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
|
# ========================================================================== #
# #
# KVMD - The main PiKVM daemon. #
# #
# Copyright (C) 2018-2022 Maxim Devaev <[email protected]> #
# #
# This program is free software: you can redistribute it and/or modify #
# it under the terms of the GNU General Public License as published by #
# the Free Software Foundation, either version 3 of the License, or #
# (at your option) any later version. #
# #
# This program is distributed in the hope that it will be useful, #
# but WITHOUT ANY WARRANTY; without even the implied warranty of #
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the #
# GNU General Public License for more details. #
# #
# You should have received a copy of the GNU General Public License #
# along with this program. If not, see <https://www.gnu.org/licenses/>. #
# #
# ========================================================================== #
import os
import serial
class TTY:
def __init__(self, device_path: str, speed: int, read_timeout: float) -> None:
self.__tty = serial.Serial(device_path, speed, timeout=read_timeout)
self.__device_path = device_path
def has_device(self) -> bool:
return os.path.exists(self.__device_path)
def send(self, cmd: list[int]) -> list[int]:
cmd = self.__wrap_cmd(cmd)
self.__tty.write(serial.to_bytes(cmd))
data = list(self.__tty.read(5))
if data and data[4]:
more_data = list(self.__tty.read(data[4] + 1))
data.extend(more_data)
return data
def check_res(self, res: list[int]) -> bool:
res_sum = res.pop()
return (self.__checksum(res) == res_sum)
def __wrap_cmd(self, cmd: list[int]) -> list[int]:
cmd.insert(0, 0xAB)
cmd.insert(0, 0x57)
cmd.append(self.__checksum(cmd))
return cmd
def __checksum(self, cmd: list[int]) -> int:
return sum(cmd) % 256
def get_info() -> list[int]:
return [0x00, 0x01, 0x00]
# RESET = [0x00,0x0F,0x00]
# GET_INFO = [0x00,0x01,0x00]
|
