Arm Development Studio forum Corrupted value in register after interrupt on LPC2368

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Corrupted value in register after interrupt on LPC2368

Note: This was originally posted on 21st July 2009 at http://forums.arm.com

Hello,

I've hit a wall guys...

My problem is as follows:

1. all the processes run normally
2. then external interrupt occures
3. I handle it with eint3 handler (external interrupt 3)
4. after returning form eint3 handler sometimes - not always -
r4 register containes corrupted value. Insted of containing value
which was in before the eint3 interrupt it contains - as it seems -
the value of stack pointer of user mode

Any ideas?

for clearifing my point

void main(void)
{
   while(1)
   {
     /*some code*/
     results_process(); --> eint3handler()
                                     {
                                       /*some code*/
                                platform_powerdown()-->application_powerdown();
                                       /*end of eint3 handler*/
                                     }
   /*register r4 gets corrupted sometimes*/
   }
 
}

I use RVCT 2.2
All the code is written in THUMB mode, except for eint3_handler which is in ARM mode.

best regards

uros