Atmel AT89C51SND1 User manual

MP3 Player Reference Design
Based on AT89C51SND1
Microcontroller
..............................................................................................
User Guide

AT89C51SND1 Reference Design User Guide 1
4207B–MP3–04/07
Table of Contents
Section 1
Introduction...............................................................................................1
1.1 Web Site download...................................................................................... 1
1.2 Abbreviations............................................................................................... 2
Section 2
Overview ..................................................................................................3
2.1 User Interface .............................................................................................. 4
2.2 Quickstart .................................................................................................... 6
2.2.1 Power ON/OFF ..................................................................................... 6
2.3 Main Functions ............................................................................................ 6
2.4 Mode Functions ........................................................................................... 6
2.5 Alternate Functions...................................................................................... 7
2.6 Special Information...................................................................................... 7
Section 3
Overview of Modes...................................................................................8
3.1 Song Mode .................................................................................................. 8
3.2 Voice Mode.................................................................................................. 8
3.3 USB Mode ................................................................................................... 8
3.4 Erase Mode ............................................................................................... 10
Section 4
In-System Programming (ISP) ...............................................................11
4.1 Using Hardware Conditions....................................................................... 11
4.2 Using Software Condition.......................................................................... 11

AT89C51SND1 Reference Design User Guide 1-1
Rev. 4207B–MP3–04/07
Section 1
Introduction
The AT89RFD-01 is an MP3 reader reference design based on the AT89C51SND1
microcontroller. The AT89RFD-01 has the following features:
• Upload and Download of Files Through a USB Interface
• Plays or Records Songs
• Adjustable Volume, Treble, Medium and Bass
• Record Voice Through a Microphone in .WAV Format
1.1 Web Site
download
1. Connect to:
https://www.atmel-nantes.fr/.mp3/at8xc51snd1c
User Name is: atmelmp3
Password is: snd3pass
2. Copy the at8xc51snd1c.zip file to your PC.
3. Unzip the package to your local hard drive.

Introduction
AT89C51SND1 Reference Design User Guide 1-2
4207B–MP3–04/07
1.2 Abbreviations AT89C51SND1: the MP3 microcontroller
ISP: In-System Programming
MP3: MPEG layer 3, a standard music format
PC: Personal Computer
USB: Universal Serial Bus

AT89C51SND1 Reference Design User Guide 2-3
Rev. 4207B–MP3–04/07
Section 2
Overview
Figure 2-1. Reference Design (Top view)
There are two connectors:
Earphone stereo jack
Mini-B USB connector

Overview
AT89C51SND1 Reference Design User Guide 2-4
4207B–MP3–04/07
Figure 2-2. Reference Design (bottom view)
The battery is a standard 1.5V-battery type AAA.
The mass storage system on the board is a 64 MB NAND Flash memory.
2.1 User Interface The user interface has 4 LEDs and 5 push-buttons:
Play/Pause
Function
Previous - Minus
Next - Plus
ON (Pwr)

Overview
AT89C51SND1 Reference Design User Guide 2-5
4207B–MP3–04/07
Figure 2-3. User Interface Overview
Each LED may be:
OFF
Flashing (ON during less than 1 second and only one time)
Slow blinking (continuously)
Fast blinking (continuously)
ON
microphone
headphone
connector
Play/Pause
ON (Pwr)
LED n°1
LED n°2
LED n°3
LED n°4
AT89C51SND1
Function (Func)
USB connector
Next/Plus
Previous/Minus

Overview
AT89C51SND1 Reference Design User Guide 2-6
4207B–MP3–04/07
2.2 Quickstart This procedure allows you to quickly play an MP3 song stored in the mass storage sys-
tem. If the mass storage is empty or not formatted, see the following section regarding
MP3 upload (“USB Mode”).
4. If the player is battery powered, push the ON button. If the player is powered by
USB, plug the USB cable into your computer.
All LEDs flash to confirm the power is ON.
After a few seconds, depending of the mass storage type and size, LED n°1 is
ON: indicating Song Mode is selected.
5. Push the Play/Pause button to play the first MP3 song of the mass storage
medium.
LED n°1 blinks during music play.
6. If the player is battery powered, after 1 minute of inactivity (no music), the player
will be automatically turned off.
2.2.1 Power ON/OFF Press the ON button to power the player. Power off is automatic after one minute of
inactivity (no music, no button pressed). When the player is connected to a PC using the
dedicated USB cable, the player is powered by the USB power line and the battery is
useless (and will not be discharged). Disconnecting USB cable will automatically switch
supply to the battery without stopping the operation.
2.3 Main Functions Main functions are the first meaning of the buttons:
Play/Pause: this button means Play/Pause or Select or Record
Function: to change the current mode or alternate function
Plus/Minus: to change a music track or change a control level
ON: to power on the player using the battery
2.4 Mode Functions After power ON and initialization (step 1 of the previous section), there are 4 basic func-
tions called “modes”, assigned to a dedicated LED:
LED n°1: Song Mode, to play the MP3 files of the embedded mass storage system
LED n°2: Voice Mode, to play or record short “wav” messages (phone quality)
LED n°3: USB Mode, to upload or download files to the embedded storage system
LED n°4: Erase Mode, to format the mass storage system
By pressing the Function key sequentially, the user will switch between these modes
(mode 1, 2, 3, 4, 1...). The LED ON indicates the current mode.
To validate one of these modes, press the Play/Pause button. For instance, if LED n°1
is ON, the current mode is “Song Mode”. The Play/Pause button will start the MP3
music.

Overview
AT89C51SND1 Reference Design User Guide 2-7
4207B–MP3–04/07
2.5 Alternate
Functions
When a mode is validated, the corresponding LED blinks slowly (except for USB mode,
LED n°3 blink quickly when mode is activated and more slowly during transfer). Alter-
nate functions regarding this mode are then accessible using the Function button. One
LED blinking quickly is dedicated for each alternate function.
For Song Mode, alternate functions are:
LED n°1: Volume Control
LED n°2: Bass Control
LED n°3: Medium Control
LED n°4: Treble Control
LED n°2,3,4: Bass Boost Control
For Voice Mode, alternate functions are:
LED n°1: Volume Control
LED n°2: Stop and wait for Recording confirmation (to be validated by Play/Pause)
For other modes, there exist no alternate functions at the present time.
To adjust the controls, press Previous/Minus (to decrease) or Next/Plus (to increase)
the control level. A bar graph lights up for the corresponding control when one of these
buttons are pressed and during the adjustment, the control ranges from all LED OFF
(minimum level) to all LED ON (maximum level).
If no buttons are pressed for 3 seconds, the alternate functions setup ends and the LED
corresponding to the current mode blinks slowly (Play information).
2.6 Special
Information
Normally only one LED is ON or blinking at the same time. Exceptions are:
Change of Music Track: all LEDs flash one time
Start-up/Power ON: all LEDs flash one time
Voice Record: LEDs 1, 3 and 4 blink
Software ISP mode: LEDs 1 and 4 ON
Bar graph for the selected Control: from 0 to 4 LEDs ON
Error report: all LEDs are ON
Note: A possible error is that the mass storage system is not formatted. If this is the
case, press the Function button until Format Mode is selected and validate this
mode with the Play/Pause button.
All LEDs are off during:
Format process of mass storage
Initialization
Power OFF

AT89C51SND1 Reference Design User Guide 3-8
Rev. 4207B–MP3–04/07
Section 3
Overview of Modes
3.1 Song Mode This mode will allow users to listen to the MP3 song stored in the embedded mass stor-
age system. If the memory is empty, LED n°1 does not blink and there is no music. If
there are valid MP3 files in the memory, the player will play the first song and LED n°1
blinks slowly.
Main and alternate functions give access to standard player functions.
3.2 Voice Mode When entering Voice Mode, the first wav file in the directory will be selected and played.
When the player reaches the end of a wav file, or if wav file is not present, the player will
switch to record mode: LED n°2 blinks quickly. If the button Play/Pause is pressed, the
player records voices from the microphone. If the Function button is pressed, the player
will go back to its initial state (Voice Mode selected).
The microphone will record the voice and store it in the selected file until the maximum
size of the wav file is reached. When the maximum size is reached, the player will go
back to its initial state.
3.3 USB Mode This mode will allow users to connect the player to a PC running under Linux
®
, Win-
dows
®
2000/XP/Me and MacOS
®
9 (without driver) or Windows 98 (with a driver). The
Data Storage Flash will then be seen as a removable disk drive and copying from any
PC storage media to the player memory will be possible. Current firmware does not sup-
port Windows Format function.
Prior to entering this mode, a USB cable has to be connected between the PC and the
player. The player will then be powered by the USB supply. When entering USB mode,
USB lines will be activated and a device will appear in the Hardware window of the PC.
Note: First connection may require the driver installation depending of your Operating
System.
When connected, LED n°3 blinks quickly. When a file is moved to the player, this LED
does not blink regularly. Transfer is completed when the LED continues to blink quickly
and regularly.
Note: The file will appear in the removable media window on the PC before the end of
the transfer (almost at the beginning!).
Do not disconnect the cable during an on-going transfer.