._outfile_fh,
init_dtr=0)
self._collecting = True
def stop(self):
if not self._collecting:
raise RuntimeError("stop was called whilst not collecting")
# We expect the below to fail, but we need to get pexpect to
# do something so that it interacts with the serial device,
# and hence updates the logfile.
try:
self._serial_target.expect(".", timeout=1)
except TIMEOUT:
pass
self._serial_target.close()
del self._conn
stop_marker = "-------- Stopping serial logging --------\n"
self._outfile_fh.write(stop_marker.encode('utf-8'))
self._outfile_fh.flush()
self._outfile_fh.close()
self._outfile_fh = None
self._collecting = False
def set_output(self, output_path):
self.output_path = output_path
def get_data(self):
if self._collecting:
raise RuntimeError("get_data was called whilst collecting")
if self.output_path is None:
raise RuntimeError("No data collected.")
return CollectorOutput([CollectorOutputEntry(self.output_path, 'file')])