ZigBee输入设备标准V1.0：绿色、高效、多触控

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ZigBee Input Device (ZID) Standard, v1.0 ZigBee Document 10-5557r18ZB, October 24th, 2012

Page 4

2 General description

The RF4CE ZID profile defines the over-air commands and mechanisms required to allow a HID class

device to communicate with a host. The profile defines two types of device: a HID class device and a

HID adaptor. The HID class device can be used to support devices such as keyboards, mice or

touchpads and the HID adaptor can be used to communicate through a HID class driver to some PC or

other embedded host. A HID class device would be realized by either an RF4CE controller or an

RF4CE target. Conversely, a HID adaptor would only be realized by an RF4CE target since more

resources would need to be available.

The RF4CE ZID profile does not define any host side behavior beyond the HID adaptor.

2.1 Architectural components

IEEE 802.15.4

ZigBee RF4CE

(a) PC Host (b) Human Interface Device

Radio Module

IEEE 802.15.4

ZigBee RF4CE

RF4CE ZID Profile:

HID Class Device

Human Interface Device

Application Firmware

IEEE 802.15.4

ZigBee RF4CE

RF4CE ZID Profile:

HID Adaptor

HID Class Driver

Host Application Software

RF4CE ZID Profile:

HID Adaptor

Driver Stack

Virtual communication

Actual (RF) communication

RF4CE Transport Firmware

Transport Bus

RF4CE Transport Driver

HID Class Driver

Host Application Software

Wired bus communication

Figure 1 – Illustration of a HID class device and host architecture

In order to describe the architecture of the ZID profile, it is useful to fit it within the context of an

overall HID system. Figure 1 illustrates an example HID system containing a human interface device

(b) with a PC host (a) and with an embedded host (c) such as a TV. Each device and stack component

is described in the following sections. Note that not all components will be present in all

implementations.

2.1.1 Device descriptions

2.1.1.1 Human interface device

The human interface device is designed to allow a human user to control the operation of some

equipment such as a PC or a TV. Its application provides controls to the user with which they interact

to generate various stimuli, which, in turn, are converted by the HID class device into machine

recognizable commands.

ZigBee Document 10-5557r18ZB, October 24th, 2012 ZigBee Input Device (ZID) Standard, v1.0

Page 5

2.1.1.2 PC host

The PC host is typically (but not always) split into two parts: a radio module and a driver stack which

communicate through some wired transport bus, which could be, for example, USB or RS232. The

radio module may act as a proxy for the remote HID class device, informing the HID class driver of the

appropriate descriptor hierarchy for each paired device.

2.1.1.3 Embedded host

The embedded host is similar to the PC host except that the entire function will likely be integrated,

possibly on the RF4CE radio board itself. An example of an embedded host would be a TV that

supports pointing functionality.

Unlike on the PC host, the HID class driver on the embedded host does not need to support a general

HID report interpreter. Rather, the driver need only support those parts of the interpreter that will be

expected from devices supported by the embedded host.

2.1.2 Stack components

2.1.2.1 IEEE 802.15.4

The IEEE 802.15.4 PHY/MAC stack [R3] facilitates the low level RF transport.

2.1.2.2 ZigBee RF4CE

The ZigBee RF4CE stack [R1] facilitates compliance to the ZigBee RF4CE standard.

2.1.2.3 RF4CE ZID profile: HID class device

The RF4CE ZID profile HID class device allows a compliant device to communicate with a host via

the standard HID class protocol [R2] by passing report descriptors containing pertinent pieces of

information which, when interpreted by the host, indicates the desired user interaction using the human

interface device.

2.1.2.4 Human interface device application firmware

The human interface device application firmware enables the specific functionality of the device. For

example, firmware that interprets mouse movements and converts them to HID reports.

2.1.2.5 RF4CE ZID profile: HID adaptor

The RF4CE ZID profile HID adaptor serves as an interface between the RF4CE stack and the HID

class driver. The HID adaptor is responsible for establishing RF4CE and HID connections between the

host and remote RF4CE HID class devices. Once the RF4CE and HID connections are established, the

HID adaptor processes RF4CE ZID profile commands arriving from the RF4CE stack and, as

necessary, passing them to the HID class driver (possible via a wired transport) and vice versa.

2.1.2.6 RF4CE transport firmware

The RF4CE transport firmware, used together with a wired transport and the RF4CE transport driver, is

an optional embedded component that facilitates communication between the HID adaptor and the HID

class driver over a wired transport bus, such as USB or RS232. This component processes commands

received from the HID adaptor for transmission over the wired transport bus and vice versa.

ZigBee Input Device (ZID) Standard, v1.0 ZigBee Document 10-5557r18ZB, October 24th, 2012

Page 8

Table 3 – Values of the response code field

Response code value

Origin

Description

0x00

GDP

Successful

0x01

GDP

Unsupported request

0x02

GDP

Invalid parameter

0x03

GDP

Configuration failure

0x40

ZID

Invalid report ID

0x41

ZID

Missing fragment

All other values

Reserved

3.1.3 Get attributes command frame

3.1.3.1 Effect on receipt

If the recipient node is not in its configuration state, for each attribute identifier included in the

command frame, the recipient node shall check that it does not correspond to an attribute with an

“aplHID” prefix (as specified in Table 6).

If it does correspond to an attribute with an “aplHID” prefix, the recipient node shall set the attribute

status field of the corresponding attribute status record to indicate an illegal request and shall not

include the attribute length and attribute value fields. It shall then move on to the next attribute

identifier.

If it does not correspond to an attribute with an “aplHID” prefix, the recipient node shall continue to

process the frame.

3.1.4 Push attributes command frame

3.1.4.1 Effect on receipt

If the recipient node is not in its configuration state, for each attribute identifier included in the

command frame, the recipient node shall check that it does not correspond to an attribute with an

“aplHID” prefix (as specified in Table 6).

If it does correspond to an attribute with an “aplHID” prefix, the recipient node shall set the response

code of the generic response command frame to indicate an invalid parameter and ignore the rest of the

frame.

If it does not correspond to an attribute with an “aplHID” prefix, the recipient node shall continue to

process the frame.

3.2 Get report command frame

The get report command frame allows the HID adaptor to request a report from a HID class device.

3.2.1 Command frame format

The get report command frame shall be formatted as illustrated in Figure 2.

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