USB Complete fourth- P29 doc

... reports with HID-class devices. For devices that use the WinUSB driver, CreateFile obtains a handle the application uses to obtain a WinUSB device handle for accessing a device. The call to CreateFile ... SECURITY_ATTRIBUTES structure). The dwCreationDisposition parameter must be OPEN_EXISTING for devices. For use with the WinUSB driver, the dwFlagsAndAttributes param- eter must use FILE_FLAG...

Ngày tải lên: 04/07/2014, 07:20

... be exchanged. A transfer may take place over multiple frames or microframes, but each USB 2.0 transaction completes within a frame or microframe without interruption. No other packets on the bus ... 2-1. A USB 2.0 transfer consists of transactions. The transactions in turn contain packets, and the packets contain a packet identifier (PID) and sometimes additional information. Inside US...

Ngày tải lên: 04/07/2014, 07:20

... in complete split) IN device data, NAK, STALL, ERR (from hub in complete split) host ACK PING (high speed only) no data packet – device ACK, NAK, STALL Chapter 2 46 5RNKV6TCPUCEVKQPU A USB ... USB 2.0 hub communicates with a USB 2.0 host at high speed unless a USB 1.x hub is between the host and hub. When a low- or full-speed device is attached to a USB 2.0 hub, the hub co...

Ngày tải lên: 04/07/2014, 07:20

... data, a USB 2.0 device can take up to 5 seconds to accept all of the data and complete the Status stage (though once begun, the Status stage must complete within 50 ms). USB 3.0 devices must complete ... operation with any host. For the hub class, USB 2.0 and USB 3.0 recommend average response times of under 5 ms. &GVGEVKPICPF*CPFNKPI'TTQTU If a USB 2.0 device does...

Ngày tải lên: 04/07/2014, 07:20

... bits are tenths, and the final four bits are hundredths. USB 1.1 is 0110h (not 0101h). USB 2.0 is 0200h. USB 3.0 is 0300h. A device with bcdUSB = 0210h or higher must support the BOS descriptor. ... standard USB descriptors. The device must store the contents of its descriptors and respond to requests for the descriptors. 6[RGU Table 4-1 lists the descriptors defined in the USB 2.0...

Ngày tải lên: 04/07/2014, 07:20

... use four USB- specific instructions: USBInit initializes the USB port. USBService monitors the bus status and manages low-level USB communi- cations. A PICBASIC PRO program must call USBService ... C8051F34x low/full Standard Microsystems Corporation (SMSC) USB2 005, USB2 22x full, full/high Texas Instruments TUSB3210/3410 full TUSB6250 full/high Microchip PIC18 Microchip Technology...

Ngày tải lên: 04/07/2014, 07:20

... also write to cards.) USB enters the picture because some CCIDs have USB interfaces for communicating with USB hosts. An ICC device (ICCD) is a smart card that has its own USB interface and thus doesn’t ... Corporation has the AU9525 USB smart card reader controller with a full-speed USB interface. Winbond Electronics Corporation’s W81E381 is an 8052-compatible micro- controller...

Ngày tải lên: 04/07/2014, 07:20

... infor- mation is the source code and other documentation from the Linux USB Project. *QUV%QPVTQNNGT6[RGU To access low- and full-speed devices, a USB 1.x or USB 2.0 host can use a con- troller that ... classes, such as HID and mouse. The USB class is appropriate for USB hosts and hubs and other devices whose installation and configuration require- Chapter 8 218 documentation and...

Ngày tải lên: 04/07/2014, 07:20

... supports USB 1.0, so interrupt OUT transfers aren’t supported and all host-to-device reports must use control transfers. A HID may be just one of multiple interfaces in a device. For example, a USB speaker ... 64 kB/s. High-speed and SuperSpeed endpoints support faster rates, but to comply with the USB 2.0 and USB 3.0 specifications, the endpoints in the default interface should reque...

Ngày tải lên: 04/07/2014, 07:20

Ngày tải lên: 04/07/2014, 07:20