Abstract: An input device with switchable sensor configurations. In one embodiment, the input device can switch between a sensor configuration in which each of its sensor elements is enabled to sense input and a sensor configuration in which only a subset of its sensor elements are enabled to sense input. In another embodiment, the input device can switch between a sensor configuration in which each of its sensor elements is enabled to sense input and a sensor configuration in which one or more groupings of its sensor elements are enabled to collectively sense input. In a further embodiment, the input device can operate in a detection mode that switches between sensor configurations to determine a position of an input.

Abstract: An audio accessory is configured to receive and store meta data from a media player, including the media asset identification and current play position. The audio accessory is configured to independently track the current play position of the media asset. When the audio accessory is disconnected from the first media player the audio accessory is configured to store the independently tracked current play position in memory. After the audio accessory is subsequently connected to a second media player, the second media player may retrieve the meta data from the audio accessory and use it to load the media asset on the second player and resume play from the stored current play position.

Abstract: Handheld electronic devices are provided that contain wireless communications circuitry. The wireless communications circuitry may include an antenna. A radio-frequency coupler may be coupled to the antenna. Transceiver circuitry may be used to transmit and receive radio-frequency signals through the coupler and the antenna. A reflected power detection circuit may be connected to the coupler. When the transceiver circuitry transmits radio-frequency signals, some of the signals are reflected back from the antenna into the coupler. The coupler directs the reflected antenna signals into the reflected power detection circuit. Processing circuitry may analyze a reflected power signal from the reflected power detection circuit to determine whether operation of the antenna is being disrupted by the placement of a user's hand over the antenna or other proximity effects. If antenna operation is being disrupted, the user may be alerted or other suitable actions may be taken.

Abstract: An audio accessory is configured to receive and store meta data from a media player, including the media asset identification and current play position. The audio accessory is configured to independently track the current play position of the media asset. When the audio accessory is disconnected from the first media player the audio accessory is configured to store the independently tracked current play position in memory. After the audio accessory is subsequently connected to a second media player, the second media player may retrieve the meta data from the audio accessory and use it to load the media asset on the second player and resume play from the stored current play position.

Abstract: Electronic devices may be provided with audio circuits and circuitry configured to support communications and test mode operations. During normal operation, a connector such as an audio connector may be inserted into a connector port in an electronic device. The audio connector may be associated with a headset or other accessory and may be used to carry audio signals. During test mode operations, a tester may be coupled to the connector port using an audio connector. The tester may generate voltages, resistances, time-varying signals, or other input that directs the device to configure switching circuitry to support testing. Monitoring circuitry in the device may be used to detect input from the tester. In response to detected input from the tester, the switching circuitry may be adjusted to couple a control circuit that supports test mode operations to the audio connector.

Abstract: Electronic devices may be provided with audio circuits and controller circuitry configured to support test mode operations. A connector such as a reversible connector may be inserted into a mating device connector in an electronic device. The reversible connector may be connected to the device connector in either a normal orientation or a reversed orientation in which the reversible connector is rotated 180° with respect to the normal orientation. During test mode operations, a tester may be coupled to the device connector using the reversible connector. The tester may generate voltages, resistances, time-varying signals, or other input that directs the device to configure switching circuitry to support testing. Monitoring circuitry in the device may be used to detect input from the tester. In response to detected input from the tester, the switching circuitry may be adjusted to couple the controller to the device connector.

Abstract: Electronic devices may be provided with audio circuits and circuitry configured to support communications and test mode operations. During normal operation, a standards-compliant connector such as an audio connector may be inserted into a connector port in an electronic device. The audio connector may be associated with a headset or other accessory and may be used to carry audio signals. During test mode operations, a nonstandard test connector may be inserted into the connector port. The electronic device may detect the presence of the nonstandard connector and may direct the electronic device to operate in a testing mode.

Abstract: Handheld electronic devices are provided that contain wireless communications circuitry. The wireless communications circuitry may include an antenna. A radio-frequency coupler may be coupled to the antenna. Transceiver circuitry may be used to transmit and receive radio-frequency signals through the coupler and the antenna. A reflected power detection circuit may be connected to the coupler. When the transceiver circuitry transmits radio-frequency signals, some of the signals are reflected back from the antenna into the coupler. The coupler directs the reflected antenna signals into the reflected power detection circuit. Processing circuitry may analyze a reflected power signal from the reflected power detection circuit to determine whether operation of the antenna is being disrupted by the placement of a user's hand over the antenna or other proximity effects. If antenna operation is being disrupted, the user may be alerted or other suitable actions may be taken.

Abstract: Methods, systems, and computer program products for multiplexing a target communication port to provide an additional independent communication channel sharing at least some portion of hardware associated with the target port. Typically, a device, such as a disk drive, is also connected to the target port. An out-of-band signal indicates when the shared hardware is being used to provide the additional independent communication channel to avoid interfering with the target port device. A communication board with one or more communication ports may be coupled to the additional independent communication channel for communicating data from the target system to other devices or systems, such as a host system, through the communication board. In communicating with the target system, the communication board may emulate a particular interface that is supported by the target port. One type of host system may be a development system for designing, testing and debugging the target system.

Abstract: Methods, systems, and computer program products for multiplexing a target communication port to provide an additional independent communication channel sharing at least some portion of hardware associated with the target port. Typically, a device, such as a disk drive, is also connected to the target port. An out-of-band signal indicates when the shared hardware is being used to provide the additional independent communication channel to avoid interfering with the target port device. A communication board with one or more communication ports may be coupled to the additional independent communication channel for communicating data from the target system to other devices or systems, such as a host system, through the communication board. In communicating with the target system, the communication board may emulate a particular interface that is supported by the target port. One type of host system may be a development system for designing, testing and debugging the target system.

Abstract: Methods, systems, and computer program products for multiplexing a target communication port to provide an additional independent communication channel that shares at least some portion of hardware otherwise associated with the target port. Typically, a target port device, such as a disk drive, is also connected to the target port. An out-of-band signal indicates when the shared hardware is being used to provide the additional independent communication channel to avoid interfering with the target port device. A communication board with one or more communication ports may be coupled to the additional independent communication channel for communicating data from the target system to other devices or systems, such as a host system, through the communication board. In communicating with the target system, the communication board may emulate a particular communication interface that is supported by the target port.