usb host otg

Use AT91RM9200 as the master CPU, use the USB host interface of the chip to access the USB flash drive, and save the corresponding data to the specified file of the USB flash drive according to the upper-layer commands received. No additional dedicated USB control chip is us

Turn from: http://blog.chinaunix.net/uid-23795818-id-2385141.htmlWhat the host will do: Hardware and softwareThe hardware required for the host side is: USB host controller and a root hub with one or more USB ports.The SOFTWARE is: an operating system, enables device drivers

1. Host Controller uhci:universal Host Controller Interface (Universal host Control Interface, usb1.0/1.1)Ohci:open Host Controller Interface (open host Control Interface, usb1.0/1.1)ehci:enhanced Host controller Interface ("Enha

-. 0: Unable to enumerate USB device on Port 1 As a result, the mouse cannot be used. Find the cause for half a day and find that the D + and D-interfaces of the Board Sub-host interface are reversed. Then, the mouse can be used normally. The normal log is as follows: [71.114150] ==13 ==> hub_port_init 1[71.118120] plug in USB port2USB 1-1: new low speed

configuration can be valid at the same time and can be connected by different drivers. Each interface can have a backup interface to provide service parameters of different quality The interface does not have or has more than one endpoint: An endpoint is the most basic form of USB communication. Each USB device interface is a set of endpoints on the host. Th

enumerate USB device on port 1 As a result, the mouse cannot be used. Find the cause for half a day and find that the D + and D-interfaces of the Board Sub-HOST interface are reversed. Then, the mouse can be used normally. The normal LOG is as follows: [71.114150] ==13 ==> hub_port_init 1[71.118120] Plug in USB Port2Usb 1-1: new low speed

Transferred from: http://blog.csdn.net/ljzcom/article/details/8186914Copyright NOTICE: This article for Bo Master original article, without Bo Master permission not reproduced.Directory (?) [-] 2 Key Data Structures 3 System Architecture 4 Usb_submit_urb 1. Host Controlleruhci:universal Host Controller Interface (Universal host Control Inter

1. Host Controller uhci:universal Host Controller Interface (Universal host Control Interface, usb1.0/1.1)Ohci:open Host Controller Interface (open host Control Interface, usb1.0/1.1)ehci:enhanced Host controller Interface ("Enha

Uhci (universalhostcontrollerinterface), OHCI (openhostcontrollerinterface), EHCI (enhancedhostcontrollerinterface) are both host controller specifications, OHCI is mainly non-PC system USB chip, most uhci are USB controller chips on Intel and via boards. The uhci hardware circuit is simpler than OHCI, lower cost, but the drive is complex, but they all follow the

Usbh_en (corresponding to gpg6) of is used to power the USB host, which needs to be controlled in BSP and can be used in init. the following code is used in the oeminit ()-> configuregpio () function of the C file: // Ser gpg6 to output an usbh_en S2440iop-> gpgcon = ~ (3 S2440iop-> gpgcon | = (1 S2440iop-> gpgup | = (1 S2440iop-> gpgdat | = (1 Use the above Code to enable the power supply to the

http://www.arm8.net/forum.php?mod=viewthreadtid=255 Then you must familiarize yourself with the USB v1.1 protocol first. Therefore, it is not easy to use the USB host interface provided by s3c2440 to correct the content of this part. Here, I mainly introduce the USB device enumeration process involved in some knowledge

Example assigning Host USB device to a Guest VMThis example was based on QEMU-KVM (0.15.0) as installed in Fedora 15. Would first show how does this manually, and second how to do it using the the Virt-manager tool. This HOWTO are limited to UHCI devices (no USB2 EHCI).Here we'll use a phone attached to the host:# Lsusb ... Bus 002 Device 003:id 18D1:4E11 Google

The protocol stack of usb msd host has been transplanted to the customer in recent days. I found that porting 100 + k code from one m3 to another m3 is really not simple, mainly because of the m3 of different manufacturers. The difference between peripherals is too great. After describing the underlying hardware layer, it is found that the USB protocol is too dif

The UMAP2 is a Python-based USB Host Security Assessment tool developed by NCC Group and the Cisco SAS team.It has all the features supported by the first edition: UMAP2EMULATE:USB Device Enumeration Umap2scan: Usbhost Scan for device support Umap2detect:usbhost Operating system detection (not yet implemented) UMAP2FUZZ:USB Host Fuzzing

In our system, the USB host is used to read and write the USB flash disk. Therefore, the design and architecture fully focus on this purpose. The entire system involves a lot of content. According to the general principles of embedded system development, a hierarchical architecture is adopted to divide the system into several levels by function, and each layer co

Front-end time to tinker with a HID hardware, need and Android communication, online search a lap, harvest is not small.The better articles are:Android USB host with HID communicationAndroid service creates USB host communicationWhere the code is to be noted in some places, please note:/***

About the USB pull-up resistor, not just a random resistance to any resistor on the OK.When your USB is the main device , the d+, D-on is connected to a 15K pull-down resistor, which allows the d+, D-to remain low when no device is plugged in;When interfacing to slave devices , the different transfer rates can be set by the pull-up resistor, when the d+ is connected to a 1.5K pull-up resistor, it can work i