TMS320F28379D: GPIO83 is not

Hello Rajesh,

Can you show me the code you use to configure this pin? Also, what type of F28379D board are you using, is it a LaunchPAD, ControlCARD, or something custom?

Best regards,

Omer Amir

Hello Amir,

The board is a customized one and it has got bunch of relays, LEDs and external ADC etc.. COming to the problem, one of the GPIOs i.e 83 is connected to a relay through a relay driverand we don't see any change in the GPIO83 data registers on CCS and also at the GPIO physical pin too.

Here is the code

#include "F28x_Project.h"

interrupt void timer_ovf_isr(void);
void TimerInit();
void PwmInit();


int i=0;
void main(void)
{

    InitSysCtrl();
    InitGpio();
    TimerInit();
    PwmInit();

    EALLOW;
    GpioCtrlRegs.GPAMUX1.all = 0;
    GpioCtrlRegs.GPAMUX2.all = 0;
    GpioCtrlRegs.GPBMUX1.all = 0;
    GpioCtrlRegs.GPBMUX2.all = 0;
    GpioCtrlRegs.GPCMUX1.all = 0;
    GpioCtrlRegs.GPCMUX2.all = 0;
    GpioCtrlRegs.GPDMUX1.all = 0;
    GpioCtrlRegs.GPDMUX2.all = 0;
    GpioCtrlRegs.GPAGMUX1.bit.GPIO0 = 1;
    GpioCtrlRegs.GPAGMUX1.bit.GPIO1 = 1;

    GpioCtrlRegs.GPADIR.bit.GPIO24 = 1; //led
    GpioCtrlRegs.GPCDIR.bit.GPIO73 = 1; //led
    GpioCtrlRegs.GPCDIR.bit.GPIO74 = 1; //led
    GpioCtrlRegs.GPCDIR.bit.GPIO92 = 1; //led
    GpioCtrlRegs.GPCDIR.bit.GPIO93 = 1; //led
    GpioCtrlRegs.GPCDIR.bit.GPIO79 = 1; //relay1
    GpioCtrlRegs.GPCDIR.bit.GPIO80 = 1; //relay2
    GpioCtrlRegs.GPCDIR.bit.GPIO81 = 1; //relay3
    GpioCtrlRegs.GPCDIR.bit.GPIO82 = 1; //relay4
    GpioCtrlRegs.GPCDIR.bit.GPIO83 = 1; //relay5
    EDIS;

    DINT;
    InitPieCtrl();
    InitPieVectTable();
    EALLOW;
    PieVectTable.TIMER0_INT = &timer_ovf_isr;

    EDIS;

    PieCtrlRegs.PIEIER1.bit.INTx7 = 1; //enable timer interrupt

    IER |= 0x0001;
    EINT;          // Enable Global interrupt INTM
    ERTM;          // Enable Global realtime interrupt DBGM

    CpuTimer0Regs.TCR.bit.TSS = 0;
    while(1)
    {

    }

}

void TimerInit(void)
{
	CpuTimer0Regs.PRD.bit.LSW = 0x002F;
	CpuTimer0Regs.PRD.bit.MSW = 0x002F;
	CpuTimer0Regs.TPR.bit.TDDR = 0x001F;
	CpuTimer0Regs.TCR.bit.TIE = 1;
	CpuTimer0Regs.TCR.bit.TRB = 0;
	CpuTimer0Regs.TCR.bit.TSS = 1;
	CpuTimer0Regs.TCR.bit.FREE = 0;
}



void timer_ovf_isr(void)

{

if (i>5)
 i = 0;

if(i==0)
        GpioDataRegs.GPCTOGGLE.bit.GPIO79 = 1; //realy 4
if(i==1)
     GpioDataRegs.GPCTOGGLE.bit.GPIO80 = 1; //relay 5
    if(i==2)
     GpioDataRegs.GPCTOGGLE.bit.GPIO81 = 1; //relay 6
        if(i==3)
   GpioDataRegs.GPCTOGGLE.bit.GPIO82 = 1; //relay 2
            if(i==4)

      GpioDataRegs.GPCTOGGLE.bit.GPIO83 = 1;


    
    i = i+1;


	CpuTimer0Regs.TCR.bit.TIF = 1;
	PieCtrlRegs.PIEACK.all = 0x0001;
}



void PwmInit(void)
{/*
	EPwm1Regs.TBCTL.all = 0;
	EPwm1Regs.TBPRD = 2000;
	EPwm1Regs.TBPHS.all = 0;

	EPwm1Regs.TBCTL.bit.PHSDIR = 1;
	EPwm1Regs.TBCTL.bit.CLKDIV = 0;
	EPwm1Regs.TBCTL.bit.HSPCLKDIV =1;
	EPwm1Regs.TBCTL.bit.PRDLD = 0;
	EPwm1Regs.TBCTL.bit.PHSEN = 0;
	EPwm1Regs.TBCTL.bit.CTRMODE = 2;
	EPwm1Regs.TBCTL2.bit.PRDLDSYNC = 0;
	EPwm1Regs.TBCTL2.bit.SYNCOSELX = 1;
	EPwm1Regs.AQCTLA.bit.CAD = 2;
	EPwm1Regs.AQCTLA.bit.CAU = 1;
	EPwm1Regs.AQCTLB.bit.CAD = 1;
	EPwm1Regs.AQCTLB.bit.CAU = 2;
	EPwm1Regs.CMPA.all = 1000;
*/

        EALLOW;
        EPwm1Regs.TBCTL.all = 0;
        EPwm1Regs.TBCTL.bit.CTRMODE = 2; //updown count
        EPwm1Regs.TBCTL.bit.PHSEN = 0; //master
        EPwm1Regs.TBCTL.bit.PRDLD = 0;
        EPwm1Regs.TBCTL.bit.SYNCOSEL = 1; //master
        EPwm1Regs.TBCTL.bit.HSPCLKDIV = 1;
        EPwm1Regs.TBCTL.bit.CLKDIV = 0;  // clock to pwm = 200MHz/HSPCLK x CLKDIV = 100MHz

        EPwm1Regs.TBPRD = 2500; //20KHz
        //CMPCTL1 and 2 initializaton

        //AQCTL

        EPwm1Regs.AQCTLA.bit.CAU = 2;
        EPwm1Regs.AQCTLA.bit.CAD = 1;
        EPwm1Regs.CMPA.bit.CMPA = 1750;
        //event selection
        EPwm1Regs.ETSEL.bit.INTSEL = 1; //ADC start @CTR = 0
        EPwm1Regs.ETSEL.bit.INTEN = 1; //enable epwm1 interrupt
        EDIS;
}

Regards,

Rajesh BN.

Hello Rajesh,

Your configuration seems fine (there is no initialization of the GPCGMUX2 for GPIO83, but the default value should be 0 if you want to double-check). Have you verified that when your program runs, it reaches the line of code where GPIO83 is toggled? Can you confirm that the GPIO configuration is what is expected at this line (GPCMUX2, GPCGMUX2, and GPCDIR registers)? It's better to test this with GPIO83 not connected to anything except a scope to see the signal.

Best regards,

Omer Amir