USB xHCI中断_android xhci短包

1. xHCI Interrupters

An Interrupter manages events and their notification to the host. The xHCI

supports up to 1024 Interrupters. The MaxIntrs field in HCSPARAMS1

determines the Number of Interrupters implemented in the xHC. Each

Interrupter consists of an Interrupter Management Register, an Interrupter

Moderation Register and an Event Ring. Each Interrupter shall be mapped to a

single MSI or MSI-X interrupt vector. An Interrupter shall assert an interrupt if it

is enabled and its associated Event Ring contains Event TRBs that require an

interrupt.

2. Check if the xHC generated the interrupt

2.1 USB Status Register (USBSTS)