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Merge pull request #93 from jdstroy/serial-interface-hack-for-wsl

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Add detection for WSL1 in SerialInterface
This commit is contained in:
Kevin Hester
2021-05-26 10:38:55 +08:00
committed by GitHub
parent c11e3dd844 88254ff0c1
commit 5972004dc0
1 changed files with 31 additions and 7 deletions
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38
meshtastic/__init__.py
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@@ -68,6 +68,8 @@ import base64
import platform
import socket
import timeago
import os
import stat
from . import mesh_pb2, portnums_pb2, apponly_pb2, admin_pb2, environmental_measurement_pb2, remote_hardware_pb2, channel_pb2, radioconfig_pb2, util
from .util import fixme, catchAndIgnore, stripnl, DeferredExecution, Timeout
from .node import Node
@@ -923,18 +925,40 @@ class SerialInterface(StreamInterface):
# rts=False Needed to prevent TBEAMs resetting on OSX, because rts is connected to reset
self.stream.port = devPath
# OS-X/Windows seems to have a bug in its serial driver. It ignores that we asked for no RTSCTS
# control and will always drive RTS either high or low (rather than letting the CP102 leave
# it as an open-collector floating pin). Since it is going to drive it anyways we want to make
# sure it is driven low, so that the TBEAM won't reset
# Linux does this properly, so don't apply this hack (because it makes the reset button not work)
if platform.system() != 'Linux':
# HACK: If the platform driving the serial port is unable to leave the RTS pin in high-impedance
# mode, set RTS to false so that the device platform won't be reset spuriously.
# Linux does this properly, so don't apply this hack on Linux (because it makes the reset button not work).
if self._hostPlatformAlwaysDrivesUartRts():
self.stream.rts = False
self.stream.open()
StreamInterface.__init__(
self, debugOut=debugOut, noProto=noProto, connectNow=connectNow)
"""true if platform driving the serial port is Windows Subsystem for Linux 1."""
def _isWsl1(self):
# WSL1 identifies itself as Linux, but has a special char device at /dev/lxss for use with session control,
# e.g. /init. We should treat WSL1 as Windows for the RTS-driving hack because the underlying platfrom
# serial driver for the CP21xx still exhibits the buggy behavior.
# WSL2 is not covered here, as it does not (as of 2021-May-25) support the appropriate functionality to
# share or pass-through serial ports.
try:
# Claims to be Linux, but has /dev/lxss; must be WSL 1
return platform.system() == 'Linux' and stat.S_ISCHR(os.stat('/dev/lxss').st_mode);
except:
# Couldn't stat /dev/lxss special device; not WSL1
return False;
def _hostPlatformAlwaysDrivesUartRts(self):
# OS-X/Windows seems to have a bug in its CP21xx serial drivers. It ignores that we asked for no RTSCTS
# control and will always drive RTS either high or low (rather than letting the CP102 leave
# it as an open-collector floating pin).
# TODO: When WSL2 supports USB passthrough, this will get messier. If/when WSL2 gets virtual serial
# ports that "share" the Windows serial port (and thus the Windows drivers), this code will need to be
# updated to reflect that as well -- or if T-Beams get made with an alternate USB to UART bridge that has
# a less buggy driver.
return platform.system() != 'Linux' or self._isWsl1();
class TCPInterface(StreamInterface):
"""Interface class for meshtastic devices over a TCP link"""