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https://github.com/ARM-software/devlib.git
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trace/serial_trace: Add capability to trace serial traffic
We add a TraceCollector which logs the traffic on a serial port. This can then be used to debug why a board crashes, or to extract extra information from the device whilst it is running a workload.
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parent
c4f6a1a85f
commit
6abe6067da
devlib
@ -25,6 +25,7 @@ from devlib.derived.energy import DerivedEnergyMeasurements
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from devlib.derived.fps import DerivedGfxInfoStats, DerivedSurfaceFlingerStats
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from devlib.trace.ftrace import FtraceCollector
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from devlib.trace.serial_trace import SerialTraceCollector
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from devlib.host import LocalConnection
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from devlib.utils.android import AdbConnection
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75
devlib/trace/serial_trace.py
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75
devlib/trace/serial_trace.py
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@ -0,0 +1,75 @@
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from pexpect.exceptions import TIMEOUT
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import shutil
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from tempfile import NamedTemporaryFile
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from devlib.trace import TraceCollector
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from devlib.utils.serial_port import get_connection
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class SerialTraceCollector(TraceCollector):
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@property
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def collecting(self):
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return self._collecting
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def __init__(self, target, serial_port, baudrate, timeout=20):
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super(SerialTraceCollector, self).__init__(target)
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self.serial_port = serial_port
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self.baudrate = baudrate
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self.timeout = timeout
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self._serial_target = None
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self._conn = None
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self._tmpfile = None
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self._collecting = False
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def reset(self):
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if self._collecting:
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raise RuntimeError("reset was called whilst collecting")
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if self._tmpfile:
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self._tmpfile.close()
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self._tmpfile = None
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def start(self):
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if self._collecting:
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raise RuntimeError("start was called whilst collecting")
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self._tmpfile = NamedTemporaryFile()
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self._tmpfile.write("-------- Starting serial logging --------\n")
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self._serial_target, self._conn = get_connection(port=self.serial_port,
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baudrate=self.baudrate,
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timeout=self.timeout,
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logfile=self._tmpfile,
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init_dtr=0)
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self._collecting = True
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def stop(self):
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if not self._collecting:
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raise RuntimeError("stop was called whilst not collecting")
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# We expect the below to fail, but we need to get pexpect to
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# do something so that it interacts with the serial device,
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# and hence updates the logfile.
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try:
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self._serial_target.expect(".", timeout=1)
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except TIMEOUT:
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pass
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self._serial_target.close()
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del self._conn
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self._tmpfile.write("-------- Stopping serial logging --------\n")
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self._collecting = False
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def get_trace(self, outfile):
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if self._collecting:
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raise RuntimeError("get_trace was called whilst collecting")
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shutil.copy(self._tmpfile.name, outfile)
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self._tmpfile.close()
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self._tmpfile = None
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@ -49,7 +49,7 @@ def pulse_dtr(conn, state=True, duration=0.1):
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def get_connection(timeout, init_dtr=None, logcls=SerialLogger,
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*args, **kwargs):
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logfile=None, *args, **kwargs):
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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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@ -60,7 +60,7 @@ def get_connection(timeout, init_dtr=None, logcls=SerialLogger,
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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 = fdpexpect.fdspawn(conn.fileno(), timeout=timeout, logfile=logfile)
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target.logfile_read = logcls('read')
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target.logfile_send = logcls('send')
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