F28M35H52C: Concerto F28M35H52C control cards some GPIO's are not working properly.

sandeep chavan

Part Number: F28M35H52C

Hello,

On concerto control card i am using some of the GPIO as output and trying to toggle them in 1 sec timer interrupt for testing purpose.

int count=0;
__interrupt void cpu_timer0_isr(void)

{

PieCtrlRegs.PIEACK.all = PIEACK_GROUP1;

count++;
if(count==1)
{

// GPIO high

GpioG1DataRegs.GPADAT.bit.GPIO23 =1;

GpioG1DataRegs.GPADAT.bit.GPIO25 =1;

GpioG1DataRegs.GPBDAT.bit.GPIO42 =1;

GpioG1DataRegs.GPBDAT.bit.GPIO45 =1;

GpioG1DataRegs.GPBDAT.bit.GPIO46 =1;

}

else if(count == 2)

{

// GPIO Low

GpioG1DataRegs.GPADAT.bit.GPIO23 =0;

GpioG1DataRegs.GPADAT.bit.GPIO25 =0;

GpioG1DataRegs.GPBDAT.bit.GPIO42 =0;

GpioG1DataRegs.GPBDAT.bit.GPIO45 =0;

GpioG1DataRegs.GPBDAT.bit.GPIO46 =0;

count =0;

}

for all above GPIO, i have done configuration of DIR and Mux registers properly. But still GPIO's are not getting toggled.

Also i used one more method for toggling GPIO, that is as below

int count=0;
__interrupt void cpu_timer0_isr(void)

{

PieCtrlRegs.PIEACK.all = PIEACK_GROUP1;

GpioG1DataRegs.GPATOGGLE.bit.GPIO23 =1;

GpioG1DataRegs.GPATOGGLE.bit.GPIO25 =1;

GpioG1DataRegs.GPBTOGGLE.bit.GPIO42 =1;

GpioG1DataRegs.GPBTOGGLE.bit.GPIO45 =1;

GpioG1DataRegs.GPBTOGGLE.bit.GPIO46 =1;

}

In this method, GPIO23 and GPIO25 are getting toggled. but others not. Also i observed while debugging that, on register level these bits are not getting toggle.

Please help me in this.

Regards,

Sandeep

over 7 years ago

0 Brett Larimore over 7 years ago

TI__Guru 57255 points

Hi Sandeep,

The following describes why the writes to your DAT registers are not behaving as you'd expect:
http://processors.wiki.ti.com/index.php/General_Purpose_IO_(GPIO)_FAQ_for_C2000#Q:_Back-to-back_DAT_register_writes_do_not_work_as_expected

===

Please note that the GPIOs you're having challenges with (GPIO42, 45, 46) have USB functionality. As a result, you may need to disable USB on these pins using the AMSEL bits. Refer to the GPIO section of the F28M35x TRM for more details.

===

Hopefully this helps!

Thank you,
Brett

0 sandeep chavan over 7 years ago in reply to Brett Larimore

Intellectual 470 points

Hi Brett,

As suggested, i have modified code. i used SET and CLEAR for toggling GPIO. and its working fine without any delay.

Also i made below change in Cortex M3 firmware,

GPIOPadConfigSet(GPIO_PORTG_BASE, 0xEF, GPIO_PIN_TYPE_STD_WPU);

After making this change GPIO42,45 and 46 are getting toggled from C2x core.

Please let me know is it right way?

Regards,

Sandeep

0 Brett Larimore over 7 years ago in reply to sandeep chavan

TI__Guru 57255 points

Hi Sandeep,

Yes, I believe you've got things right.

GPIOPadConfigSet configures the AMSEL bits which resolves the issue you were seeing with GPIO42,45 & 46.

Thank you,
Brett

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F28M35H52C: Concerto F28M35H52C control cards some GPIO's are not working properly.