#include <usbhid.h>
#include <hidboot.h>

class MyParser : public KeyboardReportParser {
    void OnKeyDown(uint8_t mod, uint8_t key) override {
        uint8_t c = OemToAscii(mod, key);
        if (c) Serial.print((char)c);
    }
};

USB Usb;
HIDBoot<USB_HID_PROTOCOL_KEYBOARD> Keyboard(&Usb);
MyParser Parser;

void setup() {
    Serial.begin(115200);
    if (Usb.Init() == -1) Serial.println("Shield Hardware Error!");
    else Serial.println("Shield OK - Waiting for Barcode...");
    delay(200);
    Keyboard.SetReportParser(0, &Parser);
}

void loop() {
    Usb.Task();
}