Code:

Interrupt latency:
The application must ensure that the USB interrupt is not disabled for more
than 25 cycles (this is for 12 MHz, faster clocks allow longer latency).
This implies that all interrupt routines must either be declared as "INTERRUPT"
instead of "SIGNAL" (see "avr/signal.h") or that they are written in assembler
with "sei" as the first instruction.

Code:

for(;;){                /* main event loop */
        wdt_reset();

        AdcGetCurrentStatus (&AdcCurrentState_en);

        /* Get data from Adc if AD conversion is finished */
        if (ADC_FINISHED == AdcCurrentState_en) {

            /* Read single channel data from ADC */
            AdcGetCurrentData(&AnalogAxisData_u16);
        }

        usbPoll();

        if(usbInterruptIsReady()){
            usbSetInterrupt((void *)&AnalogAxisData_u16, sizeof(AnalogAxisData_u16));
        }
    }