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/* Copyright 2021 QMK
*
* 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 <http://www.gnu.org/licenses/>.
*/
#include "split_util.h"
#include "matrix.h"
#include "keyboard.h"
#include "config.h"
#include "timer.h"
#include "transport.h"
#include "quantum.h"
#include "wait.h"
#include "usb_util.h"
#ifdef EE_HANDS
# include "eeconfig.h"
#endif
#if defined(RGBLIGHT_ENABLE) && defined(RGBLED_SPLIT)
# include "rgblight.h"
#endif
#ifndef SPLIT_USB_TIMEOUT
# define SPLIT_USB_TIMEOUT 2000
#endif
#ifndef SPLIT_USB_TIMEOUT_POLL
# define SPLIT_USB_TIMEOUT_POLL 10
#endif
// Max number of consecutive failed communications (one per scan cycle) before the communication is seen as disconnected.
// Set to 0 to disable the disconnection check altogether.
#ifndef SPLIT_MAX_CONNECTION_ERRORS
# define SPLIT_MAX_CONNECTION_ERRORS 10
#endif // SPLIT_MAX_CONNECTION_ERRORS
// How long (in milliseconds) to block all connection attempts after the communication has been flagged as disconnected.
// One communication attempt will be allowed everytime this amount of time has passed since the last attempt. If that attempt succeeds, the communication is seen as working again.
// Set to 0 to disable communication throttling while disconnected
#ifndef SPLIT_CONNECTION_CHECK_TIMEOUT
# define SPLIT_CONNECTION_CHECK_TIMEOUT 500
#endif // SPLIT_CONNECTION_CHECK_TIMEOUT
static uint8_t connection_errors = 0;
volatile bool isLeftHand = true;
#if defined(SPLIT_USB_DETECT)
_Static_assert((SPLIT_USB_TIMEOUT / SPLIT_USB_TIMEOUT_POLL) <= UINT16_MAX, "Please lower SPLIT_USB_TIMEOUT and/or increase SPLIT_USB_TIMEOUT_POLL.");
static bool usbIsActive(void) {
for (uint16_t i = 0; i < (SPLIT_USB_TIMEOUT / SPLIT_USB_TIMEOUT_POLL); i++) {
// This will return true if a USB connection has been established
if (usb_connected_state()) {
return true;
}
wait_ms(SPLIT_USB_TIMEOUT_POLL);
}
return false;
}
#else
static inline bool usbIsActive(void) {
return usb_vbus_state();
}
#endif
#ifdef SPLIT_HAND_MATRIX_GRID
void matrix_io_delay(void);
static uint8_t peek_matrix_intersection(pin_t out_pin, pin_t in_pin) {
setPinInputHigh(in_pin);
setPinOutput(out_pin);
writePinLow(out_pin);
// It's almost unnecessary, but wait until it's down to low, just in case.
wait_us(1);
uint8_t pin_state = readPin(in_pin);
// Set out_pin to a setting that is less susceptible to noise.
setPinInputHigh(out_pin);
matrix_io_delay(); // Wait for the pull-up to go HIGH.
return pin_state;
}
#endif
__attribute__((weak)) bool is_keyboard_left(void) {
#if defined(SPLIT_HAND_PIN)
// Test pin SPLIT_HAND_PIN for High/Low, if low it's right hand
# ifdef SPLIT_HAND_PIN_LOW_IS_LEFT
return !readPin(SPLIT_HAND_PIN);
# else
return readPin(SPLIT_HAND_PIN);
# endif
#elif defined(SPLIT_HAND_MATRIX_GRID)
# ifdef SPLIT_HAND_MATRIX_GRID_LOW_IS_RIGHT
return peek_matrix_intersection(SPLIT_HAND_MATRIX_GRID);
# else
return !peek_matrix_intersection(SPLIT_HAND_MATRIX_GRID);
# endif
#elif defined(EE_HANDS)
return eeconfig_read_handedness();
#elif defined(MASTER_RIGHT)
return !is_keyboard_master();
#endif
return is_keyboard_master();
}
__attribute__((weak)) bool is_keyboard_master(void) {
static enum { UNKNOWN, MASTER, SLAVE } usbstate = UNKNOWN;
// only check once, as this is called often
if (usbstate == UNKNOWN) {
usbstate = usbIsActive() ? MASTER : SLAVE;
// Avoid NO_USB_STARTUP_CHECK - Disable USB as the previous checks seem to enable it somehow
if (usbstate == SLAVE) {
usb_disconnect();
}
}
return (usbstate == MASTER);
}
// this code runs before the keyboard is fully initialized
void split_pre_init(void) {
#if defined(SPLIT_HAND_PIN)
setPinInput(SPLIT_HAND_PIN);
wait_us(100);
#elif defined(EE_HANDS)
if (!eeconfig_is_enabled()) {
eeconfig_init();
}
#endif
isLeftHand = is_keyboard_left();
#if defined(RGBLIGHT_ENABLE) && defined(RGBLED_SPLIT)
uint8_t num_rgb_leds_split[2] = RGBLED_SPLIT;
if (isLeftHand) {
rgblight_set_clipping_range(0, num_rgb_leds_split[0]);
} else {
rgblight_set_clipping_range(num_rgb_leds_split[0], num_rgb_leds_split[1]);
}
#endif
if (is_keyboard_master()) {
#if defined(USE_I2C) && defined(SSD1306OLED)
matrix_master_OLED_init();
#endif
transport_master_init();
}
}
// this code runs after the keyboard is fully initialized
// - avoids race condition during matrix_init_quantum where slave can start
// receiving before the init process has completed
void split_post_init(void) {
if (!is_keyboard_master()) {
transport_slave_init();
}
}
bool is_transport_connected(void) {
return connection_errors < SPLIT_MAX_CONNECTION_ERRORS;
}
bool transport_master_if_connected(matrix_row_t master_matrix[], matrix_row_t slave_matrix[]) {
#if SPLIT_MAX_CONNECTION_ERRORS > 0 && SPLIT_CONNECTION_CHECK_TIMEOUT > 0
// Throttle transaction attempts if target doesn't seem to be connected
// Without this, a solo half becomes unusable due to constant read timeouts
static uint16_t connection_check_timer = 0;
const bool is_disconnected = !is_transport_connected();
if (is_disconnected && timer_elapsed(connection_check_timer) < SPLIT_CONNECTION_CHECK_TIMEOUT) {
return false;
}
#endif // SPLIT_MAX_CONNECTION_ERRORS > 0 && SPLIT_CONNECTION_CHECK_TIMEOUT > 0
__attribute__((unused)) bool okay = transport_master(master_matrix, slave_matrix);
#if SPLIT_MAX_CONNECTION_ERRORS > 0
if (!okay) {
if (connection_errors < UINT8_MAX) {
connection_errors++;
}
# if SPLIT_CONNECTION_CHECK_TIMEOUT > 0
bool connected = is_transport_connected();
if (!connected) {
connection_check_timer = timer_read();
dprintln("Target disconnected, throttling connection attempts");
}
return connected;
} else if (is_disconnected) {
dprintln("Target connected");
# endif // SPLIT_CONNECTION_CHECK_TIMEOUT > 0
}
connection_errors = 0;
#endif // SPLIT_MAX_CONNECTION_ERRORS > 0
return true;
}
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