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12 Threads found on edaboard.com: Usb Device Detection
Basic detection is confirmed by opening the device Manager. (Via the System control panel.) There should be a list of usb ports. If you see a yellow Alert icon then something is not right. You can draw power directly from the supply terminals. 5V. 130mA. To obtain 500 mA, a device must negotiate for more power after it is (...)
When first plugged into usb, a device can only draw a certain amount of milliAmps (about 100 mA). Before it can draw more power it must negotiate with the host. The process is called enumeration. Does the host detect current flow? Does it detect a voltage drop? Does it detect digital communication? Not sure which. Here's one discussion from among
I'm also having lot of problem with FT232 usb connection. Signal should be properly shielded. Now I'm using a Chinese version usb to serial converter (CH340G). Its very better then FT232 for Connectivity, cost & package.
Hi every one, presently i am working on STM32F407 usb, in my project i am configured STM as a host and MSC class as a device, but when i am connecting the pen drive (MSC class device), all interrupts are raised except host port interrupts. what are the factors effecting for the host port detection in the STM32F407 Host, (...)
Hi every one, presently i am working on STM32F407 usb, in my project i am configured STM as a host and MSC class as a device, but when i am connecting the pen drive (MSC class device), all interrupts are raised except host port interrupts. what are the factors effecting for the host port detection in the STM32F407 Host, (...)
Hi All, Is there any one familiar with usb2.0 and BC1.2 spec.? device connection detection requires device to pull up 1.5K Ohms resistor, but won't this conflict with BC1.2 charger type handshake electrical characteristics? BC1.2 requires PD to force a 0.6V at DP when doing handshaking. But the device (...)
Refer Mikro C Help for the detection part (usb HID). on the Host side you need to run a program to receive data from the usb (Probably In C# or C)
As a first step, resistors connected to D+ and D- signal a low speed or full speed device. After that, communication through usb data lines is started. Review the usb specification (from or a tutorial. Many informations are available from this site Jan Axelson's Lakeview Research
hi to all... thew thingi is: I had made a usb application... with a PIC18f2550 and with MCHPusb Driver (that one witch comes with the framework...) it works nicely... so I am making it more useful so, how can I make (I think it should be in the INF file...) that my App Program should be launched when I connect my device into the PC??? (...)
I'm now working on a project about designing a usb host controller. My PHY interface is an UTMI standard chip. I've got a question: if I would like to enable Plug and Play on the usb host controller, how should I know my usb device is connected or not from UTMI interface? I searched through the usb2.0 and (...)
hi,all When in usb2.0 detection process. First, Devie sends a chirp K, then after hundreds of ns, device will detect KJKJKJ. If detected, then go to HS mode, otherwise go into FS mode. I want to know, who and why sends KJKJKJ, device or Host? Thanks in advance! /David
The usb hub detects a usb device via the device's pull up resistors on the data lines, depending on the operating speed. This is part of the usb specifications. This pull-up effect is is controlled by the microcontroller via the ATTACH bit. Normally, the device doesnt have to know (...)