Broadcom Corporation

Glen Weaver

Sumant Ranganathan

Tianhao Li

John S Walley

David A Sobel

Pi Sheng Chang

Federico Santiago Cattivelli

Kerrynn Jacques De Roche

Robert S French

Viresh Rustagi

Bhupesh Kharwa

Satish Vithal Joshi

Joyjit Nath

Gareld H Banta

Ian Atkinson

Control circuitry for a touch panel includes a touch panel interface, a memory comprising touch positioning logic, and a controller in communication with the memory and the touch panel interface. The controller is operable, when the touch positioning logic is executed, to perform selected processing of the touch panel, including scanning a touch panel and determining a touch panel blob resulting from a touch, obtaining blob characteristics of the touch panel blob, and determining a position of the blob relative to the touch panel based on the blob characteristics. The blob characteristics can be adjusted to more accurately position the blob in circumstances where the blob is located near the edge of the touch panel, is in close proximity to another blob, or when the touch panel has variation in the received signal noise.

High-accuracy touch positioning for touch panels

Systems and methods are provided that allow a touch sensor, such as a mutual capacitive touch panel, to switch from an operative transmit (TX) frequency at which the mutual capacitive touch panel is driven to an alternative TX frequency. When switching to an alternative TX frequency, an alternative baseline capacitance value corresponding to the alternative TX frequency may be utilized to determine whether a touch event has occurred on the mutual capacitive touch panel. Frame scans can be repeatedly performed at the operative TX frequency and the alternative TX frequency in rapid succession, and an average difference of the frame scans can be calculated and utilized to generate the alternative baseline capacitance value which may be insensitive to sudden ambient changes and moving touch events affecting the mutual touch capacitive panel.

Baseline recalculation after frequency reconfiguration of a mutual capacitive touch controller

Asymmetric scanning logic implements asymmetric panel scanning by scanning some rows on a touch panel more frequently than other rows. Note that although an entire row at a time may be driven, if only particular pixels in the row are of interest (e.g., included in any region of interest for focused asymmetric scanning), then circuitry may power down the receivers for the columns in which the pixels exist to save power. The asymmetric scanning logic facilitates focused attention to specific areas of interest on the touch panel, to compensate, for example, for high noise or low signal strength in those areas of interest.

Asymmetric multi-row touch panel scanning

A method and apparatus for debugging are described. In one embodiment, a target construct is selected for debugging. Data related to an operation of the target construct is accessed by a debug construct in real time. At least a portion of this data is retrieved without disturbing the operation of the target construct to debug the target construct.

Multi-channel, multi-service debug

Growing community of inventors

San Jose, CA, United States of America

Glen Weaver