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TMS320F28055: Interrupts are not always triggered when it supposed to

Qiang Guo
Expert 1695 points
Part Number: TMS320F28055

Hi TI members,

  I am sending in same command to trigger my interrupts ISR. But my interrupts ISR is not always triggered.

I have to send 3-4 times until my interrupts ISR is able to capture.

I want my interrupt ISR be able to capture the falling edge every time I send in the command. 

How can I do so? What can cause my problem? Please help, thank you!

  • 0
    Expert 1695 points

    Here is my setting for my interrupts:

       EALLOW;	
   PieVectTable.XINT3 = &xint3CS_isr; 
   EDIS;
  
   EALLOW;
   PieCtrlRegs.PIEIER12.bit.INTx1 = 1;         // Enable PIE Group 12 INT1
   IER |= M_INT12;                            // Enable CPU INT12
   EINT;        


  EALLOW;

   //GPIO10 is input XINT3 - CS
   GpioCtrlRegs.GPAPUD.bit.GPIO10 = 0;        // Enable pullup on GPIO10
   GpioCtrlRegs.GPAMUX1.bit.GPIO10 = 0;       // GPIO10
   GpioCtrlRegs.GPAQSEL1.bit.GPIO10 = 3; 	  // asynch input

   EDIS;

// GPIO10 is XINT3
   EALLOW;
   GpioIntRegs.GPIOXINT3SEL.bit.GPIOSEL = 10;  // XINT3 is GPIO10
   EDIS;

// Configure XINT3
   XIntruptRegs.XINT3CR.bit.POLARITY = 0;      // Falling edge interrupt

// Enable XINT3
   XIntruptRegs.XINT3CR.bit.ENABLE = 1;        // Enable XINT3

interrupt void xint3CS_isr(void)
{
	Xint3CS_Count++;
	PieCtrlRegs.PIEACK.all = PIEACK_GROUP12;
}

  • 0 in reply to Qiang Guo
    TI__Guru** 115251 points

    Hi Qiang,

    Have you measured the pulse width of the GPIO signal you are driving from outside. Is this same all the time (in working and non working case)?

    Regards,

    Vivek Singh

  • 0 in reply to Vivek Singh
    Expert 1695 points
    From the oscilloscope diagram, it has the same pulse width every time when it received
  • 0 in reply to Vivek Singh
    Expert 1695 points
    Hi Vivek,
    Problem solved, something wrong with my external signal source. Thanks for your help!