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EE292 Fall2012 Awesome Project: Keypad Reader

EE292 Fall2012 Awesome Project: Keypad Reader. Brendan Morris 12/06/2012. Abstract/Goal/Motivation/Introduction. Accept user input from a 9 digit keypad This should be non-blocking to allow the processor to do other calculations Output key is illuminated on an 7-segment LED . Description .

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EE292 Fall2012 Awesome Project: Keypad Reader

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  1. EE292 Fall2012Awesome Project:Keypad Reader Brendan Morris 12/06/2012

  2. Abstract/Goal/Motivation/Introduction • Accept user input from a 9 digit keypad • This should be non-blocking to allow the processor to do other calculations • Output key is illuminated on an 7-segment LED

  3. Description • Usage: A user presses on a single keypad button and the button that is pressed gets displayed on the LED array • Keypad numbering • Keypad is interrupt driven • Must set keypad to pulse operation and have the AND enabled interrupt button active • Number of the pressed key is written to the 7-segment display

  4. Implementation • Hardware • External Keypad • 7-segmentLED • Enable/initialize external interrupt • Main program waits for key press • On key press • Run external interrupt service routine (ISR) • Poll keypad to find which key was pressed • Output number of key pressed to illuminate 7-segment display • Issues/subtleties • Still have to poll keys even under interrupt (software decoding) • Must be sure to enable/disable interrupts during ISR • Software design

  5. Results Demo • <show a movie here of your project in action> • http://youtu.be/bi9vrCkJWHg

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