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GHI Electronics,LLC USBwiz User Manual

1. USBwiz Functions

Stage 2:

Load device descriptor into the internal Buffer,

LD 0>D

This is an optional command, since it is only used to display the internal buffer contents,

DB A

Output: Device descriptor size + Device descriptor data in the internal buffer

Load the first configuration descriptor into the internal buffer,

LD 0>C0

This is an optional command, since it is only used to display the internal buffer contents,

DB A

Output: configuration descriptor size + configuration descriptor data in the internal

buffer.

Set the desired configuration which is, in this case, the first configuration,

SC 0>1

Note that using 0 means go back to addressing mode stage.

Find the specific Interface descriptor in the previously loaded Configuration descriptor in

the internal buffer,

FI 03 01 02 00

class =HID, subclass=bootable, protocol=mouse, index=the 1st found interface

descriptor that match this criteria.

Output: The found interface descriptor size + the data

It is also possible to use the following:

FI 03 FF FF 00

class=HID subclass=don't care, protocol=don't care, index=the 1st found interface

descriptor that match this criteria.

Output: The found interface descriptor size + the data.

We will get the same result, if the device is a USB mouse with no other HID interfaces.

Set the found Interface,

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B&B Electronics Parallel Printer Card PIOC Bedienungsanleitung Seite 30