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Lab Supervisor Dr. WH Lau

EE3271 Design Laboratory

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Aims and Objectives

Design and implement a MP3 Player

Learn the ICs operation and how to useprogram to drive the ICs work.

Learn data transfer in between ICs

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MP3 Overall Flow

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Block Diagram of MP3 Player

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Components Description

LPCEB2000-B Processor Board

Installed with a Philips ARM processor LPC2292

Two debugging modes are available via

JTAG_EN Jumper and ETM_EN Jumper

Boot set jumper: can boot from internal flash orexternal flash by jumper set.

Two I/O ports (P0.0-31, P1.0-31) for I/Ointerface

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J1, J2, J3, J4 are connectors for external businterface. J1 and J3 are 40 Pins, J2 and J4 are20 Pins. J1 and J2 are used to connect the board

to applied board, J3 and J4 are used to extendupwards

J1

J2

J3

J4

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STA015

Microelectronics MP3 decoder chip

An MPEG Layer III audio decoder with ADPCMcompression / decompression capabilities and BYPASSmode for auxiliary audio sources post-processing

Decodes elementary streams compressed by using lowsampling rates

Receives the input data through a Serial input Interface

The decoded signal can be a stereo, mono, or dualchannel digital output.

Interfaced to LPC2292 using the I2C and SPI interfacepins of Port 0

Equipped with a buffer

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CS4334

Stereo digital-to-analog output systems includinginterpolation, 1-bit D/A conversion and output analogfiltering in an 8-pin package

Adjustment of sample rate between 2 kHz and 100 kHzsimply by changing the master clock frequency

On-chip digital de-emphasis, operates from a single +5V power supply, and requires minimal support circuitry

Ideal for portable CD players and other portableplayback systems

Directly connected to the output of STA015 via the IISinterface

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LCD Display

16 characters, 2 rows LCD module

Requires 8-bit ASCII character input and 3 input

control signals

Use for testing wire-wrapped board is correctlyinstalled

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Bus Setting - I2C

A bi-directional 2-wire bus for efficient inter-ICcontrol

There are Serial Data Line (SDA) and Serial

Clock Line (SCL)In this lab, we used I2C to configure the STA015.

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Bus Setting SPI

SPI (Serial Peripheral Interface)

Uses the MOSI (Master Output Slave Input) andMISO (Master Input Slave Output) pins to

perform serial byte data transfer.In this lab, we use SPI to stream the data from

LPC2292 to STA015.

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The flow of bus

SCK

SSEL

MISO, MOSI

SCK

WS

SD

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Design Flow

System Initialization

LCD Initialization

I2C Initialization

STA015 Initialization

SPI Initialization

STA015 Data Request Signal (Polling)

Play song

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System Initialization

Set all the port 0 to GPIO ports

Set the PLL Clock frequency to 60MHz

Code: System_Init() in LCD.c

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LCD Initialization

Set the LCD data pins

By sending command to set the preferences ofthe LCD display

Code: LCD_Init() in LCD.cRelated functions:

--SendCommand(char cmd);

--sendchar(char a);

--LCD_output(char *str);

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I2C Initialization

Code: I2C_Init() in I2C_Test.c

Related functions:

--I2C_IRQ_Srv();

--uint8 I2CTest_SendStr(uint8SlaveAddr, uint8 WrAddr,uint8*Str,uint8 number);

--uint8 I2CTest_RcvStr(uint8 SlaveAddr,uint8 RDAddr,uint8 *Str,uint8 number);

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STA015 Initialization

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STA015 Initialization

Code: sta015_init() in sta015.c

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SPI Initialization

Modify the Clock of SPI

Update the spi_set() function

Code: SPI_Init() in SPI_Test.c

Related functions: spi_set()

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STA015 Data Request Signal (Polling)

Code: Main() in mp3.cwhile(1){

if ((IOPIN0 & P30) == P30) {

spi_set(*song1);

song1++;}

..

}

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Play song

Download a mp3 file to a particular addressthrough EmbestIDE softwares

Run all the initialialzation functions

Signal spi to send data

Code: Main() in mp3.c

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Testing

Check register $01(IDENT) , return 0xAC ifSTA015 is presence

Using the Oscilloscope

-- Checking I2C Clock, I2C Data-- Checking SPI Clock, SPI Data

-- Checking 1KHz tone frequency

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Difficulties Encountered

Unclear concept of STA015

Using wrong Oversampling Ratio

Missing Hardware Reset

Missing Data Request

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Conclusion

What we had learnt

-- Project Management

-- STA015 configuration

-- Debugging with Oscilloscope

-- Practically understand I2C and SPI data

transfer bus

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