usb | Self contained USB and HID library for Go | Change Data Capture library

by karalabe C Version: v0.0.2 License: LGPL-3.0

X-Ray Key Features Code Snippets Community Discussions(10)Vulnerabilities Install Support

kandi X-RAY | usb Summary

usb is a C library typically used in Utilities, Change Data Capture applications. usb has no bugs, it has no vulnerabilities, it has a Weak Copyleft License and it has low support. You can download it from GitHub.

The usb package is a cross platform, fully self-contained library for accessing and communicating with USB devices either via HID or low level interrupts. The goal of the library was to create a simple way to find-, attach to- and read/write form USB devices.

Support

Quality

Security

License

Reuse

Support

usb has a low active ecosystem.

It has 49 star(s) with 26 fork(s). There are 1 watchers for this library.

It had no major release in the last 12 months.

There are 8 open issues and 8 have been closed. On average issues are closed in 229 days. There are no pull requests.

It has a neutral sentiment in the developer community.

The latest version of usb is v0.0.2

Quality

usb has no bugs reported.

Security

usb has no vulnerabilities reported, and its dependent libraries have no vulnerabilities reported.

License

usb is licensed under the LGPL-3.0 License. This license is Weak Copyleft.

Weak Copyleft licenses have some restrictions, but you can use them in commercial projects.

Reuse

usb releases are available to install and integrate.

Top functions reviewed by kandi - BETA

kandi's functional review helps you automatically verify the functionalities of the libraries and avoid rework.
Currently covering the most popular Java, JavaScript and Python libraries. See a Sample of usb

Get all kandi verified functions for this library.

usb Key Features

No Key Features are available at this moment for usb.

usb Examples and Code Snippets

No Code Snippets are available at this moment for usb.

Community Discussions

Trending Discussions on usb

How to detect shutil.copytree is done copying?

How to create in C or C++ the contents value of Sig type object for digital signature in PDF?

Difficult To Connect Thermal Printer via Web Bluetooth

How do I silence PyAudio's noisy output?

Arduino Uno, PLX-DAQ and 125Khz RFID reader problem

Torify/torsocks ssh only working from device itself, and not from other devices

How to transfer data(QR Code) from system to Paytm Dynamic QR device

Not able to locate the DMG image to make macos catalina bootable usb

How to read register of digital counter with minimalmodbus

How do I enable Feature/Permissions Policy in an iframe in Google Add-ons?

QUESTION

How to detect shutil.copytree is done copying?

Asked 2021-Jun-15 at 13:30

I use python 3.8 on archlinux. I use shutil.copytree to copy a folder into a usb key. When i check into the usb after copy, the folder is correctly copied, but i see that my usb key that has a ticking led is still writing. If i eject my usb key before the ticking is over and reconnect it, i see that the folders are not entirely copied. Means that my OS (archlinux) thinks that the copy is done, but it's not. Any ideas ?

...

ANSWER

Answered 2021-Jun-15 at 13:30

It seems like the copy has logically finished, but hasn't been fully written to the physical USB flash drive. That is to say, your OS has cached some of the data from the copy, and will actually write it to the drive at a later time, but definitely before the drive is unmounted.

To check if this is the case, you can check (either within Python or through some other program) if the copy has completed once the code has moved on past shutil.copytree. If it has, then the issue is almost certainly that the USB flash drive was not safely ejected.

You should be able to solve this by unmounting (i.e. safely ejecting) the USB flash drive before removing it.

Source https://stackoverflow.com/questions/67987178

QUESTION

How to create in C or C++ the contents value of Sig type object for digital signature in PDF?

Asked 2021-Jun-15 at 06:14

We are programmatically creating PDF using our in house lib (C++) by adding all the required objects so that PDF readers can render them properly. Currently we are enhancing the lib to support digital signatures in PDF. Our users will use USB token or Windows certificates to sign the PDF. On studying raw PDF file with digital signature, we were able to make sense of all the objects except for the contents of Sig type object.

...

ANSWER

Answered 2021-Jun-10 at 16:48

Ok, the signature container is embedded correctly.

But there are issues with the signature container itself:

Both in the SignedData.digestAlgorithms collection and in the SignerInfo.digestAlgorithm value you have used the OID of SHA1withRSA, but that is a full signature algorithm, not the mere digest algorithm SHA1 expected there.
Then the SHA1 hash of the signed bytes is BB78A402F7A537A34D6892B83881266501A691A8 but the hash you signed is 90E28B8A0D8E48691DAFE2BA10A4761FFFDCCD3D. This might be because you hash buffer2 and

buffer2 has empty contents data (/Contents <>)

The hex string delimiters '<' and '>' also belong to the contents value and, therefore, must also be removed in buffer2.

Furthermore, your signature is very weak:

It uses SHA1 as hash algorithm. SHA1 meanwhile has been recognized as too weak a hash algorithm for document signatures.
It doesn't use signed attributes, neither the ESS signing certificate nor the algorithm identifier protection attribute. Many validation policies require such special attributes.

Source https://stackoverflow.com/questions/67667032

QUESTION

Difficult To Connect Thermal Printer via Web Bluetooth

Asked 2021-Jun-14 at 10:38

Right now I am developing web which has ability to connect thermal printer. I am using angular framework, and I successfully connect the thermal printer with USB using library ng-thermal-printer. But I want to my web also being able to connect thermal printer via web bluetooth which is BLE (Bluetooth Low Energy). As far as I know, BLE has specification in term of GATT and has services and characteristics in it.

The progress I did so far, I can connect and send a value to the thermal printer device in a Service and a Characteristic, let's say Service with UUID AS and Characteristics with UUID AC, using my android phone with the help of application named nRF Connect. Targeting Service AS and send hexadecimal value at charateristic AC make me successfully print something on the thermal paper.

But there is a problem. After knowing the right service and characteristic. I implemented it in my project. But, my chrome browser console showed error:

Origin is not allowed to access any service... and it told me to add optionalServices when requestiDevice()
After I added Service AS in property optionalServices, the console showed error DOMException: Connection failed for unknown reason. The errors showed both in chrome PC and chrome android.

NB:

I have enabled Experimental Web Platform features on chrome
I have enabled Use the new permissions backend for Web Bluetooth on chrome
I have enabled Allow invalid certificates for resources loaded from localhost. on chrome
I have enabled Enable new USB backend on chrome
I have used https.

Additional question. is bluetooth connection that application nRF Connect used different from BLE? if so, why it displays services and characteristics?

...

ANSWER

Answered 2021-Jun-14 at 07:34

I'd recommend you try sending those hex values directly from the about:bluetooth-internals page and see if you can reproduce the connection error from there as well. See https://web.dev/bluetooth/#tips

If so, check out https://www.chromium.org/developers/how-tos/file-web-bluetooth-bugs to learn how to properly file a chromium bug so that the team can fix the underlying issue.

If not, could you share your JS code so that we can help you diagnose what could be going wrong in your code?

Source https://stackoverflow.com/questions/67947790

QUESTION

How do I silence PyAudio's noisy output?

Asked 2021-Jun-13 at 20:51

I've installed PyAudio and it's working exactly as I want it to, both for playing and recording audio. However, every time I initialise a PyAudio object, it barfs a whole bunch of warnings and error into STDERR and it's making it difficult to sort through my own application's logs. Here's a sample out of an ipython session:

...

ANSWER

Answered 2021-Jun-13 at 20:51

The problem was that PyAudio loads a bunch of non-Python stuff whenever it's envoked, and it's that's stuff that's printing to STDOUT so it has to be silenced directly. The cleanest way to do this is to wrap it in a context manager that silences STDOUT for the shortest amount of time possible:

Source https://stackoverflow.com/questions/67765911

QUESTION

Arduino Uno, PLX-DAQ and 125Khz RFID reader problem

Asked 2021-Jun-13 at 12:23

Project largely working. Have a 125Khz RFID module on an Arduino Uno, with SD card module and and RTC, all working nicely and passing data via PLX-DAQ to Excel and storing data to SD card.

I need a way of working out when the Uno is connected via PLX-DAQ to USB/serial, or when the Uno is just on battery.

So I thought to set a particular cell on Excel with the PLX-DAQ form macro in VBA to 1 (when connected) or 0 (disconnected) then read that in the Arduino code to determine whether to pass data via serial to excel or pull stored data off SD card.

The cell J4 toggles 0 or 1 according to whether disconnected / connected.

I then use the GET function of PLX-DAQ to read a cell from the Arduino sketch.

To upload the sketch I have to disconnect the connection between the RFID Tx and Arduino Rx or I get an error, which is normal, and if I run the sketch with that wire disconnected GET works fine.

...

ANSWER

Answered 2021-Jun-12 at 01:54

I assume you leave the arduino TX wire connected to the PC-RX. Thats why your PLX-DAQ still has the input. And as you suspect nothing will be going back.

First I thought, since nothing will come back, so your code will be stuck on

Source https://stackoverflow.com/questions/67829434

QUESTION

Torify/torsocks ssh only working from device itself, and not from other devices

Asked 2021-Jun-12 at 08:34

While setting up ssh over tor I determined that the ssh only works from the device I try to access (deviceA), but not from another device (deviceB).

I get a fresh install of Ubuntu Server 20.04 LTS, verify it is connected through wifi to the internet, completed the sudo apt update and upgrade commands successfully, rebooted successfully, and ran: sudo apt install tor. Next, I ran

...

ANSWER

Answered 2021-Jun-12 at 08:34

The essence of the issue was the assumption that torify sets up a tor connection, which it did not by itself. Furthermore, running:

Source https://stackoverflow.com/questions/67941677

QUESTION

How to transfer data(QR Code) from system to Paytm Dynamic QR device

Asked 2021-Jun-11 at 14:43

As we know, Paytm has launched a Dynamic QR device to display invoice/bill QR Code image.

I have to integrate this device with a billing system(POS), where I have to send QRCode data to this device.

I have to integrate it using C#.NET

Note:- As per the device guidelines, we can transfer data from system to device using USB Port(the serial port communication) Reference

...

ANSWER

Answered 2021-Apr-10 at 06:39

I got the solution after a discussion with Paytm Development Team. They have shared an SDK along with an API that is used to transfer data from POS(PC) to the Paytm Dynamic QR display device.

This SKD has basically main three methods:

Show Home Screen on display
Show QRCode on display
Show Payment Success message on display

Source https://stackoverflow.com/questions/66649004

QUESTION

Not able to locate the DMG image to make macos catalina bootable usb

Asked 2021-Jun-10 at 07:20

I have a mac mini where i am trying to make a bootable usb with macos catalina on it. but trouble is since the latest big sur release you cannot find the .DMG file of older OS any where.

I tried searcing in search engines and no luck.

Can anyone help on this?

...

ANSWER

Answered 2021-Jun-10 at 07:20

If you go to this link: https://support.apple.com/en-in/HT201372 here you can find the OS of your choice. I have a mac machine in which i got this link: https://apps.apple.com/us/app/macos-catalina/id1466841314?mt=12 which redirects me to the macos appstore to download Catalina directly.

Give it a try. (I am able to Download the .DMG file successfully)

Source https://stackoverflow.com/questions/67916435

QUESTION

How to read register of digital counter with minimalmodbus

Asked 2021-Jun-10 at 05:34

I'm trying to read the values of an industry digital counter with Modbus RTU RS-485. Using USB-RS-485 conversion, and here is the master send code is taken from the following datasheet,

Datasheet Link

I am expecting that the read input register is what I'm expecting, and the API of the minimalmodbus expects to specify register number, a number of decimals, and function code.

Does the library auto-assign the slave number, or we have to define it?
From the datasheet, is it the register number is the address?
And how many decimals do I expect if there's two data sequence as a response?
Is the CRC16 check already included within the library as i shouldn't code it?

Here's my code by far, modifying examples.

...

ANSWER

Answered 2021-Jun-10 at 05:34

Does the library auto-assign the slave number, or we have to define it?

With MinimalModbus you pass the slave ID through in the minimalmodbus.Instrument('/dev/ttyUSB0', 1) call (the 1 is the Slave ID). How you set the slave ID on the device itself varies (this is not covered by the Modbus over serial line spec; could be a configuration program, DIP switches, based on the serial number etc. Other libraries may take different approaches (for example defaulting to Slave ID 1).

From the datasheet, is it the register number is the address?

The header in the spec tables says "No(Address)" so "10001(0000)" means register 1, address 0 (these refer to the same thing; I recommend reading the "Modbus: When 40001 Really Means 1, or 0 Really Means 1" section in this article which explains some of the issues around addressing).

And how many decimals do I expect if there's two data sequence as a response?

Not quite sure what you mean by "two data sequence". The Modbus spec only details the sending of bits (coils) and 16 bit values (input/holding registers). From a quick look at your spec it looks like this device just uses a single registers; for instance "OUT1 Output time" has "unit: ×10㎳" so take whatever is in the register and divide by 10 to get ms.

Is the CRC16 check already included within the library as i shouldn't code it?

Any decent Modbus library will look after the protocol details (such as CRC) for you (so no you don't need to code this; MinimalModbus will calculate it for you)

Source https://stackoverflow.com/questions/67913346

QUESTION

How do I enable Feature/Permissions Policy in an iframe in Google Add-ons?

Asked 2021-Jun-09 at 18:03

I am trying use a feature policy, serial, in my google add-on. I am having difficulty trying to enable this particular feature policy inside an iframe, mainly I believe is because the parent iframes don't have it enabled. Below is what the iframe DOM tree looks like. I don't have access to "sandboxFrame" and "userHtmlFrame" directly, so I cannot change its allowed features. Even if I set 'serial' in the most child iframe, I cannot find the 'serial' feature enabled in its featurePolicy.

...

ANSWER

Answered 2021-Jun-09 at 16:28

Yes, you can pass any permission into nested iframe only if parent context has that permission granted.
Keep in mind that when passing permissions the origin will be changed accordingly, i.e:

</code> <code> // the permission for fullscreen is 'self' (== http://example.com)</code> <code> // but main thing is this is that iframe HAS that permission, therefore</code> <code> // it can grant it to any nested context with ANY origin:</code> <code> <iframe src='https://www.youtube.com' allow="fullscreen https://www.youtube.com"></code> <code> // will get permission of fullscreen mode for https://www.youtube.com origin</code> <code>

In the parent iframe the serial Feature Policy directive is not specified in the allow='...' attribute. That means this feature is allowed with the default value - 'src'. Therefore parent iframe has implicitly permission for serial, so it can pass it into any nested iframe.
I hear nothing about the serial Feature Policy directive, is it supported?

Source https://stackoverflow.com/questions/67907540

Community Discussions, Code Snippets contain sources that include Stack Exchange Network

Vulnerabilities

No vulnerabilities reported

Install usb

You can download it from GitHub.

Support

For any new features, suggestions and bugs create an issue on GitHub. If you have any questions check and ask questions on community page Stack Overflow .

Find more information at: