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8-bit Microcontrollers Application Note AVR270: USB Mouse Demonstration Features • Runs with AT90USB Microcontrollers at 8MHz • USB Low Power Bus Powered Device (less then 100mA) • Supported by any PC running Windows® (98SE or later), Linux® or Mac OS®. • 3Kbytes of Code Required • X, Y Movement, Left Button Supported 1. Introduction The PS/2 interface has disappeared from the new generations of PCs to leave the place to the USB interface. This change has to be followed by the designers of point- ing devices, who should integrate the USB interface and allow an easy connection to new PCs. This ...
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8-bit

Microcontrollers Application Note AVR270: USB Mouse Demonstration Features

• Runs with AT90USB Microcontrollers at 8MHz • USB Low Power Bus Powered Device (less then 100mA) • Supported by any PC running Windows® (98SE or later), Linux® or Mac OS®. • 3Kbytes of Code Required • X, Y Movement, Left Button Supported 1. Introduction The PS/2 interface has disappeared from the new generations of PCs to leave the place to the USB interface. This change has to be followed by the designers of point- ing devices, who should integrate the USB interface and allow an easy connection to new PCs. This document describes a simple mouse project. It allows to quickly test USB hard- ware using AT90USB without any driver installation. A familiarity with USB firmware architecture (doc 7603, included in the CD-ROM & Atmel website) and the HID specification (http://www.usb.org/developers/hidpage) is assumed., 2. Hardware Requirements The USB mouse application requires the following hardware: 1. AT90USB evaluation board (STK525) 2. AT90USB microcontroller 3. USB cable (Standard A to Mini B) 4. PC running with Windows® (98SE, ME, 2000, XP) or Linux with USB 1.1 or 2.0 host 3. Software Requirement The software needed for this application are: 1. Flip software (Device Firmware Upgrade tool) 2. usb_mouse.a90 (included in the USB CD-ROM) 4. STK525 Default Settings The STK525 board must be configured as below: Figure 4-1. STK525 Board 2 AVR270,

AVR270

All the jumpers should be open, only the Vcc Source jumpers should be set as below: Figure 4-2. Vcc Jumpers Vcc Source Reg 5 Reg3.3 VBUS5

STK

5V 5. Device Firmware Upgrade The first thing to do before starting the demo is to load the HEX file into the On-Chip Flash mem- ory of the microcontroller. The “Flip” software is the tool used to upgrade the firmware (available for free in the USB CD-ROM or ATMEL website). The following steps should be completed to allow the device starting DFU mode, and load the HEX file: 1. Install Flip software. If the latest version of Flip supporting AT90USB is already installed in your computer, please skip the steps 1 and 7 (Flip version 3.0 or above is required). 2. Connect the STK525 board to the computer using the USB cable (Standard A to Mini B). 3. Push the HWB (Hardware Bootloader) button. 4. Push the RST (Reset) button. 5. Release the RST button. 6. Release the HWB button. 7. If your hardware conditions explained above are correct, a new device detection wizard will pop-up. Please follow the instructions (the INF file is located in the USB subdirec- tory from Flip installation: install path:\ATMEL\FLIP\FLIPx.x.x\usb)., Figure 5-1. New Device Detection Wizard Figure 5-2. Driver Location 4 AVR270,

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8. Check the Device Manager, and you should see the same icon (Jungo icon) as shown in the figure below. If not start again from the step 2. Figure 5-3. Device Manager, Once your device is in DFU mode, launch the Flip software and follow the instructions explained below: 1. Select AT90USB device. Figure 5-4. Device Selection 6 AVR270,

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2. Select the USB as communication mode Figure 5-5. USB Communication Mode, 3. Open the communication Figure 5-6. Open the USB Communication. 8 AVR270,

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4. Choose the HEX file to load (the HEX file is including in USB CD-ROM: usb_mouse.a90) Figure 5-7. HEX File to Load, 5. Load the HEX file (Check Erase, Blank Check, Program and Verify, then Push Run button) Figure 5-8. HEX File Loading 10 AVR270,

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6. Start the application Figure 5-9. Start Application Note: The AT90USB bootloader will detach and jump into the user application when “Start Application” button is pressed., 6. Quick Start Once your device is programmed with usb_mouse.a90 file, you can start the mouse demonstra- tion. Check that your device is enumerated as a mouse (see figure 11), then you can use the STK525 as a mouse. Figure 6-1. Mouse Enumeration 12 AVR270,

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The figure below shows the Hardware used by the demo: Figure 6-2. Demonstration Board HardwareHWBbutton Joystick Potentiom eter To move the mouse pointer in several directions (up, down, left, right) just to move the joystick. The potentiometer will be used as a wheel, and the HWB button will be used as a left button., 7. Application Overview The USB mouse application is a simple data exchange between the PC and the mouse. The PC asks the mouse if there is new data available each P time (polling interval time), the mouse will send the data if it is available, otherwise it will send a NAK (No Acknowledge) to tell the PC that there is no data available. The data sent to the PC is called ‘report’. This report has the structure below: Figure 7-1. USB Report Structure Byte 3 Byte 2 Byte 1 Byte 0 WheelYXReserved :default value0210Button left Button right The mouse pointer position Button middle 14 AVR270,

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Figure 7-2. Application Overview, 8. Firmware As explained in the USB Firmware Architecture document (doc 7603, included in the USB CD- ROM ) all USB firmware packages are based on the same architecture. Figure 8-1. USB Mouse Firmware Architecture config.h Mouse main.c application

Enumeration management

management conf_scheduler.h scheduler.c usb_task.h mouse_task.h usb_task.c mouse_task.c usb_standard_ usb_specific_ request.c request.c usb_descriptors.c usb_standard_request.h usb_specific_request.h usb_descriptors.hconf_usb.h usb_drv.c stk_525.c usb_drv.h stk_525.h

USB hardware interface

Should not be modified by user Can be modified by user Added by user

Hardware Drivers API Mouse application Start up

16 AVR270,

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This section is dedicated to the mouse module only. The customization of the files described hereafter allow the user to build his own keyboard Application. 8.1 mouse_task.c This file contains the functions to initialize the mouse, collect the report data and put it in the endpoint FIFO to be ready to be sent to the PC. Figure 8-2. Mouse Application 8.1.1 mouse_task_init This function performs the initialization of the mouse parameters and hardware resources (joy- stick, knurl...). 8.1.2 Is_usb_mouse_event If a mouse event occurs, this function update the USB mouse report and return true. Otherwise it return false. 8.1.3 mouse_task This function checks if Is_usb_mouse_event is true and loads the report in the usb endpoint fifo to be transmited to the host. 8.2 stk_525.c. This file contains all the routines to manage the STK 525 board resssources (Joystick, potenti- ometer, Temperature sensor, LEDs...)., 9. PC Software The USB mouse application does not require any PC software. 10. Limitations The middle and the right buttons are not supported by this demonstartion 11. Related Documents AVR USB Datasheet (doc 7593) USB Firmware Architecture (doc 7603) USB HID class specification (doc 7599) 18 AVR270,

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www.atmel.com/literature Disclaimer: The information in this document is provided in connection with Atmel products. No license, express or implied, by estoppel or otherwise, to any intellectual property right is granted by this document or in connection with the sale of Atmel products. EXCEPT AS SET FORTH IN ATMEL’S TERMS AND CONDI- TIONS OF SALE LOCATED ON ATMEL’S WEB SITE, ATMEL ASSUMES NO LIABILITY WHATSOEVER AND DISCLAIMS ANY EXPRESS, IMPLIED OR STATUTORY WARRANTY RELATING TO ITS PRODUCTS INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTY OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, OR NON-INFRINGEMENT. IN NO EVENT SHALL ATMEL BE LIABLE FOR ANY DIRECT, INDIRECT, CONSEQUENTIAL, PUNITIVE, SPECIAL OR INCIDEN- TAL DAMAGES (INCLUDING, WITHOUT LIMITATION, DAMAGES FOR LOSS OF PROFITS, BUSINESS INTERRUPTION, OR LOSS OF INFORMATION) ARISING OUT OF THE USE OR INABILITY TO USE THIS DOCUMENT, EVEN IF ATMEL HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES. Atmel makes no representations or warranties with respect to the accuracy or completeness of the contents of this document and reserves the right to make changes to specifications and product descriptions at any time without notice. Atmel does not make any commitment to update the information contained herein. Unless specifically providedot- herwise, Atmel products are not suitable for, and shall not be used in, automotive applications. Atmel’sAtmel’s products are not intended, authorized, or warranted for use as components in applications intended to support or sustain life. © Atmel Corporation 2006. All rights reserved. Atmel®, logo and combinations thereof, are registered trademarks, and Everywhere You Are® are the trademarks of Atmel Corporation or its subsidiaries. Other terms and product names may be trademarks of others. Printed on recycled paper.]
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