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PONG REDUX Gregg Scranton Ben Pratt The Idea • ATMega88PA chip controls the game logic • DAC and ADC interface analog world with digital logic • Oscilloscope used as the display • Paddles controlled by potentiometers Hardware • 8-bit DAC – SPI interface • 10-bit ADC – Only 8-bit precision – Mux • Two 10k potentiometers – Voltage divider SPI wires Y voltage X voltage Hardware • Tektronix 2445A analog oscilloscope – Retains old-school feel – Phosphor display offers better persistence – Ball can be a single point • Obstacles – Buttons, knobs, and options! Oh, my! – Trace “ghosting” – Flickering Trace artifacts Software • Plotting points • Ball movement – Velocity & angle variables • Collisions – Checks against ball/paddles/boundary • Angle of reflection is affected by angle and position of collision • Embellishment Software • Main loop switches between graphics and game logic – Timing used to schedule processes • ISR – ADC, timer overflow • SPI Game Over
