keychron_qmk_firmware/keyboard/hhkb_rn42/main.c

#include <avr/io.h>
#include <avr/power.h>
#include <avr/wdt.h>
#include "lufa.h"
#include "print.h"
#include "sendchar.h"


static void SetupHardware(void)
{
    /* Disable watchdog if enabled by bootloader/fuses */
    MCUSR &= ~(1 << WDRF);
    wdt_disable();

    /* Disable clock division */
    clock_prescale_set(clock_div_1);

    // Leonardo needs. Without this USB device is not recognized.
    USB_Disable();

    USB_Init();

    // for Console_Task
    USB_Device_EnableSOFEvents();
    print_set_sendchar(sendchar);
}

int main(void)  __attribute__ ((weak));
int main(void)
{
    SetupHardware();
    sei();

    /* wait for USB startup & debug output */
    while (USB_DeviceState != DEVICE_STATE_Configured) {
#if defined(INTERRUPT_CONTROL_ENDPOINT)
        ;
#else
        USB_USBTask();
#endif
    }
    print("USB configured.\n");

    /* init modules */
    keyboard_init();
    host_set_driver(&lufa_driver);
#ifdef SLEEP_LED_ENABLE
    sleep_led_init();
#endif

    print("Keyboard start.\n");
    while (1) {
        while (USB_DeviceState == DEVICE_STATE_Suspended) {
            suspend_power_down();
            if (USB_Device_RemoteWakeupEnabled && suspend_wakeup_condition()) {
                    USB_Device_SendRemoteWakeup();
            }
        }

        keyboard_task();

#if !defined(INTERRUPT_CONTROL_ENDPOINT)
        USB_USBTask();
#endif
    }
}