Problem in Timer ISR

Anand Chandrasekhar

I have put a small code in the Timer ISR.

Its strange to find that the code in the ISR is not getting executed completely.

Following is my ISR subroutine.

interrupt void TINT_isr(void)
{
   static Int16 ctr = 1U;
    *CPU_TIM0_IER     = 0x0001U;             /* clear Timer0 interrupt flag */
    *CPU_TIMINT_AGGR |= 0x0001U;                        /* clear Timer0 bit */
    if (--ctr == 0)     {                             /* did 1/2 second elapse? */
        static Int16 is_on = 1U;
        ctr = BSP_TICKS_PER_SEC / 2;
        if (is_on) {
            USBSTK5515_ULED_off(0U);
            *SARGPOCTRL ^= 0x0008;
       }
        else {
            USBSTK5515_ULED_on(0U);
            *SARGPOCTRL ^= 0x0008;
        }
        is_on = !is_on;
    }
}

in this ISR i can see the ULED glowing, but i cant see this *SARGPOCTRL ^= 0x0008 in the GP03 pin

Can some1 help

over 12 years ago

0 Anand Chandrasekhar over 12 years ago

Intellectual 525 points

Using CRO, i just checked the output from GPIN pin ( which i have configured as output)

using the floowing code : *SARGPOCTRL |= (1<<7);

But I am not able to get any output , but i can see the ULED toggling !!!!!!

0 Anand Chandrasekhar over 12 years ago in reply to Anand Chandrasekhar

Intellectual 525 points

Finaly got it right..

Just posting so that if ny1 had simial issues..

I had initialialised functions in this order - >

1. sar_adc()

2. timer();

Because of this, somehow *SARGPOCTRL was gettting affected.

When i chanaged the initialization order, to

1. timer();

2. sar_adc()

Everything is working fine !!!

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Problem in Timer ISR