void usb_isr(void) // Handle USB interrupts uint32_t irq = usb_get_irq(); if (irq & USB_IRQ_BULK_IN) // Handle Bulk IN interrupt else if (irq & USB_IRQ_BULK_OUT) // Handle Bulk OUT interrupt

For deep controller errors, you may need a . These are manufacturer-level utilities used to reflash the controller.

: In Device Manager , go to the properties of your USB device and uncheck "Allow the computer to turn off this device to save power". 2. Firmware Flashing (Mass Production Tools)