Atmel AT89C51SND1 Manuale utente

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.

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.

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