TMS320C6678: GPIO Interrupt Setting

Hi Li,

Kindly follow the SDk documentation to give inteerupt via GPIO. URL : https://software-dl.ti.com/processor-sdk-rtos/esd/docs/latest/rtos/index_device_drv.html#gpio.

Kindly refer the GPIO API reference guide in TI-RTOS SDK in following location : C:\ti\pdk_c667x_X_X_XX\packages\ti\drv\gpio\docs\doxygen\html\index.html

Also, Refer the example of GPIO Interrupt customization (AM57X) in this link : https://software-dl.ti.com/processor-sdk-rtos/esd/docs/latest/rtos/index_how_to_guides.html#rtos-customization-using-an-external-input-to-trigger-an-interrupt-on-am57x

Thanks,

Rajarajan U

Hi Li,

We can control GPIO using two libraries,

1. CSL
2. GPIO

Code that you have implemented was using CSL API, the below code uses code functions from the CSL API (location : {TI_SDK_INSTALL_DIR}\pdk_c665x_2_0_16\packages\ti\csl\docs\doxygen\html\group___c_s_l___g_p_i_o.html

I have modified your code,

    // 2. Trigger GPIO_14 in Module 0
    pinNum = 14; 
    bankNum = 0;

    // Open the CSL GPIO Module 0
    hGpio = CSL_GPIO_open (0);

	// Enable GPIO per bank interrupt for bank zero
    CSL_GPIO_bankInterruptEnable (hGpio, bankNum);

    // Set GPIO pin number as an input pin
    CSL_GPIO_setPinDirInput (hGpio, pinNum);

    // Set interrupt detection on GPIO pin to rising edge
    CSL_GPIO_setRisingEdgeDetect (hGpio, pinNum);

   // Check interrupt status on pin 1
     while (CSL_GPIO_getInterruptStatus (hGpio, pinNum) == 0)
     {
         // Interrupt has not occured, waiting in while loop

     }

Use this code in "main()", intead of "intIsr" interrupt. I am reaing the status of "Interrupt Status" register in while loop. This document helped in GPIO register info (link : GPIO for keystone devices 

Thanks,

Rajarajan U

Hi Li,

#include "ti/csl/csl_chip.h"
#include "ti/csl/csl_chipAux.h"
#include "ti/csl/src/intc/csl_intc.h"
#include "ti/csl/csl_gpio.h"
#include "ti/csl/csl_gpioAux.h"
#include <stdio.h>

CSL_IntcContext intcContext;
CSL_IntcEventHandlerRecord EventHandler[30];
CSL_IntcObj intcObj;
CSL_IntcHandle hTest;
CSL_IntcGlobalEnableState state;
CSL_IntcEventHandlerRecord EventRecord;
CSL_IntcParam vectId;
CSL_GpioHandle hGpio;


volatile int a = 0;

int count = 0;

interrupt void intIsr(void)
{
    if (CSL_GPIO_getInterruptStatus (hGpio, pinNum) == 0)
    {
        a = 1;
        count++;
    }
}

void main(void)
{
    //GpioInit(); //GPIO Initialization
    int pinNum;
    int bankNum;

    /************************************************
    *************** INTC Configuration *************
    ************************************************/

    printf ("Debug: GEM-INTC Configuration...\n");

    /* INTC module initialization */
    intcContext.eventhandlerRecord = EventHandler;
    intcContext.numEvtEntries = 10;
    if (CSL_intcInit(&intcContext) != CSL_SOK)
    {
        printf("Error: GEM-INTC initialization failed\n");
        return;
    }

    /* Enable NMIs */
    if (CSL_intcGlobalNmiEnable() != CSL_SOK)
    {
        printf("Error: GEM-INTC global NMI enable failed\n");
        return;
    }

    /* Enable global interrupts */
    if (CSL_intcGlobalEnable(&state) != CSL_SOK)
    {
        printf ("Error: GEM-INTC global enable failed\n");
        return;
    }

    /* Open the INTC Module for Vector ID: 4 and Event ID: 88 (GPIO_n in C6678)*/
    vectId = CSL_INTC_VECTID_4;
    hTest = CSL_intcOpen (&intcObj, 88, &vectId , NULL);
    if (hTest == NULL)
    {
        printf("Error: GEM-INTC Open failed\n");
        return;
    }

    /* Register an call-back handler which is invoked when the event occurs. */
    EventRecord.handler = &intIsr;
    EventRecord.arg = 0;
    if (CSL_intcPlugEventHandler(hTest,&EventRecord) != CSL_SOK)
    {
        printf("Error: GEM-INTC Plug event handler failed\n");
        return;
    }

    /* Enabling the events. */
    if (CSL_intcHwControl(hTest,CSL_INTC_CMD_EVTENABLE, NULL) != CSL_SOK)
    {
        printf("Error: GEM-INTC CSL_INTC_CMD_EVTENABLE command failed\n");
        return;
    }

    printf ("Debug: GEM-INTC Configuration Completed\n");

    // 1. Init Flag
    a = 0;
    printf("a = %d\n",a);

    // 2. Trigger GPIO_14 in Module 0
    pinNum = 14; 
    bankNum = 0;

    // Open the CSL GPIO Module 0
    hGpio = CSL_GPIO_open (0);

	// Enable GPIO per bank interrupt for bank zero
    CSL_GPIO_bankInterruptEnable (hGpio, bankNum);

    // Set GPIO pin number as an input pin
    CSL_GPIO_setPinDirInput (hGpio, pinNum);

    // Set interrupt detection on GPIO pin to rising edge
    CSL_GPIO_setRisingEdgeDetect (hGpio, pinNum);


    // 3. Wait for entering into ISR
    while(a!=1){}

    printf("a = %d\n",a);
    printf("GPIO interrupt occurs\n");

    while(1){}
}

Li Guangchen said:

So maybe I can't replace the  "intIsr" interrupt with a while loop in "main()"

I have modified the interrupt function to suit your condition, kindly check this works for you.

Thanks,

Rajarajan U