usb composite device driver

initialized by Usb_fill_bulk_urb () and submitted to the USB core, which is the 3rd, 4 steps of the USB read data operation process. In the Usb_fill_bulk_urb () function, initialize the URB completion function Usb_read_port_complete (), and the function Usb_read_port_complete () is called only when the URB commit is complete. The pseudo code is as follows:Static u32 usb_read_port (struct intf_hdl *pintfhdl

Relationship among bus, device, and driver Bus:As the connection channel between the host and peripherals, some buses are relatively standard and form many protocols. For examplePCI, USB, 1394, IIC, etc. Any device can select a suitable bus to connect to the host. Of course, the host may be the CPU itself. The memory i

/ Step2, sudo modprobe pl2303 Step3, Sudo/etc/init.d/nfs-kernel-server restart STEP4, reseat USB switch serial device Step5,sudo minicom Ok. Below is For the notebook holder without serial port, do hardware development is often not a serial port and worry, but now has a USB switch serial

independent, with their own resources (addresses and irqs), you can use platform_driver. For example, LCD, USB, UART, and so on can all be written using platfrom_driver, while it is better to use the platfrom_driver mechanism for devices in the smallest system such as timer and IRQ. In fact, the kernel implementation is also like this. References: Linux-2.6.24/documentation/driver-model/platform.txt

to the ISA bus with a compatible interface connector Designed for jumper-free devices 32-bit address and data cable, multi-master DMA, and shared disconnection VLB VLB (VESA local BUS,VESA partial bus) interface bus, which extends the ISA connector by adding a third vertical slot SBus has been around for a long time, with quite a high level of design Although only SPARC computers use the bus, it is intended to be proc

-directories, still, it's okay to create all the files in the/dev directory. Note that the input/USB/MISC subsystem only regulates the kernel device driver structure, which is transparent to user space. I feel that such normalization of the Linux kernel best reflects the truth of the computer industry, that is, "adding a Level". By introducing a new level, the Li

There is a connection to the itunes icon on the screen, when the computer prompts to discover new hardware "Apple Mobile Device", Pop-up prompts box to install the driver, click Automatic Search fruitless, drive installation failed, the computer does not recognize the recovery mode of iPad2, pain. (also appeared when IPhone4 was upgraded) Then itunes prompts 1602 error. is not a lot of peak friends have se

Win10 cannot identify USB device solution, win10usb Some people often tell me that the computer cannot recognize USB. What should I do? Today I will share with you the reasons and solutions. First, right-click the start and find the Device Manager. win10 is the same as win7, as shown in: In the

We are in the process of using the Win7 system, sometimes we plug in the USB device, sometimes the system can not read, and then will be prompted to say "do not recognize the USB device", that is the set of problems or what? Let's take a look at the processing of USB devices

In Linux, USB storage devices are managed as local storage devices, just like local disks.Therefore, after you enter the fdisk-l command, the USB storage device is listed with the local disk.Www.2cto.comThe USB flash drive device is named sdb and is simulated as a SCSI

Vista has been the trend of the Times, February installed on the Vista Ultimate, has been normal use, but the hard disk is relatively small, 120G, C disk only zoned 20G, and a mess of loaded a pile of things, the results of the remaining space is too small, often reported that no way to follow the way to lose weight, But make some space, but the problem also comes, first can not normal automatic update, genuine, can not automatically update, that does not die, from the internet found a solution,

When the USB device is inserted for the first time (the author uses the USB minimum system that I do to test), after inserting the computer, the unknown device is displayed in Device Manager, as shown in:Right-click, select Properties, see Hardware ID and PID in details, as

Write Linux parallel interface character device driver translated from: the Linux kernel Primer: a top-down approach for x86 and PowerPC ubuntures "Translated by clardia Salzberg Rodriguez, Gordon Fischer, Steven Smolski Liu Jianwen ) Key: Parallel Port of Linux driverIntro In this tutorial, a Linux driver is written for a parallel port controller with simple f