qmk_firmware/converter/ps2_usb/main.cpp

#include "mbed.h"
#include "debug.h"
#include "timer.h"
#include "action.h"
#include "keycode.h"
#include "host.h"
#include "host_driver.h"
#include "mbed_driver.h"
 

// Button and LEDs of LPC11U35 board
DigitalIn isp(P0_1);            // ISP button
DigitalOut led_red(P0_20);
DigitalOut led_green(P0_21);


int main(void) {
    isp.mode(PullUp);
    led_red = 1;
    led_green = 0;

    timer_init();
    host_set_driver(&mbed_driver);
    keyboard_init();

    //debug_enable = true;
    xprintf("mbed_onekey ver.eee:\r\n");


    bool last_isp = isp;
    while (1) {
        keyboard_task();

        //led_green = !led_green;
        if (last_isp == isp) continue;
        last_isp = isp;
        if (last_isp == 0) {
            led_red = 0;    // on
            dprintf("timer: %i\r\n", timer_read());
            //register_code(KC_A);
        } else {
            led_red = 1;    // off
            //unregister_code(KC_A);
        }
    }
}