AUTO-CONFIGURATION OF USB HOST AND PERIPHERAL ROLES IN AN OPTICAL FRONT-END MODULE
An optical front end, OFE, module (200) for use in an optical wirelesscommunication, OWC, system (100), the OFE module (200) comprising: an optical transmitter (210) comprising a light source (211) for transmitting optical signals; an optical receiver (220) comprising a light sensor (221) for receiv...
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Zusammenfassung: | An optical front end, OFE, module (200) for use in an optical wirelesscommunication, OWC, system (100), the OFE module (200) comprising: an optical transmitter (210) comprising a light source (211) for transmitting optical signals; an optical receiver (220) comprising a light sensor (221) for receiving optical signals;a control circuit (230) configured to: connect to a USB On-The-Go, OTG, interface (231) comprising a differential data path (232) and an ID signal (233); route signals received on the differential data path (232) to an input of the optical transmitter (210) and signals received on an output of the optical receiver (220) to the differential Q data path (232); control a power-up sequence of the OFE module (200), which defines that the OFE module (200) is initialized by powering up the optical receiver (220) first for detecting an optical test signal within an ID detection period; set the ID signal (233) to GND and latch the ID signal (233) when the optical test signal is received within the ID detection period; set the ID signal (233) to Float and latch the ID signal (233) when no optical test signal is received within the ID detection period. |
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