Digilent I/O Explorer Manuel de référence - Page 2

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I/O Explorer™ USB Reference Manual

various kinds of I/O operations to devices on the I/O Explorer board itself, or through the I/O Explorer to devices

external to the computer.

The I/O Explorer provides a number of I/O devices on the board itself, as well as RC servo connectors, and Digilent

Pmod ports that allow access to devices external to the I/O Explorer.

In addition to its use as a dedicated USB peripheral device, the I/O Explorer can also be used as a microcontroller

development board. It features two Atmel AVR microcontrollers, one having USB device capability. Digilent makes

available the firmware images needed to restore it to the factory configuration as a USB peripheral device if it has

been reprogrammed with user defined firmware.

Functional Description

The Digilent USB I/O Explorer is a microcontroller board that is designed to be used as a USB peripheral device to

expand the I/O capabilities of a PC running either the Microsoft Windows operating system or the Linux operating

system. The Digilent Adept Software System provides the run-time software for operation of the board, and the

Digilent Adept Software Development Kit (SDK) allows the user to write custom application software to access and

control its features. The Digilent Adept SDK comes with a variety of sample programs that illustrate operation of

various features of the I/O Explorer.

The I/O Explorer provides a number of built-in I/O devices, such as switches, push buttons, LEDs, rotary encoders,

and a speaker/buzzer. It also provides a number of connectors that allow access to and control of devices external

to the I/O Explorer.

Operation of the I/O Explorer board as a Digilent Adept compatible device requires the installation of the Digilent

Adept software available for download from the Digilent web site: www.digilentinc.com. In addition to

downloading and installing the Digilent Adept software, the Digilent Adept SDK must be downloaded and installed

in order to make effective use of the board.

In addition to the Digilent Adept SDK, the user will require some software development tool that allows writing

application programs on the target operating system. The Digilent Adept System uses the C programming language

calling conventions and any development tool that provides the ability to call C functions in a DLL (on Windows) or

a shared library (on Linux) can be used. Some version of Microsoft Visual Studio is commonly used on Windows,

and some version of the GCC tool chain is normally used on Linux.

In addition to the primary design purpose of being a dedicated USB peripheral device, the I/O Explorer can also be

used as a microcontroller development board. The I/O Explorer contains two Atmel AVR microcontrollers: IC1, the

primary microcontroller is an AT90USB646 AVR microcontroller with USB capability; IC2, the secondary

microcontroller is an ATmega165P AVR device.

Development of custom firmware to run on the I/O Explorer requires the use of some development tool that

supports the Atmel AVR microcontroller family. The most common tool used is the free Atmel AVR Studio IDE and

assembler available for download from the Atmel web site. The free GCC based WinAVR C compiler system can be

used with Atmel's AVR Studio and provides a very powerful C language programming environment. WinAVR is

available for free download from the internet from various sources.

In addition to the development tool software, using the I/O Explorer as a microcontroller development platform

requires a programming cable, or in-system-debugger to load the user firmware into the microcontroller. The I/O

Explorer is designed to allow use of the Atmel JTAG-ICE mk II or the Atmel AVR Dragon for in-system debug. In-

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