OS - Linux: Difference between revisions

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Phidgets can run on Linux directly using USB, or remotely over a network using the [[Phidget Webservice]]. 
<metadesc>Communicate over USB with sensors, controllers and relays with Phidgets! Program in Linux using a wide variety of programming languages.</metadesc>
[[Category:OS]]
{|
|style="vertical-align:middle; width: 60%;"|
==Getting Started with Linux==
Welcome to using Phidgets with Linux!


You need kernel '''version 2.6''' or later.
If you are ready to go, the first step in creating Linux applications with Phidgets is installing our libraries.
|{{TOC limit|3}}
|}
===Install===
The first step to using Phidgets with Linux is installing the Phidget22 libraries.
{{LinuxSupport}}
If you're running one of the supported distros, we recommend using the '''Package Install'''. For other systems, you can use the '''Source Install'''.  


==Getting Started (Libraries and Drivers)==
<div class="bigTabs">
<tabber>
Package Install=
====Install Script====
To run the install script and install phidget22, enter the following command in the terminal:


Linux does not have a graphical user interface to check your Phidget, but it does have a complete API for many languages.
{{LinuxInstallScript}}


For any language, you will need the basic Phidget Libraries for Linux:
====Manual Install====
To install our package repository manually, enter the following command in the terminal, replacing ''distro'' with your distro codename:


*[http://www.phidgets.com/downloads/libraries/libphidget_2.1.8.20110615.tar.gz Phidget Libraries]
{{LinuxGetKey}}


===Installing===
We support Debian releases from 6 to current, and Ubuntu LTS releases from 14.04 to current. If you are using another flavour of Linux (such as Mint), which is based on Ubuntu or Debian, use the corresponding Ubuntu or Debian codename.


To install the libraries, follow these steps:
Update your package lists:
{{LinuxAptUpdate}}


#Download '''libusb-0.1''' and its development libraries
Finally, install the Phidget package by entering the command below:
#*Try <code>apt-cache search libusb</code> in a terminal to find current packages
{{LinuxAptInstall}}
#*Or install [http://www.libusb.org/ from source], which includes the libusb development libraries
#Unpack and install the '''Phidget Libraries''' for Linux (download above)
#*From the main libraries directory, run:
#*:<code>./configure</code>
#*:<code>make</code>
#*:<code>sudo make install</code>
#*This will compile phidget21.h and place the library into your gcc path


===Checking===
====Additional Packages====
You may also want to apt-get install the following optional packages:
* '''libphidget22-dev''': The C development libraries for Phidget22
* '''libphidget22extra''': Extra runtime library required for the Network Server and Admin tools
* '''phidget22networkserver''': The [[Phidget Network Server]], which enables use of Phidgets over your network
* '''libphidget22java''': The Java libraries for Phidget22
* [[Phidget22admin Guide|'''phidget22admin''']]: An administrator utility for listing Phidgets and upgrading firmware
* '''phidget22wwwjs''': The JavaScript libraries for Phidget22. This package also installs the HTML examples which can be accessed through the web interface


To confirm that the libraries were installed correctly, you can use the Phidget C Examples:


*[http://www.phidgets.com/downloads/examples/phidget21-c-examples_2.1.8.20111028.tar.gz Phidget C Examples]
The libraries are now installed on your machine. Next, set up the UDev rules below.


Although the libraries are written in C, the libraries for Python, Java, and most other Phidget-supported languages depend on them.
|-|
Source Install=
====Source Install====
To install our libraries, first install libusb-1.0 development libraries. The exact command and package name will vary depending on distribution. For Debian based distributions, including Ubuntu and Mint, the command would be:
<syntaxhighlight lang=bash>
apt-get install libusb-1.0-0-dev
</syntaxhighlight>


The easiest way to confirm that the libraries got compiled correctly and installed in the right place will be to compile and run the HelloWorld C example.  This does not involve writing any C code, but it does involve compiling the example and running it, as we show below.  If you feel more comfortable running the HelloWorld example for your specific language, you can skip below and pick your language, but keep in mind that any problems could be with the C library installation and not necessarily with your language.


To compile and run the basic C example for checking your installation:
Next, download and unpack the following files:
*[https://cdn.phidgets.com/downloads/phidget22/libraries/linux/libphidget22.tar.gz libphidget22] (Mandatory)
*[https://cdn.phidgets.com/downloads/phidget22/libraries/linux/libphidget22extra.tar.gz libphidget22extra] (Optional - needed by NetworkServer and Admin)
*[https://cdn.phidgets.com/downloads/phidget22/libraries/linux/libphidget22java.tar.gz libphidget22java] (Optional - Java Libraries)
*[https://cdn.phidgets.com/downloads/phidget22/servers/linux/phidget22networkserver.tar.gz phidget22networkserver] (Optional - [[Phidget Network Server]])
*[https://cdn.phidgets.com/downloads/phidget22/tools/linux/phidget22admin.tar.gz phidget22admin] (Optional - Phidget Admin Tool)
Open the README file that is included at the top of each directory. This file will give you important information about how to properly install the files.


1. Unpack the '''Phidget C Examples''' (download above)<br>
2. Open a terminal (often Ctrl-Alt-T) and go to the directory where the examples are unpacked<br>
3. Compile the <code>HelloWorld.c</code> example:<br>
<div style="background-color: #f3f3f3; border-color: #1c9edb; border-width:1px; border-style: dashed;">
<font size="3">
<source lang=bash>


    gcc HelloWorld.c -o HelloWorld -lphidget21
Libraries are installed in /usr/local/lib by default. If you run into trouble finding the libraries during linking or at runtime, this probably means that /usr/local/lib is not on the library path for your distribution.


</source>
You can handle this in a number of ways:
</font>
 
Specify a different install folder during compile
<syntaxhighlight lang=bash>./configure --prefix=/usr && make && sudo make install</syntaxhighlight>
OR Add /usr/local/lib to the system-wide library path
<syntaxhighlight lang=bash>echo /usr/local/lib >> /etc/ld.so.conf && sudo ldconfig</syntaxhighlight>
OR Add /usr/local/lib in your local shell every time
<syntaxhighlight lang=bash>export LD_LIBRARY_PATH=$LD_LIBRARY_PATH:/usr/local/lib</syntaxhighlight>
 
The libraries are now installed on your machine. Next, you should set the UDev Rules.
</tabber>
</div>
</div>
4. Run the <code>HelloWorld</code> example:<br>
<div style="background-color: #f3f3f3; border-color: #1c9edb; border-width:1px; border-style: dashed;">
<font size="3">
<source lang=bash>


    sudo ./HelloWorld
=== Setting UDev Rules ===
By default, Linux will not grant permission to regular users to access physical hardware as a security feature.  This means that in order to run Phidgets code from user space you must grant yourself root privileges via sudo. For example:


</source>
sudo ./HelloWorld
</font>
</div>
:(The sudo is needed for USB access for now)


The <code>-lphidget21</code> will look in the standard library location for your Linux distribution (usually <code>/usr/lib/</code>) for the Phidget 21 library file.  Generally, libraries to be linked on Linux through <code>gcc</code> have a naming convention.  For example, <code>-lphidget21</code> looks for the binary files libphidget21.a and libphidget21.so in the library location.
You can grant access manually or, more commonly, set up a rules file to do it automatically keying off of the vendor code for Phidget USB devices.  To do this, create a text file called "99-libphidget22.rules" with the following contents:


The HelloWorld program will simply print out basic information for any device you plug in, and print a message upon unplugging the device.  For example, starting the program, plugging in an Interface Kit Phidget, unplugging the Interface Kit, and pressing Enter displays:
# All current and future Phidgets - Vendor = 0x06c2, Product = 0x0030 - 0x00af
SUBSYSTEMS=="usb", ACTION=="add", ATTRS{idVendor}=="06c2", ATTRS{idProduct}=="00[3-a][0-f]", MODE="666"


<div style="background-color: #f3f3f3; border-color: #1c9edb; border-width:1px; border-style: dashed;">
Where mode 666 means every user has permission to read and write to the specified file/device.  You need to then move this file to "/etc/udev/rules.d".  Now you can run Phidget related code as a regular user without the OS denying permission. 
<font size="3">
<source lang=bash>


  $ sudo ./HelloWorld
===Verify===
 
The best way to verify that your libraries are working properly is to compile and run an example program.
  Opening...
  Press Enter to end


  Hello to Device Phidget InterfaceKit 8/8/8, Serial Number: 37299
  Goodbye Device Phidget InterfaceKit 8/8/8, Serial Number: 37299


  Closing...
First, download and unpack this C example:
*[https://cdn.phidgets.com/downloads/phidget22/examples/c/Manager/Phidget22_HelloWorld_C_Ex.zip HelloWorld C example]


</source>
'''Note:''' If using the Debian intallation methods, you will need to install the '''libphidget22-dev''' package to use the C libraries for Phidget22
</font>
</div>


==Programming Languages==
Next, open the terminal at the example location. Compile the example by entering the following command:
<syntaxhighlight lang=bash>
gcc HelloWorld.c -o HelloWorld -lphidget22
</syntaxhighlight>


Now that you have the basic libraries installed, you can pick your language and begin programming! 


If you are not using the [[#Webservice | webservice]] (discussed below) to control a Phidget over a network, your next step will be to delve into the use of your specific language.  Each page has its own set of specific libraries, code examples, and setup instructions.
Run the HelloWorld example:
<syntaxhighlight lang=bash>
./HelloWorld
</syntaxhighlight>


On Linux, we recommend the following languages:


*[[Language - C/C++|C/C++]]
Your terminal should look something like this:
*[[Language - Java | Java]]
[[File:linux_helloworld.PNG|link=|center]]
*[[Language - Python | Python]]
*[[Language - C Sharp | C#]] (Using [[Language - C Sharp#Mono|Mono]])
*[[Language - Flash AS3 | Flash AS3]]


You can also use these languages, but they do not support [[General Phidget Programming#Event Driven Code | event driven code]], and must use [[General Phidget Programming#Logic Code | logic code]] only:


*[[Language - MATLAB|MATLAB]]
The HelloWorld program will simply communicate when a Phidget has been attached or detached, as can be seen in the image above.


==Webservice==


The Phidget Webservice allows you to remotely control a Phidget over a network.<br>
Your Phidget is now able to communicate with your development machine. The next step is selecting a programming language so you can start to write some code!
Before using these webservice drivers, it may help to learn about how the [[Phidget Webservice]] works.


*[http://www.phidgets.com/downloads/libraries/phidgetwebservice_2.1.8.20111028.tar.gz Linux Phidgets Webservice] libraries
==Programming==
*The Webservice on Linux uses <code>avahi</code>
Ready to write some code? Select one of the programming languages below:


==Common Problems and Solutions==
{{Programming_Languages_Table}}


None yet, yay!
==Older Versions==
If you need older versions of the Phidget22 Linux libraries, [{{SERVER}}/downloads/phidget22/libraries/linux/libphidget22/ click here].


Maybe talk about udev rules?
If you need Phidget21 Linux Libraries, [{{SERVER}}/downloads/phidget21/libraries/linux/libphidget/ click here].

Latest revision as of 15:45, 9 September 2024

Getting Started with Linux

Welcome to using Phidgets with Linux!

If you are ready to go, the first step in creating Linux applications with Phidgets is installing our libraries.

Install

The first step to using Phidgets with Linux is installing the Phidget22 libraries.

Supported Distros / Archs
Debian 6 (Squeeze) i386 armel
Debian 7 (Wheezy)
Debian 8 (Jessie) armhf
Debian 9 (Stretch)
Debian 10 (Buster) amd64 arm64
Debian 11 (Bullseye)
Debian 12 (Bookworm)
Ubuntu Xenial 16.04 LTS i386 armhf
Ubuntu Bionic 18.04 LTS amd64 arm64
Ubuntu Focal 20.04 LTS
Ubuntu Jammy 22.04 LTS
Ubuntu Noble 24.04 LTS

If you're running one of the supported distros, we recommend using the Package Install. For other systems, you can use the Source Install.

Install Script

To run the install script and install phidget22, enter the following command in the terminal: 

curl -fsSL https://www.phidgets.com/downloads/setup_linux | bash -
apt-get install -y libphidget22


curl -fsSL https://www.phidgets.com/downloads/setup_linux | sudo -E bash -
sudo apt-get install -y libphidget22

Manual Install

To install our package repository manually, enter the following command in the terminal, replacing distro with your distro codename: 

wget -qO /usr/share/keyrings/phidgets.gpg \
  https://www.phidgets.com/gpgkey/pubring.gpg
echo deb [signed-by=/usr/share/keyrings/phidgets.gpg] \
  http://www.phidgets.com/debian distro main \
  > /etc/apt/sources.list.d/phidgets.list


sudo wget -qO /usr/share/keyrings/phidgets.gpg \
  https://www.phidgets.com/gpgkey/pubring.gpg
echo deb [signed-by=/usr/share/keyrings/phidgets.gpg] \
  http://www.phidgets.com/debian distro main | sudo tee \
  /etc/apt/sources.list.d/phidgets.list > /dev/null

We support Debian releases from 6 to current, and Ubuntu LTS releases from 14.04 to current. If you are using another flavour of Linux (such as Mint), which is based on Ubuntu or Debian, use the corresponding Ubuntu or Debian codename.

Update your package lists: 

apt-get update


sudo apt-get update

Finally, install the Phidget package by entering the command below: 

apt-get install libphidget22


sudo apt-get install libphidget22

Additional Packages

You may also want to apt-get install the following optional packages:

  • libphidget22-dev: The C development libraries for Phidget22
  • libphidget22extra: Extra runtime library required for the Network Server and Admin tools
  • phidget22networkserver: The Phidget Network Server, which enables use of Phidgets over your network
  • libphidget22java: The Java libraries for Phidget22
  • phidget22admin: An administrator utility for listing Phidgets and upgrading firmware
  • phidget22wwwjs: The JavaScript libraries for Phidget22. This package also installs the HTML examples which can be accessed through the web interface


The libraries are now installed on your machine. Next, set up the UDev rules below.

Source Install

To install our libraries, first install libusb-1.0 development libraries. The exact command and package name will vary depending on distribution. For Debian based distributions, including Ubuntu and Mint, the command would be: 

apt-get install libusb-1.0-0-dev


Next, download and unpack the following files:

Open the README file that is included at the top of each directory. This file will give you important information about how to properly install the files.


Libraries are installed in /usr/local/lib by default. If you run into trouble finding the libraries during linking or at runtime, this probably means that /usr/local/lib is not on the library path for your distribution.

You can handle this in a number of ways:

Specify a different install folder during compile 

./configure --prefix=/usr && make && sudo make install

OR Add /usr/local/lib to the system-wide library path 

echo /usr/local/lib >> /etc/ld.so.conf && sudo ldconfig

OR Add /usr/local/lib in your local shell every time 

export LD_LIBRARY_PATH=$LD_LIBRARY_PATH:/usr/local/lib

The libraries are now installed on your machine. Next, you should set the UDev Rules.

Setting UDev Rules

By default, Linux will not grant permission to regular users to access physical hardware as a security feature. This means that in order to run Phidgets code from user space you must grant yourself root privileges via sudo. For example:

sudo ./HelloWorld

You can grant access manually or, more commonly, set up a rules file to do it automatically keying off of the vendor code for Phidget USB devices. To do this, create a text file called "99-libphidget22.rules" with the following contents:

  1. All current and future Phidgets - Vendor = 0x06c2, Product = 0x0030 - 0x00af

SUBSYSTEMS=="usb", ACTION=="add", ATTRS{idVendor}=="06c2", ATTRS{idProduct}=="00[3-a][0-f]", MODE="666"

Where mode 666 means every user has permission to read and write to the specified file/device. You need to then move this file to "/etc/udev/rules.d". Now you can run Phidget related code as a regular user without the OS denying permission.

Verify

The best way to verify that your libraries are working properly is to compile and run an example program.


First, download and unpack this C example:

Note: If using the Debian intallation methods, you will need to install the libphidget22-dev package to use the C libraries for Phidget22

Next, open the terminal at the example location. Compile the example by entering the following command: 

 gcc HelloWorld.c -o HelloWorld -lphidget22


Run the HelloWorld example: 

./HelloWorld


Your terminal should look something like this:

Linux helloworld.PNG


The HelloWorld program will simply communicate when a Phidget has been attached or detached, as can be seen in the image above.


Your Phidget is now able to communicate with your development machine. The next step is selecting a programming language so you can start to write some code!

Programming

Ready to write some code? Select one of the programming languages below:

Core Languages Mobile Languages Other Languages
C Sharp C# Objective C Objective C LabVIEW LabVIEW
C/C++ C/C++ Swift Swift Max/MSP Max/MSP
Python Python Android Android Java
Java Java
Visual Basic .NET Visual Basic .NET
JavaScript JavaScript

Older Versions

If you need older versions of the Phidget22 Linux libraries, click here.

If you need Phidget21 Linux Libraries, click here.

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