TMS320F280041C: Calculating total DC motor current

No, you have to add a current sensor to sample the dc bus current. 

Then, How does the function below computes motor power without knowing motor current?

//! \brief Computes the power in Watts (W)
//! \param[in] handle The estimator (EST) handle
//! \return The power value, W
extern float32_t EST_computePower_W(EST_Handle handle);

Can I just divide power by bus voltage to get current?

Alex

Will this do the job?

motorVars.Is_A = sqrt((Idq_in_A.value[0] * Idq_in_A.value[0]) +
(Idq_in_A.value[1] * Idq_in_A.value[1]));

Alex

float32_t EST_computePower_W(EST_Handle handle) probably calculates mechanical power from torque & speed estimates.

And

motorVars.Is_A = sqrt((Idq_in_A.value[0] * Idq_in_A.value[0]) + (Idq_in_A.value[1] * Idq_in_A.value[1]));

won't calculate input DC current. You need to take output modulation + "3-phase" into account. For example I_motor=10A at 10% PWM (10% DC Voltage Bus utilization) will result in 1-1.2A DC Current, i don't know the exact formula.