Method and device for managing a key matrix, corresponding computer program product and storage device
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United States of America Patent
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Jun 21, 2016
Issued Date -
N/A
app pub date -
Oct 25, 2012
filing date -
Oct 28, 2011
priority date (Note) -
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Abstract
A method for managing, by device, a matrix of keys, including at least one line and at least two columns, each key making short circuiting a line and a column when pressed. The method includes a sweeping phase, including, for each line: writing a predetermined logic value in the line; and for each column, reading a logic value in the column and comparing the read logic value and the predetermined logic value. For each line processed: the writing step is carried out during a predetermined time interval. For each column, the reading step is carried out during a first portion of the time interval. The sweeping phase further includes, for each column, writing the predetermined logic value in the column during a second portion of the predetermined time interval. The predetermined time interval is equal to the sum of the durations of the first and second portions.
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