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