B&B Electronics Parallel Printer Card PIOC Uživatelský manuál stáhnout pdf (Strana 21)

GHI Electronics,LLC USBwiz User Manual

1. USBwiz Functions

MD USBWIZ Create “USBWIZ” folder

CD USBWIZ Change the current folder access to “USBWIZ” folder

Files

USBwiz allows you to open up to 4 files at the same time using file handles. This is not

how many files USBwiz can open on a drive. USBwiz can open thousand of files same

as your PC. Handles are used for fast access to a file. If a user needs to log data to 2

files at the same time, “VOLTAGE.LOG” and “CURRENT.LOG” file handles become

very useful. To do so, open VOLTAGE.LOG under handle 1 and CURRENT.LOG under

handle 2. Now start sending your data to handle 1 and 2 instead of the file name.

Handles can even point to files on different medias because USBwiz contains three

independent FAT cores.

6.3. USB Mass Storage

USBwiz has an internal USB Mass Storage Driver that can control two Mass Storage

Devices at the same time. In case there is a requirement to access a LUN, FM command

can be used with the LUN extension. FM p>l where p is the port number and l is the LUN

number. FM p command alone will use LUN0

FM 0

6.4. USB Human Interface Device

This USB class includes vast range of HID devices. Examples are: joysticks, mice and

keyboards.

First, the HID must be registered like any other USB device. We will initialize the HID

which is attached to USB port 1:

UH 1

Now USBwiz is ready get data from the HID which can be performed by Read HID:

HR 1

Then USBwiz will output the data size of the HID. Now, we can repeat HR 1 to read more

data from the device. It is normal for HR to return code “HID_NO_DATA”.

When the user read data from HID devices, it can represent different things depending on

the HID device. For example, it can represent a mouse move or a keyboard button press.

Your reference should be USB Device Class Definition for Human Interface Devices and

USB HID Usage Table from www.usb.org

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B&B Electronics Parallel Printer Card PIOC Uživatelský manuál Strana 21