COMPRESSED REPORT DESCRIPTORS FOR USB DEVICES

• US 20080133784A1
• Filed: 02/07/2008
• Published: 06/05/2008
• Est. Priority Date: 09/24/2004
• Status: Active Grant

• Current Assignee: Cypress Semiconductor Corporation (Infineon Technologies AG)
• Original Assignee: Cypress Semiconductor Corporation (Infineon Technologies AG)
• Inventors: Beard, Paul, Woodings, Ryan Winfield
• Granted Patent: US 7,765,354 B2
• Time in Patent Office: Days
• US Class Current: 710/19
• CPC Class Codes: G06F 13/385 for adaptation of a particular data processing system to different peripheral devices
• CPC Class Codes: H04W 88/08 Access point devices
• CPC Class Codes: Y02D 10/00 Energy efficient computing, e.g. low power processors, power management or thermal management
• CPC Class Codes: Y02D 30/70 in wireless communication networks

Abstract

A method and apparatus for creating USB peripheral device report descriptors: A short, compressed, report descriptor is stored in a peripheral device. This short report descriptor is transmitted to a USB wireless bridge and combined with templates stored in the bridge to create a USP report descriptor. Power is saved because less time is required to transmit the short report descriptor than would be required to transmit a full USB report descriptor. Hardware is also saved in the peripheral device since less memory is required to store the short report descriptors as compared to storing a full USB report descriptor.

Claims

1. A method for creating a USB report descriptor for a USB device, said method comprising:

obtaining from said USB device a first short report descriptor, said first short report descriptor including a template indicator; and

creating a full-sized USB report descriptor for said USB device based in part on information in said first short report descriptor and based in part on information in a template identified by said template indicator.

2. The method of claim 1 wherein said USB device is a first USB device and said method, further comprises receiving from a second USB device a second short report descriptor containing the same template indicator as in the first short report descriptor received from said first USB device, said second short report descriptor being different from the first short report descriptor.

3. The method of claim 1, where said first short report descriptor is obtained by a bridge and said first short report descriptor is saved in non-volatile memory in said bridge.

4. The method of claim 3, further comprising creating the full-sized report descriptor based in part on the short report descriptor stored in non-volatile memory.

5. The method of claim 1, wherein said first short report descriptor is obtained from a USB device by a wireless USB bridge.

6. The method of claim 1, wherein said first short report descriptor has information specific to said USB device.

7. A USB system comprising:

a wireless USB device adapted to transmit a short report descriptor including a template indicator; and

a USB bridge adapted to receive said short report descriptor from said wireless USB device and to create a full-sized USB report descriptor for said USB device based in part on said report descriptor and in part based upon a template identified by said template indicator.

8. The USB system in claim 7 including a computer adapted to receive said full-sized report descriptor from said wireless USB bridge.

9. The system of claim 7, wherein said characteristics of said wireless USB device are described by the combination of said short USB report descriptor and the template identified by said template identifier.

10. The system of claim 8 wherein said short report descriptor is stored in said USB device in non-volatile memory.

11. The system of claim 7, wherein said template is stored in said USB bridge.

12. The system of claim 7, wherein said USB bridge stores the compressed report descriptor in non-volatile memory located within said USB bridge.

13. The system of claim 12, wherein the wireless bridge creates a second full-sized report descriptor based in part on the short report descriptor stored in said non-volatile memory.

14. A USB device adapted to transmit a short USB report descriptor including a USB template identifier, said short USB report descriptor together with information from a template identified by said template identifier containing sufficient information to generate a USB report descriptor for said USB device.

15. The USB device of claim 14 wherein said short USB report descriptor is transmitted wirelessly.

18. The USB device of claim 14 wherein said USB device is adapted to transmit said short USB report descriptor including a USB template identifier wirelessly to a USB bridge.

16. A USB bridge having stored therein at least one USB report template, said USB bridge being adapted to receive a short USB report descriptor and to generate a USB report descriptor by combining said short USB report descriptor with said USB report template.

17. The USB bride of claim 16 wherein said short USB report descriptor is received wirelessly.

19. The USB bridge of claim 16 wherein said USB device is adapted to receive said short USB report descriptor including a USB template identifier from a USB device.