TMS320F28335: Closed Loop Control of an Inverter by using TMS320F28335 an matlab 2016a

Gaurav,

You are correct, the input signal to the ADC needs to be between 0 - 3 V.  For signed magnitude signal between -1 V and +1 V you will need to add 1 V to the analog input and then subtract 1 V from the digital result.  Please see the following slide from the F28x7x workshop (similar for the F2833x):

For the F28335, the code would be:

#include “DSP2833x_Device.h”

#define offset 0x07FF

void main(void)

{

   int16 value;                                       // signed

   value = AdcMirror.ADCRESULT0 – offset;

}

I hope this helps. If this answers your question, please click the green "Verified Answer" button. Thanks.

- Ken

Gaurav,

I think you need external signal conditioning (DC voltage adder) to convert -1/ +1 V to 0-3V, so the C2000 device can read in the signal. Then inside of Simulink, you can software scale it back to -1 / +1 as needed (several ways to do this, subtract a DC offset, or use a 1D-lookup table, etc).

Cheers,

-Brian