UM0290 datasheet(5/76 Pages) STMICROELECTRONICS

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UM0290

STR7/STR9 USB firmware library

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STR7/STR9 USB firmware library

This section describes the firmware interface (called USB Library) used to manage the

STR7/9 USB 2.0 full-speed macrocell.

The main purpose of this firmware library is to provide resources to ease the development of

applications using the USB macrocell in all STR7/9 microcontrollers (STR71x, STR75x and

the STR91x families).

1.1

USB application hierarchy

Figure 1 shows the interaction between the different components of a typical USB

application and the USB library.

Figure 1.

USB application hierarchy

The USB library is divided into two layers:

●

USB Library Core layer: This layer manages the direct communication with the USB

IP hardware and the USB standard protocol. The USB Library Core is compliant with

the USB 2.0 specification and doesn’t have dependences with any Standard Software

Library of STR7/9 microcontrollers.

●

Application Interface layer: This layer presents to the user a complete interface

between the library core and the final application.

Note:

The application interface layer and the final application can communicate with the Standard

Software Library to manage the hardware needs of the application.

Hardware (STR microcontroller + Board)

USB IP

USB Application

Standard

Library

usb_core

usb_init

usb_regs

usb_mem

usb_int

usb_istr

usb_prop

usb_endp

Application Interface

USB Library

Core

usb_pwr

usb_desc

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