RTOS/OMAP-L138: Sometimes OMAP-L138 DSP interrupt Status Register not set.

Part Number:OMAP-L138

Tool/software:TI-RTOS

Hello.

I have some questions about Omap-L138 DSP Interrupt. Please help.

I connect ADC busy pin to GPIO7_0, That's why I will use ADC busy signal for DSP interrupt.

DSP interrupt working good when it ADC busy pin set,

but sometimes Register about DSP interrupt INTSTAT67 [GPIO Banks 6 and 7 Interrupt Status Register] not set 1.

I check INTSTAT67 Register like this.

    if (gpioRegs->BANK[GP7].INTSTAT & CSL_GPIO_INTSTAT_STAT16_MASK)
    {

printf(" Success \n");

    }

    else printf(" Fail \n");

but sometimes this sentence doesn't work. I can see few messages "Fail".

How can i fix it?

Best Regards