Lpc2000

Hello
What is the purpose or use of this register
Vector Address Register. 
When an IRQ interrupt occurs, the IRQ service VICVectAddr routine can
read this register and jump to the value read.
Is it used for OS priority scheduling purpose or for some other reasons

Check out the ARM document:

http://www.arm.com/pdfs/DDI0181E_vic_pl190_r1p2_trm.pdf

(This link may be found in the Links section of this forum).

Very comprehensive document, that's easy enough to read.

--- In lpc2000@yahoogroups.com, "Gopalakrishnan" <naray23@...> wrote:
>
> Hello
> What is the purpose or use of this register
> Vector Address Register. 
> When an IRQ interrupt occurs, the IRQ service VICVectAddr routine 
can
> read this register and jump to the value read.
> Is it used for OS priority scheduling purpose or for some other 
reasons
>

Hello gopal,
               In VIC, we can configure the interrupts according to the 
priority.
Maximum we can configure 16 interrupts.It will vary from 0 to 16.
For ecah interrupt,they already defined some predined address.


If you write the code like this means,
        VICVectAddr1 = (unsigned)EXTINTVectoredIRQ; 

This ISR function will be call from the Predefined address.


It means we configure certain tasks,if the interrupt is rised.






Hello
What is the purpose or use of this register
Vector Address Register. 
When an IRQ interrupt occurs, the IRQ service VICVectAddr routine can
read this register and jump to the value read.
Is it used for OS priority scheduling purpose or for some other reasons





 
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