TMS320F28034: PIE vector table re-map issue

Hi, 

Customer is using F28034 for motor control. Now they face one issue about PIE vector table re-mapping.

During system power up/down test, very few times, in fun2(), test1 can be 10 instead of 20, which is quite confused. What can be the issue?

F28034 external reset is setting to 3.14V. Power up/down frequency is from 1s, 2s, 3s and step to 10s, and again to 1s, 2s... During power down, after 5s, reset pin is driven low; after 6s, F28034 totally lost the power. 3.3V went to 0V.   

The code is like this:

main()

{

system_peripheral_init();

test1=10;      // test1 default value 10

EALLOW;

PieVectTable.ADCINT1=&fun1();     // map to fun1()

EDIS;

EINT;

for(;;)

{ 

    if(...)       // the condition will be true for only one time; 

    {

        test1=20;       // test1 set with another value 20

        EALLOW;

         PieVectTable.ADCINT1=&fun2();       // Re-map, to func2(), it's executed only one time.

        EDIS;

    }//if(...)

    ...

    ...

}//for(;;)

}//main()

fun1()  {...}

fun2()

{

printf(test1);

}

Thanks a lot.

Br, Jordan