xhci 0.5.3

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# xhci

A library to handle xHCI.

This crate provides types of the xHCI structures, such as the Registers and Contexts.
Users can use this library to implement a USB device deriver on your own OS.

This crate is `#![no_std]` compatible.

# Examples

```no_run
let mut r = unsafe { xhci::Registers::new(MMIO_BASE, mapper) };
let o = &mut r.operational;

o.usbcmd.update(|u| u.set_run_stop(true));
while o.usbsts.read().hc_halted() {}
```