Interrupt reduction method in touch screen controller
US8698756B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Nov 5, 2008 |
| Grant date | Apr 15, 2014 |
| Priority date | — |
| Expiry date | Mar 31, 2030 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F3/0416
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
Integration of a FIFO memory, FIFO threshold and a timer, along with the other components of a touch screen system allows the number of interrupts to the touch screen controller to be reduced while allowing all point data to be acquired and preserved. In the first touch-detect event, an interrupt is issued to inform the host. The touch screen controller then automatically acquires data as long as touch is detected without host intervention. A FIFO threshold defines the minimum number of data points in FIFO memory before it issues an interrupt to inform the host that data is ready to be fetched. The timer is started once touch is detected. On every single data acquired, the timer is reset. In the event where touch is no longer detected, the timer keeps on counting until the time-up limit is reached. In this event, the touch screen controller will issue an interrupt informing the host the pen is lifted. The host then checks whether there is still data left in FIFO memory to be read.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.