Basic i50Phone

11/2/2007 EECS150 Lab Lecture #10 1

Basic i50Phone

EECS150 Fall 2007 - Lab Lecture #10Allen Lee

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Example

M S 10

MyTeamUsrName1

UsrName2UsrName3

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Example

M S 10

MyTeamUsrName1

UsrName2UsrName3

Dialing User: UsrName2 Cancel(B)

UsrName4

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Example

M S 10

MyTeamUsrName1

UsrName2UsrName3

Dialing User: UsrName2 Cancel(B)

UsrName4

User Unavailable

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Example

M S 10

MyTeamUsrName1

UsrName2UsrName3

Dialing User: UsrName2 Cancel(B)

UsrName4

User UnavailableDialing User: UsrName3 Cancel(B)

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Example

M S 10

MyTeamUsrName1

UsrName2UsrName3

Dialing User: UsrName2 Cancel(B)

UsrName4

User UnavailableDialing User: UsrName3 Cancel(B)Connection Established

UsrName3

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Example

M S 10

MyTeam

UsrName2UsrName3

Dialing User: UsrName2 Cancel(B)

UsrName4

User UnavailableDialing User: UsrName3 Cancel(B)Connection Established

UsrName3

Connection Terminated

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Example

M S 10

MyTeam

UsrName2UsrName3

Dialing User: UsrName2 Cancel(B)

UsrName4

User UnavailableDialing User: UsrName3 Cancel(B)Connection EstablishedConnection Terminated

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Example

M S 10

MyTeam

UsrName2UsrName3UsrName4

User UnavailableDialing User: UsrName3 Cancel(B)Connection EstablishedConnection TerminatedCall From: UsrName4 Acc(A)/Rej(B)

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Example

M S 10

MyTeam

UsrName2UsrName3UsrName4

Dialing User: UsrName3 Cancel(B)Connection EstablishedConnection TerminatedCall From: UsrName4 Acc(A)/Rej(B)Connection Established

UsrName4

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Overview

Introduction to Checkpoint 4 Adding to Checkpoint 1 Adding to Checkpoint 2 Communications protocol Advice Extra Credit

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Checkpoint 4 = Everything in this circle

Checkpoint 4 (Communications and Registry)

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Checkpoint 4 Additions

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Adding to Checkpoint 1 Audio Buffer

Previously stored all audio data into one huge FIFO and local playback.

Must now support sending and receiving audio data from transceiver.

AC97 Controller Remains the same

Volume and Mute signals now come from user input module in CP2.

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Old Audio Buffer

Data output from FIFO goes back to Audio controller:

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New Audio Buffer

Must now support sending and receiving from wireless transceiver:

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Adding to Checkpoint 2 User Input Parser

Keep track of a cursor position (0 through 7) for each of the top two regions.

Only allow the cursor of a particular region to change when the focus is on that region.

When the cursor is on a valid user in the Channel region, and “A” is pressed:

Change the focus to the console. Send a call request, and wait for a response.

Press “B” to cancel the request and change focus to Channel region.

Ignore incoming calls while requesting a call. When a connection established or refused, change

focus to Channel region.

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Adding to Checkpoint 2 User Input Parser (cont’d)

When the cursor is on a valid user in the “Connection” region, and “B” is pressed:

Send a disconnect signal Focus remains in “Connection” region

When there is an incoming call and you are not requesting a call:

Change focus to console Press “A” to accept, or “B” to reject

In either case, return focus to “Channel”

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Adding to Checkpoint 2 Video Display

Support a registry that stores up to 8 users in the channel and 8 connected users.

New users may arrive in the Channel at any time. Support disconnecting from a connected user. Don’t worry about supporting more than 8 users. Remove users that timeout (more on this later).

Store and display appropriate console messages (use RAM for this).

Console must display up to 8 lines of 32 characters each.

Once console fills up, each new message should push the oldest one out.

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Announcements

Checkpoint 3 is due in two weeks Week of 11/12

Checkpoint 4 is due in four weeks Week of 11/26

Checkpoint 4 design reviews next week.

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Announcements

Each group should have been assigned a channel during lab last week.

Don’t continuously spam your channel. Another group is sharing your channel. Guaranteed your channel during your lab

section. Channel assignments will be posted

this weekend.

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Announcements

Clarification for Checkpoint 3 BigOut and BigIn should be 328 bits

(41-bytes), not 320 bits (40-bytes). An updated version of the checkpoint

has been uploaded.

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Announcements

Midterms have been graded Pick them up after lab lecture.

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Communications Module

Responsibilities Announce presence every 250 ms. Initiate a call with another station. Acknowledge a call request. Reject a call request. Receive audio data.

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Packet Format

The 41-byte payload from Checkpoint 3 belongs to the “application layer” 1-byte header 40-byte payload

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Packet Format

Header (8-bits)

Type Payload (320-bits)

8’h0 Announce {256’h0, UserName}

8’h1 Init Call {256’h0, UserName}

8’h2 Accept Call {256’h0, UserName}

8’h3 Reject Call {256’h0, UserName}

8’h4 Ack Init {256’h0, UserName}

8’h5 Data Audio Data

8’h6 Ready 320’hX

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Packet Types Announce

Broadcast (0xFF) an announcement packet containing your user name every 250 ms.

Init Call You want to initiate a call request to

someone specific. Ack Init

Acknowledge that you received an init call request, but neither accept nor reject.

Accept Call Accept a call request

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Packet Types

Reject Call Reject a call request

Data Payload contains audio data

Ready Acknowledge an accept call. Used to keep an active connection

alive when no data is being sent.

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Communications Behavior Sit idle and receive packets by default. Send an Announce packet every 250 ms. If received packet is an Announce packet,

notify Video Display. If you initiate a call request, send an Init Call

packet and wait for acknowledgement. Keep exchanging Init Call/Ack Init until one of the

following happens Connection times out. Accept Call packet is received, establish chat. Reject Call packet is received, return to idle state. You press Cancel.

No need to send Announce packets during Init Call/Ack Init exchange

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Communications Behavior During a call, perform the following:

Receive audio data and Ready packets. Reset timeout counter.

Send audio data whenever it is ready. Receive Announce packets and notify Video Display. Optionally send Ready packets to keep the

connection alive in the absence of audio data. Return to idle receive state if:

Neither audio data nor Ready is received in 1 second.

You manually disconnect the call. No need to send Announce packets during a

call.

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Caller Receiver Caller UI Receiver UI

ANNOUNCE . Populate Caller in Channel User List

ANNOUNCEPopulate Receiver in

Channel User List

ANNOUNCE .Persist Caller in

Channel User List

. .Persist Receiver inChannel User List

. .

. .

INIT_CALL . Dialing User Receiver Incoming Call Caller

ACK_INIT

INIT_CALL

. ACK_INIT

. .

. .

Communications Behavior

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Communications Behavior. ACCEPT_CALL

Connection EstablishedPopulate Receiver in

Call User List

READYConnection Established

Populate Caller inCall User List

DATA

DATA

DATA

DATA

No Response

DATA .

.

DATA .

. Possible Timeout

DATA . Connection Timed Out

(Disconnect) .

. . Depends on direction

. . of lost packets

. .

. .

. . Possible Timeout

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Tips, Hints, & Common Pitfalls

Start early If you’re already done with CP3, start

designing now! We are not providing skeleton Verilog

files Run the TA solution to see what

the final result should look like.

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Tips, Hints, & Common Pitfalls Split up the checkpoint to work in parallel with

your partner: User input parser can be fully tested independently

without Video Display or Communications. Video Display can be fully tested with a simple user

input parser and no Communications. Communications module can be fully tested in

ModelSim without the user input parser or video display.

Do not combine until you’ve verified each part works independently.

It can take up to 50 minutes to push to board after combining!

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Tips, Hints, & Common Pitfalls Reset is unreliable if N64 controller

is unplugged (unknown button status is returned).

Even if N64 controller is plugged in, the user input parser may still enter an unpredictable state upon Reset.

Output the current state of the parser somewhere and keep resetting until it enters the correct state.

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Requirements

Support persistent two-way communication between two stations. Need not be compatible with TA solution Single bit file

Latency between speaking into microphone and hearing on remote station must be less than 1 second.

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Extra Credit Maximum 20% Some Ideas (Exact % TBD):

Text messaging Talk with more than 1 person simultaneously Audio effects (e.g. reverberations) Using the console region for a shared game (e.g.

Pong, Tetris, Guitar Hero) Send video Record and playback a long conversation using

SDRAM Ring tones

Open-ended! Come up with something special, cool, clever, unique, and/or challenging.

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Stay Tuned…

The spec has not been finalized yet. It should be up by later tonight.

There is enough information in these lecture slides to get you started.

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Questions?