Device and method for synchronizing display and touch controller with host polling

摘要

Devices, systems, and methods are provided for coordinating the interaction between a touch screen controller and a display controller in an electronic device of the type including a host processor, a touch screen controller configured to acquire capacitive measurements from a touch screen, and a display controller configured to update a display at a refresh frequency and phase. The method includes: sharing a synchronization signal between the display controller and the host processor, the synchronization signal indicative of the refresh frequency and phase; polling the touch screen controller, by the host processor, based on the synchronization signal; and in response to the polling, acquiring the capacitive measurements by the touch screen controller at a sampling rate and phase determined by the refresh frequency and phase.

主权项

1. A method for coordinating the interaction between a touch screen controller and a display controller in an electronic device of the type including a host processor, the touch screen controller configured to acquire capacitive measurements from a touch screen, and the display controller configured to update a display at a refresh frequency and phase, the method comprising:
sending a synchronization signal from the display controller to the host processor, the synchronization signal indicative of the refresh frequency and phase, the synchronization signal comprising a VSYNC signal; polling the touch screen controller, by the host processor, as triggered by the synchronization signal; and in response to the polling, acquiring the capacitive measurements by the touch screen controller at a sampling rate and phase determined by the refresh frequency and phase.