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67 lines
2.5 KiB
Python
67 lines
2.5 KiB
Python
""" Serial interface class
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"""
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import logging
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import time
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import platform
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import serial
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import meshtastic.util
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from meshtastic.stream_interface import StreamInterface
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if platform.system() != 'Windows':
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import termios
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class SerialInterface(StreamInterface):
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"""Interface class for meshtastic devices over a serial link"""
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def __init__(self, devPath=None, debugOut=None, noProto=False, connectNow=True):
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"""Constructor, opens a connection to a specified serial port, or if unspecified try to
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find one Meshtastic device by probing
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Keyword Arguments:
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devPath {string} -- A filepath to a device, i.e. /dev/ttyUSB0 (default: {None})
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debugOut {stream} -- If a stream is provided, any debug serial output from the device will be emitted to that stream. (default: {None})
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"""
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self.noProto = noProto
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self.devPath = devPath
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if self.devPath is None:
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ports = meshtastic.util.findPorts(True)
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logging.debug(f"ports:{ports}")
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if len(ports) == 0:
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meshtastic.util.our_exit("Warning: No Meshtastic devices detected.")
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elif len(ports) > 1:
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message = "Warning: Multiple serial ports were detected so one serial port must be specified with the '--port'.\n"
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message += f" Ports detected:{ports}"
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meshtastic.util.our_exit(message)
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else:
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self.devPath = ports[0]
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logging.debug(f"Connecting to {self.devPath}")
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# first we need to set the HUPCL so the device will not reboot based on RTS and/or DTR
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# see https://github.com/pyserial/pyserial/issues/124
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if platform.system() != 'Windows':
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with open(self.devPath, encoding='utf8') as f:
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attrs = termios.tcgetattr(f)
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attrs[2] = attrs[2] & ~termios.HUPCL
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termios.tcsetattr(f, termios.TCSAFLUSH, attrs)
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f.close()
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time.sleep(0.1)
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self.stream = serial.Serial(self.devPath, 115200, exclusive=True, timeout=0.5, write_timeout=0)
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self.stream.flush()
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time.sleep(0.1)
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StreamInterface.__init__(self, debugOut=debugOut, noProto=noProto, connectNow=connectNow)
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def close(self):
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"""Close a connection to the device"""
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self.stream.flush()
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time.sleep(0.1)
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self.stream.flush()
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time.sleep(0.1)
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logging.debug("Closing Serial stream")
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StreamInterface.close(self)
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