ao_adc_ack(AO_USB_IN_SIZE);
ao_led_toggle(AO_LED_TRNG_READ|AO_LED_TRNG_WRITE);
ao_usb_write(buffer[usb_buf_id], AO_USB_IN_SIZE);
ao_adc_ack(AO_USB_IN_SIZE);
ao_led_toggle(AO_LED_TRNG_READ|AO_LED_TRNG_WRITE);
ao_usb_write(buffer[usb_buf_id], AO_USB_IN_SIZE);