Mask vs disable interrupts

[zorandjokic]

I am working with LPC2378. I would like to mask (not disable) timer interrupt (10ms) during few instructions and than to unmusk it, so if timer interrupt happens during execution of those instructions, CPU would enter timer int. routine, after being unmasked.

Could it be done with this ARM device ? The same question regarding UARTs.

Thanks

[zorandjokic]

A little test that I've made can be described with next pseudocode lines:

--- Init UART0 and define int. routine ---
VICSWPrioMask &= ~(1<< VICVectPriority6); //mask
--- wait for (devel. board) key press ---
VICSWPrioMask |= (1<< VICVectPriority6); //unmask
while(1){}

After CPU RESET, processor is waiting for key to be pressed. Using terminal
program, I've sent single character from PC, after which I pressed the key.
When processor passes "unmask" part of code it branches to interrupt routine.

Regards

[jeremyzhou]

Hi Zoran Djokic,

Thank you for your interest in NXP Semiconductor products and 

for the opportunity to serve you.

1) Could it be done with this ARM device ?

ARM7 architecture doesn't seem to support to suspend the masked interrupt, then execute it after be unmasked.

Hope this is clear.

Have a great day,
TIC

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