| CMSIS-Driver Peripheral Interface for Middleware and Application Code |

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USB Interface

USB common definitions (Driver_USB.h) More...

## Content
| USB Device Interface
| Driver API for USB Device Peripheral (Driver_USBD.h)
| USB Host Interface
| Driver API for USB Host Peripheral (Driver_USBH.h)
| USB Speed
| USB Speed definitions.
| USB Endpoint Type
| USB Endpoint Type definitions.

## Description

USB common definitions (Driver_USB.h)

The Universal Serial Bus (USB) implements a serial bus for data exchange. It is a host controlled, plug-and-play interface between a USB host and USB devices using a tiered star topology. In microcontroller (MCU) applications, the interface is often used to connect a device to a host for data exchange or control purposes.

- Wikipedia offers more information about the Universal Serial Bus.
- The USB Implementers Forum provides detailed documentation under www.usb.org.

Block Diagram

Typically only one USB Device is connected to a USB Host. If several USB devices must be connected to the same USB host, then the connection must be done via a USB hub.

Simplified USB Schema

USB API

The following header files define the Application Programming Interface (API) for the USB interface:

- Driver_USB.h : Common definitions of the USBD and USBH interface
- Driver_USBD.h : Driver API for USB Device Peripheral
- Driver_USBH.h : Driver API for USB Host Peripheral

The driver implementation is a typical part of the Device Family Pack (DFP) that supports the peripherals of the microcontroller family.

Driver Functions

The driver functions are published in the access struct as explained in Common Driver Functions

- ARM_DRIVER_USBD : access struct for USBD driver functions
- ARM_DRIVER_USBH : access struct for USBH driver functions