Lpc2000

Thanks for that. The controller now does not hangup during 
initialization, however, it still processes the interrupt only once. 
i.e. after the 1st interrupt, all other interrupts are ignored. I am 
clearing the EINTx flag by writing a 1 to that bit.
Has anyone managed to use external interrupts without such problems?

Regards,

Musharraf Hanif

--- In lpc2000@yahoogroups.com, "douglasbolton" <doug@c...> wrote:
> --- In lpc2000@yahoogroups.com, Musharraf Hanif 
> <musharraf_hanif@y...> wrote:
> > Hi,
> > 
> > I am trying to setup my LPC2129 (MCB2100) to respond
> > to external interrupts. I am using the following
> > initialization sequence (For the interrupt):
> > 
> > ........
> > VICVectAddr3 = <whatever>;
> > VICVectCntl3 = 0x2F;
> > ........
> > ........
> > //Change mode of the interrupt pin
> > PIN_Set_Mode(014,1,0); //P0.14 with mode bits 10
> > ........
> > EXTMODE |= 0x02; //Use Edge triggered
> > EXTWAKE |= 0x02; //Interrupt wake the processor
> > ........
> > EXTINT |= 0x02; //Clear the EINT1 interrupt source
> > ........
> > VICIntEnable |= 0x008000; //Enable EINT1
> > ........
> > while(1)
> >   {
> >   Function_to_toggle_a_GPIO_pin();
> >   Delay();
> >   }
> > 
> > In the ISR:
> > {
> > EXTINT |= 0x02; //clear the source of the interrupt
> > Counter_G++;
> > Display_value_of_Counter();
> > } 
> > 
> > Now for the problems:
> > 
> > With this initialization sequence, the initialization
> > stops when changing to edge triggered mode. By
> > removing this and the following line (Wake up
> > related), the initialization runs all the way through.
> > However, in this mode, it is in level triggered mode.
> > triggering the interrupt causes the counter to be
> > updated.... however, this happens only once... while
> > the back ground task continues to run, showing that
> > the ISR is exited....
> > 
> > I should also mention that incase of an undefined
> > interrupt, the system goes into an infinite loop...
> > could this and enabling the VIC channel before setting
> > up the interrupt be the cause of the problem?
> > 
> > Can anyone help me in solving this problem?
> > 
> > Regards,
> > 
> > Musharraf Hanif
> > 
> > 
> > 		
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> 
> 
> Take a look at the errata data sheet . There are some known 
problems 
> and work arounds with external interrupts. 
> 
> Doug