Playstation 2 Controller KYLE YAN AKSHAY MOORTHY YIPING KANG 1

Playstation 2 ControllerKYLE YAN

AKSHAY MOORTHY

YIPING KANG

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Outline

◦ PS2 Controller Components

◦ Hardware Interface

◦ Bytes and Packets Transfer Mechanism

◦ Packet Structure

◦ Frequently Used Commands

◦ Example

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http://www.walmart.com/ip/Sony-DualShock-2-PS2-Controller-Black-PlayStation-2/907869



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Controller Components• 2x Analog Sticks

• 16x Digital Buttons

• Two Vibration Motors

http://game-tips-etc.blogspot.com/2010/06/humble-ps2-controller.html



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Buttons, Joysticks and Vibration• Buttons

◦ A tiny curved conduction strip attached to the bottom◦ More pressure -> More conductivity

• Joysticks◦ Two potentiometers below each joystick◦ Different angle -> Different resistance

• Vibration◦ Two spinning motors (one big, one small)◦ Controlled separately

http://www.dansdata.com/tmsticks.htm

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Wiring• Brown - Data: MISO

• Orange - Command: MOSI

• Grey - Vibration motor power: 6-9 V

• Red - Power: 5 V. PS1 would work at 3.3V

• Yellow - Attention: Must be pulled low before each group of bytes is sent/received and set high afterwards

• Blue - Clock: Ranges from 100kHz to 500kHz, normally 500.

• Green - Ack: Normally high and drops low for 12 us after each byte for half a clock cycle. Open collector output.

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Brown: data Master-in-slave-out

2008 CuriousInverter.com

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Orange: command Master-out-slave-in


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Grey - Vibration motor power



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Red - Power: 5 V.

PS1 would work at 3.3V


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Yellow - Attention:

Must be pulled low before each group of bytes is sent/received and set high afterwards


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Blue - Clock:

Ranges from 100kHz to 500kHz, normally 500.



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Green - Acknowledge

Normally high and drops low for 12 us after each byte for half a clock cycle. Open collector output.

acknowledge


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How Bytes and Packets Are Transferred• Playstation sends command at the same time it receives one data through serial communication

• Clock is held high until a byte is about to be send. Then it drops low to start a 8 cycles where command and data is simultaneously send and received.

• Reads occurs on rising edge of the clock.

• LSB is transferred first.

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Sample Transaction


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Sample Transaction with Ack


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Sample Transaction with Attention


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Packet Structure Header is always first 3 bytes

• Most Common Commands• 0x42 - Polling buttons• 0x43 – Enter/Exit Config Mode

Byte # 1 2 3Command 01 Main Command 00

Data FF Device Mode 5A

• Device Modes• 0x4X – Digital Mode• 0x7X – Analog Mode• 0xFX – Config Mode

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Main Polling Command (0x42)

• Get digital responses from buttons,

• also control the vibration motors.

Motors Control & Button Digital Output


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Button Mapping• Byte 4 and 5 – Command/Mode dependent data

• Buttons are mapped to bytes 4 and 5 (active low)


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Main Polling Command (0x42)• Get analog response from the joysticks and buttons

Analog Joystick Output (optional)

Button Analog Output (optional)


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Enter/Exit Config Command (0x43)• Config mode allows you to change multiple settings

• Command.4• 0x01 Enter Config• 0x00 Exit Config


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Switching Between Modes (0x44)• Command = 0x44

• Command.4 determines mode• 0x00 – Analog Mode• 0x01 – Digital Mode


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Other Config Commands• Adding/Removing responses

• Vibration control

• Get more status info

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Walkthrough Example

1. Enter config mode

2. Map motors to byte 4 and 5

3. Config the controller to return all values

4. Exit config mode

5. Main polling !

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Walkthrough Example




4. Exit config mode

5. Main polling !

0x00 – small motor0x01 – big motor

Map byte 4 to big motor byte 5 to small motor

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Walkthrough Example




4. Exit config mode

5. Main polling !

• Byte 4 , byte 5 and the two LSB of byte 6 = 18 bits

• Corresponding to 18 bytes in data under main polling command

• ‘1’ indicates the response to be present in the data

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Walkthrough Example




4. Exit config mode

5. Main polling !

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Walkthrough Example




4. Exit config mode

5. Main polling !

Digital Analog Stick Button Pressure (Right fully pressed here)

Motor Control

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Reference Spinning Motor


Interfacing with a PS2 controller

http://store.curiousinventor.com/guides/PS2/

http://www.lynxmotion.com/images/files/ps2cmd01.txt

How buttons and joystick works

http://www.howstuffworks.com/ps23.htm






http://www.lynxmotion.com/images/files/ps2cmd01.txt




Documents

Playstation 2 Controller KYLE YAN AKSHAY MOORTHY YIPING KANG 1