• State
  • Locked Locked
  • Replies 4 replies
  • Subscribers 82 subscribers
  • Views 2551 views
  • Users 0 members are here
Support feedback
Options
Options
Related

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

EXTERNAL INTERRUPT on GPIO F28069

Andrea Rendine
Intellectual 580 points

Other Parts Discussed in Thread: CONTROLSUITE

Hi everyone,

my intent is to "read" the tachometer signal from a 12V fan by using external interrupts on GPIO-0.  I have some trouble to understand how does it works.

As first, my intent is just connect my GPIO-0 to a 3.3V signal and toggle a LED. Below ONLY the main steps that I do in my program:

  InitPieCtrl();

 InitPieVectTable();

EALLOW;

     GpioCtrlRegs.GPAMUX2.bit.GPIO31 = 0; //0-GPIO  LED
     GpioCtrlRegs.GPADIR.bit.GPIO31 = 1; //1-output

    GpioCtrlRegs.GPAMUX1.bit.GPIO0 = 0;         // GPIO
    GpioCtrlRegs.GPADIR.bit.GPIO0 = 0;          // input
    GpioIntRegs.GPIOXINT1SEL.bit.GPIOSEL = 0;   // Xint1 is GPIO 0
 EDIS;

    XIntruptRegs.XINT1CR.bit.POLARITY = 1;      // Rising edge interrupt
    XIntruptRegs.XINT1CR.bit.ENABLE = 1;        // Enable Xint1


Once done that, becouse I use DSP BIOS, I enable the PIE INT 1.4 (that correspond to the XINT1) with a function called "count" that is something like this:

Uint32 cont=0;
void count(void){
    GpioDataRegs.GPATOGGLE.bit.GPIO31 = 1;
    cont++;
}


Now the problem is that, even if I supply the GPIO.0 with 3.3V the LED do not toggle and nothing happen. Where am I doing wrong?

Hope for an answer,

Best,

Andrea

  • 0
    Guru 192875 points

    Hi Andrea,

    Andrea Rendine said:
    my intent is to "read" the tachometer signal from a 12V fan by using external interrupts on GPIO-0.  I have some trouble to understand how does it works.

    This can be very well achieved by eCAP peripheral instead of GPIO as External interrupts.

    Andrea Rendine said:
    Now the problem is that, even if I supply the GPIO.0 with 3.3V the LED do not toggle and nothing happen. Where am I doing wrong?

    How is your external interrupt configured? Interrupt on rising edge or falling edge? Please refer the example code:

    C:\ti\controlSUITE\device_support\f2806x\v151\F2806x_examples_ccsv5\external_interrupt

    Regards,

    Gautam

  • 0 in reply to Gautam Iyer
    Intellectual 580 points

    Hi Gautam,

    I've never used the eCAP peripheral and actually I don't know how I can implement it with the DSP BIOS interrupt.

    My signal is a PWM pulse (or just I can use a BUTTON to simulate a pulse, but again it doesn't work)  and I set the:    

        XIntruptRegs.XINT1CR.bit.POLARITY = 1;      // Rising edge interrupt
        XIntruptRegs.XINT1CR.bit.ENABLE = 1;        // Enable Xint1

    I think that do not work becouse I was wrong something on DSP BIOS.

    I have read on the datasheet of F28069 and I enabled HWI->PIE.INTERRUPTS->PIE_INT1.4 and set my function _count that simply "count" each time an interrupt comes, but the value is always 0 and I think that never happen the interrupt.

    Can you help me in someway about the code?

    Thanks,


    Andrea

  • 0 in reply to Andrea Rendine
    Guru 192875 points
    Andrea, is DSP bios your requirement? or its a pre-written code that you're modifying?
  • 0 in reply to Gautam Iyer
    Intellectual 580 points

    Gautam, 

    actually is a pre-written code but is necessary the usage of the DSP BIOS.

    Best, 

    Andrea