Problem setting up TZ1 for an over current

Brian Branecky1

Other Parts Discussed in Thread: TMS320F28069, CONTROLSUITE

I am trying to set GPIO12 as a TZ1 pin on a 64 pin 28035 and have it set the OSHT1 flag on a ePwm4 module, but even though the pin is going low the OSHT1 is never set.

I have this test code in the A/D interrupt:
if (GpioDataRegs.GPADAT.bit.GPIO12==0){
debug=EPwm4Regs.TZFLG.bit.OST;
PHASE_A_OFF;
PHASE_B_OFF;
PHASE_C_OFF; //break point after this
}

When the program breaks, the debug variable is zero, but if the pin is low (because I am in the if statement) then why isn't the flag set.

Here is the init code;
EPwm4Regs.TZSEL.bit.OSHT1 = 1; //use TZ1 to set TZ flag

GpioCtrlRegs.GPAMUX1.bit.GPIO12 = 1; //set IO to TZ1

Are there more registers that need to be initialized? What am I missing?

Thanks for your help.

over 11 years ago

0 ChrisClearman over 11 years ago

TI__Guru** 118760 points

make sure you configure these registers inside of

EALLOW;

// make secure register changes after EALLOW

EDIS;

the set-up of your ePWM Trip Zone is correct

EPwm4Regs.TZSEL.bit.OSHT1 = 1; //enable TZ1 for OSHT

for the action on the event we usualy do it like this

EPwm4Regs.TZCTL.bit.TZA = TZ_FORCE_LO; // EPWMxA will go low
EPwm4Regs.TZCTL.bit.TZB = TZ_FORCE_LO; // EPWMxB will go low

0 vladimir vladimir1 over 10 years ago

Intellectual 565 points

I have same problem with TMS320F28069
EALLOW;
GpioCtrlRegs.GPAPUD.bit.GPIO16=1; // disable pull-up on GPIO16(FO_OUT)
GpioCtrlRegs.GPAQSEL2.bit.GPIO16 = 3; // Asynch input GPIO16 (TZ2)
GpioCtrlRegs.GPAMUX2.bit.GPIO16 = 3; // Configure GPIO16 as TZ2

EPwm1Regs.TZSEL.bit.OSHT2 = 1; //TZ2
EPwm1Regs.TZCTL.bit.TZA = TZ_FORCE_LO;// What do when TZ2 occurs
EPwm1Regs.TZEINT.bit.OST = 1; // Enable TZ interrupt
EDIS;
when i simulated overcurrent, OSHT2 bit never set to 1. Physycaly GPIO16=0 (and durning debug i see GPIO16=0), but OSHT2 flag=0. How you solved this problem?

0 Brett Larimore over 10 years ago in reply to vladimir vladimir1

TI__Guru 57255 points

Hi,

Have you taken a look at the below example? I would recommend experimenting with it.
\controlSUITE\device_support\f2806x\v141\F2806x_examples_ccsv5\epwm_trip_zone\

I also have a few thoughts which may help you find your issue:
* There isn't specifically a OSHT2 flag. You'll have to look at TZFLG[OSHT] (which is the flag showing that a OSHT has occurred).
* Is the PWM clock enabled?

Thank you,
Brett

0 vladimir vladimir1 over 10 years ago in reply to Brett Larimore

Intellectual 565 points

The problem is that everything is working properly F28027. I have the feeling that this module F28069 all off. I used the other pins to check trip zone: in the debugger can be seen that at pin logic 0, but TZFLG[OSHT] flag is not set. Maybe something I have not included. Let us once again:

PieVectTable.EPWM1_TZINT = &epwm1_tzint_isr;

IER |= M_INT2; // Enable CPU Interupt 2
PieCtrlRegs.PIEIER2.bit.INTx1 = 1; // Enable INT 2.1 (EPWM1_TZINT) in the PIE

GpioCtrlRegs.GPAPUD.bit.GPIO16=1; // disable pull-up on GPIO16(FO_OUT)

GpioCtrlRegs.GPAQSEL2.bit.GPIO16 = 3; // Asynch input GPIO16 (TZ2)

GpioCtrlRegs.GPAMUX2.bit.GPIO16 = 3; // Configure GPIO16 as TZ2

EPwm1Regs.TZSEL.bit.OSHT2 = 1; //TZ2
EPwm1Regs.TZCTL.bit.TZA = TZ_FORCE_LO;// What do when TZ2 occurs
EPwm1Regs.TZEINT.bit.CBC = 1; // Enable TZ interrupt
EPwm_Config();	  //enable PWM module, some configs etc

In debug mode I checked the contents of the registers: write to them passes. Why processor see logic 0, but does not set the flag. Most likely I'm missing some bits.

0 vladimir vladimir1 over 10 years ago in reply to vladimir vladimir1

Intellectual 565 points

0 ChrisClearman over 10 years ago in reply to vladimir vladimir1

TI__Guru** 118760 points

are you sure GPIO16 is mapped correctly in HW and SW for the F2806x?

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Problem setting up TZ1 for an over current