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Diffstat (limited to 'kvmd/bitbang.py')
| -rw-r--r-- | kvmd/bitbang.py | 34 |
1 files changed, 34 insertions, 0 deletions
diff --git a/kvmd/bitbang.py b/kvmd/bitbang.py new file mode 100644 index 00000000..0f4a202f --- /dev/null +++ b/kvmd/bitbang.py @@ -0,0 +1,34 @@ +# ========================================================================== # +# # +# KVMD - The main PiKVM daemon. # +# # +# Copyright (C) 2018-2023 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/>. # +# # +# ========================================================================== # + + +# ===== +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 |