ECE 448 Lab 4 VGA Display Snake Game

ECE 448: Lab 4 VGA Display Snake Game

Flexibility in the Second Part of the Semester Schedule A: Lab 4: VGA display (2 weeks) – 8 points Lab 5: Computer Graphics (2 weeks) – 8 points Lab 6: Pico. Blaze System (2 weeks) – 8 points Lab 7: Logic Analyzer (in class) – 2 bonus points Total: 24+2 points Schedule B: Lab 4: VGA display (3 weeks) – 8 points Lab 5: Computer Graphics or Lab 6: Pico. Blaze System Lab 7: Logic Analyzer (3 weeks) – 8 points (in class) – 2 bonus points Total: 16+2 points

Flexibility in the Second Part of the Semester Schedule A+: • Intended for students who do exceptionally well in the first part of the semester ( ≥ 90% of points for Labs 1 -3) • An open-ended project proposed by students, the TAs, or the instructor • Can be done individually or in groups of two students • Schedule: Detailed Specification (1 week) Milestone 1 (2 weeks) Milestone 2 (2 weeks) Final Report & Deliverable (1 week) Total: 25 points

Expected Project Tasks Schedule A+: 1. Use of at least one complex input/output device • VGA display • Keyboard or Mouse (USB-HID) • Ethernet, etc. 2. Use of on-chip embedded resources: BRAMs, DSP units or External on-board memory or Soft microcontroller core (e. g. Picoblaze) 3. (bonus) Use of PMOD Accessory Boards implementing additional functions, e. g. , A/D, D/A, motor drivers, sensors, cameras.

Lab 4 Exercises

Reading • P. Chu, FPGA Prototyping by VHDL Examples Chapter 12, VGA Controller I: Graphic • Nexys 3 Reference Manual VGA Port, pages 15 -17 • Nexys 4 Reference Manual VGA Port, pages 13 -17 ECE 448 – FPGA and ASIC Design with VHDL 6

Lab 4 Exercise 1 Displaying synchronization signals on the oscilloscope 7

Lab 4 Exercise 1: Tasks • Develop a testbench for the circuit, described in the figure on the previous slide. • Perform functional simulation, displaying ALL ports of vga_sync component. • Synthesize and implement the top-level circuit using provided UCF file • Perform timing simulation, displaying ALL ports of vga_sync component. • Perform experimental testing using oscilloscope, displaying clk, hsync, vsync. 8

Lab 4 Exercise 2 • Resolution: 640 x 480 • Display: 8 colors (3 bits), 16 colors (4 bits), 64 colors (6 bits), 256 colors (8 bits) • Refresh Rate: 25 Hz, 30 Hz, 60 Hz (frames / second) 9

Interface

Use of switches

Configuration : 1

Configuration : 2

Configuration : 3

Configuration : 4

Configuration : 5

Configuration : 6

Configuration : 7

Configuration : 8

Specification of coordinates of three objects assuming sw(4)=0

Specification of colors of three objects

Specification of dimensions of the ball

Introduction to Lab 4

Game Objects and Background

Task 1: Create Background (Points: 15%) • Snake Color: Black and Red • Color Generator: Selects colors for the background • VGA Controller: Sync generator

Task 2: Snake Movement • • (Points: 20%) The game should reset when the snake hits the boundary. The snake must not cross the boundary. Movement of snake is always ON. The Red arrows depict movement of the Snake; they should not be drawn on the screen.

Task 3: Snake speed (Points: 5%) • • Switches 0 -1 select the step size to change the Snake’s speed (in both horizontal and vertical direction). position “ 00” means step size = 4, “ 01” means step size = 8, and “ 10” means step size = 12.

Task 4: Displaying Boundaries and Diamonds (Points: 25%) • The Snake should be restricted to stay within the boundaries. • Whenever the Snake touches any of the Diamonds they should disappear from the screen.

Task 5: Displaying score and rules on VGA display (Points: 25%) • Whenever the Snake touches any of the Red Diamonds, the Score should be incremented and displayed on the screen. • Whenever the Snake touches the Boundary the Game has to restart and the score must be reset to ‘ 0’.

Task 6: Displaying Text on the Screen (Points: 10%) • When the Snake eats all food, then you should display “You Won!” in the Green Color on the screen.

Bonus Task 1: Adding movable boundaries (Points: 10%) • Add two small blue inner boundaries which act exactly the same like the outside black boundary. • These lines move up and down in constant speed, as shown in the figure below. • Whenever the Snake touches the Boundary the Game has to restart and the score must be reset to ‘ 0’.

Bonus Task 1: : Adding movable boundaries(2)

Bonus Task 1: Adding movable boundaries(3)

Bonus Task 2: Adding Blinking Stars (Points: 10%) • When the Snake eats all food, you should display “You Won!”, with blinking stars, for 5 Seconds as shown below.

Lab 3 Demos