USB Complete fourth- P19 pptx

... fit a defined USB class and need only bulk or isochronous transfers. #TEJKVGEVWTG FTDI’s chips take a different approach to USB design. The controllers handle enumeration and other USB communications ... enables adding USB to just about any CPU circuit. A disadvantage is the need to use two chips instead of having the CPU and USB controller on a single chip. Also, example code for...

Ngày tải lên: 04/07/2014, 07:20

... should use a USB interface? Find out whether your device should use USB or another interface. If the choice is USB, you’ll learn how to decide which of USB s four speeds—including USB 3.0’s SuperSpeed—and ... other USB devices? Find out how to develop a host for an embedded system or a USB On-The-Go device that can function as both a USB device and a limited-capability host tha...

Ngày tải lên: 04/07/2014, 07:20

... the host in response to the next Get Port Status request. A USB 1.x hub may instead detect the device’s speed just after a bus reset. USB 2.0 requires speed detection before the reset so the hub ... bandwidth. To help ensure that devices will enu- merate without problems, default interfaces in USB 2.0 and USB 3.0 devices must request no isochronous bandwidth. In other words, a default...

Ngày tải lên: 04/07/2014, 07:20

... way to provide this information, the Wireless USB specification introduced two new descriptor types. The USB 2.0 Link Power Management Addendum and USB 3.0 specifi- cation also incorporate these ... return no string descriptors must not return an array of lan- guage IDs. The USB- IF’s website has a list of defined USB language IDs. bString is valid for string descriptors one and high...

Ngày tải lên: 04/07/2014, 07:20

... high-speed USB boards with EZ -USB chips: the USBee EX2 Experimenter’s Board from CWAV, Inc. and the QuickUSB Module from Bitwise Systems, Inc. Both boards contain programmed Cypress EZ -USB FX2 controllers, ... that handles non -USB tasks and communicates with the USB controller as needed. These chips are sometimes called USB interface chips to distinguish them from microcontrollers...

Ngày tải lên: 04/07/2014, 07:20

... Definitions public const string WINUSB_DEMO_GUID_STRING = "{42CA71EC-CE1C-44c2-82DE-87D8D8FF6C1E}"; Use System.Guid myGuid = new System.Guid( WINUSB_DEMO_GUID_STRING ); 4GSWGUVKPIC2QKPVGTVQC&GXKEG+PHQTOCVKQP5GV The ... object. 8$ Definitions Public Const WINUSB_DEMO_GUID_STRING As String = _ "{42CA71EC-CE1C-44c2-82DE-87D8D8FF6C1E}" Use Dim myGuid As New Syst...

Ngày tải lên: 04/07/2014, 07:20

... vendor-specific functions is Microsoft’s WinUSB driver. This chapter shows how to develop a device that uses the WinUSB driver and how to use the WinUSB API to access the device from applications. %CRCDKNKVKGUCPF.KOKVU A ... the device from applications. %CRCDKNKVKGUCPF.KOKVU A device is a candidate for using the WinUSB driver if the device and its host computer(s) meet the requirements b...

Ngày tải lên: 04/07/2014, 07:20

... tests. The USB Command Verifier Compliance Test Specification describes the tests. The USBCV software and test-specification document are available from the USB- IF’s website. The USBCV software ... exiting USBCV, the software restores the original driver. The USB- IF recommends running the software only on hosts that are using Microsoft’s USB drivers. You can run the tests while using...

Ngày tải lên: 04/07/2014, 07:20

... NET2272 . . . . . . . . . . . . . . . . . . . . . . . . . 157 FTDI USB UART and USB FIFO. . . . . . . . . . . . . . . . . . . . 159 USB Complete: The Developer’s Guide, Fourth Edition by Jan Axelson Copyright ...  Microchip PIC18F4550 . . . . . . . . . . . . . . . . . . . . . . . . . . . . 148 Cypress EZ -USB. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 152 AR...

Ngày tải lên: 04/07/2014, 07:20

... option with the release of USB 2.0, and USB 3.0 defined SuperSpeed. 4GNKCDNG USB s reliability is due to both the hardware and the protocols. The hardware specifications for USB drivers, receivers, ... flexibility built into the USB protocol, the support in the controller chips and operating system, and the support available from the USB Implementers Forum. 8GTUCVKNG USB s four tr...

Ngày tải lên: 04/07/2014, 07:20