Video overlay buffer mirrored through a shared mailbox...

Details Video overlay buffer mirrored through a shared mailbox... Video overlay buffer mirrored through a shared mailbox...

2007-10-30

2007-10-30

Kincaid, Lester G. (Department: 2617)

Telecommunications

Transmitter and receiver at same station

Radiotelephone equipment detail

56

Reexamination Certificate

active

10904337

ABSTRACT:
A feature phone has two processors that share a display. The display is attached to an applications processor that has a frame buffer for refreshing the display. A base-band processor also runs programs that generate graphics data that is written to a base-band frame buffer. Updates to the base-band frame buffer are sent through a shared-memory interface to a shared memory, and a shared mailbox is written with the message length, triggering a mailbox-interrupt to the applications processor. The applications processor reads the message from the shared memory and updates a copied frame buffer. An overlay engine uses the copied frame buffer to refresh the display when the base-band processor has the focus, or to refresh a smaller base-band window that covers a portion of the display, leaving the rest of the display area for applications-processor graphics data. Rapid switching between the copied and local frame buffer is possible.

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