1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
|
# Copyright 2021-2022 Google LLC
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# https://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
# -----------------------------------------------------------------------------
# Imports
# -----------------------------------------------------------------------------
import asyncio
import logging
import serial_asyncio
from .common import Transport, StreamPacketSource, StreamPacketSink
# -----------------------------------------------------------------------------
# Logging
# -----------------------------------------------------------------------------
logger = logging.getLogger(__name__)
# -----------------------------------------------------------------------------
async def open_serial_transport(spec: str) -> Transport:
'''
Open a serial port transport.
The parameter string has this syntax:
<device-path>[,<speed>][,rtscts][,dsrdtr]
When <speed> is omitted, the default value of 1000000 is used
When "rtscts" is specified, RTS/CTS hardware flow control is enabled
When "dsrdtr" is specified, DSR/DTR hardware flow control is enabled
Examples:
/dev/tty.usbmodem0006839912172
/dev/tty.usbmodem0006839912172,1000000
/dev/tty.usbmodem0006839912172,rtscts
'''
speed = 1000000
rtscts = False
dsrdtr = False
if ',' in spec:
parts = spec.split(',')
device = parts[0]
for part in parts[1:]:
if part == 'rtscts':
rtscts = True
elif part == 'dsrdtr':
dsrdtr = True
elif part.isnumeric():
speed = int(part)
else:
device = spec
serial_transport, packet_source = await serial_asyncio.create_serial_connection(
asyncio.get_running_loop(),
StreamPacketSource,
device,
baudrate=speed,
rtscts=rtscts,
dsrdtr=dsrdtr,
)
packet_sink = StreamPacketSink(serial_transport)
return Transport(packet_source, packet_sink)
|
