CCS/TMS320F28335: GPIO data writing problem-Reg

bala naga lingaiah

Part Number: TMS320F28335
Other Parts Discussed in Thread: C2000WARE

Tool/software: Code Composer Studio

Dear Sir,

I tried to write the GPIO data registers using variables as code attached. But the data registers are not getting updated. I tried to debug at swap=1 or 0, all the variables such as swan,swbp and swbn are updating but not the data registers of the GPIO. Please, somebody, suggest how to resolve this problem.

int swap,swan,swbp,swbn;
void Gpio_setup1(void){
    EALLOW;
    
    GpioCtrlRegs.GPAMUX1.bit.GPIO11=0;
    GpioCtrlRegs.GPADIR.bit.GPIO11=1;
    GpioDataRegs.GPADAT.bit.GPIO11=0;

    GpioCtrlRegs.GPAMUX1.bit.GPIO12=0;
    GpioCtrlRegs.GPADIR.bit.GPIO12=1;
    GpioDataRegs.GPADAT.bit.GPIO12=0;

    GpioCtrlRegs.GPAMUX1.bit.GPIO13=0;
    GpioCtrlRegs.GPADIR.bit.GPIO13=1;
    GpioDataRegs.GPADAT.bit.GPIO13=0;

    GpioCtrlRegs.GPAMUX1.bit.GPIO14=0;
    GpioCtrlRegs.GPADIR.bit.GPIO14=1;
    GpioDataRegs.GPADAT.bit.GPIO14=0;

    EDIS;
}

__interrupt void cpu_timer0_isr(void)
{
    CpuTimer0.InterruptCount++;
   
    if (igact>(eps+0.1f)){
        swap=1;
    }

    else if(igact<(eps-0.1f)){
        swap=0;
    }
    if (swap==1){
        swan=0;swbn=1;swbp=0;
    }
    else{
        swan=1;swbn=0;swbp=1;
    }
    GpioDataRegs.GPADAT.bit.GPIO11=swap;
    GpioDataRegs.GPADAT.bit.GPIO12=swan;
    GpioDataRegs.GPADAT.bit.GPIO13=swbp;
    GpioDataRegs.GPADAT.bit.GPIO14=swbn;

    PieCtrlRegs.PIEACK.all = PIEACK_GROUP1;
}

over 6 years ago

0 Whitney Dewey over 6 years ago

TI__Guru 54465 points

How are you testing it? You've put a breakpoint in the cpu_timer0_isr and single stepped through the writes to GPADAT?

If you just write a constant 0 or 1 to GPADAT instead of swap, swan, etc...do you see the register getting updated?

Whitney

0 bala naga lingaiah over 6 years ago in reply to Whitney Dewey

Intellectual 570 points

No, The GPIO 11 and 13 registers are not getting updated

0 bala naga lingaiah over 6 years ago in reply to Whitney Dewey

Intellectual 570 points

Dear Sir,

I kept breakpoint at line no 36 and 46. At line 36 all the values are assigned properly but the lines 41-44 are not executing as desired.

0 Whitney Dewey over 6 years ago in reply to bala naga lingaiah

TI__Guru 54465 points

What about the GpioCtrl registers? Can you confirm that they contain what you wrote to them in Gpio_setup1()?

If you check the level on the pins, do they match what is shown in GPADAT?

Whitney

0 bala naga lingaiah over 6 years ago in reply to Whitney Dewey

Intellectual 570 points

No, Sir,.For GPIO 11 and 13 I am not able to assign the values using the variables. I changed these pins to GPIO16 and 18 then it is working fine. But I would like to know why it is happening.

0 Whitney Dewey over 6 years ago in reply to bala naga lingaiah

TI__Guru 54465 points

What hardware are you using? Do you have a controlCARD or a custom board? I'm not having any trouble toggling 11 and 13 on my own controlCARD.

Can you show me your GpioCtrlRegs configuration for these GPIOs in the CCS Registers window?

Whitney

0 bala naga lingaiah over 6 years ago in reply to Whitney Dewey

Intellectual 570 points

These are the control register configurations I used. 
void Gpio_setup1(void){ 
    EALLOW; 
     
    GpioCtrlRegs.GPAMUX1.bit.GPIO11=0; 
    GpioCtrlRegs.GPADIR.bit.GPIO11=1; 
    GpioDataRegs.GPADAT.bit.GPIO11=0; 
    GpioCtrlRegs.GPAMUX1.bit.GPIO12=0; 
    GpioCtrlRegs.GPADIR.bit.GPIO12=1; 
    GpioDataRegs.GPADAT.bit.GPIO12=0; 
    GpioCtrlRegs.GPAMUX1.bit.GPIO13=0; 
    GpioCtrlRegs.GPADIR.bit.GPIO13=1; 
    GpioDataRegs.GPADAT.bit.GPIO13=0; 
    GpioCtrlRegs.GPAMUX1.bit.GPIO14=0; 
    GpioCtrlRegs.GPADIR.bit.GPIO14=1; 
    GpioDataRegs.GPADAT.bit.GPIO14=0; 
    EDIS; 
} 
 

0 Whitney Dewey over 6 years ago in reply to bala naga lingaiah

TI__Guru 54465 points

The code looks fine. Can you confirm that the CCS registers window (when debugging go to View->Registers and find GpioCtrlRegs) shows the same values.

Also, can you tell me what hardware you're using? controlCARD or some other board?

Whitney

0 bala naga lingaiah over 6 years ago in reply to Whitney Dewey

Intellectual 570 points

The GPIO data registers are fine in watch expression window. If I tried to change the variables these are not updating in data registers except the odd even numbered gpios.

I am using TMSDOCK experimenter kit using control card F28335.

0 Whitney Dewey over 6 years ago in reply to bala naga lingaiah

TI__Guru 54465 points

Is it just this application that has this issue or do you see it in others? Like if you ran our gpio_toggle example from C2000Ware, do you see the same behavior?

Whitney

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CCS/TMS320F28335: GPIO data writing problem-Reg