- #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 USE_MATRIX_I2C
- # include "i2c.h"
- #else
- # include "serial.h"
- #endif
-
- #ifdef EE_HANDS
- # include "eeconfig.h"
- #endif
-
- #ifndef SPLIT_USB_TIMEOUT
- #define SPLIT_USB_TIMEOUT 2500
- #endif
-
- volatile bool isLeftHand = true;
-
- bool waitForUsb(void) {
- for (uint8_t i = 0; i < (SPLIT_USB_TIMEOUT / 100); i++) {
- // This will return true of a USB connection has been established
- if (UDADDR & _BV(ADDEN)) {
- return true;
- }
- wait_ms(100);
- }
-
- // Avoid NO_USB_STARTUP_CHECK - Disable USB as the previous checks seem to enable it somehow
- (USBCON &= ~(_BV(USBE) | _BV(OTGPADE)));
-
- return false;
- }
-
- 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 !is_helix_master();
- #endif
-
- return is_helix_master();
- }
-
- bool is_helix_master(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_master_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
- }
-
- void split_keyboard_setup(void) {
- isLeftHand = is_keyboard_left();
-
- if (is_helix_master()) {
- keyboard_master_setup();
- } else {
- keyboard_slave_setup();
- }
- sei();
- }
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