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TMS320F28035: When is the CNTL_2P2Z called in HVPSFB_PCMC ?

Brian Wang0
Expert 5540 points

Part Number: TMS320F28035

Hi team,

I am working with my customer to achieve a peak current mode control on their F28032 platform. So your work HVPSFB_PCMC is a great referrence to us.

So far, we are able to achieve most of functions and the converter can work under a light load. However, we still do not fully understand how the code works.

In the control loop, we used CNTL_2P2Z in the DPL lib as the voltage loop controller. Pointers are used to link the CNTL_2P2Z variables with the converter vairables.

eg:

// 2P2Z connections for the outer Voltage Loop
CNTL_2P2Z_Ref1 = &VfbSetSlewed; // Slewed Voltage command
CNTL_2P2Z_Out1 = &Iref; // Reference command to the current loop
CNTL_2P2Z_Fdbk1 = &Avg_Vout; // Avg. FB O/P Voltage feedback
CNTL_2P2Z_Coef1 = &CNTL_2P2Z_CoefStruct1.b2; // point to first coeff.

But my question is: After linking the variables, how is the 2P2Z compensator called and the calculation is executed? I did not see any operations doing this.

Thanks for your help!

  • 0
    TI__Guru* 85220 points

    Weiqi,

    The compesator is called when the EPWM1 triggers its ISR based on the settings at line 563 in the HVPSFB-Main.c

            EALLOW;
	PieVectTable.EPWM1_INT = &DPL_ISR;			// Map Interrupt
	EDIS;																					
	PieCtrlRegs.PIEIER3.bit.INTx1 = 1;			// PIE level enable, Grp3 / Int1
	EPwm1Regs.ETSEL.bit.INTSEL = ET_CTRU_CMPA;	// INT on CMPA event
	EPwm1Regs.ETSEL.bit.INTEN = 1;				// Enable INT
	EPwm1Regs.ETPS.bit.INTPRD = ET_1ST;			// Generate INT every event

    The function DPL_ISR is in the HVPSFB-DPL-ISR.asm file.  Since this is part of the ISR, that is why you don't see an explicit function call in the source code.

    Please let me know if you need more information on this issue.

    Best,

    Matthew

  • 0 in reply to MatthewPate
    TI__Expert 5540 points
    Hi Matthew,

    Glad to meet via E2E.
    Yes, we generally understand how the code works. And I know they DPL_ISR is triggered by EPWM1.
    However, in DPL_ISR, I can only see code related to EPWM actions which is prepared for next DPL_ISR trigger and switch PWM toggle. But I cannot see any code called the controller.

    In this .asm, you did included the CNTL_2P2Z.asm. Dose this mean the CNTL_2P2Z.asm will be executed in the ISR?

    Regards,
    Brian
  • 0 in reply to Brian Wang0
    TI__Guru* 85220 points

    Weiqi,

    Yes, the last statement you have is correct; the call to the CNTL_2P2Z assembly macro is at line 544 in the HVPSFB-DPL-ISR.asm copied here:

    .if(INCR_BUILD = 2)
		.ref	_No_2p2z
		MOVW	DP, #(_No_2p2z)
		MOV		AL, @(_No_2p2z)		
		CMPB 	AL,#0x1				
		B		EXIT_ISR, EQ			; If equal - coefficients are being changed --> don't execute 2P2Z

		CNTL_2P2Z	 		1			; PSFB Voltage Controller 
	.endif

    The .if is a compile time directive, so this section will only be part of the final code if we are at the stage 2 build.  

    Best,

    Matthew

  • 0 in reply to MatthewPate
    TI__Expert 5540 points
    Hi Matthew,

    This really solved my questions.
    Thanks for your reply!

    Brian