linux usb audio interface

: device descriptor, configuration descriptor, string descriptor, interface descriptor, and Endpoint descriptor.(2) a USB device can be regarded as a device that provides multiple serial ports. According to the USB specification, each serial port is called an endpoint to communicate with this endpoint, we need to open the connection to this endpoint, which is the

can contain a number of endpoints. The configuration and interface is the abstraction of the USB device function , and the actual data transfer is done by the endpoint . Before using a USB device, you must indicate the configuration and interface in which it is used. This step is typically done when the device is enum

purpose services defined in the standard time period) and 16-bit "tag" segments, totaling 256 data sequences. For example, the time period "1" and "2" are used to access the encoded control registers, while the time period "3" and "4" load the left and right two audio channels respectively. The "tag" section indicates which of the other segments contains valid data. Dividing a frame into a time period makes it possible for transmission control signal

"tag" segments, A total of 256 data sequences. For example, the time periods "1" and "2" are used to access the control registers of the encoding, while the time periods "3" and "4" load the Left and Right audio channels respectively. The "tag" segment indicates which of the other segments contains valid data. Dividing frames into time periods makes it possible to transmit control signals and audio data on

needs to be configured will be different. Okay, so much about configuration. For drivers of USB devices, the following interfaces and endpoints are more important. First, let's talk about the interface. First, an interface corresponds to a USB device driver. That's right. Let's look at the example above. One

use another pointer to temporarily replace altsetting. Next we will use its members desc and endpoint. Looking back at structusb_host_interface, we can see its two members: struct usb_interface_descriptor desc and struct usb_host_endpoint * endpoint. Among them, desc is needless to say, it is the interface descriptor of this interface, and the endpoint pointer records several endpoints, they are stored in

Original article: http://www.gbunix.com/htmldata/2005_05/1/3/article_1193_1.html Access Windows partition and USB interface mobile hard drive (USB flash drive) in rh9)To access windows partition and USB interface mobile hard drive (USB