iio oscilloscope
The ADI IIO Oscilloscope™ is an example application, which demonstrates how to interface different evaluation boards from within a Linux system. The application supports plotting the captured data in four different modes: time domain, frequency domain, constellation and cross-correlation. The application also allows viewing and modifying several settings of the evaluation board's devices.
Download IIO Oscilloscope™ for Windows or Linux versions from this web site: https://github.com/analogdevicesinc/iio-oscilloscope/releases
Note 1: It is recommended to use the 0.10 release.
Note 2: IIO Oscilloscope™ is already pre-installed in the VM.
To build on a host, you must:
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make sure the following libraries are installed. This list is maintained in the adi_update_tools.sh shell script, and can be copied/pasted to most Debian based distributions. For others - make sure they are installed, or the below steps will not work. If you are not sure how to do this - consult your distribution documentation.
$ apt-get -y install libglib2.0-dev libgtk2.0-dev libgtkdatabox-dev libmatio-dev libfftw3-dev libxml2 libxml2-dev bison flex libavahi-common-dev libavahi-client-dev libcurl4-openssl-dev libjansson-dev cmake libaio-dev -
build and install the libiio library, by following these how_to_build_it_instructions. Make sure to do the final make install
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build and install the libad9361-iio library.
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download the source
$ git clone https://github.com/analogdevicesinc/iio-oscilloscope.git
$ cd iio-oscilloscope
$ git checkout origin/master
Or, download a zip, and uncompress it:
$ wget https://github.com/analogdevicesinc/iio-oscilloscope/archive/master.zip
$ unzip master.zip
$ cd iio-oscilloscope
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and run make and make install. If you did not do a make install of the libiio, the libiio install location needs to be set in your path ie:
PATH=/usr/lib:$PATH
or else the error Package libiio not found.. will occur:
$ make -j 4
$ sudo make install
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if you don't want to do a make install (sometimes I don't), you will need to make sure that the most recently built shared libraries can be found, by setting the LD_LIBRARY_PATH environmental variable.
$ export LD_LIBRARY_PATH=./
otherwise you may get an error like this:
$ ./osc
./osc: error while loading shared libraries: libosc.so: cannot open shared object file:
No such file or directory
Or, worse case, when you are debugging things, you will see your modified source code, but it will be running/executing the older shared shared object which was loaded (since it didn't find things in the library path).
For macOS install libiio and libad9361 from source or using pkg's on the associated release pages.
Then using brew install IIO-Scope:
brew install --HEAD tfcollins/homebrew-formulae/i-i-o-oscilloscope
To start the IIO Oscilloscope™, open up the start menu of your system and search for IIO Oscilloscope. E.g. if you are using a Ubuntu Linux system move your mouse cursor to the left side of your screen and Dash home button and in the search box type
IIO Oscilloscope
- Settings -> Connect and enter the IP address in the popup window, and Refresh.
This will populate the iio devices available. Click OK.
When IIO Oscilloscope™ is processing a command, it goes grey indicating a busy status.
Each plugin (or tab) can be detached from the main window simply by clicking on the button placed on the right side of the name of the plugin. Close the detached window to attach the plugin back to the main window.
The Main Window is designed to display a configuration panel (plugin) for each device recognized by the system. Additional plugins will be loaded for device debugging and monitoring purposes such as:
The DMM Plugin: The Digital Multimeter continuously displays device specific data once the start button is activated.
- Device tab: Displays the list of all available devices.
- Active channels tab:Displays the list of channels that belong to the enabled devices. All channels can be enabled simultaneously by using the All Channels button.
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Right side tab: Displays data readings of the enabled channels in Active channels tab.
Debug Plugin: Is a tool for device debugging. Since normal users should not be doing this, features on this tab may not work unless you have started the osc application as root (try sudo osc in a terminal).
- Device Selection: Sets the active device. Once a device is selected any other information displayed in the plugin is related to this particular device.
- IIO Device Attributes: Allows Read/Write operation for the attributes of a device.
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Register: Provides low level access to the registers of the device.
- Detailed Register Map: When enabled it displays a graphical representation of a register and groups the bits by their functionality. When disabled the newly displayed option (Register Map Type) allows the selection of the register map to be used. SPI registers refer to the internal registers of the device while the AXI Core registers belong to the HDL core associated with the device.
- Enable AutoRead: When enabled it allows the register to be read automatically as the register address changes.
- Address: The address of the register.
- Value: The value of the register at the given address.
There may be hardware specific plugins/tabs, specific to the platform you are running on. Here are a few:
The Capture Window is where device data is displayed.
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Settings
- Device list: Lists all available ADCs and the corresponding channels. It allows selecting the channels to be displayed.
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Plot type
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Time domain: Plots the signal in the time domain. Displays the raw samples.
- Sample count: Selects the number of samples for time domain, constellation and cross-correlation plotting
- Graph Type: Selects the type of all graphs: lines or dots.
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Frequency domain: Plots the signal in the frequency domain. Performs an FFT on the signal and displays it.
- FFT size: Selects the size of the FFT for frequency domain plotting
- FFT Average: Selects the average weight to be applied to the FFT samples.
- PWR Offset: Selects the offset of the FFT graph.
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Constellation: Plots the signal as a constellation plot. The I-channel will be plotted on the X-axis and the Q-channel on the Y-axis.
- Sample count: Selects the number of samples for time domain, constellation and cross-correlation plotting
- Graph Type: Selects the type of all graphs: lines or dots.
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Cross Correlation: Plots the signal as a cross-correlation plot.
- Sample count: Selects the number of samples for time domain, constellation and cross-correlation plotting
- Graph Type: Selects the type of all graphs: lines or dots.
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Time domain: Plots the signal in the time domain. Displays the raw samples.
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Info
- Markers : Displays marker measurements.
- Devices : Displays Device info (sample rate)
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Plot Options/Icons (along top of window)
- Capture/stop : Starts or stops the data capture.
- Zoom In : Zooms in on a region of the plot.
- Zoom Out : Zooms out from a region of the plot.
- AutoZoom : Zooms automatically for the signal to fit the screen.
- Save As : Saves data to file.
- FullScreen : Enters/leaves fullscreen.
- Auto scale : When enabled the visible area will automatically be re-scaled to fit the entire plot.
- Show grid : Shows or hides the grid in the plot window.
- Y Max : Adjusts the upper limit of the vertical axis when Auto scale is disabled.
- Y Min : Adjusts the lower limit of the vertical axis when Auto scale is disabled.
- New Plot : Creates a new plot of the same type.
Markers are used for plot data measurement in when looking in the frequency domain or cross correlations. To activate the markers right click on the plot and select from the marker menu the type of marker you want to enable. Make sure the capture process is running and the appropriate domain is selected in order to enable the markers properly. The following types of markers are available:
- FFT domain (1 channel enabled): Peak, Fixed and Single Tone markers.
- FFT domain (2 channels enabled): Peak, Fixed, Single Tone and Image markers.
- Constellation: Peak marker.
The enabling of a marker will display a set of 5 markers by default. You can add more markers by selecting Add Marker from the marker menu and remove some by selection Remove Maker.
Fixed markers are designed to have their position moved by the user. Once the fixed markers are visible on the plot right click on the marker symbol and while holding the right button pressed move the mouse to the desired location on the plot and release the right button.
To disable the markers select Markers Off from the marker menu.
Once the data is captured, it can be saved using one of the following formats:
- Agilent VSA
- .csv
- .mat
- .png
Click on File→Save As to open the dialog needed to save the data.
- Simple math operation can be applied to the channel data. Right click on the name of a channel listed in the Device list and select Math Settings to open the menu with the math operations.
- The graph color associated with the channel can be modified. Right click on the name of the channel and select Color Settings to open a color selection panel that will allow you to pick the desired color.
The settings can be applied only in Time domain.
In time domain, it is possible to select a capture channel as the trigger source of the oscilloscope. To do so, right-click on the name of the device used for capture, and select Trigger settings. The pop-up window that will open will allow you to configure the channel used for the trigger, as well as the trigger level and edge.
Several waveforms are provided with the application for demonstration purposes, which can be loaded into different devices. However, these are generally not meant for transceiver characterization or demodulation. If you want to do such tasks, we would recommend creation of your own waveforms from tools such as MATLAB.
The source code for the entire application is at github. You can ask questions about it on the EngineerZone.
If you want to make your own plugin, please refer to the Internals page.
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