You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
208 lines
7.3 KiB
208 lines
7.3 KiB
10 months ago
|
# MIT License
|
||
|
|
#
|
||
|
|
# Copyright (c) 2016-2022 Mark Qvist / unsigned.io
|
||
|
|
#
|
||
|
|
# Permission is hereby granted, free of charge, to any person obtaining a copy
|
||
|
|
# of this software and associated documentation files (the "Software"), to deal
|
||
|
|
# in the Software without restriction, including without limitation the rights
|
||
|
|
# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
|
||
|
|
# copies of the Software, and to permit persons to whom the Software is
|
||
|
|
# furnished to do so, subject to the following conditions:
|
||
|
|
#
|
||
|
|
# The above copyright notice and this permission notice shall be included in all
|
||
|
|
# copies or substantial portions of the Software.
|
||
|
|
#
|
||
|
|
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
|
||
|
|
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
|
||
|
|
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
|
||
|
|
# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
|
||
|
|
# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
|
||
|
|
# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
|
||
|
|
# SOFTWARE.
|
||
|
|
|
||
|
|
from .Interface import Interface
|
||
|
|
from time import sleep
|
||
|
|
import sys
|
||
|
|
import threading
|
||
|
|
import time
|
||
|
|
import RNS
|
||
|
|
|
||
|
|
class HDLC():
|
||
|
|
# The Serial Interface packetizes data using
|
||
|
|
# simplified HDLC framing, similar to PPP
|
||
|
|
FLAG = 0x7E
|
||
|
|
ESC = 0x7D
|
||
|
|
ESC_MASK = 0x20
|
||
|
|
|
||
|
|
@staticmethod
|
||
|
|
def escape(data):
|
||
|
|
data = data.replace(bytes([HDLC.ESC]), bytes([HDLC.ESC, HDLC.ESC^HDLC.ESC_MASK]))
|
||
|
|
data = data.replace(bytes([HDLC.FLAG]), bytes([HDLC.ESC, HDLC.FLAG^HDLC.ESC_MASK]))
|
||
|
|
return data
|
||
|
|
|
||
|
|
class SerialInterface(Interface):
|
||
|
|
MAX_CHUNK = 32768
|
||
|
|
|
||
|
|
owner = None
|
||
|
|
port = None
|
||
|
|
speed = None
|
||
|
|
databits = None
|
||
|
|
parity = None
|
||
|
|
stopbits = None
|
||
|
|
serial = None
|
||
|
|
|
||
|
|
def __init__(self, owner, name, port, speed, databits, parity, stopbits):
|
||
|
|
import importlib
|
||
|
|
if importlib.util.find_spec('serial') != None:
|
||
|
|
import serial
|
||
|
|
else:
|
||
|
|
RNS.log("Using the Serial interface requires a serial communication module to be installed.", RNS.LOG_CRITICAL)
|
||
|
|
RNS.log("You can install one with the command: python3 -m pip install pyserial", RNS.LOG_CRITICAL)
|
||
|
|
RNS.panic()
|
||
|
|
|
||
|
|
super().__init__()
|
||
|
|
|
||
|
|
self.HW_MTU = 564
|
||
|
|
|
||
|
|
self.pyserial = serial
|
||
|
|
self.serial = None
|
||
|
|
self.owner = owner
|
||
|
|
self.name = name
|
||
|
|
self.port = port
|
||
|
|
self.speed = speed
|
||
|
|
self.databits = databits
|
||
|
|
self.parity = serial.PARITY_NONE
|
||
|
|
self.stopbits = stopbits
|
||
|
|
self.timeout = 100
|
||
|
|
self.online = False
|
||
|
|
self.bitrate = self.speed
|
||
|
|
|
||
|
|
if parity.lower() == "e" or parity.lower() == "even":
|
||
|
|
self.parity = serial.PARITY_EVEN
|
||
|
|
|
||
|
|
if parity.lower() == "o" or parity.lower() == "odd":
|
||
|
|
self.parity = serial.PARITY_ODD
|
||
|
|
|
||
|
|
try:
|
||
|
|
self.open_port()
|
||
|
|
except Exception as e:
|
||
|
|
RNS.log("Could not open serial port for interface "+str(self), RNS.LOG_ERROR)
|
||
|
|
raise e
|
||
|
|
|
||
|
|
if self.serial.is_open:
|
||
|
|
self.configure_device()
|
||
|
|
else:
|
||
|
|
raise IOError("Could not open serial port")
|
||
|
|
|
||
|
|
|
||
|
|
def open_port(self):
|
||
|
|
RNS.log("Opening serial port "+self.port+"...", RNS.LOG_VERBOSE)
|
||
|
|
self.serial = self.pyserial.Serial(
|
||
|
|
port = self.port,
|
||
|
|
baudrate = self.speed,
|
||
|
|
bytesize = self.databits,
|
||
|
|
parity = self.parity,
|
||
|
|
stopbits = self.stopbits,
|
||
|
|
xonxoff = False,
|
||
|
|
rtscts = False,
|
||
|
|
timeout = 0,
|
||
|
|
inter_byte_timeout = None,
|
||
|
|
write_timeout = None,
|
||
|
|
dsrdtr = False,
|
||
|
|
)
|
||
|
|
|
||
|
|
|
||
|
|
def configure_device(self):
|
||
|
|
sleep(0.5)
|
||
|
|
thread = threading.Thread(target=self.readLoop)
|
||
|
|
thread.daemon = True
|
||
|
|
thread.start()
|
||
|
|
self.online = True
|
||
|
|
RNS.log("Serial port "+self.port+" is now open", RNS.LOG_VERBOSE)
|
||
|
|
|
||
|
|
|
||
|
|
def processIncoming(self, data):
|
||
|
|
self.rxb += len(data)
|
||
|
|
self.owner.inbound(data, self)
|
||
|
|
|
||
|
|
|
||
|
|
def processOutgoing(self,data):
|
||
|
|
if self.online:
|
||
|
|
data = bytes([HDLC.FLAG])+HDLC.escape(data)+bytes([HDLC.FLAG])
|
||
|
|
written = self.serial.write(data)
|
||
|
|
self.txb += len(data)
|
||
|
|
if written != len(data):
|
||
|
|
raise IOError("Serial interface only wrote "+str(written)+" bytes of "+str(len(data)))
|
||
|
|
|
||
|
|
|
||
|
|
def readLoop(self):
|
||
|
|
try:
|
||
|
|
in_frame = False
|
||
|
|
escape = False
|
||
|
|
data_buffer = b""
|
||
|
|
last_read_ms = int(time.time()*1000)
|
||
|
|
|
||
|
|
while self.serial.is_open:
|
||
|
|
if self.serial.in_waiting:
|
||
|
|
byte = ord(self.serial.read(1))
|
||
|
|
last_read_ms = int(time.time()*1000)
|
||
|
|
|
||
|
|
if (in_frame and byte == HDLC.FLAG):
|
||
|
|
in_frame = False
|
||
|
|
self.processIncoming(data_buffer)
|
||
|
|
elif (byte == HDLC.FLAG):
|
||
|
|
in_frame = True
|
||
|
|
data_buffer = b""
|
||
|
|
elif (in_frame and len(data_buffer) < self.HW_MTU):
|
||
|
|
if (byte == HDLC.ESC):
|
||
|
|
escape = True
|
||
|
|
else:
|
||
|
|
if (escape):
|
||
|
|
if (byte == HDLC.FLAG ^ HDLC.ESC_MASK):
|
||
|
|
byte = HDLC.FLAG
|
||
|
|
if (byte == HDLC.ESC ^ HDLC.ESC_MASK):
|
||
|
|
byte = HDLC.ESC
|
||
|
|
escape = False
|
||
|
|
data_buffer = data_buffer+bytes([byte])
|
||
|
|
|
||
|
|
else:
|
||
|
|
time_since_last = int(time.time()*1000) - last_read_ms
|
||
|
|
if len(data_buffer) > 0 and time_since_last > self.timeout:
|
||
|
|
data_buffer = b""
|
||
|
|
in_frame = False
|
||
|
|
escape = False
|
||
|
|
sleep(0.08)
|
||
|
|
|
||
|
|
except Exception as e:
|
||
|
|
self.online = False
|
||
|
|
RNS.log("A serial port error occurred, the contained exception was: "+str(e), RNS.LOG_ERROR)
|
||
|
|
RNS.log("The interface "+str(self)+" experienced an unrecoverable error and is now offline.", RNS.LOG_ERROR)
|
||
|
|
|
||
|
|
if RNS.Reticulum.panic_on_interface_error:
|
||
|
|
RNS.panic()
|
||
|
|
|
||
|
|
RNS.log("Reticulum will attempt to reconnect the interface periodically.", RNS.LOG_ERROR)
|
||
|
|
|
||
|
|
self.online = False
|
||
|
|
self.serial.close()
|
||
|
|
self.reconnect_port()
|
||
|
|
|
||
|
|
def reconnect_port(self):
|
||
|
|
while not self.online:
|
||
|
|
try:
|
||
|
|
time.sleep(5)
|
||
|
|
RNS.log("Attempting to reconnect serial port "+str(self.port)+" for "+str(self)+"...", RNS.LOG_VERBOSE)
|
||
|
|
self.open_port()
|
||
|
|
if self.serial.is_open:
|
||
|
|
self.configure_device()
|
||
|
|
except Exception as e:
|
||
|
|
RNS.log("Error while reconnecting port, the contained exception was: "+str(e), RNS.LOG_ERROR)
|
||
|
|
|
||
|
|
RNS.log("Reconnected serial port for "+str(self))
|
||
|
|
|
||
|
|
def should_ingress_limit(self):
|
||
|
|
return False
|
||
|
|
|
||
|
|
def __str__(self):
|
||
|
|
return "SerialInterface["+self.name+"]"
|