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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/>. #
# #
*****************************************************************************/
#if !(defined(CMD_SERIAL) || defined(CMD_SPI))
# error CMD phy is not defined
#endif
#include <Arduino.h>
#ifdef CMD_SPI
# include <SPI.h>
#endif
#include "proto.h"
#if defined(HID_USB_KBD) || defined(HID_USB_MOUSE)
# include "usb/hid.h"
#endif
#ifdef HID_PS2_KBD
# include "ps2/hid.h"
#endif
// #define CMD_SERIAL Serial1
// #define CMD_SERIAL_SPEED 115200
// #define CMD_SERIAL_TIMEOUT 100000
// -- OR --
// #define CMD_SPI
// -----------------------------------------------------------------------------
#ifdef HID_USB_KBD
UsbHidKeyboard hid_kbd;
#elif defined(HID_PS2_KBD)
Ps2HidKeyboard hid_kbd;
#endif
#ifdef HID_USB_MOUSE
UsbHidMouse hid_mouse;
#endif
// -----------------------------------------------------------------------------
uint8_t cmdResetHid(const uint8_t *buffer) { // 0 bytes
# ifdef HID_USB_KBD
hid_kbd.reset();
# endif
# ifdef HID_USB_MOUSE
hid_mouse.reset();
# endif
return PROTO_RESP_OK;
}
uint8_t cmdKeyEvent(const uint8_t *buffer) { // 2 bytes
hid_kbd.sendKey(buffer[0], buffer[1]);
return PROTO_RESP_OK;
}
uint8_t cmdMouseButtonEvent(const uint8_t *buffer) { // 2 bytes
# ifdef HID_USB_MOUSE
uint8_t main_state = buffer[0];
uint8_t extra_state = buffer[1];
# define MOUSE_PAIR(_state, _button) \
_state & PROTO_CMD_MOUSE_BUTTON_##_button##_SELECT, \
_state & PROTO_CMD_MOUSE_BUTTON_##_button##_STATE
hid_mouse.sendButtons(
MOUSE_PAIR(main_state, LEFT),
MOUSE_PAIR(main_state, RIGHT),
MOUSE_PAIR(main_state, MIDDLE),
MOUSE_PAIR(extra_state, EXTRA_UP),
MOUSE_PAIR(extra_state, EXTRA_DOWN)
);
# undef MOUSE_PAIR
# endif
return PROTO_RESP_OK;
}
uint8_t cmdMouseMoveEvent(const uint8_t *buffer) { // 4 bytes
# ifdef HID_USB_MOUSE
int x = (int)buffer[0] << 8;
x |= (int)buffer[1];
x = (x + 32768) / 2; // See /kvmd/apps/otg/hid/keyboard.py for details
int y = (int)buffer[2] << 8;
y |= (int)buffer[3];
y = (y + 32768) / 2; // See /kvmd/apps/otg/hid/keyboard.py for details
hid_mouse.sendMove(x, y);
# endif
return PROTO_RESP_OK;
}
uint8_t cmdMouseWheelEvent(const uint8_t *buffer) { // 2 bytes
# ifdef HID_USB_MOUSE
hid_mouse.sendWheel(buffer[1]); // Y only, X is not supported
# endif
return PROTO_RESP_OK;
}
uint8_t cmdPongLeds(const uint8_t *buffer) { // 0 bytes
return ((uint8_t) PROTO_RESP_PONG_PREFIX) | hid_kbd.getLedsAs(
PROTO_RESP_PONG_CAPS,
PROTO_RESP_PONG_SCROLL,
PROTO_RESP_PONG_NUM
);
}
uint8_t handleCmdBuffer(const uint8_t *buffer) { // 8 bytes
uint16_t crc = (uint16_t)buffer[6] << 8;
crc |= (uint16_t)buffer[7];
if (protoCrc16(buffer, 6) == crc) {
# define HANDLE(_handler) { return _handler(buffer + 2); }
switch (buffer[1]) {
case PROTO_CMD_RESET_HID: HANDLE(cmdResetHid);
case PROTO_CMD_KEY_EVENT: HANDLE(cmdKeyEvent);
case PROTO_CMD_MOUSE_BUTTON_EVENT: HANDLE(cmdMouseButtonEvent);
case PROTO_CMD_MOUSE_MOVE_EVENT: HANDLE(cmdMouseMoveEvent);
case PROTO_CMD_MOUSE_WHEEL_EVENT: HANDLE(cmdMouseWheelEvent);
case PROTO_CMD_PING: HANDLE(cmdPongLeds);
case PROTO_CMD_REPEAT: return 0;
default: return PROTO_RESP_INVALID_ERROR;
}
# undef HANDLE
}
return PROTO_RESP_CRC_ERROR;
}
// -----------------------------------------------------------------------------
#ifdef CMD_SPI
volatile uint8_t spi_in[8] = {0};
volatile uint8_t spi_in_index = 0;
volatile uint8_t spi_out[4] = {0};
volatile uint8_t spi_out_index = 0;
bool spiReady() {
return (!spi_out[0] && spi_in_index == 8);
}
void spiWrite(const uint8_t *buffer) {
spi_out[3] = buffer[3];
spi_out[2] = buffer[2];
spi_out[1] = buffer[1];
spi_out[0] = buffer[0]; // Меджик разрешает начать ответ
}
ISR(SPI_STC_vect) {
uint8_t in = SPDR;
if (spi_out[0] && spi_out_index < 4) {
SPDR = spi_out[spi_out_index];
if (!(SPSR & (1 << WCOL))) {
++spi_out_index;
if (spi_out_index == 4) {
spi_out_index = 0;
spi_in_index = 0;
spi_out[0] = 0;
}
}
} else {
static bool receiving = false;
if (!receiving && in == PROTO_MAGIC) {
receiving = true;
}
if (receiving && spi_in_index < 8) {
spi_in[spi_in_index] = in;
++spi_in_index;
}
if (spi_in_index == 8) {
receiving = false;
}
SPDR = 0;
}
}
#endif
// -----------------------------------------------------------------------------
void sendCmdResponse(uint8_t code) {
static uint8_t prev_code = PROTO_RESP_NONE;
if (code == 0) {
code = prev_code; // Repeat the last code
} else {
prev_code = code;
}
uint8_t buffer[4];
buffer[0] = PROTO_MAGIC;
buffer[1] = code;
uint16_t crc = protoCrc16(buffer, 2);
buffer[2] = (uint8_t)(crc >> 8);
buffer[3] = (uint8_t)(crc & 0xFF);
# ifdef CMD_SERIAL
CMD_SERIAL.write(buffer, 4);
# elif defined(CMD_SPI)
spiWrite(buffer);
# endif
}
void setup() {
hid_kbd.begin();
# ifdef HID_USB_MOUSE
hid_mouse.begin();
# endif
# ifdef CMD_SERIAL
CMD_SERIAL.begin(CMD_SERIAL_SPEED);
# elif defined(CMD_SPI)
pinMode(MISO, OUTPUT);
SPCR = (1 << SPE) | (1 << SPIE); // Slave, SPI En, IRQ En
# endif
}
void loop() {
# ifdef CMD_SERIAL
unsigned long last = micros();
uint8_t buffer[8];
uint8_t index = 0;
# endif
while (true) {
# ifdef HID_PS2_KBD
hid_kbd.periodic();
# endif
# ifdef CMD_SERIAL
if (CMD_SERIAL.available() > 0) {
buffer[index] = (uint8_t)CMD_SERIAL.read();
if (index == 7) {
sendCmdResponse(handleCmdBuffer(buffer));
index = 0;
} else {
last = micros();
++index;
}
} else if (index > 0) {
unsigned long now = micros();
if (
(now >= last && now - last > CMD_SERIAL_TIMEOUT)
|| (now < last && ((unsigned long)-1) - last + now > CMD_SERIAL_TIMEOUT)
) {
sendCmdResponse(PROTO_RESP_TIMEOUT_ERROR);
index = 0;
}
}
# elif defined(CMD_SPI)
if (spiReady()) {
sendCmdResponse(handleCmdBuffer(spi_in));
}
# endif
}
}
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