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/*****************************************************************************
# #
# KVMD - The main Pi-KVM daemon. #
# #
# Copyright (C) 2018 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/>. #
# #
*****************************************************************************/
#pragma once
#define PROTO_MAGIC 0x33
#define PROTO_CRC_POLINOM 0xA001
#define PROTO_RESP_OK 0x20
#define PROTO_RESP_NONE 0x24
#define PROTO_RESP_CRC_ERROR 0x40
#define PROTO_RESP_INVALID_ERROR 0x45
#define PROTO_RESP_TIMEOUT_ERROR 0x48
#define PROTO_RESP_PONG_PREFIX 0x80
#define PROTO_RESP_PONG_CAPS 0b00000001
#define PROTO_RESP_PONG_SCROLL 0b00000010
#define PROTO_RESP_PONG_NUM 0b00000100
#define PROTO_CMD_PING 0x01
#define PROTO_CMD_REPEAT 0x02
#define PROTO_CMD_RESET_HID 0x10
#define PROTO_CMD_KEY_EVENT 0x11
#define PROTO_CMD_MOUSE_BUTTON_EVENT 0x13 // Legacy sequence
#define PROTO_CMD_MOUSE_MOVE_EVENT 0x12
#define PROTO_CMD_MOUSE_WHEEL_EVENT 0x14
#define PROTO_CMD_MOUSE_BUTTON_LEFT_SELECT 0b10000000
#define PROTO_CMD_MOUSE_BUTTON_LEFT_STATE 0b00001000
#define PROTO_CMD_MOUSE_BUTTON_RIGHT_SELECT 0b01000000
#define PROTO_CMD_MOUSE_BUTTON_RIGHT_STATE 0b00000100
#define PROTO_CMD_MOUSE_BUTTON_MIDDLE_SELECT 0b00100000
#define PROTO_CMD_MOUSE_BUTTON_MIDDLE_STATE 0b00000010
#define PROTO_CMD_MOUSE_BUTTON_EXTRA_UP_SELECT 0b10000000
#define PROTO_CMD_MOUSE_BUTTON_EXTRA_UP_STATE 0b00001000
#define PROTO_CMD_MOUSE_BUTTON_EXTRA_DOWN_SELECT 0b01000000
#define PROTO_CMD_MOUSE_BUTTON_EXTRA_DOWN_STATE 0b00000100
uint16_t protoCrc16(const uint8_t *buffer, unsigned length) {
uint16_t crc = 0xFFFF;
for (unsigned byte_count = 0; byte_count < length; ++byte_count) {
crc = crc ^ buffer[byte_count];
for (unsigned bit_count = 0; bit_count < 8; ++bit_count) {
if ((crc & 0x0001) == 0) {
crc = crc >> 1;
} else {
crc = crc >> 1;
crc = crc ^ PROTO_CRC_POLINOM;
}
}
}
return crc;
}
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