Lpc2000

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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