EALLOW and EDIS for GpioCtrlRegs

Prakash Kumar Thulasi Kumar

Expert 2015 points

Other Parts Discussed in Thread: CONTROLSUITE

Hi Guys,

CCS v 6.1.3.0034 (compiler version = TI v15.12.1.LTS)

TMX320F28075 Control Card

control Suite v 3.4.0

Program : controlSUITE\device_support\F2807x\v200\F2807x_examples_Cpu1\epwm_trip_zone

Accordind to the Technical Reference Manual The GPAPUD is EALLOW protected.

Then in the following function from the above mentioned example program, why is there no EALLOW and EDIS for the GPAPUD ??

void InitTzGpio(void)
{
    //
    // For External Trigger, GPIO12 as the trigger for TripZone
    //
    GpioCtrlRegs.GPAPUD.bit.GPIO12 = 0;    // Enable pull-up on GPIO12 (TZ1)

    GpioCtrlRegs.GPAQSEL1.bit.GPIO12 = 3;  // Asynch input GPIO12 (TZ1)

    EALLOW;
    InputXbarRegs.INPUT1SELECT = 12;
    EDIS;

Also if I add EALLOW and EDIS then the trip zone interrupt doesn't work. Why so?

Thanks in advance.

over 9 years ago

0 Vivek Singh over 9 years ago

TI__Guru** 115881 points

Hi Prakash,

Yes, those registers are EALLOW protected so there may be a mistake in the code (we need to check).

Also if I add EALLOW and EDIS then the trip zone interrupt doesn't work. Why so?

Once pull is enable, the pin will be high. If the interrupt is generated on rising edge then it'll not work. Have you check the polarity of the signal for interrupt?

Regards,

Vivek Singh

0 Prakash Kumar Thulasi Kumar over 9 years ago in reply to Vivek Singh

Expert 2015 points

Hi Vivek,

The interrupt is generated on falling edge. The GPIO12 is normally HIGH(connected to 3.3V). A interrupt occurs when it is pulled down to ground.

0 Vivek Singh over 9 years ago in reply to Prakash Kumar Thulasi Kumar

TI__Guru** 115881 points

Hi Prakash,

Sorry, look like this post was not answered for quite some time. I did try this example and do not see any issue after using EALLOW for pull enable register. Interrupt happens when even I pull GPIO 12 low. Please note that on EPWM1 only one interrupt will happen and EPWM2 will have continuous as long as GPIO12 is driven low.

Regards,
Vivek Singh

0 Prakash Kumar Thulasi Kumar over 9 years ago in reply to Vivek Singh

Expert 2015 points

HI Vivek,
I wrote a new program and it worked(with and without EÁLLOW) . I don't use EALLOW now, still it works.
Accordind to the Technical Reference Manual the GPAPUD is EALLOW protected. Then how can it work without EALLOW keyword?

0 Vivek Singh over 9 years ago in reply to Prakash Kumar Thulasi Kumar

TI__Guru** 115881 points

Prakash,

EALLOW is missing for pull enable code only which may not impact the usecase for this test. Without pull enable pin will Hi-Z and from Hi-Z to '0' can be considered as falling edge. Agree?

Regards,

Vivek Singh

0 Prakash Kumar Thulasi Kumar over 9 years ago in reply to Vivek Singh

Expert 2015 points

OK. Thanks Vivek :)

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EALLOW and EDIS for GpioCtrlRegs