Lpc2000

--- 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