1

Audio Driven Laser Tetris

6.111 Final Project Presentation

Cameron Lewis and Xin Sun

2

Overview

Variant of the classic arcade game

VGA display provides all game info

Music drives the block movement

Laser projects the playing field

3

Tetris Game Background

The seven possible Tetris pieces: I, T, O, L, J, S, and Z.(courtesy of Wikipedia)

Snapshot of aTetris game on right

4

System Overview

Game Engine

VGA Display

Audio Module

Laser Display

5

Game Engine Unit & VGA Display Unit

Debouncer andSynchronizer

button_reset

button_up

button_left

Game Engine Unit

(Contains Major and Minor FSMs)

up_sync

reset_sync(global)

DCMlabkit clock(27 MHz)

pixel_clock (31.5 MHz) – to all modules

VGA

Display

VGA signals

down_syncleft_sync

right_sync

button_down

button_right

SignalRegister

rotatedrop

leftright

disp_type[3]

score[6]

j[4]

i[5]

pixel_count[10]

line_count[10]

Counter

update_frame

clean_updatecoord_update

game_updatesignal_reset

speed[2]

rgb [24]

6

Game Engine Unit

Randomizer

Minor FSMDropping Piece

Major FSMMap Controller

i0 [5]

j0 [4]

rotatedrop

rightleft

drop_type[3]

drop_type[3]

i [5]

j [4]

score [6]

reset_synci1 [5]i2 [5]i3 [5]

j1 [4]j2 [4]j3 [4]

reset_syncpixel_clockpixel_clock

clean_updategame_update

coord_update map[25][10][3]

disp_type [3]

7

Audio Processing Module Audio signal digitized by AC97

codec Sampled at 48khz, 18 bit resolution

Fed through FFT module

Triggers changes in block speed upon detection of certain frequency intensities

8

Audio Module

De

bo

un

ce

r /

Syn

ch

ron

ize

r

Audio Supervisory FSM

Frequency Extractor Module

Event Detector

audio_data[realtime]

reset [1]

pixel_clk(31.5 Mhz) [1]

LaserStatusLEDs

[4]

TetrisSpeed

Output [2]

audio_freq_data [255]AC97 Codec

audio_intensity_data [255]

digitized_audio_data

DCM

ac97_clock(12.288 MHz)

labkit_clk(27 Mhz) [1]

reset_clean [1]

9

Laser Projection Module Laser light shines onto a 10-sided

spinning mirror head assembly

Infrared pulses synchronize the display with the labkit

Verilog code modulates the laser accordingly

10

Laser Module

De

bo

un

cer

/ Sy

nch

ron

izer

Laser Supervisory FSM

Image Feeder Laser Control FSM

display_pixel_data [250]

seg_sync

head_sync

seg_sync_clean [1]

reset_clean [1]reset

pixel_clk(31.5 Mhz) [1]

LaserStatusLEDs

[4]

LaserModulation

Output[1]

laser_img_data [250]

head_sync_clean[1]