Universal serial bus (USB) communication systems and methods

摘要

Universal serial bus (USB) communication systems and methods are disclosed. In particular, aspects of the present disclosure optimize polling and scheduling of bulk data transfers from bulk endpoints connected through a USB connection. By reducing the amount of polling, and by favoring endpoints that are known to have data to transfer, unnecessary signaling is avoided. Reduction in signaling allows more data to be transferred in a shorter amount of time. Reducing the time required for a data transfer may allow for low power modes to be used, which in turn further saves power.

主权项

1. A method of controlling data transfer through a universal serial bus (USB) connection, comprising:
receiving, at a control system residing within the host coupled to the USB connection, a negative indication from at least one of a plurality of bulk endpoints indicating that the at least one of the plurality of bulk endpoints does not have data ready to transfer; and prioritizing, at the control system, bulk data transfers through the USB connection to other endpoints of the plurality of bulk endpoints based on the negative indication by skipping at least one polling of the at least one of the plurality of bulk endpoints associated with the negative indication.