Virtualization of hardware user-interface using a shared...

Details Virtualization of hardware user-interface using a shared... Virtualization of hardware user-interface using a shared...

2006-09-12

2006-09-12

Mehgrpour, Naghmeh (Melody) (Department: 2617)

Telecommunications

Radiotelephone system

Message storage or retrieval

C455S550100

Reexamination Certificate

active

07107044

ABSTRACT:
A feature phone has two processors that share a key pad for user input. The key pad is attached to a base-band processor and sends an interrupt to a user-hardware-interrupt UHI driver running on the base-band processor when the user presses a key. When a hot switch indicates that the local base-band processor has the focus, a key-press event is sent to the local kernel to be sent to programs on the base-band processor. When the hot switch indicates that a remote applications processor has the focus, a message for the event is written through a shared-memory interface to a shared memory on the applications processor. A shared mailbox is written with the message length, triggering a mailbox-interrupt to the applications processor. A virtual UHI driver running on the applications processor reads the event message from the shared memory and passes key-press information to programs on the applications processor.

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