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problem in external interrupt handling in ARM LPC2138

hiiii

i am using ARM LPC2138 for my application.For one of my devices i am using its external interrupt pin .i am compliling my code in ARM mode.i am able to compile my code in KEIL as well as GCC without any warning.i am printing some values in my ISR routine.

the problem is: After executing the isr the system halts. Please suggest what could be the problem.

i am initialising my external interrupt registers EXTMODE & EXTPOLAR to 0x00 and interrupt vector registers as follows:

VICINTSELECT &= ~0x00004000; VICINTCTRL14 = ( unsigned long int )external_isr ;..................address of external isr routine VICINTCTRL14 = 0x0000002E ; VICINTENABLE |= 0x00004000;

in my isr i m printing some random values and resetting the flags and interrupt vector address as follows:

EXTINT |= 0x01 ; VICVECTADDR = 0x00000000; resetting the interrupt vector address to 0

Please suggest what could be the problem. thank you

Reply to
abhay
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And what do you have in your isr? maybe isr is causing the system halt.

ali

Reply to
Ali

Does your ISR return and function correctly? Vector does not look right...

Reply to
MisterE

I don't think you want the VIC Vector Address set to 0x0000000 - that is the reset vector. You are also setting programming the Interrupt Control register with your vector to your handler and then overwriting it with the real control word. Perhaps you might want to look at putting the vector of your handler into the vector register for interrupt 14?

Reply to
Tom Lucas

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