System for interfacing with an external accessory in one of two interface modes based on whether communication can be established with external accessory or not
AssigneeTelefonaktiebolaget L M Ericsson
InventorsJan Rubbmark, Jan Lind, Lars Engelin
Life of this patent
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Abstract
An electronic device operates with an external accessory by initiating a serial data communication over an accessory control bus. If data communication is established with the external accessory, the electronic device operates in a first interface mode, when one or more operating parameters are transferred over the bus. If data communication is not established, the electronic device operates in a second interface mode, when no operating parameters are transferred over the bus.
Claims24
An electronic device having a port for interfacing with an external device, comprising:
- a bus control interface that initiates data communication over an interface bus;
- and
- a controller that operates the electronic device in a first interface mode, if data communication is established with the external device, and in a second interface mode, if data communication is not established with the external device;
- in the first interface mode, the electronic device transferring at least one operating parameter to or from the external device over the interface bus, and in the second interface mode, the electronic device transferring no operating parameters to or from the external device over the interface bus.
A method of operating an electronic device having a port for interfacing with an external device, comprising:
- initiating data communication with the external device through the port;
- determining whether data communication is established with the external device;
- transferring an operating parameter between the electronic device and the external device through the port, if data communication is established with the external device;
- and
- transferring no operating parameter between the electronic device and the external device, if data communication is not established with the external device.
A method of interfacing a first port of a first electronic device to a second port of a second electronic device, comprising:
- initiating data communication between the first port and the second port;
- determining whether data communication is established;
- if established, operating the first and second electronic devices in a first interface mode that allows for the transfer of at least one operating parameter through the first and second ports;
- otherwise, operating the first and second electronic devices in a second interface mode that allows for the transfer of no operating parameters.
Dependencies are inferred from the claim text.