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Original question:

Inverted external interrupts issue

TMS320F28027: LED blink with button, not working

B Krishnan Iyer
Prodigy 70 points

Part Number: TMS320F28027

I am trying to blink LED with every press of button. I have attempted to write the code but I am missing something somewhere. Please help me figure out.

#include "DSP28x_Project.h"

interrupt void xint1_isr();

void main()
{
	InitSysCtrl();

	/*Interrupt config*/

	DINT;
	InitPieCtrl();

	IER = 0x0000;
	IFR = 0x0000;

	InitPieVectTable();

	EALLOW;

	PieVectTable.XINT1 = &xint1_isr;

	PieCtrlRegs.PIECTRL.bit.ENPIE =1;
	PieCtrlRegs.PIEIER1.bit.INTx4 = 1;
	PieCtrlRegs.PIECTRL.bit.PIEVECT= 0x0D46;
	IER |= M_INT1;
	EINT;

	/*Input GPIO*/

	//GpioCtrlRegs.GPAMUX1.bit.GPIO12 = 0;
	GpioCtrlRegs.GPADIR.bit.GPIO12 = 0;
	GpioCtrlRegs.GPAQSEL1.bit.GPIO12 = 0;

	GpioIntRegs.GPIOXINT1SEL.bit.GPIOSEL =12;
	XIntruptRegs.XINT1CR.bit.POLARITY = 0;
	XIntruptRegs.XINT1CR.bit.ENABLE =1;

/* LED Blink*/
//	GpioCtrlRegs.GPAMUX1.bit.GPIO0 = 0;
	GpioCtrlRegs.GPADIR.bit.GPIO0 = 1;
	while(1);
}

interrupt void xint1_isr()
{
	GpioDataRegs.GPATOGGLE.bit.GPIO0 = 1;
	PieCtrlRegs.PIEACK.all = PIEACK_GROUP1;
}

  • 0
    Prodigy 70 points

    Sorry guys  I have fixed the program.

    Here is the code,

    #include "DSP28x_Project.h"

interrupt void xint1_isr();

void main()
{
	InitSysCtrl();

	/*Interrupt config*/

	DINT;
	InitPieCtrl();

	IER = 0x0000;
	IFR = 0x0000;

	InitPieVectTable();

	EALLOW;

	PieVectTable.XINT1 = &xint1_isr;

	PieCtrlRegs.PIECTRL.bit.ENPIE =1;
	PieCtrlRegs.PIEIER1.bit.INTx4 = 1;
	PieCtrlRegs.PIECTRL.bit.PIEVECT= 0x0D46;
	IER |= M_INT1;
	EINT;
	ERTM;

	/*Input GPIO*/

	GpioCtrlRegs.GPAMUX1.bit.GPIO12=0;
	GpioCtrlRegs.GPAQSEL1.bit.GPIO12=0;
	GpioCtrlRegs.GPADIR.bit.GPIO12 = 0;
	GpioCtrlRegs.GPAPUD.bit.GPIO12 = 1;

	GpioIntRegs.GPIOXINT1SEL.bit.GPIOSEL = 12;
	XIntruptRegs.XINT1CR.bit.POLARITY = 0;
	XIntruptRegs.XINT1CR.bit.ENABLE =1;
	GpioIntRegs.GPIOLPMSEL.bit.GPIO12 = 1;

	/* LED Blink*/
	GpioCtrlRegs.GPADIR.bit.GPIO0 = 1;
	while(1);
}

interrupt void xint1_isr()
{
	GpioDataRegs.GPATOGGLE.bit.GPIO0 = 1;
	PieCtrlRegs.PIEACK.all = PIEACK_GROUP1;
}

  • 0 in reply to B Krishnan Iyer
    TI__Guru 57255 points

    Thank you for posting your resolution to the issue.  Good luck in your project!

    -Brett