Lpc2000

Please download the User Manual for the device you are using and take a 
look at the chapter named "System Control Block" section "External 
Interrupt Inputs".
Your will find the description for EXTMODE and EXTPOLAR for changing the 
mode (edge or level) and polarity.

Richard Duits.


frumbub wrote:

> Is there any way of chosing on what level the interrupt should trigger
> (logic 1 or 0)? As it is now it triggers on 0.
>
>
> --- In lpc2000@yahoogroups.com, "frumbub" <j_lilje@h...> wrote:
> > Problem solved!
> > Thanks for the help. (sometimes it helps just to write down the
> > problems ;) )
> >
> > --- In lpc2000@yahoogroups.com, "frumbub" <j_lilje@h...> wrote:
> > > Yes that stops th infinite loop, but another problem remains.
> > > It seems that the ISR dont returns. The system freezes.
> > > Any ideas?
> > >
> > > --- In lpc2000@yahoogroups.com, Richard Duits <yahoo@r...> wrote:
> > > > You need to clear the external interrupt (even with level sensitive
> > > > interrupts) with like in the following code:
> > > >
> > > > void eint_ISR( void )
> > > > {
> > > >   vParTestToggleLED( 0 );
> > > >     EXTINT = 1;  /* clear EINT0 */
> > > >     VICVectAddr = 0; /* acknowledge interrupt */
> > > > }
> > > >
> > > >
> > > > Richard Duits
> > > >
> > > >
> > > > frumbub wrote:
> > > >
> > > > > Hello
> > > > >
> > > > > I am having problems with the EINT0 interrupt.
> > > > > I have searched the posts and tried all suggested sollutions,
> but my
> > > > > problem persists.
> > > > >
> > > > > The problem is that the system stays in the ISR like in an
> > > infinite loop.
> > > > >
> > > > > Code:
> > > > > void eint_ISR( void )
> > > > > {
> > > > >       vParTestToggleLED( 0 );
> > > > >       VICVectAddr = ringCLEAR_VIC_INTERRUPT;
> > > > > }
> > > > > And thats it... the vParTestToggleLED( 0 ) function just toggles
> > a led
> > > > > one time, that is verified, but when EINT0 is triggered if flashes
> > > > > endlessly and the other processes are blocked.
> > > > >
> > > > > The EINT0 setp code:
> > > > >
> > > > > VICIntSelect &= ~( RING_VIC_CHANNEL_BIT );
> > > > > VICIntEnable |= RING_VIC_CHANNEL_BIT;
> > > > > VICVectAddr2 = ( portLONG ) vRING_ISR;
> > > > > VICVectCntl2 = RING_VIC_ENABLE | RING_VIC_CHANNEL;
> > > > >
> > > > > /* Enable EINT0 interrupt. */
> > > > > PCB_PINSEL1 |= EINT0_ENABLE;
> > > > >
> > > > > Please help me out...
> > > > >
> > > > >
> > > > >
> > > > >
> > >
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