CM103 查看數據表（PDF） - C-Media Electronics

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产品描述 (功能)

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CM103

16-Bit Stereo USB Audio Controller

C-Media Electronics 

CM103+

USB Stereo Audio Chip for Digital Speakers Application

6.3 HID FEATURE

HID feature is provided by CM103+ so user setting to Volume-Up, Volume-Down,

Playback-Mute button pin, and the Digital-Rotary-Encoder for Volume Control is

reported to the host to synchronize host side setting.

6.3.1 WHAT’S HID

USB protocols can configure devices at startup or when they are plugged in at run time.

These devices are broken into various device classes. Each device class defines the

common behavior and protocols for devices that serve similar functions. The HID

(Human Interface Device) class is one of the device classes.

The HID class consists primarily of devices that are used by humans to control the

operation of computer systems. Typical examples of HID class devices include:

- Keyboards and pointing devices, for example: mouse, trackballs, and

joysticks.

- Front-panel controls, for example: knobs, switches, buttons, and sliders.

- Controls that might be found on devices such as VCR remote controls,

games or simulation devices, for example: data gloves, throttles, and steering

wheels.

- Devices that may not require human interaction but provide data in a similar

format to HID class devices, for example: bar-code readers, thermometers,

or voltmeters.

6.3.2 HID DESCRIPTOR

HID Interface Descriptor

Offset

Field

Size Value (Hex)

Description

0

bLength

1

09

Size of this descriptor: 9 byte

1 bDescriptorType 1

04

INTERFACE descriptor type

2 bInterfaceNumber 1

02

Number of Interface

3 bAlternateSetting 1

00

alternate 0

Date: 09/25/2005

- 16 -

Version: 1.01

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