100 lines
2.1 KiB
C
Executable file
100 lines
2.1 KiB
C
Executable file
#include <avr/io.h>
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#include <avr/wdt.h>
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#include <avr/power.h>
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#include <avr/interrupt.h>
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#include <util/delay.h>
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#include <avr/eeprom.h>
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#include "split_util.h"
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#include "matrix.h"
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#include "keyboard.h"
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#include "wait.h"
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#ifdef USE_MATRIX_I2C
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# include "i2c.h"
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#else
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# include "split_scomm.h"
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#endif
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#ifndef SPLIT_USB_TIMEOUT
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# define SPLIT_USB_TIMEOUT 2500
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#endif
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volatile bool isLeftHand = true;
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bool waitForUsb(void) {
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for (uint8_t i = 0; i < (SPLIT_USB_TIMEOUT / 100); i++) {
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// This will return true of a USB connection has been established
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if (UDADDR & _BV(ADDEN)) {
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return true;
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}
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wait_ms(100);
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}
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// Avoid NO_USB_STARTUP_CHECK - Disable USB as the previous checks seem to enable it somehow
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(USBCON &= ~(_BV(USBE) | _BV(OTGPADE)));
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return false;
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}
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__attribute__((weak)) bool is_keyboard_left(void) {
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#if defined(SPLIT_HAND_PIN)
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// Test pin SPLIT_HAND_PIN for High/Low, if low it's right hand
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setPinInput(SPLIT_HAND_PIN);
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return readPin(SPLIT_HAND_PIN);
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#elif defined(EE_HANDS)
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return eeconfig_read_handedness();
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#elif defined(MASTER_RIGHT)
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return !has_usb();
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#endif
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return has_usb();
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}
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__attribute__((weak)) bool has_usb(void) {
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static enum { UNKNOWN, MASTER, SLAVE } usbstate = UNKNOWN;
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// only check once, as this is called often
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if (usbstate == UNKNOWN) {
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#if defined(SPLIT_USB_DETECT)
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usbstate = waitForUsb() ? MASTER : SLAVE;
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#elif defined(__AVR__)
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USBCON |= (1 << OTGPADE); // enables VBUS pad
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wait_us(5);
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usbstate = (USBSTA & (1 << VBUS)) ? MASTER : SLAVE; // checks state of VBUS
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#else
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usbstate = MASTER;
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#endif
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}
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return (usbstate == MASTER);
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}
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static void keyboard_master_setup(void) {
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#ifdef USE_MATRIX_I2C
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i2c_master_init();
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#else
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serial_master_init();
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#endif
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}
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static void keyboard_slave_setup(void) {
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#ifdef USE_MATRIX_I2C
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i2c_slave_init(SLAVE_I2C_ADDRESS);
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#else
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serial_slave_init();
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#endif
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}
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void split_keyboard_setup(void) {
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isLeftHand = is_keyboard_left();
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if (has_usb()) {
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keyboard_master_setup();
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} else {
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keyboard_slave_setup();
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}
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sei();
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}
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