Storing baseline information in EEPROM
First Claim
1. A method for establishing no-event baseline sensor output values for sensors in an event sensor panel without corruption by touch or hover events on or about the sensor panel, comprising:
- during boot-up of a sensor panel subsystem,performing a scan of the sensor panel to obtain new sensor output values,computing offsets for use in generating normalized baseline sensor output values,generating the normalized baseline sensor output values,computing a first value as a function of one or more new sensor output values above the normalized baseline sensor output values,computing a second value as a function of one or more new sensor output values below the normalized baseline sensor output values,determining whether the second value is greater than the first value by a predetermined margin,re-scanning the sensor panel if it is determined that the second value is not greater than the first value by the predetermined margin, andrecapturing the normalized baseline sensor output values if it is determined that the second value is greater than the first value by the predetermined margin.
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Abstract
Pre-stored no-touch or no-hover (no-event) sensor output values can initially be used when a sensor panel subsystem is first booted up to establish an initial baseline of sensor output values unaffected by fingers or other objects touching or hovering over the sensor panel during boot-up. This initial baseline can then be normalized so that each sensor generates the same output value for a given amount of touch or hover, providing a uniform response across the sensor panel and enabling subsequent touch or hover events to be more easily detected. After the initial normalization process is complete, the pre-stored baseline can be discarded in favor of a newly captured no-event baseline that may be more accurate than the pre-stored baseline due to temperature or other variations.
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Citations
9 Claims
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1. A method for establishing no-event baseline sensor output values for sensors in an event sensor panel without corruption by touch or hover events on or about the sensor panel, comprising:
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during boot-up of a sensor panel subsystem, performing a scan of the sensor panel to obtain new sensor output values, computing offsets for use in generating normalized baseline sensor output values, generating the normalized baseline sensor output values, computing a first value as a function of one or more new sensor output values above the normalized baseline sensor output values, computing a second value as a function of one or more new sensor output values below the normalized baseline sensor output values, determining whether the second value is greater than the first value by a predetermined margin, re-scanning the sensor panel if it is determined that the second value is not greater than the first value by the predetermined margin, and recapturing the normalized baseline sensor output values if it is determined that the second value is greater than the first value by the predetermined margin.
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2. An apparatus for establishing no-event baseline sensor output values for sensors in an event sensor panel without corruption by touch or hover events on or about the sensor panel, comprising:
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a panel processor programmed for, during boot-up of a sensor panel subsystem, performing a scan of the sensor panel to obtain new sensor output values, computing offsets for use in generating normalized baseline sensor output values, generating the normalized baseline sensor output values, computing a first value as a function of one or more new sensor output values above the normalized baseline sensor output values, computing a second value as a function of one or more new sensor output values below the normalized baseline sensor output values, determining whether the second value is greater than the first value by a predetermined margin, re-scanning the sensor panel if it is determined that the second value is not greater than the first value by the predetermined margin, and recapturing the normalized baseline sensor output values if it is determined that the second value is greater than the first value by the predetermined margin. - View Dependent Claims (3)
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4. A non-transitory computer-readable storage medium comprising program code for establishing no-event baseline sensor output values for sensors in an event sensor panel without corruption by touch or hover events on or about the sensor panel, the program code for causing performance of a method comprising:
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during boot-up of a sensor panel subsystem, performing a scan of the sensor panel to obtain new sensor output values, computing offsets for use in generating normalized baseline sensor output values, generating the normalized baseline sensor output values, computing a first value as a function of one or more new sensor output values above the normalized baseline sensor output values, computing a second value as a function of one or more new sensor output values below the normalized baseline sensor output values, determining whether the second value is greater than the first value by a predetermined margin, re-scanning the sensor panel if it is determined that the second value is not greater than the first value by the predetermined margin, and recapturing the normalized baseline sensor output values if it is determined that the second value is greater than the first value by the predetermined margin.
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5. A non-transitory computer-readable storage medium comprising program code for establishing no-event baseline sensor output values for sensors in an event sensor panel without corruption by touch or hover events on or about the sensor panel, the program code for causing performance of a method comprising:
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during boot-up of a sensor panel subsystem, performing a scan of the sensor panel to obtain new sensor output values, computing offsets for use in generating normalized baseline sensor output values, generating the normalized baseline sensor output values for the sensors, computing a first value as a function of one or more new sensor output values above the normalized baseline sensor output values, and computing a second value as a function of one or more new sensor output values below the normalized baseline sensor output values; making a first determination as to whether the second value is less than the baseline sensor output value for any sensor by a first amount; and recapturing new baseline sensor output values if it is determined that the second value is less than the baseline sensor output value for any sensor by the first amount. - View Dependent Claims (6, 7, 8, 9)
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Specification