Abstract: System, methods, and apparatus are described that facilitate signaling between devices over a single bi-directional line. In an example, the apparatus couples a first device to a second device via a single bi-directional line, indicates initiation of a first action, initiated at the first device, by sending a first single transition on the single bi-directional line from the first device to the second device, and indicates initiation of a second action, initiated at the second device, by sending a second single transition on the single bi-directional line from the second device to the first device. In another example, a first device initiates a first action, indicates initiation of the first action by generating a first event on a single bi-directional line, and receives an indication of a second action initiated at a second device by observing a second event on the single bi-directional line.

Abstract: System, methods, and apparatus are described that facilitate signaling between devices over a single bi-directional line. In an example, the apparatus couples a first device to a second device via a single bi-directional line, indicates initiation of a first action, initiated at the first device, by sending a first single transition on the single bi-directional line from the first device to the second device, and indicates initiation of a second action, initiated at the second device, by sending a second single transition on the single bi-directional line from the second device to the first device. In another example, a first device initiates a first action, indicates initiation of the first action by generating a first event on a single bi-directional line, and receives an indication of a second action initiated at a second device by observing a second event on the single bi-directional line.

Abstract: A finite state machine is provided that both serializes virtual GPIO signals and deserializes virtual GPIO signals. The finite state machine frames the serialized virtual GPIO signals into frames each demarcated by a start bit and an end bit.

Abstract: A finite state machine is provided that both serializes virtual GPIO signals and deserializes virtual GPIO signals. The finite state machine frames the serialized virtual GPIO signals into frames each demarcated by a start bit and an end bit.

Abstract: A finite state machine is provided that both serializes virtual GPIO signals and deserializes virtual GPIO signals responsive to cycles of an external clock. The finite state machine frames the serialized virtual GPIO signals into frames each demarcated by a start bit and an end bit.

Abstract: In various aspects a host processor and a touchscreen controller may concurrently process a signal sent by a touch transducer when a touch is detected. A touch signal sent directly from a touch transducer may be formatted into a calibrated touch signal that the host processor can process. The calibrated touch signal may allow the host processor to receive and process touch signals from transducers and touchscreens from various manufacturers. The touchscreen controller and the host processor may each independently assess the touch-processing state. The touch-processing state may be set to one of a plurality of “states,” and the plurality of states may have rules for transitioning between the states. In various aspects, a host processor and a touchscreen controller may dynamically set, among other things, the scanning rate and resolution of a touchscreen panel based on the touch-processing state.

Abstract: A finite state machine is provided that both serializes virtual GPIO signals and deserializes virtual GPIO signals responsive to cycles of an external clock. The finite state machine frames the serialized virtual GPIO signals into frames each demarcated by a start bit and an end bit.