android usb device driver

This article was reproduced from: http://blog.csdn.net/u013686019/article/details/50165059[HTML]View PlainCopy android:4.4.4 First, the problem analysisWhen the USB printer is plugged into an Android device, there is no printer node (/DEV/USB/LP0) generated in

Recently, I made a functional driver for a USB device, analyzed its speed bottleneck, and found out the main reasons that affect the speed of the device. Because of the versatility of the USB device, the Code subject directly uses

Relationship between bus, device, and driver in Linux 1. Bus: As the connection channel between the host and peripherals, some buses are relatively standard and form many protocols. Such as PCI, USB, 1394, and IIC. Any device can select a suitable bus to connect to the host. Of course, the host may be the CPU itself. T

installed without a driver in windows, in addition, you can access these hardware interfaces in the user mode through the built-in Windows interfaces. After testing, the HID device uses the bushound5 bus observer to capture data from USB devices on the bus. The HID device is very simple, it took me two hours to figure

process of the lock mechanism is similar. Declare variables, lock, execute critical code, and then unlock. The difference is that there are different restrictions on allowed re-import, some of which allow unlimited re-import, some allow only the re-import of heterogeneous operations, and some do not allow re-import operations, some can be used in sleep code, and some cannot be used in sleep code. When considering the use of different lock mechanisms, we also need to consider the CPU processing

Android USB Connections Explained:mtp, PTP, and USB Mass StorageOlder Android devices support USB mass storage for transferring files back and forth with a computer. Modern Android devices use the MTP or PTP protocols-you can choo

When you manually install the NIC driver, the system prompts "Windows cannot find the driver file of the device", as shown in the figure below:This problem is caused by the useIncorrect driverThe system cannot be identified.Solution1Download the correct driverCheck the model and hardware version of the network card. We downloaded it from the official we

Android USB Development Trouble is still more.First Type: Host modeThis mode is good, powered by an Android device, and then communicates with the external device. For example: A computer connected to a USB

the production business, the product description, the model and so on.(11) At this time the host will pop up the window, showing the discovery of new equipment information, production, product description, model and so on.(12) According to Device_descriptor and device_configuration answer, PC judge whether can provide USB driver, general Win2K can provide several kinds of equipment, such as game joystick,

USB devices are very complex and consist of a number of different logical units, and the relationships between these logical units can be described simply as follows: L devices (Usb_device) typically have one or more configurations (Usb_host_config) L configuration usually has one or more interfaces (Usb_interface) The L interface usually has one or more settings L setting has no or more than one endpoint (Usb_host_endpoint) Detailed descriptions

device *start, 286 void *data, int (*FN) (struct device *, void * )) 287 {...... 295 Klist_iter_init_node (bus->p->klist_devices, i, 296 (start? start->p->knode _bus:null)); 297 while (dev = next_device (i)) !error) 298 The FN here is the __driver_attach function, so let's take a look at what it did:265 static int __driver_attach (struct

// driver category, which indicates that this is a USB deviceClassguid = {36fc9e60-c465-11cf-8056-444553540000} // The GUID value of the corresponding USB device. Guid values of different devices are different.Provider = % provider % // provider of the INF file, % provider %Is a string tag. In the strings segment, you

The device identification string plays an important role in the enumeration and loading process of the driver device. Device ID string is generally dividedHardware identifier string, compatibility identifier string, and device identifier stringThese types. These identifiers

Scenario After the first installation of the system, the usb cannot be used. The usb serial interface driver is not installed. It is normal that the NIC driver cannot be installed. How can I install the driver in this case? Solution Check whether there is no