IIO Oscilloscope

The ADI IIO Oscilloscope is a example application, which demonstrates how to interface to the AD-FMCOMMS1 board form within a Linux system. The application supports plotting of the captured data in three different modes (time domain, frequency domain and constalation). The application also allows to view and modify several settings of the AD-FMCOMMS1 board's RX and TX paths.

You can either download the IIO Oscilloscope here from the wiki or checkout the latest version from the git repository.

IIO Oscilloscope download

Git: https://github.com/analogdevicesinc/iio-oscilloscope / git://github.com/analogdevicesinc/iio-oscilloscope.git

The IIO Oscilloscope uses the GTK+ and gtkdatabox libraries. Before the IIO Oscilloscope can be build the and packages need to be installed.

> sudo apt-get install libgtkdatabox-0.9.1-1-dev libgtk2.0-dev

To build and install the IIO Oscilloscope you need to unpack the tar archive and run `make` and `make install` in the osc folder.

> wget http://wiki.analog.com/_media/resources/tools-software/linux-software/osc.tar.bz2
> tar -xjf osc.tar.bz2
> cd osc
> make
> sudo make install

To start the IIO Oscilloscope open up the start menu of your system 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 type “IIO Oscilloscope” into the search box.

• Active channels: Allows to select the to be displayed channels.
• Plot type
  • Time domain:: Plot the signal in the time domain. Displays the raw samples.
  • Frequency domain: Plot the signal in the frequency domain. Performs a FFT on the signal and displays it.
  • Constalation: Plot the signal as a constalation 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 and constalation plotting
  • FFT size: Selects the size of the FFT for frequency domain plotting
• Options
  • Show grid: Shows or hides the grid in the plot window
  • Auto scale: When enabled the visible area will automatically be re-scaled to fit the entire plot

Clicking on the “Capture” button will start sampling with the currently selected settings. To stop sampling click the “Capture” button again. Setting changes will only be applied when a new capture session is started (With the exception of the “Show grid” option). It is not possible to switch between plotting modes or change the number of samples or FFT size while a capture session is active.

• ADC settings
  • Sampling frequency: Sets the sampling frequency of the ADC.
  • Offset calibration: Allows to calibrate each channels offset
  • Scale calibration: Allows to calibrate each channels full-scale value
• Gain amplifier settings: Allows to interdependently set gain on the I and Q channels. The gain can be configured from 4.5 dB to 20.5 dB
• LO settings: Configures the RX PLL
  • Frequency: Sets the receive base frequency.
  • Spacing: Selects the frequency spacing.

Clicking the “Save” button will write changes which have been made to the RX settings to the hardware.

• DDS settings
  • Enable: Enables or disables the two tone generator
    • Frequency: Allows to select the frequency for each of the two DDS tones.
    • Scale: Allows to select the scale for each of the two DDS tones. The output signal will be scaled according to this value.
• DAC settings
  • Offset calibration: Allows to calibrate each channels offset
  • Scale calibration: Allows to calibrate each channels full-scale value
  • Phase calibration: Allows to calibrate each channels phase
• LO settings: Configures the TX PLL
  • Frequency: Sets the transmit base frequency. The DDS signal will be modulated on top of this frequency. The valid range is from 400MHz to 4GHz.
  • Spacing: Selects the frequency spacing.

Clicking the “Save” button will write changes which have been made to the TX settings to the hardware.

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