Lpc2000

Hi Richard,
              Thanks for your reply.I removed "VICVectCntl4 > = (0 <<
5)| VIC_EINT3;" line form the program.
             I missed "VICIntEnable = VIC_BIT(VIC_EINT3);" in my
enableEXTinterrupt() function. Now External interrupt is working.

              Though it is working, I am facing a new problem. ISR
executes only for the first time. It fails for rest of the interrupts.
I don't know why this is happening.

Thanks & Regards,
Mohan




On 6/14/05, Richard Duits <yahoo@...> wrote:
> Hello Mohan,
> 
> Check out the errata for the lpc2138. The lpc2xxx chips have some issues 
> with the EXTMODE and EXTPOLAR registers. Don't know if this affects your 
> code, because I don't have the rest of your code. Also the "VICVectCntl4 
> = (0 << 5)| VIC_EINT3;" does not need to be in the ExtInterrupt routine.
> 
> RD.
> 
> 
> 
> Mohan K wrote:
> 
> > Hi all,
> >        I am trying to the external interrupt 3 of lpc2138 to invoke
> > the trackball routine. But the controller is not responding. The
> > following is the code i am using.
> >
> > static void __attribute__ ((interrupt("IRQ"))) ExtInterrupt(void)
> > {
> >       VICVectCntl4 = (0 << 5)| VIC_EINT3;
> >       //PCON=0x00;
> >       //PCONP = 0x001817BE;
> >       time=0;
> >       init_trackball();
> >       EXTINT=0x08;
> >       VICVectAddr = 0x00000000;
> > }
> > void enableEXTinterrupt(void)
> > {
> >       PINSEL1 |= 0x20000000;
> >       //INTWAKE = 0x0008;
> >       EXTMODE  = 0x08;
> >       EXTPOLAR = 0x00;
> >       VICVectAddr4 =(unsigned int)ExtInterrupt;
> >          VICVectCntl4 = VIC_ENABLE | VIC_EINT3;  
> > }
> >
> > Am i missing anything? Advanced thanks for any suggestions.
> >
> > Thanks & regards,
> > Mohan
> >
> >
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