Android transfer sqlite database to USB flash drive from sdcard programatically
As is documented in several other questions here, Android APIs support only raw transfers, so you would have to implement an entire filesystem in your app. Since your device is custom, you would be better off creating a Linux-level daemon or (bulletproof!) setuid tool to mount the USB drive at...
Android - running app on a usb-connected device
Make sure that USB Debugging is enable Connect your device as camera (PTP) This link could help you: http://www.techotopia.com/index.php/Testing_Android_Studio_Apps_on_a_Physical_Android_Device...
Is it possible to establish a permanent connection between Android application and USB host device
Use usb-serial-for-android library to establish a permanent connection between Android application and USBhost device. Refer this link
Mount USB Key on Boot
FAT doesn't support permissions. The permissions of the mounted device depends on how it is mounted. You have to edit your fstab like something like that /dev/yourdevice /pathtothemountpoint fat rw,noatime,uid=500,gid=500,user 0 0 Replace the UID and the GID and user with your UID and GID and username ...
Is PID = 0 a valid for usb device?
Yes. As far as I know, there is nothing in the USB specification that prevents the product ID from being 0, so you should be fine. This listing of USB IDs contains several instances of USB devices with a product ID of 0. Keep in mind that your product still...
Execute mutli command lines in java
write a startup batch start.bat like so @echo off rem change to this batch's folder pushd "%~dp0" set Path="%~dp0\Java\bin";%%Path%% set JAVA_HOME=%~dp0\Java java -jar App.jar popd and execute it as \data\commands\start.bat Setting the current path of a process from java is done using ProcessBuilder and setting the directory-property. See a sample...
Copy all files with certain extension from all subdirectories from a portable device (which has no drive letter assigned)
Forget the Portable Device of the USB option. On phone Download a server app such as WebDAV Server. This mounts your phone roots directory over your local WiFi connection Open app and start WebDAV server (mine: http://192.168.1.113:8080) On pc Assign a map network drive from the command prompt. Open cmd.exe...
How control the embedded sensors on smartphones via Matlab
android,matlab,usb,signal-processing,sensor
As I teach (to my students) in such cases: "Google is your friend.", but I don't remember ever this lesson for me. In the Matlab File Exchange (http://www.mathworks.com/matlabcentral/fileexchange/40876) there is a free toolbox for analyzing output data. Of course, in the smartphone must be installed an application: SensorUdp (https://play.google.com/store/apps/details?id=jp.ac.ehime_u.cite.sasaki.SensorUdp). Matlab...
Linux libudev test application not receiving REMOVE events
So by looking at the output of udevadm monitor I was able to see that on the newer kernel on the ARM board the remove events aren't tagged with hidraw as they are with the add event as shown below: box:/home/eng$ udevadm monitor monitor will print the received events for:...
C# How do I check USB Ports with USB Hub and used Controller?
c#,controller,usb,port-scanning
I've found the solution myself. The key is to use the registry via c++ dll. The Code below is a example i used from another site. I hope it will help the community too. source: http://www.news2news.com/vfp/?example=545&ver=vcs&PHPSESSID=70ba6845606a96b355ab7f772fb14386 Code: using System; using System.Collections.Generic; using System.Runtime.InteropServices; using System.Linq; namespace DeviceEnumerator { public class...
Strange behavior for serial communication in C++
The issue is this code: if(serialFD = open(serialdevice, O_RDWR | O_NDELAY) < 0) The < operator has higher precedence than the = operator and so serialFD is set to 0, the value of the comparison, instead of the return value of open. Some compilers will warn you about this because...
USB device detected but can't view the files - I am using a VirtualBox with Host as Windows and Guest Os as Ubuntu
Try mounting your USB device or even if the USB device's file system is NTFS it won't be detected in Ubuntu.
What is the process for getting a HID compliant USB device removed from ChromeOS blacklist?
usb,google-chrome-app,hid,google-chrome-os
This isn't a Chrome OS specific problem. This device is in the Linux kernel's hid_ignore_list because it doesn't implement the HID protocol correctly. Given that the device is blacklisted and so not claimed by the HID driver you should be able to open it using the chrome.usb API.
How to manage USB on Android?
adb list connected devices from your computer's point of view, whereas UsbManager.getDeviceList() literally lists usb connected devices to your Android device... UsbManager.getDeviceList() returns a list of UsbDevice which is defined like so by the documentation: This class represents a USB device attached to the android device with the android device...
Macbook not working properly - How to make ubuntu boot USB from Windows [closed]
ubuntu,windows-7,usb,boot,macbookpro
I had this problem the other day with my uncle's Macbook pro, and was able to get it to boot from a linux USB by using unetbootin - it can be used to create a bootable USB which will run on both Mac and Windows. Simply download & run it...
Reading USB with ioctl fails for “value too large for defined data type”
android,serial-port,usb,ioctl,ftdi
I found a solution. It seems this error, EOVERFLOW, can be fixed just by specifying a buffer size that is equal to the max packet size of the endpoint. This solved my issue.
How to launch my app on connecting to USB?
ios,xcode,usb,external-accessory
Looking at the comments above, the comments by cmyr are indeed correct and as correctly pointed out by Larme, the only solution is to use MFi which can configure the USB device as a custom setting which will always prompt the iOS as a connection.
C++ Win32 Not receiving DBT_DEVICEARRIVAL or DBT_DEVICEREMOVECOMPLETE on WM_DEVICECHANGE
If you read MSDN's documentation, it says: Detecting Media Insertion or Removal Windows sends all top-level windows a set of default WM_DEVICECHANGE messages when new devices or media (such as a CD or DVD) are added and become available, and when existing devices or media are removed. You do not...
Android : how to detect already connected usb device?
Try this: First register Broadcast for USB connection. manifest permission: Get the List of USB Device with details by using this public void getDetail(){ UsbManager manager = (UsbManager)getSystemService(Context.USB_SERVICE); HashMap<String, UsbDevice> deviceList = manager.getDeviceList(); Iterator<UsbDevice> deviceIterator = deviceList.values().iterator(); while(deviceIterator.hasNext()){ UsbDevice device = deviceIterator.next(); manager.requestPermission(device, mPermissionIntent); String Model = device.getDeviceName(); String...
How to Fix TypeError: an integer is required in python 3.4, pyserial 2.7 virtual serial port
python,python-2.7,serial-port,usb,pyserial
I figure it out, ----------tricky python--------- please pull me up, and check my other questions (with answers of course) ok first assigning the serial port in a single line will not work as good as #Method 1 set_ser = serial.Serial(port="COM1", baudrate=9600, parity = serial.PARITY_NONE, stopbits=serial.STOPBITS_ONE, bytesize = serial.EIGHTBITS, timeout=1) writing...
read data from my app's sqlite database using USB cable
Add this code in your main activity and restart your activity. Make sure this code has been called onc and set proper sd card path. Install the sqlite manager tool on windows and see your data. try { String inFileName = "//data/data/com.needzapp.debug/databases/your_db_name"; File dbFile = new File(inFileName); FileInputStream fis =...
How to know what block device correnponds to the lsusb output?
Go to /sys/block/<name>, that will be a symbolic link to something like: /sys/block/sdf -> ../devices/pci0000:00/0000:00:1a.0/usb3/3-1/3-1.4/3-1.4:1.0/host9/target9:0:0/9:0:0:0/block/sdf Then go to the that directory, and in the sucessive parents, you will find a lot of files with interesting information. The data you are asking for, in my particular example, would be at the...
Get detected device USB port from TJvHidDeviceController in delphi?
After lots of search I found the solution. ComPort.Port := HidDev.PnPInfo.DevicePath; ...
Python USB sometimes not recognized
python,python-2.7,automation,usb
Apologies for the extremely late update. There is no bug in the code. I determined it was a hardware issue. The USB keys I was using were cheap and poor quality. I've advised the production team to use different USBs and since have not encountered this failure.
Try to use usb4java highlevel librairie
You miss the commons-lang3.jar in your classpath. Download and add it.
Automatically select video source from dialog? VB.net
vb.net,camera,dialog,usb,image-capture
The solution ultimately was to use EMGU to access the camera; this also allows for connecting to multiple cameras at the same time.
Unable to debug after installing Android 5.1.1 on Nexus 5
android,osx,debugging,android-studio,usb
It was an issue related to Mac's USB port. With another Mac everything works and rebooting issued Mac and changing USB port it worked again. Thanks ...
How to differ between external HDD and internal ones?
You need to do the following: Use CreateFile to get a handle on to the device. Use DeviceIoControl to send an IOCTL_STORAGE_QUERY_PROPERTY ioctl to the device to ask it to tell you its properties. The resulting STORAGE_DEVICE_DESCRIPTOR structure contains a BusType enumeration that tells you the bus to which it...
Without connecting my phone via usb, is it possible to install an app I made on Android Studio?
Build your .apk Download the .apk to the phone Run the .apk You can use an app like ES File Explorer, which allow you to access shared files on your network....
C# detect last connected usb drives USB Protocol (usb3 or 2)
c#,visual-studio-2012,usb,detect
I've got a working solution I found here. How it works? Well, it enumerates the USB Host Controllers. gets the Root Hub and enumerates the ports that owns it. If there is a device connected and it's not a hub then it displays the required information as followings: Example code:...
Kernel32 CreateFile not giving exclusive access to USB device
Looks like it is a device driver issue. I've found a similar discussion: It's up to the driver to manage shared/non-shared, not the IO manager. So you have two choices: Mark your device exclusive in the INF (see the Exclusive registry value under http://msdn.microsoft.com/en-us/library/windows/hardware/ff546320(v=3Dvs.85).aspx ) Add file create/close handlers in...
communicationg to device using cdc usb protocol in c# windows application
winforms,c#-4.0,usb,serial-communication,cdc
You should use the SerialPort class, which is documented here: https://msdn.microsoft.com/en-us/library/system.io.ports.serialport...
Safely eject/unmount usb filesystem on Windows 8.1 64-bit from C#
Well, I got it working myself. The SetupDi functions returns disk devices in a different order than their disk numbers (as given by the DiskNumber field in the DISK_EXTENT structure). The code I linked to makes a bad assumption: that the order that SetupDiEnumDevices returns things in is compatible with...
STM32 Device Firmware Upgrade (DFU/DfuSe) from Android
android,android-ndk,usb,stm32,dfu
We ended up creating our own solution to program a STM32 microcontroller directly from Android over USB using DFU without using the NDK. We open sourced the project here: https://github.com/UmbrelaSmart/android-stm32-dfu-programmer...
Sending ArrayList() into byte[] format thru USB in Android
It's not entirely clear what output you're expecting, but given your example code, I suspect you just want: byte[] bytes = new byte[list.size()]; for (int i = 0; i < list.size(); i++) { bytes[i] = (byte) list.get(i).intValue(); } ...
External webcam for camera to android using usb [closed]
android,camera,usb,android-camera,webcam
I think you can try use Emulator(AVD or Genymotion)on the computer which is connecting to your webcam via USB. And then set your Emulator camera as your webcam, it can just like normal device, but you use the webcam EDIT Software https://play.google.com/store/apps/details?id=com.pas.webcam Library https://github.com/saki4510t/UVCCamera...
How can I communicate an Android Accessory with a USB Serial Port?
Solved it by my own. There's an excellent source code made by FTDI Chip, so if you ever need to perform USB/ftdi connections with Android try this application: FTDI UART TERMINAL Source code: http://www.ftdichip.com/Android.htm ...
Running Eclipse from usb
It turns out there is a really simple solution to this. Amended .bat file @echo off set Path=%~dp032 Bit\jdk32\bin;%Path% cd "32 Bit\Eclipse" start eclipse.exe exit Explanation This works by getting the path of an executing batch file using the command %~dp0. Where d is the drive (in this case N:\)...
STM32 STM32CubeF4 USB CDC operation
I will take the 2 minutes to answer you instead of lecturing you. Receive is done through interrupts. Very, very simply, the hardware sees the voltage change on the D+/D- and flags an interrupt based on the intialization functions. The interrupt calls HAL_PCD_IRQHandler, which calls USBD_LL_DataInStage in the usbd_conf.c file....
Android: connecting to USB device, wait for permission
"and only right after it's completed, the BroadcastReceiver gets the message" The onReceived callback, by default, is called on the main thread. It sounds like you are calling waitConnection() on the main thread as well. Since waitConnection() blocks, the main thread cannot process any additional messages until waitConnection() returns. This...
Device drive insertion handling win32 api
// Output some messages to the window. switch (wParam) { case DBT_DEVICEARRIVAL: msgCount++; StringCchPrintf( strBuff, 256, TEXT("Message %d: DBT_DEVICEARRIVAL\n"), msgCount); break; it is handled in the case of DBT_DEVICEARRIVAL....
Linux USB horror
Apparently an I/O error occurred and the kernel decided to unmount the device and detect it again. Its likely the other way around: The device is removed (by the USB subsystem) and causes errors because it was still mounted. This looks like a hardware problem to me - AFAIK...
When to Update ALSA Audio Driver Buffer Pointer
linux-kernel,usb,linux-device-driver,alsa
These USB audio drivers behave exactly like a PCI sound card, i.e., when the device needs some samples, those samples are just read from the ring buffer. A PCI chip has no way of knowing what part of the buffer actually contains valid samples. A buffer underrun is detected later...
Could not recognize my android device on mac
I after few research and testing of existing solutions, I found mine, my issue was released while I have installed Android file Transfert for Mac
Is there any way to see on linux the USB devices on realtime?
linux,usb,linux-device-driver,lsusb
Sure there is, you can use the udev device manager for kernel. Moreover you can define rules to detect plugged/unplugged devices you are interested e.g. in your case usb devices. Here is a tutorial on how to write a udev rule ...
Programmatically switch USB between shared (disk mode) and mounted (charge only)
Rather than toggling the USB mode back and forth, consider if it might be effective and more convenient to transfer your development test data to and from the device using the adb push and adb pull commands. If you strongly prefer GUI interfaces, there is a file browser built atop...
UART over USB for STM32 Micro-controller
embedded,usb,stm32,uart,usbserial
A USB connection is not a peer-to-peer connection like a UART. It requires a host and a device in a master/slave relationship. The device cannot initiate data transfer; it must be continuously polled by the by the host. A CDC/ACM class device presents a virtual COM port on a PC...
OnePlus One device not shown in Eclipse (Ubuntu)
This worked for me in ubuntu. Settings->Developer Options-->turn on Android Debugging. Settings-->Storage-->menu on the upper right corner-->USB computer connection-->check box MTP/PTP http://forum.xda-developers.com/oneplus-one/help/phone-recognized-storage-connected-to-t2825728...
Can't fire DC Thunder Missile Launcher from Raspberry Pi
python,usb,raspberry-pi,raspbian
Are you using a powered hub or directly plugging the Thunder into the pi? I had the same issue and found out the pi wasn't putting out enough power on its own to shoot the darts. I got a powered usb hub and it worked like a charm.
Making Bootable USB From DVD using Command line
batch-file,command-line,windows-7,usb,boot
You can do this using the program diskpart which is included in windows. You need the following steps: SELECT DISK <DRIVE NUMBER> CLEAN CREATE PARTITION PRIMARY SELECT PARTITION 1 ACTIVE FORMAT FS=NTFS QUICK ASSIGN EXIT save them in a txt file. Find out the drive number using "LIST DISK" You...
Possible to get Usb Drive to Video?
usb,monitor,usb-drive,electronics
You can't solder a USB drive onto a monitor and have it work. You need something to read the data off of the USB drive and generate a video signal for the display. There are commercial products with USB/SD/MMC input and HDMI and/or component video output like this one: http://www.amazon.com/gp/product/B006FNCWSY/...
Linux device descriptor read/64, error 18
18 is not an error here. Note it is a positive number, while all the error codes are converted to negative numbers in Linux kernel. Here, 18 is the return value of usb_control_msg(), which returns the length of the device descriptor if success. So it's the bLength field in your...
USB OTG suspend
Yes of course the phone should deep sleep in this case, it is up to the app to hold a wake lock if there was a special case to have the usb hub running.. think of the usb hub as an extension of your usb port. if your usb wants...
USB WebCamera protocol
What you're looking for is the USB Video Class and you can download the specification for this and other standard USB device classes here: http://www.usb.org/developers/docs/devclass_docs/ The Linux USB gadget framework has code to emulate such a device: https://github.com/torvalds/linux/blob/master/drivers/usb/gadget/function/f_uvc.c...
Resolution of NSURL bookmark fails for an external drive in Yosemite
cocoa,usb,nsurl,security-scoped-bookmarks
This bug seems to be resolved in Mac OS X El Capitan.
Is it possible to get PC's # of physical USB ports?
And to answer my own question: No, it's not possible. WMIC query results for Win32_USBController (or some related path) might seem right but you can't draw any conclusions from them. Information about connectors aren't stored on the baseboard or any other location either. For example an old Dell Latitude D830...
Get information on Usb Zwave key in Java [closed]
There are 2 frameworks to access USB devices in Java. Both wrap native libraries. One is specifically for HID devices (not sure of this applies to ZWave). I dont know if they have all the features required to speak to your zWave devices, but they would be the first thing...
is my do loop code for java correct?
android,for-loop,usb,countdowntimer,batterymanager
There is no way for this do/while loop to end, it's an infinite loop at the moment. The boolean "startcountdown" needs some way to eventually go to the value of FALSE. For example if (_iIsCharging == 0) { startcountdown = false; } ...
How to read Superspeed or Highspeed of a USB flash drive in C#
Due to backward compatibility, SuperSpeed/USB3 devices are reported back as HighSpeed/USB2, if you really need to know if the device is Super speed, you need to use: IOCTL_USB_GET_NODE_CONNECTION_INFORMATION_EX_V2 https://msdn.microsoft.com/en-us/library/windows/hardware/hh450861(v=vs.85).aspx I hope this helps...
Using Delphi + Jedi, losing USB data when device sends it “too fast”
Since the cause of the problem appears to be related to the amount of time the USB reading thread is blocked by Synchronise, i.e. the data processing carried out by the main thread, I made changes in the thread code, (TJvHidDeviceReadThread class, JvHidControllerClass.pas unit). Any code that used this unit...
C# .NET ReadFile from USB AccessViolationException was unhandled
c#,.net,usb,dllimport,readfile
Because you have a wrong declaration of the ReadFile function. Remove out from the lpbuffer argument. Import of the ReadFile: [DllImport("kernel32.dll", BestFitMapping = true, CharSet = CharSet.Ansi, SetLastError = true)] [return: MarshalAs(UnmanagedType.Bool)] public static extern bool ReadFile(IntPtr hFile, byte[] lpbuffer, UInt32 nNumberofBytesToRead, out UInt32 lpNumberofBytesRead, IntPtr lpOverlapped); Reading a file:...
Best practices for implementing a thread to do fast, bulk, and continuous reading in C#?
For .Net 4 you can use a BlockingCollection to provide a threadsafe queue that can be used by a producer and a consumer. The BlockingCollection.GetConsumingEnumerable() method provides an enumerator which automatically terminates when the queue has been marked as completed using CompleteAdding() and is empty. Here's some sample code. The...
HID compliant device will not enumerate using chrome.hid API on ChromeOS
javascript,usb,google-chrome-app,hid,google-chrome-os
It is possible the device is blacklisted by the Linux HID driver. If you can put your Chrome OS device in developer mode or connect the device to a Linux computer you can check the kernel log to see how the device is recognized. If all is well then there...
Android, AOA2, USB Isochronous Audio Interface ( Streaming )
android,audio,usb,samsung-mobile,android-usb
Isochronous USB Audio actually work in the above mentioned manner, start the device, switch to AOA2, connect to the Isochronous Endpoint and start reading. Actual payload exist only when audio is played on the device, and thus, mute packets are not streamed through ( rather empty packets are sent when...
Phone as Bluetooth card for the computer
Not directly, no. At the very least you would need an app on the phone to act as a bridge to send and receive data to the bluetooth device. You might also need a driver or application to make use of the data on the pc. In any case, this...
Reading data from USB device (Waterrower S4 Monitor) with libusb and Ruby
ruby,osx,usb,osx-yosemite,libusb
Have you seen the document titled "Water Rower S4 S5 USB Protocol Iss 1.04.doc"? Here is the link. The github project seems to be similar to what you want to do. It should help out in understanding the usb data....
What's the difference between “COM”, “USB”, “Serial Port”? [closed]
windows,serial-port,usb,hardware
Serial port is a type of device that uses an UART chip, a Universal Asynchronous Receiver Transmitter. One of the two basic ways to interface a computer in the olden days, parallel ports were the other way. Serial is simple to hook up, it doesn't need a lot of wires....
Issues with PySerial: Port must be configured before it can be used
I guess that with the second ser = serial.Serial(), you are overwriting the serial port object that you created in the first few lines. You are replacing it with a new serial port object, which was created without giving it any parameters. Try commenting out that line.
How to disable battery charging during ADB connection?
Dear all probably it can be done via (root privileges): /sys/devices/battery.XX/power_supply/battery/hv_charger_set 0 - Disable USB Charging 1 - Enable USB Charging
Auto open OS X app when specific USB device connected
objective-c,osx,cocoa,usb,apple
Sharing my research and working solution so that other can use if needed. After my further research it seems like that OS X ImageCapture keeps mapping of devices to the auto open app path in com.apple.ImageCapture2 plist file. If you run defaults -currentHost read com.apple.ImageCapture2 on terminal you will get...
What is the proper way to process interrupts?
It is hard to say without knowing precisely your application, but your interrupt handler looks quite reasonable. Generally for multi-tasks systems it is advised to do the least possible in interrupt handlers, because while an interrupt is being handled the different tasks on the systems are not being scheduled any...
Properly call external dll in Delphi?
Your translation is incorrect. It should be: function I2C_GetNumChannels(out numChannels: Longword): FT_Result; stdcall; external 'libmpsse.dll'; The function you are calling accepts the address of a 32 bit unsigned integer. Your translation passed a 32 bit unsigned integer by value. You could translate the import using pointers but it's easier for...
STM32F4 Discovery USB in HS mode?
usb,hid,libusb,stm32,stm32f4discovery
HS mode on all STM32F4 need external PHY
USB3 Controller & Kinect 2
controller,usb,driver,kinect,fresco
Not all the USB 3 controllers support Kinect v2. As described in this page from Xbox.com: Only USB3 controllers from Intel and Renesas are supported If you use a different brand of USB3 controller, the Kinect sensor may not function correctly. In this other page (from the official documentation on...
How to get the file path from a device acting as a usb mass storage in android
By using Environment.getExternalStorageDirectory(), you are actually pointing your sd card or internal storage (depending on which is set as current) and under that you are looking for the device mount point. But mount points in Unix are seen at the root level. Therefore, try directly /mnt/usb_storage/Garmin/system.xml, instead....
C++ Console Application Detect if a USB pluged in
c++,windows,usb,console-application,detect
Have a look at this thread https://social.msdn.microsoft.com/Forums/vstudio/en-US/ef5a76cd-966b-4cf3-a05e-7b809918cedc/message-handling-in-a-console-app?forum=vcgeneral Problem is you have a messagequeue but it doesn't operate as within a windows app....
ExternalAccessory : Receive Data using USB cable
ios,objective-c,iphone,usb,external-accessory
I am quite sure, to develop this I need to use ExternalAccessory.Framework. You are incorrect. The ExternalAccessory framework can only be used to communicate with MFi-compliant accessory devices and Bluetooth devices developed with Apple's support. The iPhone USB cable (and the computer) is not such a device; you cannot...
Which usb driver is called in order to transfer data?
linux-kernel,usb,linux-device-driver
I searched and i found that it's the function usb_stor_bulk_transfer_sglist in transport.c that perform a data transfer for a USB flash drive In fact, it uses URB with sglist of address...
Install Android app on device through wifi - no usb or emulator
android,debugging,android-emulator,usb,wifi
If you are using Cyanogenmod, developer options provides a way to operate adb over network. 1) Enable 'ADB over network' in Developer option of Android Settings 2) When you enable 'ADB over network' and if you are connected to internet, you will find your wlan device ip address below the...
Eclipse Android SDK stopped seeing my Samsung Galaxy S4 device via a USB connection
android,eclipse,usb,samsung-mobile
Well it looks like USB debugging was unchecked. Go figure it was something simple.
Vodafone Mobile Broadband K3765-Z not working in jessie but was working in wheezy
networking,usb,debian,wireless,umts
After many tries I found a solution (at least for me): It seems, there is a problem with PIN-locked SIM-Cards. After setting up the GSM-Connection via the GUI nothing happended (seemed so). But a file for the connection in /etc/NetworkManager/system-connections/ has been created. By disabling the PIN of the SIM-Card...
Linux: Connect Seiko usb printer as serial port
linux,printing,serial-port,usb
I have the impression the printer is actually installed correctly. usblp2 is the device ID. You should be able to print to the printer, but, as usblp2 is not probably not the standard device, you might have to program the print service (probably cups) to use that device to print....
Sending data to Android device, immediately after connection to USB, results in timeout
android,usb,android-open-accessory
The solution turned out to be to increase the timeout for USB transfers. I'm using USB4Java, and it has a default timeout of 5 seconds. When the timeout was increased, it turned out that it took 15 seconds for the first transfer to complete. So I set it to 30...
Arduino doesn't read a proper amount of bytes
c++,serial-port,arduino,usb,raspberry-pi
The issue you are experiencing lies in the actual timeline of events. When the RPi sends the data to the Arduino, remember that it is sending it serially, i.e. one character at a time. As soon as the first byte of data arrives at the Arduino, then Serial.available() will return...
Detect when USB device was disconnected using usbd_core.c
The USB specification defines six USB device states: Attached: the device is attached to the USB but is not powered by the USB. Powered: the device is attached to the USB and has been powered but has not yet received any reset request. Default: the device is attached to the...
Udev Rules and script issues
I found that I had an error of path in my script/udev rule.
How do manufacturers Disable DFU on USB Flash Devices
I don't have any specific knowledge of that controller, but I have read about DFU and have experience with USB firmware. If you are developing new firmware and have the source code, you can remove the DFU USB descriptors and remove the code that handles getting into bootloader mode, and...
Using Arduino as output for Python progam
One improvement in python: x='5' while True: ser.write(x) Now, you get '5' in out, not 'x'. And arduino code: void setup() { Serial.begin(9600); for(char i=0;i<10;i++) pinMode(i, OUTPUT); } void loop() { ; } void serialEvent() { if (Serial.available()) { char inChar = (char)Serial.read(); inChar-='0'; for(char i=0;i<10;i++) digitalWrite(i, LOW); digitalWrite(inChar,HIGH); }...
USB: low latency (< 1ms) with interrupt transfer and raw HID
usb,latency,hid,low-latency,teensy
For USB, it's all polling. Every 1 ms you have a "frame" consisting of none or more transfer descriptors, where each transfer descriptor tells the USB controller which USB device to poll. In general, the USB controller begins the frame with transfer descriptors for interrupt transfers. What this means is...
Teensy to imitate a USB bulk data transfer
First let me clear what I understand from your question. You are creating a software that can analyse any data that can come over USB. You are trying to use Teensy to send data to USB and then process it. Now the answer for feasibility lies in the compatibility of...
USB Soundcard Device Class Specification document
You want the "Universal Serial Bus Device Class Definition for Audio Devices" which is, ironically, the document you linked to, not the specification for basic devices.