Method and device for managing a key matrix, corresponding computer program product and storage device

A computer readable and non-transient storage medium storing a computer program comprising a set of instructions executable by a computer or a processor to implement a method for managing, by a device, a matrix of keys comprising at least one row and at least two columns, each key making it possible, when it is pressed, to short-circuit a row and a column of said matrix, the method comprising at least one iteration of a scan phase comprising the following steps performed by the device for each of the rows processed successively:

• writing a predetermined logic value to the row;
• and
• for each column, reading a logic value on the column and determining whether the column is short-circuited with the row, by comparison between the logic value read and the predetermined logic value,
• wherein, for each of the rows processed successively:
• the step of writing the predetermined logic value to the row is performed during a predetermined time slot;
• during said predetermined time slot, for each of said columns:
• the step of reading a logic value on the column is performed during a first part of said predetermined time slot;
• and
• the scan phase comprises an additional step of writing the predetermined logic value to the column during a second part of said predetermined time slot, the duration of said predetermined time slot being equal to the sum of the durations of the first and second parts.

A device for managing a matrix of keys comprising at least one row and at least two columns, each key making it possible, when it is pressed, to short-circuit a row and a column of said matrix, the device comprising:

• means for scanning, which carries out at least one iteration of a scan phase, the means for scanning comprising the following means, activated for each of the rows processed successively:
• means for writing a predetermined logic value to the row;
• and
• means for reading a logic value on each column to determine whether the column is shorted-circuited with the row, by comparison between the logic value read and the predetermined logic value,
• wherein the means for scanning comprise additional means for writing, and wherein, for each of the rows processed successively:
• the means for writing the predetermined logic value to the row are activated during a predetermined time slot;
• during said predetermined time slot, for each of said columns:
• the means for reading the logic value on the column are activated during a first part of said predetermined time slot;
• the additional means for writing are activated during a second part of said predetermined time slot to write the predetermined logic value to the column, the duration of the predetermined time slot being equal to the sum of durations of the first and second parts.