usb

问题 i have made drivers work for the 2012 nexus 7, and a few other android devces. i just got 6 2013 nexus 7's and can not seem to get the drivers installed. i upgraded the software to 6.0.1. but i am unable to get to the screen shown here. adb does not find any devices. in ptp mode, windows finds most of these and assigns a usb driver 6.3.9600.17415 dated 2006. trying update the driver to add a more specific driver fails because windows does not know it's a phone. using have disk fails when

问题 I am trying to access Hid (USB) devices connected to my computer on UWP. I have no problem enumerating the devices and talking to them through Windows API calls in .NET Core. In UWP, I can enumerate the devices, but when I call HidD_GetPreparsedData with the same device (https://msdn.microsoft.com/en-us/library/windows/hardware/ff539679(v=vs.85).aspx), it returns false. I'm thinking that because UWP has its own HID library, I'm supposed to use that, but I'm hoping to reuse my existing code.

问题 I have some C++ code that I need to use for serial communication between PC and Arduino. The file "Serial.cpp" is including a file called "stdafx.h" that doesn't exist in the project or anywhere on my computer, which obviously causes an error. Other than that, I also get other errors, such as C2065 'CSerial': undeclared identifier . Here are the three files that are in the project: Serial.h #ifndef __SERIAL_H__ #define __SERIAL_H__ #pragma once #include <Windows.h> #include <memory.h> #define

问题 I have some C++ code that I need to use for serial communication between PC and Arduino. The file "Serial.cpp" is including a file called "stdafx.h" that doesn't exist in the project or anywhere on my computer, which obviously causes an error. Other than that, I also get other errors, such as C2065 'CSerial': undeclared identifier . Here are the three files that are in the project: Serial.h #ifndef __SERIAL_H__ #define __SERIAL_H__ #pragma once #include <Windows.h> #include <memory.h> #define

问题 i am opening a USB device: for communication using CreateFile : HANDLE hUsb = CreateFile("\\.\LCLD9", GENERIC_READ | GENERIC_WRITE, 0, null, OPEN_EXISTING, FILE_FLAG_OVERLAPPED, 0); The call succeeds (i.e. hUsb is not equal to INVALID_HANDLE_VALUE). But then it comes time to do what we do with every serial port: SetupComm (set receive and transit buffer sizes) SetCommState (set flow-control, baud rate, etc) SetCommTimeouts (set timeouts) Each of these calls with GetLastError code of 1 . E.g.:

问题 i am opening a USB device: for communication using CreateFile : HANDLE hUsb = CreateFile("\\.\LCLD9", GENERIC_READ | GENERIC_WRITE, 0, null, OPEN_EXISTING, FILE_FLAG_OVERLAPPED, 0); The call succeeds (i.e. hUsb is not equal to INVALID_HANDLE_VALUE). But then it comes time to do what we do with every serial port: SetupComm (set receive and transit buffer sizes) SetCommState (set flow-control, baud rate, etc) SetCommTimeouts (set timeouts) Each of these calls with GetLastError code of 1 . E.g.:

问题 I'm working on designing a USB peripheral which will occasionally connect to a Windows PC, and transfer a few KB of data in each direction. There will be a custom PC application that controls the data transfers, using a proprietary protocol (i.e. for the USB payloads). I see at the following link that Microsoft describes how to write a driver for a USB device. But do I need one? Developing Windows client drivers for USB devices The PC application is the only application that we intend to know

问题 I'm working on designing a USB peripheral which will occasionally connect to a Windows PC, and transfer a few KB of data in each direction. There will be a custom PC application that controls the data transfers, using a proprietary protocol (i.e. for the USB payloads). I see at the following link that Microsoft describes how to write a driver for a USB device. But do I need one? Developing Windows client drivers for USB devices The PC application is the only application that we intend to know

问题 I'm using a USB port on the Raspberry Pi 3 Model B to charge an accessory via a USB magnetic charging cable. I want to detect when the cable is plugged in and removed from the Pi . I've been plugging in and removing this cable and looking for any traces of this being detected on Linux. So far, I've tried: monitoring udev events by udevadm monitor . tailing the system logs in /var/log etc. running an inotify watch on the /dev directory for new devices looking around in /sys/bus/usb/devices for

问题 I ran the following code sample obtained from a tutorial here: http://www.dreamincode.net/forums/topic/148707-introduction-to-using-libusb-10/ I ran it against a tablet running Android 4 attached via USB to a MacBook Pro running Mac OS X Mountain Lion. The output contained "Writing Successful!" so I assume libusb_bulk_transfer() worked correctly. My question is where did the 4 bytes of data got transferred to? Can I save it to a file on the Android tablet? Thanks for your help! #include