USBPause.h

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// Copyright Pololu Corporation.  For more information, see https://www.pololu.com/

#pragma once

#include <avr/io.h>

class USBPause
{
    uint8_t savedUDIEN;

    uint8_t savedUENUM;

    uint8_t savedUEIENX0;

public:

    USBPause()
    {
        // Disable the general USB interrupt.  This must be done
        // first, because the general USB interrupt might change the
        // state of the EP0 interrupt, but not the other way around.
        savedUDIEN = UDIEN;
        UDIEN = 0;

        // Select endpoint 0.
        savedUENUM = UENUM;
        UENUM = 0;

        // Disable endpoint 0 interrupts.
        savedUEIENX0 = UEIENX;
        UEIENX = 0;
    }

    ~USBPause()
    {
        // Restore endpoint 0 interrupts.
        UENUM = 0;
        UEIENX = savedUEIENX0;

        // Restore endpoint selection.
        UENUM = savedUENUM;

        // Restore general device interrupt.
        UDIEN = savedUDIEN;
    }

};