Method and system for identifying a peripheral device by a high priority device-specific notification handler
View Patent ↗Method and system for latency-independent peripheral device identification. The computer system receives an interrupt from a peripheral device via a communications port. In response, an interrupt notification message is posted to alert a notification handler, and compliant peripheral class is determined. The voltage on a device may sense pin of the communications port for this determination. If the interrupt is indicative of the compliant peripheral class and the communications port is inactive, the port is opened, and an inquiry is sent and a response is received. If a response is received within a predetermined time period, an identification notification message is posted based on the response including information for classifying the peripheral device, so that a software handler registered with the operating system can handle the identification notification message when the software handler receives it. Thus, no time-critical interrupt response requirement is imposed for its successful operation.
1. A method for identifying a peripheral device coupled to a computer system, said method comprising:
receiving a message from said peripheral device, said peripheral device being coupled to a communications port of said computer system;
responsive to said message, posting a notification to alert a high priority device-specific notification handler, said high priority device-specific notification handler having a higher priority than a system notification handler and being capable of directly servicing said message from said peripheral device without involving said system notification handler; and
servicing said notification upon receipt thereof.
2. The method as recited in claim 1 wherein said computer system has a plurality of said high priority device-specific notification handlers installed thereon.
3. The method as recited in claim 1 further comprising triggering a default action in the event that said high priority device-specific notification handler fails to handle said notification.
4. The method as recited in claim 1 wherein said communications port is a serial communications port.
5. The method as recited in claim 1 wherein said peripheral device is a RS-232 peripheral device.
6. The method as recited in claim 1 wherein said computer system is a portable computer system.
7. The method as recited in claim 1 further comprising examining a device sense pin of said communications port to determine a voltage thereon.
8. The method as recited in claim 1 wherein said system notification handler is a HotSync interrupt notification handler.
9. The method as recited in claim 1 wherein said servicing said notification is performed without receiving additional signals from said peripheral device subsequent receiving said message.
10. The method as recited in claim 1 wherein said servicing said notification is performed without detecting attachment of said peripheral device to said computer system.
11. A computer system capable of identifying a peripheral device communicatively coupled thereto, said computer system comprising:
a processor for posting a notification to alert a high priority device-specific notification handler in response to a message received from a peripheral device, said high priority device-specific notification handler having a higher priority than a system message handler and being capable of directly servicing a message from said peripheral device without involving said system notification handler;
a memory coupled to said processor; and
a communications port coupled to said processor, said communications port for receiving said message from said peripheral device.
12. The computer system as recited in claim 11 further comprising a plurality of said high priority device-specific notification handlers installed thereon.
13. The computer system as recited in claim 11 wherein said processor is operable to trigger a default action in the event that said high priority device-specific notification handler fails to handle said message.
14. The computer system as recited in claim 11 wherein said communications port is a serial communications port.
15. The computer system as recited in claim 11 wherein said peripheral device is a RS-232 peripheral device.
16. The computer system as recited in claim 11 further comprising a display screen.
17. The computer system as recited in claim 11 wherein said communication port comprises a device sense pin to determine a voltage thereon.
18. The computer system as recited in claim 11 wherein said system notification handler is a HotSync interrupt notification handler.
19. The computer system as recited in claim 11 wherein said communications port does not receive any additional signals from said peripheral device subsequent receiving said message for purposes of servicing said message.
20. A portable electronic device capable of identifying a peripheral device communicatively coupled thereto, said portable electronic device comprising:
a processor for posting a notification to alert a high priority device-specific notification handler in response to a message received from a peripheral device, said high priority device-specific notification handler having a higher priority than a system message handler and being capable of directly servicing a message from said peripheral device without involving said system notification handler;
a memory coupled to said processor; and
a communications port coupled to said processor, said communications port for receiving said message from said peripheral device.
21. The portable electronic device as recited in claim 20 further comprising a plurality of said high priority device-specific notification handlers installed thereon.
22. The portable electronic device as recited in claim 20 wherein said processor is operable to trigger a default action in the event that said high priority device-specific notification handler fails to handle said message.
23. The portable electronic device as recited in claim 20 wherein said communication port comprises a device sense pin to determine a voltage thereon.
24. The portable electronic device as recited in claim 20 wherein said system notification handler is a HotSync interrupt notification handler.
25. The portable electronic device as recited in claim 20 wherein said communications port does not receive any additional signals from said peripheral device subsequent receiving said message for purposes of servicing said message.