AVR32934: EVK1104AU Getting Started Guide
Features
• Powering up the board
• Preparing the board for audio playback
• Playing music
1 Introduction
The EVK1104AU is a reference design and development system for the
AT32UC3A3256AU, a 32-bit Atmel® AVR® audio microcontroller from Atmel
Corporation.
From a hardware point of view, the EVK1104AU is identical to the EVK1104, so
you can refer to the EVK1104 for more information (schematics, BOM, etc.). The
only difference is that the main microcontroller is an AT32UC3A3256AU instead of
an AT32UC3A3256.
The AT32UC3A3256AU is an audio microcontroller that authorizes execution of
Atmel licensed Audio firmware IPs such as commercial MP3, AAC, WMA audio
decoders.
The kit is equipped with a rich set of memories and peripherals that make the
EVK1104AU a perfect audio platform. This guide shows the user how to get quickly
started with this kit.
Figure 1-1 EVK1104AU board
32-bit Atmel
Microcontrollers
EVK1104AU
Getting Started
Guide
Rev. 32182A-AVR-11/11
2 AVR32934 32182A-AVR-11/11
2 Powering up the board
The EVK1104AU board can be powered from 3 different sources, external power
supply, “USB VCP” and “USB USER” connector. If two power sources are applied at
the same time the following priorities are used to select the current valid power
source:
1. External power supply (header J2)
2. USB VCP
3. USB USER
That means that if an external power supply is connected to the board, it has the
highest priority and will therefore serve as current power supply. Other power
supplies that are connected to the board at the same time will be ignored.
On the PCB revision 1, the external power supply must be 5.5V. In order to be able to
supply external USB devices that are connected to the board the minimal power
supply specification should be 5.5V, 1A. This ensures that the board will work
properly if a USB device is connected that needs the maximum allowed 500mA as
specified in the USB specification. It is not possible to draw that amount of current
from the host through a normal USB cable but there are cables available that can be
connected to two hosts (such a cable is not a kit cont ent).
When playing music from a mass-storage device, it is enough to power the board
from the USB VCP connector. Use the “Mini-B plug to std-A plug 1.5m USB2.0” cable
that is included in the kit and connect it between the host and the board USB VCP
connector.
AVR32934
3
32182A-AVR-11/11
Figure 2-1 Possible power input interfaces on the EVK1104A U
More information about the different power input s is available in the hardware user’s
guide.
When the board is powered the green LED, marked with “PWR”, will light up and the
default board firmware will start to run.
3 Preparing the board for audio playback
In order to play some music a USB mass-storage device must be connected to the
“USB USER” connector by using the “Mini-A plug to std-A receptacle” adaptor cable.
The adaptor cable is a kit content.
The default audio output should be configure d to use the on board codec and thus the
jumpers on J6 should be set as indicated in the figure if not already set up like this.
USB
USER USB
VCP
J2 power
Input header
4 AVR32934 32182A-AVR-11/11
4 Browsing the disk and playing music
After a mass-storage device has been connected to the USB-USER port the player
enters the disk browsing view. To control the application the touch sensors can be
used that are marked in the Figure 4-1.
Figure 4-1 Touch sensors for controlling the audio application
4.1 Disk browsing view
In this view it is possible to browse the storage media but only MP3 files and
directories will be shown. Use the touch sensors to browse the storage media for the
music file or playlist you want to play.
WHEEL-UP
WHEEL-LEFT WHEEL-RIGHT
WHEEL-DOWN
CS1 CS2 CS3 CS4
AVR32934
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32182A-AVR-11/11
WHEEL-UP: Browse the file list up.
WHEEL-DOWN: Browse the file list down
WHEEL-LEFT: Enter the parent directory. If the user is in the root directory of the
current selected storage media a touch of this button will result in a menu which
lets the user select a storage media.
WHEEL-RIGHT: Enter a subdirectory or play the currently selected file or playlist.
CS3: Play the currently selected file or playlist.
By playing a file or a playlist the audio player will change its view from the disk view to
the play view.
4.2 Play view
Following functionality have the touch sensors in the play view.
WHEEL-UP: Increase the volume.
WHEEL-DOWN: Decrease the volume.
WHEEL-LEFT: Play previous song in playlist or on disk.
WHEEL-RIGHT: Play the next song in playlist or on disk.
CS3: Play/Pause.
CS1: go back to the navigation window. In this mode, the current file is still
playing, and the user can browse the disk and select a new a udio file with CS3 or
WHEEL-RIGHT. User can also switch back to the play view with CS4: it will
display the current playing file.
CS4: repeat/shuffle modes. While in the play mode, this key gives a ccess to the
repeat/shuffle modes. Slide from WHEEL-UP to WHEEL-RIGHT to select Repe at
or Shuffle. Press CS2 to change mode. Go back to the Play view with CS1.
32182A-AVR-11/11
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