CCS/TMS320F28379D: Sine Wave Generation & its comparison with Epwm

I don't want to generate Sine Wave from ePWM, I am generating Sine wave using SIN function of Math.h Library

I just want to compare that generated sine wave to ePWM module.

My Sine wave is of 50 Hz & ePWM TBPRD is set to have 2kHZ, So I want to compare them & generate pulses.


----------------CODE-------------------

#include <math.h>
#define PI 3.14159265359
int i;
float j;
float value[360];

for ( i=1; i<360; i++)
{
j = 2*PI*i;
value[i]= sin (j);
}
-------------------------------------------------
After writing this, I have configured EPwm1 Reg & its CMPA is set by following line:
*EPwm1Regs.CMPA.bit.CMPA = value[i];*

Please suggest me, if there is any mistake & provide solution to this issue

Your issue is likely because you are writing a 32-bit floating point variable into a register which expects a 16-bit fixed point value.

Firstly, since you have assigned value[] as float you need to be using sinf(), not sin(). Then in the line which writes the result to the register make sure you cast it to uint16_t first:
EPwm1Regs.CMPA.bit.CMPA = (uint16_t) value[i];

An even better way would be to declare value as uint16_t and typecast when you load it: that way you don't have to do it when you write to the register.

I have not tested your code so I don't know if it works, but intuitively I would expect you to have to offset value[] to avoid negative numbers. You should also ensure the TBPRD is set up so the range of what you're writing into CMPA makes sense.

I hope this helps.

Regards,

Richard