How to change a parameter while the signal is running?

Hello everyone,

I want to generate a signal that can be changed while running. I want to be able to change the magnitude while the signal is running. I tried generating a signal in background and i wrote different values for the magnitude in the command box but it didn't change anything.

I have the following code:-

%-------------------------------------

clearvars

clc

d = daqlist("ni");

deviceInfo = d{1, "DeviceInfo"};

dq = daq("ni");

fidData = fopen("logData.bin","w");

fidTime = fopen("logTime.bin","w");

DisplayTime=1;

s = daq.createSession('ni');

s.Rate=5000;

addAnalogInputChannel(s,'Dev2','ai11','Voltage');

lh = addlistener(s,'DataAvailable',@plotData);

lh1 = addlistener(s,'DataAvailable',@(src, event)logData(src, event, fidData,fidTime));

s.IsContinuous=true;

s.NotifyWhenDataAvailableExceeds=floor(DisplayTime*s.Rate);

%Output

addAnalogOutputChannel(s,'Dev2','ao0','Voltage');

Fs=s.Rate

t1=100;

t = 0 :1/Fs : t1-1/Fs;

A=0.5;

data0 = A*sin(2*pi*t*159.2)';

b=repmat(data0,5,1);

queueOutputData(s,b);

datagiver = addlistener(s, 'DataRequired',@(src,event)...

src.queueOutputData(b));

figure(1)

clf

startBackground(s);

%%

s.stop

fclose(fidData);

fclose(fidTime);

%-------------------------------------

Please help if you have an idea. I need to do this because im making a controller for the magnitude value.

Regards

Ali