Lpc2000

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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