Keypad de-bouncing apparatus and method
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United States of America Patent
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Mar 26, 2013
Grant Date -
Jan 6, 2011
app pub date -
Sep 13, 2010
filing date -
Nov 14, 2007
priority date (Note) -
Expired
status (Latency Note)
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Abstract
An apparatus and method for de-bouncing keypad inputs is disclosed including interrupting a processor upon detecting a key press, reading input signals from the key pad to determine an initial port value and starting a timer. A keypad interrupt is disabled and processing resumes until expiration of the timer. The timer interrupts the processor and the input signals are read a second time and combined with the initial port value to determine a key identifier. The timer is started again and processing resumes. Upon expiration of the timer the processor checks for key release. If release is not detected, the timer is again started. If release occurs, the timer is disabled and the keypad interrupt is enabled.
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