reference program for external interrupt in tms320f28335

Hi Arun,

Did you download the latest controlSuite? It has all the reference sample codes and documentation.

Let me know if you need any help.

Regards,

Gautam

Hi Gautam,

thanks for your reply. yes i have already tried the program from control suite, but i am facing some problems.

Is it possible to use any GPIO pin as an external interrupt other than pin no.1 or 2.? If yes then can you please tell me the syntax of doing this.

Hi,

Why use interrupts to count pulses? You could miss them (overlapping pules).. You could use EQEP module to count for you! datasheet

If you really like to use the GPIO interrupts than it's possible to configure a GPIO group to generate XINTn interrupts, but thats only possible as a group of IO pins. See page 101 and below in datahseet

Otherwise you could use the NMI (non maskable interrupt).

Tjarco

Hi Arun,

s it possible to use any GPIO pin as an external interrupt other than pin no.1 or 2.?

Offcourse, you can implement it using other GPIOs. Here's the syntax:

// GPIO2 and GPIO3 are inputs
   EALLOW;
   GpioCtrlRegs.GPAMUX1.bit.GPIO2 = 0;         // GPIO2
   GpioCtrlRegs.GPADIR.bit.GPIO2 = 0;          // input
   GpioCtrlRegs.GPAQSEL1.bit.GPIO2 = 0;        // Xint1 Synch to SYSCLKOUT only

   GpioCtrlRegs.GPAMUX1.bit.GPIO3 = 0;         // GPIO3
   GpioCtrlRegs.GPADIR.bit.GPIO3 = 0;          // input
   GpioCtrlRegs.GPAQSEL1.bit.GPIO3 = 2;        // XINT2 Qual using 6 samples
   GpioCtrlRegs.GPACTRL.bit.QUALPRD0 = 0xFF;   // Each sampling window is 510*SYSCLKOUT
   EDIS;

// GPIO2 is XINT1, GPIO3 is XINT2
   EALLOW;
   GpioIntRegs.GPIOXINT1SEL.bit.GPIOSEL = 2;   // Xint1 is GPIO2
   GpioIntRegs.GPIOXINT2SEL.bit.GPIOSEL = 3;   // XINT2 is GPIO3
   EDIS;

// Configure XINT1 & XINT2
   XIntruptRegs.XINT1CR.bit.POLARITY = 0;      // Falling edge interrupt
   XIntruptRegs.XINT2CR.bit.POLARITY = 1;      // Rising edge interrupt

Regards,

Gautam

thanks gautam,

i tried your program for making GPIO pin no.50 and 51 as interrupt but it is not working. Actually the kit which i am using has only GPIO 48 to 63 pins available for connection rest all are not accessible.

Also i tried interrupt program from control suite but i am not able to understand it . Is there any other resource available?   

Hi,

Thanks for your advice!

I have tried to do it using EQEP module but i couldn't do it. If you can help me with a sample program it would be very helpful to me. I tried EQEP program from control suite for reference but it seems a bit difficult to understand. 

Maybe this could be something to try for you, I havent tried it but it's copied from existing EQEP configuration.

<code>

void  EQEP1_Init(void)
{        EALLOW;

        if(SysCtrlRegs.PCLKCR1.bit.EQEP1ENCLK != 0) asm(" ESTOP1");    //ALREADY INITIALISED BY OTHER CODE IN THS PROJECT!

        SysCtrlRegs.PCLKCR1.bit.EQEP1ENCLK =1;
        asm(" NOP"); asm(" NOP");

        EQep1Regs.QDECCTL.all=00;        // Quad mode, Latch on position counter read by CPU.
        EQep1Regs.QEPCTL.bit.FREE_SOFT=2;    // free run
        EQep1Regs.QEPCTL.bit.PCRM=00;        // PCRM=00 mode
        EQep1Regs.QPOSMAX=0xffffffff;        // use full 32 bits as reference to measure up and down
        EQep1Regs.QPOSINIT = 0x7fffffff;            // Initial value 0x7fffffff
        EQep1Regs.QEPCTL.bit.QPEN=1;         // QEP enable
        EQep1Regs.QDECCTL.bit.SWAP = 0;        // swap A and B inputs.

        GpioCtrlRegs.GPAMUX2.bit.GPIO20 = 1;    // GPIO20 is EQEP1A
            GpioCtrlRegs.GPAMUX2.bit.GPIO21 = 1;    // GPIO21 is EQEP1B

        GpioCtrlRegs.GPAPUD.bit.GPIO20 = 0;    // pull-up enabled
        GpioCtrlRegs.GPAPUD.bit.GPIO21 = 0;    // pull-up enabled

        EQep1Regs.QEPCTL.bit.SWI = 1;        // Initialize position counter (QPOSCNT=QPOSINIT).
        EQep1Regs.QEPCTL.bit.SWI = 0;

        EDIS;
}

void  EQEP2_Init(void)
{        EALLOW;

        if(SysCtrlRegs.PCLKCR1.bit.EQEP2ENCLK != 0) asm(" ESTOP1");    //ALREADY INITIALISED BY OTHER CODE IN THS PROJECT!

        SysCtrlRegs.PCLKCR1.bit.EQEP2ENCLK =1;
        asm(" NOP"); asm(" NOP");
        
        EQep2Regs.QDECCTL.all=00;        // Quad mode, Latch on position counter read by CPU.
        EQep2Regs.QEPCTL.bit.FREE_SOFT=2;    // free run
        EQep2Regs.QEPCTL.bit.PCRM=00;        // PCRM=00 mode
        EQep2Regs.QPOSMAX=0xffffffff;        // use full 32 bits as reference to measure up and down
        EQep2Regs.QPOSINIT = 0x7fffffff;            // Initial value 0x7fffffff
        EQep2Regs.QEPCTL.bit.QPEN=1;         // QEP enable
        EQep2Regs.QDECCTL.bit.SWAP = 0;        // swap A and B inputs.

        GpioCtrlRegs.GPAMUX2.bit.GPIO24 = 2;    // GPIO20 is EQEP1A
            GpioCtrlRegs.GPAMUX2.bit.GPIO25 = 2;    // GPIO21 is EQEP1B

        GpioCtrlRegs.GPAPUD.bit.GPIO24 = 0;    // pull-up enabled
        GpioCtrlRegs.GPAPUD.bit.GPIO25 = 0;    // pull-up enabled

        EQep2Regs.QEPCTL.bit.SWI = 1;        // Initialize position counter (QPOSCNT=QPOSINIT).
        EQep2Regs.QEPCTL.bit.SWI = 0;
        EDIS;
}

void main(void){

/*Some system inits here*/

EQEP1_Init();

EQEP2_Init();


 do{
    =EQep1Regs.QPOSCNT; // counter value
    EQep1Regs.QEPCTL.bit.SWI = 1; //Initialize position counter (QPOSCNT=QPOSINIT).

    =EQep2Regs.QPOSCNT; // counter value
    EQep2Regs.QEPCTL.bit.SWI = 1; //Initialize position counter (QPOSCNT=QPOSINIT).

    udelay(5000);

 }while(1);


}//end main

</code>