TMS320F28069M: modification for two current sensors in lab11e

Dear TI members,

I am developing custom board of BLDC driver with hall sensor

I think lab11e of motorware is good example for my application, and use it as reference code.

looking into lab11e code, I have found it required 3 current sensor at following code at HALLBLDC_Ctrl_Run()

		if(gHall_Flag_EnableBldc)
		{
			angle_pu = angle_est_pu;
			speed_pu = gHall_speed_fdb_pu;

			if(gHall_Flag_CurrentCtrl == true)		// Torque Control Mode
			{
				gHall_BLDC_Is_fdb_pu = gAdcData.I.value[gHall_BLDC_Flag_Is_fdb];
				gHall_BLDC_Is_ref_pu = speed_pid_out;

				// BLDC current loop
				PID_run(pidHandle[3],gHall_BLDC_Is_ref_pu,gHall_BLDC_Is_fdb_pu,&gHall_PwmDuty);

				HALLBLDC_Ctrl_PwmSet(gHall_PwmState, gHall_PwmDuty);
			}
			else									// Speed Control Mode
			{
				gHall_PwmDuty = speed_pid_out;
				HALLBLDC_Ctrl_PwmSet(gHall_PwmState, gHall_PwmDuty);
			}
		}
		else

As I have checked, gHall_BLDC_Flag_Is_fdb have 3 values, 0 or 1 or 2.

so gAdcData.I.value[gHall_BLDC_Flag_Is_fdb] should have sensored value for 3 currents.

but, my custom board has only 2 current sensor. phase A and C.

Would you please let me know how to modify code for this ?

Is it OK to set USER_NUM_CURRENT_SENSORS to be 3 in user.h,

and set third value to be Ia + Ib + Ic = 0 ?

please let me know your idea.

Thanks in advance.

Best Regards,

Hae Ryong