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-rw-r--r--keyboards/crkbd/rev1/legacy/split_util.c127
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diff --git a/keyboards/crkbd/rev1/legacy/split_util.c b/keyboards/crkbd/rev1/legacy/split_util.c
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+/*
+Copyright 2019 @foostan
+Copyright 2020 Drashna Jaelre <@drashna>
+
+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 2 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 <avr/io.h>
+#include <avr/wdt.h>
+#include <avr/power.h>
+#include <avr/interrupt.h>
+#include <util/delay.h>
+#include <avr/eeprom.h>
+#include "split_util.h"
+#include "matrix.h"
+#include "keyboard.h"
+#include "wait.h"
+
+#ifdef EE_HANDS
+# include "eeconfig.h"
+#endif
+
+#ifdef USE_MATRIX_I2C
+# include "i2c_master.h"
+#else
+# include "split_scomm.h"
+#endif
+
+#ifndef SPLIT_USB_TIMEOUT
+# define SPLIT_USB_TIMEOUT 2000
+#endif
+
+#ifndef SPLIT_USB_TIMEOUT_POLL
+# define SPLIT_USB_TIMEOUT_POLL 10
+#endif
+
+volatile bool isLeftHand = true;
+
+bool waitForUsb(void) {
+ for (uint8_t i = 0; i < (SPLIT_USB_TIMEOUT / SPLIT_USB_TIMEOUT_POLL); i++) {
+ // This will return true if a USB connection has been established
+ if (UDADDR & _BV(ADDEN)) {
+ return true;
+ }
+ wait_ms(SPLIT_USB_TIMEOUT_POLL);
+ }
+
+ // Avoid NO_USB_STARTUP_CHECK - Disable USB as the previous checks seem to enable it somehow
+ (USBCON &= ~(_BV(USBE) | _BV(OTGPADE)));
+
+ return false;
+}
+
+__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
+ setPinInput(SPLIT_HAND_PIN);
+ return readPin(SPLIT_HAND_PIN);
+#elif defined(EE_HANDS)
+ return eeconfig_read_handedness();
+#elif defined(MASTER_RIGHT)
+ return !has_usb();
+#endif
+
+ return has_usb();
+}
+
+__attribute__((weak)) bool has_usb(void) {
+ static enum { UNKNOWN, MASTER, SLAVE } usbstate = UNKNOWN;
+
+ // only check once, as this is called often
+ if (usbstate == UNKNOWN) {
+#if defined(SPLIT_USB_DETECT)
+ usbstate = waitForUsb() ? MASTER : SLAVE;
+#elif defined(__AVR__)
+ USBCON |= (1 << OTGPADE); // enables VBUS pad
+ wait_us(5);
+
+ usbstate = (USBSTA & (1 << VBUS)) ? MASTER : SLAVE; // checks state of VBUS
+#else
+ usbstate = MASTER;
+#endif
+ }
+
+ return (usbstate == MASTER);
+}
+
+static void keyboard_master_setup(void) {
+
+#ifdef USE_MATRIX_I2C
+ i2c_init();
+#else
+ serial_master_init();
+#endif
+}
+
+static void keyboard_slave_setup(void) {
+
+#ifdef USE_MATRIX_I2C
+ i2c_slave_init(SLAVE_I2C_ADDRESS);
+#else
+ serial_slave_init();
+#endif
+}
+
+// this code runs before the usb and keyboard is initialized
+void split_keyboard_setup(void) {
+ isLeftHand = is_keyboard_left();
+
+ if (has_usb()) {
+ keyboard_master_setup();
+ } else {
+ keyboard_slave_setup();
+ }
+ sei();
+}