Lpc2000

--- In lpc2000@yahoogroups.com, "rtstofer" <rstofer@...> wrote:
>
> --- In lpc2000@yahoogroups.com, "mgiaco82" <mgiaco82@> wrote:
> >
> > I found this on the Page from Rowley.
> > 
> > >>I'm trying to use vectored interrupts on the LPC2000. I've 
> > programmed >>up the VIC but when the interrupt occurs the 
program 
> > jumps to >>the "irq_handler" label/function, not the ISR I have 
> > configured using >>the VIC.
> > 
> > >>How do I make the LPC2000 jump to my vectored ISR when the 
> > interrupt >>occurs? 
> > 
> > Answer:     
> >  
> > You need to have the instruction "ldr pc, [pc, #-0xFF0]" located 
at 
> > the IRQ exception vector for vectored interrupts to work.
> > 
> > To do this make sure you have the preprocessor definition 
> > VECTORED_IRQ_INTERRUPTS defined when you compile the 
> > Philips_LPC210X_Startup.s file.
> > 
> > This mean i have to define anything before i can use the vic?
> > Can anybody explain pleas.
> > 
> > thanks mathias
> >
> 
> Yes, you have to do 'something' to alter the way in which the 
startup
> file is assembled.  Look at the Philips_LPC????_Startup.s file. 
> Somewhere (maybe around line 86) you will find:
> 
> #ifdef VECTORED_IRQ_INTERRUPTS
>   .word 0xB9205F84                    /* boot loader checksum */
>   ldr pc, [pc, #-0xFF0]               /* irq handler */
> #else
>   .word 0xB8A06F60                    /* boot loader checksum */
>   ldr pc, [pc, #irq_handler_address - . - 8]    /* irq handler */
> #endif
> 
> One way to get VECTORED_IRQ_INTERRUPTS defined is to put, at the 
top
> of the .S file:
> 
> #define VECTORED_IRQ_INTERRUPTS
> 
> Maybe put that just before:
>   .section .vectors, "ax"
> 
> If you do it that way, you will want to import the .s file to the
> specific project rather than linking to a modified master copy.  
Right
> click on the file name in the Project Explorer dialog and select
> Import.  Put the copy with the other source files for the project.
> 
> There is probably a much better way to do this.  At the moment, I
> can't find it.
> 
> Richard
>

Hallo Richard, thanks for the message. Pleas can you give me a 
detailed description of that. I don't see the point.

When I use the sample code from rowley for the timer irq it works. 
But with der uart code, i have ported, it doesn´t work.

thanks,

mathias