mirror of
https://github.com/ARM-software/workload-automation.git
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112 lines
3.7 KiB
Python
112 lines
3.7 KiB
Python
# Copyright 2013-2015 ARM Limited
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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#
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import time
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from contextlib import contextmanager
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import serial
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import fdpexpect
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# Adding pexpect exceptions into this module's namespace
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from pexpect import EOF, TIMEOUT # NOQA pylint: disable=W0611
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from wlauto.exceptions import HostError
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from wlauto.utils.log import LogWriter
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class PexpectLogger(LogWriter):
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def __init__(self, kind):
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"""
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File-like object class designed to be used for logging with pexpect or
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fdpexect. Each complete line (terminated by new line character) gets logged
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at DEBUG level. In complete lines are buffered until the next new line.
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:param kind: This specified which of pexpect logfile attributes this logger
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will be set to. It should be "read" for logfile_read, "send" for
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logfile_send, and "" (emtpy string) for logfile.
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"""
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if kind not in ('read', 'send', ''):
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raise ValueError('kind must be "read", "send" or ""; got {}'.format(kind))
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self.kind = kind
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logger_name = 'serial_{}'.format(kind) if kind else 'serial'
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super(PexpectLogger, self).__init__(logger_name)
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def pulse_dtr(conn, state=True, duration=0.1):
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"""Set the DTR line of the specified serial connection to the specified state
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for the specified duration (note: the initial state of the line is *not* checked."""
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conn.setDTR(state)
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time.sleep(duration)
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conn.setDTR(not state)
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@contextmanager
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def open_serial_connection(timeout, get_conn=False, init_dtr=None, *args, **kwargs):
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"""
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Opens a serial connection to a device.
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:param timeout: timeout for the fdpexpect spawn object.
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:param conn: ``bool`` that specfies whether the underlying connection
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object should be yielded as well.
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:param init_dtr: specifies the initial DTR state stat should be set.
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All arguments are passed into the __init__ of serial.Serial. See
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pyserial documentation for details:
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http://pyserial.sourceforge.net/pyserial_api.html#serial.Serial
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:returns: a pexpect spawn object connected to the device.
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See: http://pexpect.sourceforge.net/pexpect.html
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"""
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if init_dtr is not None:
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kwargs['dsrdtr'] = True
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try:
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conn = serial.Serial(*args, **kwargs)
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except serial.SerialException as e:
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raise HostError(e.message)
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if init_dtr is not None:
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conn.setDTR(init_dtr)
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conn.nonblocking()
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conn.flushOutput()
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target = fdpexpect.fdspawn(conn.fileno(), timeout=timeout)
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target.logfile_read = PexpectLogger('read')
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target.logfile_send = PexpectLogger('send')
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# Monkey-patching sendline to introduce a short delay after
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# chacters are sent to the serial. If two sendline s are issued
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# one after another the second one might start putting characters
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# into the serial device before the first one has finished, causing
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# corruption. The delay prevents that.
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tsln = target.sendline
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def sendline(x):
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tsln(x)
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time.sleep(0.1)
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target.sendline = sendline
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if get_conn:
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yield target, conn
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else:
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yield target
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target.close() # Closes the file descriptor used by the conn.
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del conn
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