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bitbang module

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This commit is contained in:
Maxim Devaev 2024-02-09 22:49:17 +02:00
parent 2149f497d4
commit 0b382c3d59
2 changed files with 38 additions and 16 deletions
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34
kvmd/bitbang.py Normal file
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@ -0,0 +1,34 @@
# ========================================================================== #
# #
# KVMD - The main PiKVM daemon. #
# #
# Copyright (C) 2018-2023 Maxim Devaev <mdevaev@gmail.com> #
# #
# 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/>. #
# #
# ========================================================================== #
# =====
def make_crc16(data: bytes) -> int:
crc = 0xFFFF
for byte in data:
crc = crc ^ byte
for _ in range(8):
if crc & 0x0001 == 0:
crc = crc >> 1
else:
crc = crc >> 1
crc = crc ^ 0xA001
return crc

20
kvmd/plugins/hid/_mcu/proto.py
View File

@ -28,6 +28,7 @@ from ....keyboard.mappings import KEYMAP
from ....mouse import MouseRange
from .... import tools
from .... import bitbang
# =====
@ -185,32 +186,19 @@ class MouseWheelEvent(BaseEvent):
# =====
def check_response(response: bytes) -> bool:
assert len(response) in (4, 8), response
return (_make_crc16(response[:-2]) == struct.unpack(">H", response[-2:])[0])
return (bitbang.make_crc16(response[:-2]) == struct.unpack(">H", response[-2:])[0])
def _make_request(command: bytes) -> bytes:
assert len(command) == 5, command
request = b"\x33" + command
request += struct.pack(">H", _make_crc16(request))
request += struct.pack(">H", bitbang.make_crc16(request))
assert len(request) == 8, request
return request
def _make_crc16(data: bytes) -> int:
crc = 0xFFFF
for byte in data:
crc = crc ^ byte
for _ in range(8):
if crc & 0x0001 == 0:
crc = crc >> 1
else:
crc = crc >> 1
crc = crc ^ 0xA001
return crc
# =====
REQUEST_PING = _make_request(b"\x01\x00\x00\x00\x00")
REQUEST_REPEAT = _make_request(b"\x02\x00\x00\x00\x00")
RESPONSE_LEGACY_OK = b"\x33\x20" + struct.pack(">H", _make_crc16(b"\x33\x20"))
RESPONSE_LEGACY_OK = b"\x33\x20" + struct.pack(">H", bitbang.make_crc16(b"\x33\x20"))