Hwi ISR can only be entered once

Hi all,

   I have encountered a strange thing that My hwi ISR can only be entered once.

My code is below, when first intrrupt occured, I can get the correct result. But after

that, that ISR can never be entered again even after I do CPU reset and run again.

The bios I use here is bios_6_31_00_18 and the platform I run is C6678.

With the help of debugger, I can see that the MSI0_IRQ_SET registers can not be cleared

by the function Hwi_clearInterrupt. So what's wrong with my code?

#include <ti/sysbios/family/c66/Cache.h>

#include <ti/sysbios/BIOS.h>

#include <xdc/runtime/Error.h>

#include <ti/sysbios/hal/Hwi.h>

volatile dataval = 0;

static void My_ISR (int arg)

{

    dataval = 1;

    Hwi_clearInterrupt(4);

}

void main(void)

{

   Hwi_Handle hwi0;

   Hwi_Params hwiParams;

   Error_Block eb;

   Error_init(&eb);

   Hwi_Params_init(&hwiParams);

   hwiParams.arg = 17;

   hwiParams.eventId = 17;

   hwi0 = Hwi_create(4, MY_ISR, &hwiParams, &eb);

   if(hwi0 == NULL)

      System_abort("Hwi create error");

   /* Call BIOS_start() */

   BIOS_start(); }

B.R.

Sunzhao