Re: [Mspgcc-users] P2IFG

[Arnd-Hendrik Mathias]

Hi  Karan,
can you post the code of your ISR?
Regards

Arnd-Hendrik

karan wrote:

hi,

i really need this problem solved.
its holding up a lot of my work.
could any of you guys please help me out??

thanks
karan

On Sat, 2004-10-02 at 11:08, karan wrote:

/how do i detect a gpio interrupt??

i am using the msp430 stk2 kit from olimex which has the msp430449.

there is a sender msp430 which is intermittently
setting bit4 on the P2 port, which is on the EXT connector.

there is a receiver msp430 which should detect when a transition has taken place

on the P2.BIT4 through the EXT connector.

this is my code for the receiver:

# include  <io.h>
# include  <signal.h>

int main(void)
{
  WDTCTL = WDTPW + WDTHOLD;                 // Stop WDT

  _EINT();                              // Enable interrupts

  P2DIR &= ~BIT4;              // input direction
  P2SEL &= 0x00;               // select gpio function

  P2IES &= ~BIT4;             // set p2bit4 for low-to-high transition
  P2IE |= BIT4;                  // enable interrupt on bit4 of port2

  while(1)
    {

if ((P2IFG & BIT4) == BIT4) // has interrupt flag been set for bit4?

            {
                // do something here
             P2IFG &= ~BIT4;            // unset interrupt flag
            }
    }

return 0;

}

but this is not happening.
the receiver does not detect this interrupt.

am i doing something wrong?

thanks
karan/
CM II
Resolution Systems Inc.

CM II
Resolution Systems Inc.