UM0290 datasheet(23/76 Pages) STMICROELECTRONICS

No. de pieza	UM0290

Descripción Electrónicos	This document presents a description

PDF	76 Pages

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Fabricante Electrónico	STMICROELECTRONICS [STMicroelectronics]

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UM0290

Joystick mouse demo

23/76

Joystick mouse demo

A USB mouse (Human Interface Device class) is a simple example of a complete USB

application. The joystick mouse uses only one interrupt endpoint (endpoint 1 in the IN

direction). After normal enumeration, the host requests the HID report descriptor of the

mouse. This specific descriptor is presented (with standard descriptors) in the file

usb_desc.c.

To get the mouse pointer position the host requests four bytes of data using the pipe 1

(endpoint 1) with the following format:

Figure 2.

Joystick mouse data format

The purpose of the mouse demo is to set the X and Y values according to the user actions

with a joystick button. The function JoyState() (b) gets the user actions and returns the

direction of the mouse pointer. The function Joystick_Send() (b) formats the data to send

to the host and validates the data transaction phase.

File HW_config.c

UM0290 Datasheet(PDF) 23 Page - STMicroelectronics