Viewing IQ Math variables in Scope of Matlab Simulink

Hi,

I am trying to observe the ADC result of 28027 in scope of Matlab-Simulink. The output of the ADC is coming in integer format. But I would like to see it in real word value . .ie say if output is 4096 it should show value of 3.0 in the scope of Matlab Simulink. I have used data conversion block of Matlab Simulink with setting of output data type as fixdt(1, 32, 19). However, the values seen are the integer type.

Answer 1

[Venkatesh Chilapur]

Hi Sachin,

Please find the attached model which is created in 2019a version of MATLAB.

We have used fixdt(1, 32, 19) data type for the math.

Please let us know if this helps.

Regards,

Venkatesh C

[SACHIN DEVASSY]

Hi Venkatesh,

Thanks for the reply. Could you save this in 2018a version and post it. I dont have 2019a Matlab.

Regads,

Sachin

[Venkatesh Chilapur]

Here you go!

[SACHIN DEVASSY]

Thankyou Venkatesh. Its working.

Is the computational budern same or reduced if we use TI IQ math libraries for multiplication (_IQmpy) and division (_IQdiv) instead of direct multiplication and division (all the numbers being in fixdt(1,32,19).

[Venkatesh Chilapur]

Hi Sachin,

Yes, the IQ Math libraries are optimized to be computational efficeint for fixed point data type.

You can enable the CRL for the same by setting the same TI C28x or TI C28x (ISO) CRL under Code Generation -> Interface Tab.

HTH,

Regards,

Venkatesh C