java barcode reader tutorial 18: Input/Output in Software

Generation QR Code 2d barcode in Software 18: Input/Output

372 18: Input/Output
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Lab Materials and Setup
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The materials you need for this lab are A Windows system using USB A copy of Nir Sofer s USBDeview utility (wwwnirsoftnet/utils/usb_devices_viewhtml) At least one USB hub A notepad and pencil
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This lab is very exible in terms of the types of USB (Low-Speed, Full-Speed, Hi-Speed, SuperSpeed) supported on the system, as well as the number and type of USB devices Add as many USB devices as possible (you can have up to 127 devices per USB controller, so knock yourself out!), and try to get at least one USB hub, either powered or unpowered The more USB devices and hubs you can get, the more interesting this lab becomes
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Getting Down to Business
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Using the USBDeview program, you can view detailed information about your USB controllers and the devices currently running on them Step 1 Start the PC with as few USB devices physically installed as possible
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Step 2 Make sure a copy of USBDeview is on the system USBDeview is a freestanding executable le and does not require installation Place the le on your Windows desktop for easy access Step 3 Open Device Manager and count all the USB controllers (see Figure 18-1) On older systems you should see two types of controllers: a Standard OpenHCD Host Controller and a Standard Enhanced Host Controller Newer systems will use different names such as Universal Host Controller and Enhanced Controller Do you see two different types of USB controllers Step 4 To get the most out of USBDeview, you need to do some setup First, go to wwwlinux-usborg/ usbids and save the Web page as usbids in the same folder that holds the USBDeviewexe le Next, start USBDeview and select View | Choose columns Make sure your rst two columns are Vendor Name and Product Name Then click Options and uncheck Display Disconnected Devices When you re done, USBDeview should look something like Figure 18-2 Great! Time to work Compare what you see in Device Manager to what you see in USBDeview How do they compare Do you see any differences Count the ports reported by USBDeview and compare that to the actual number of ports on your system Are the numbers the same
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Lab Exercise 1802: USBDeview 373
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Figure 18-1 Two USB controller types in Device Manager
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Figure 18-2 USBDeview in action
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374 18: Input/Output
Hint Sometimes, running USBDeview and Device Manager at the same time will confuse Device Manager If you re having problems, just close and reopen USBDeview as needed
Step 5 Insert a USB device, making sure to install the correct drivers rst USBDeview should update as soon as the device is inserted Document which USB host controller (look under the Device Name column; USBDeview uses the term hub when it should say controller ) and port are running the device Unplug the device and reinsert it into a different USB port Document the changes Is it on a different controller (hub) Is it on a different port
Step 6
Repeat Step 5 for other USB devices until all of your USB devices are in use
S 30 minutes
Lab Exercise 1803: Paging Dr Keyboard!
Keyboards are plentiful and common, and a new basic keyboard is very inexpensive Even with cheap keyboards, users tend to get attached to these devices over time and in the case of an expensive keyboard with lots of extra buttons and features, the user may have both a nancial and an emotional attachment! For these reasons, it s important that you learn to play Dr Keyboard, xing these devices when they break
Learning Objectives
At the end of this lab, you ll be able to Repair stuck keyboard keys Dismantle and clean a keyboard
Lab Materials and Setup
The materials you need for this lab are A Windows system As many throw-away keyboards as possible (functional keyboards that you won t mind throwing away at the end of this lab; connection type is unimportant as long as they re usable by a Windows system) A medium-sized athead screwdriver
Lab Exercise 1803: Paging Dr Keyboard! 375
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