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# Copyright 2020 The ChromiumOS Authors
# Use of this source code is governed by a BSD-style license that can be
# found in the LICENSE file.
"""Helper class to facilitate communication to servo ec console."""
from ecusb import pty_driver, stm32uart
class TinyServod(object):
"""Helper class to wrap a pty_driver with interface."""
def __init__(self, vid, pid, interface, serialname=None, debug=False):
"""Build the driver and interface.
Args:
vid: servo device vid
pid: servo device pid
interface: which usb interface the servo console is on
serialname: the servo device serial (if available)
"""
self._vid = vid
self._pid = pid
self._interface = interface
self._serial = serialname
self._debug = debug
self._init()
def _init(self):
self.suart = stm32uart.Suart(
vendor=self._vid,
product=self._pid,
interface=self._interface,
serialname=self._serial,
debuglog=self._debug,
)
self.suart.run()
self.pty = pty_driver.ptyDriver(self.suart, [])
def reinitialize(self):
"""Reinitialize the connect after a reset/disconnect/etc."""
self.close()
self._init()
def close(self):
"""Close out the connection and release resources.
Note: if another TinyServod process or servod itself needs the same device
it's necessary to call this to ensure the usb device is available.
"""
self.suart.close()
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