B&B Electronics Parallel Printer Card PIOC Manuel d'utilisateur télécharger pdf (Page 27)

GHI Electronics,LLC USBwiz User Manual

1. USBwiz Functions

Example: This example is taken from USB HID specifications. It assumes a 4-bytes

HID report for a keyboard:

Key Event Modifier Byte Array Array Array Comment

None 00000000B 00H 00H 00H

RALT down 01000000 00 00 00

None 01000000 00 00 00

Report current key

state even when no

new key events.

A down 01000000 04 00 00

X down 01000000 04 1B 00

B down 01000000 04 05 1B

Report order is

arbitrary and does

not reflect order of

events.

Q down 01000000 01 01 01

Phantom state.

Four Array keys

pressed. Modifiers

still reported.

A up

01000000 05 14 1B

B and Q up 01000000 1B 00 00

Multiple events in

one report. Event

order is

indeterminate.

None 01000000 1B 00 00

RALT up 00000000 1B 00 00

X up 00000000 00 00 00

Mouse

Most mice return 4 bytes in the HID report which are decoded as follows:

Byte0

5 bits 3 bits

Byte1 Byte2 Byte3

Reserved Buttons

b0 left

b1 right

middle

X position Y position Scroll Position

Constant Variable Variable Variable Variable

NULL Absolute Relative to

the last

position

Relative to

the last

position

Relative to the last

position

0 Up=0

Down=1

-127 +127 -127 +127 -127 +127

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B&B Electronics Parallel Printer Card PIOC Manuel d'utilisateur Page 27

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