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}catch (Exception e) {Todo:handle exceptionE.printstacktrace ();}
Another: Device information can also be seen through the ADB shell into executive cat/proc/bus/input/devices.
USB external input device information is printed as follows:
Copy Code code as follows:
i:bus=00
, tasklet, or a timer callback function. 2. the caller holds the spin lock or read/write lock. note that this value is unnecessary if a semaphore is being held. 3. current-> state is not task_running. unless the driver has changed the current status, the status should always be task_running. the gfp_noio driver is in block I/O processing. it should also be used for error handling of all storage types. gfp_kernel does not belong to any other situations
From: http://blog.csdn.net/hgd_dingjun/archive/2007/08/17/1747864.aspx
In this system, the so-called USB device and host are determined by detecting changes in the pull resistance of the VCC to determine whether there is a device connection. D12 is integrated with a k Ω pull-up resistor, which is not connected to VCC by default. when running the program, you can
Transferring data between a computer and an external device is a common task, with photos, videos, important files, and data backups, which are often transmitted back and forth many times.
That's why transmission speeds are unpleasant. If you need to take a few gigabytes of data to a meeting right away, no one wants to wait 10 minutes to copy the data and will be late. Fortunately, there are several simple
enter the collected data, complete the USB device access, hereinafter referred to as the client or virtual USB terminal.In order to collect USB data, it took some trouble, the first thought is the filter drive to collect USB device
the corresponding hardware controller. Of course, if you are not interested or have no time to familiarize yourself with this, you can also temporarily skip the hardware-related part. This article also focuses on the description of the software structure and does not care about the hardware details.
The following describes some key data structures and APIs involved in the UDC driver. For more information, see s3c2410_uda.c.
1. Key data structures and APIs
The Gadget API provides interfaces for
1, first to the system preferences, add an administrator rights account.
2, then to the system hard disk/system (System)/library (resource pool)/expansion/path.
3, will expand the folder press Introduction (cmd + i) in the lower right corner after the unlock, press the Left + number to add their own account can read and write permissions.
4, then in the extension, find Iousbmassstorageclass.kext This file, and remove him to other locations, the sys
structures.
5. 3. lock the current hub tree because the hub has only one daemon, and all the hubs use this daemon. The daemon can only serve one hub at a time. Therefore, as long as one hub is using this daemon, it needs to be locked to prevent other hubs from being used.
5. 4. perform reset or resume operations on each port of the hub by bit. Note that the reset or resume operations are performed from 1. Bit 0
process the device.
If enabled, the device is re-inserted.
Related functions:
Searchanddismountusbstro
# Include "storemgr. H "
Enumactivedir
Typedef struct _ reg_item_name
Windowproc
Method 2 storage device processing
Ideas:
Disable:
USB storage device. If the storage
Mbps, supports concurrent operations on multiple data streams and multiple devices, and supports hot swapping of peripherals.
At present, although the USB interface has only developed 2 generations (USB 1.1/, USB), USB integrates all the advantages of a multi-platform standard-including cost reduction and compatibilit
(struct ohci hcd *ohci);3 USB Device Driver3.1 USB device drives the overall structureThe following device classes are available
Audio Device class.
Communication Equipmen
fields in the structure are described in detail in the DOSUSB documentation. In addition to the alternate fields do not need to fill out, Error_code and status returned by Dosusb, so fill 0 can be, the following will introduce more detailed methods of filling.In Dosusb's release package, there is a sample directory with many examples, but most of it is written in power Basic, but it still has a good reference value.
During the project development, we need a USB-to-relay device to control the wireless transmitter device when the switch is enabled. When purchasing the device, the sourcing department buys a batch of devices without knowing the operating environment of the relay device, lat
support endpoints by using several additional bits of the high-level portion. */__u8 Binterval; If the endpoint is a break type, the value is the interval setting for the endpoint, that is, the interval between interrupt requests for the endpoint, in milliseconds
/* Note:these _only_ in audio endpoints. *//* Use usb_dt_endpoint*_size in blength, not sizeof. */__u8 Brefresh;__u8 bsynchaddress;} __attribute__ ((packed));
#define USB_DT_ENDPOINT_SIZE 7#define USB_DT_ENDPOINT_AUDIO_SIZE 9/* AUDIO e
system default is not ticked, as long as the option to restart the computer, You can see the new mobile hard drive letter in the resource manager.
Word, the mobile hard disk can not identify the reasons for the failure of more, but generally not USB interface or the fault of the mobile hard disk itself, so we need to eliminate the time from the surrounding relevant part of the consideration, I believe you can also smooth use of mobile hard disk.
the set address stage. The USB host sends a request to set the address to endpoint 0 of the device with the address 0 (Control the build process of the transfer), and the new device address is included in the data package for the build process. The specific address is manag
test the hot-plug operation is normal.
hot-swappable, which automatically recognizes and initializes operations without the need to invoke load and unload instructions. Please select the serial Operation command, the computer keyboard printing numbers can: l-load USB u-Uninstall USB 1-show SD card capacity and remaining capacity Span style= "font-size:16px" >2-Displays the file under the root
Speaking of USB devices, we have to mention a variety of descriptors (descriptors), in general, descriptors are as follows:
1: Device Descriptor (Device descriptors)
2: Configuration descriptor (Configuration descriptors)
2: Interface Descriptor (Interface descriptors)
3: Endpoint descriptor (Endpoint descriptors)
A
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