Lpc2000

I just have a small question on IRQ Interrupts...can an IRQ channel 
interrupt another IRQ routine (lower IRQ priority) that's currently 
executing?

To make this question more practical, let's say I assign TIMER0 & 
UART0 as IRQs where:
TIMER0 --> VIC Vector Control 0
UART0 --> VIC Vector Control 1

Can TIMER0 interrupt UART0 even if UART0's being serviced? If yes, 
what would be the best way to avoid possible data-share problems?

thanks in advance,
Leighton

Leighton,

Nesting interrupts is possible with ARM (switch to
system_mode & clear the I-bit to reanable interrupts).
Without the VIC, it's not possible to priotitize among
interrupts. With the VIC, I am not sure.

Cheers,
-Mike.

--- Leighton Rowe <leightonsrowe@...> wrote:

> 
> I just have a small question on IRQ Interrupts...can
> an IRQ channel 
> interrupt another IRQ routine (lower IRQ priority)
> that's currently 
> executing?
> 
> To make this question more practical, let's say I
> assign TIMER0 & 
> UART0 as IRQs where:
> TIMER0 --> VIC Vector Control 0
> UART0 --> VIC Vector Control 1
> 
> Can TIMER0 interrupt UART0 even if UART0's being
> serviced? If yes, 
> what would be the best way to avoid possible
> data-share problems?
> 
> thanks in advance,
> Leighton
> 
> 
> 
> 
> 



		
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