Using USB suspend/resume to communicate information through a USB device
US8327048B2 · kind B2 · utility
2Cited by
4References
19Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jan 27, 2009 |
| Grant date | Dec 4, 2012 |
| Priority date | — |
| Expiry date | Feb 18, 2030 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F13/426
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
Methods and systems for communicating information through a USB device using suspend/resume states are presented. A USB host stops transmitting Start-of-Frame (SOF) packets to a USB device, causing the USB device to enter a sleep/suspend state. The USB host then restarts the transmission of SOF packets to trigger the USB device back into a normal/resume state. The USB host repeats this process in a temporal pattern corresponding to a message, such that a circuit monitoring the USB device can determine the message.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.