LimeSDR program in Matlab

Hey guys, thanks in advance.

I am developing a SAR passive radar in Matlab with LimeSDR. I am using jocover and RakhDamir programs to connect LimeSDR to matlab.

The code I present you, let me receive Fs*Ts samples and then when LimeSDR gets that samples it stops receiving. However, I want to receive samples continually, until I presss a button on the keypad to stop receiving on LimeSDR , and then save all the samples in a file to save in my computer. How can I do that, maybe with a while loop?

% Start the module
dev.start();
fprintf('Start of LimeSDR\n');


% Receive samples on RX0 channel
indRx = 1;
[samples, ~, samplesLength]             = dev.receive(Fs*Ts,0);
bufferRx(indRx:indRx+samplesLength-1)   = samples;


% Receive samples on RX1 channel
indRx1 = 1;  % index of the last received sample

[samples1, ~, samplesLength1]             = dev.receive(Fs*Ts,1);
bufferRx1(indRx1:indRx1+samplesLength1-1)   = samples1;

pause(1)

% Cleanup and shutdown by stopping the RX stream and having MATLAB delete the handle object.
dev.stop();
clear dev;
fprintf('Stop of LimeSDR\n');

Answer 1

[Ben Cunningham]

The following code will give you a while loop which can be stopped by clicking on the pop-up figure. It makes use of a global variable and a quick and dirty dialogue with a callback. Consider consulting the documentation for dialogs to make an optimised design.

global gStop % Global variable to stop while loop

gStop = false;

% Create a dialogue which when clicked calls the 'stopStream' function
stopBtn = dialog('Name', 'Click to Stop', "ButtonDownFcn",@stopStream);
drawnow

% Create while loop which runs until global gStop is true
while ~gStop
    % Receive from SDR
    
    drawnow % Gives dialog a chance to call stopStream and set the global variable    
end

close(stopBtn) % Close once stopped

function stopStream(~,~,~)
% Sets global gStop to true
global gStop
gStop = true; 
end

For saving to file consider using the matlab save function like:

save capturedDataFile.mat myData

For large quantities of data, and perhaps to write to a single file each while loop iteration consider using the baseband file writer.