Lpc2000

--- In lpc2000@yahoogroups.com, vineet jain <vineetrvce@...> wrote:
>
> OR to put it simply,
> how would one write an interrupt based application to show time on 
> Hyperterm using LPC controller.
> 
> Both the UART and RTC are interrupt driven.
> >> So how to declare the ISR's if they both are meant to be IRQ
category interrupts.

As I indicated earlier, you can't define them both to be IRQ and then
have individual routines - there's only one IRQ vector.  I suppose you
could write code in the IRQ handler to handle both interrupts but why
bother?  The VIC was invented to solve this type of problem.

Maybe you could define one as FIQ and the other as IRQ but that is a
very limiting concept.

I don't have an example that meets your requirements.  But, how hard
can it be?  You need to define an interrupt handler for the timer and
put the address and priority into the VIC.  You need to define an
interrupt handler for the UART (enabling FIFO) and put the address and
priority in the VIC.

Of course you also have to prevent timer interrupts from changing the
time while you are in the process of accessing the data.

I haven't tried the UART via VIC and there are apparently some issues
re: the UART and interrupts.  I read about them here but have not
investiaged them for myself.

Richard