Teledyne-lecroy Voyager Exerciser Generation Script Language Manua Manual de usuario descargar pdf (Pagina 73)

Teledyne LeCroy Voyager USB 3.0 Exerciser Generation Script Language Reference Manual

{

Data = ...

}

AddDescriptor has the following instruction parameters:

 type: Descriptor Type as defined by the USB specification. Default value is 0.

 index: Descriptor Index as defined by the USB specification. Default value is 0.

 request type: Request type as defined by the USB specification for the request used to

retrieve the descriptor. Default value is 0, for Standard type.

 recipient: Request recipient as defined by the USB specification for the request used to

retrieve the descriptor. Default value is 0, for Device.

 language id: Language ID as defined by the USB specification, for String descriptors only.

Default value is 0.

 bRequest: bRequest value as defined by the USB specification for the request used to

retrieve the descriptor. Default value is 6, for standard GET_DESCRIPTOR request.

 device index: Specifies the zero-based index of the device for which to add descriptor.

Default value is 0. Note: Current version supports only one emulated device.

The instruction accepts the data for the descriptor itself as a Packet structure variable with an

array of data. The structure has to be declared in the script, as shown in the example below.

Examples of calling the AddDescriptor instruction

# Device emulation

# Include file with descriptor structures and constant definitions

%include "Generation\Include\DeviceRequestConstants.ginc"

# Define data structure to be used with AddDescriptor.

Packet DescriptorData

{

Data : *

}

Main

{

# Start the handler task at the beginning of the script.

StartDeviceFrameworkHandler()

# Initialize device to default state and clear all descriptors.

InitDevice()

# Add required descriptors.

$DeviceDescriptorPayLoad = DeviceDescriptor

$DeviceDescriptorPayLoad

{

Length = 0x12

DescriptorType = DEVICE_DESC

bcdUSB = 0x0300

DeviceClass = 0x00

DeviceSubClass = 0x00

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