Hey.

Rising Edge interrupt on GPIO Port 0 and Port 2:

Acording to the manual there are 4 external interrupts. EINT0, EINT1
and EINT2 are for specific port pins but EINT3 can be used for 1
specific pin and Port 0 and Port 2 pins..

I've setup external interrupt on rising edge for EINT3 and set Port0,4
for rising edge interrupt. But my interrupt are not edge triggered but
level triggered(Used a capacitor to slowly decharge the pin and it
fires multiple interrupts at about 3v). I tested EINT0 and used the
specified Port, and it works fine.

Am I doing something wrong?

Regards
Jonas Christensen, Denmark.

Sample of my code;

void init(void) {
//set port0,4 and port 0,5 to GPIO
PINSEL0 &= 0xFFFFF0FF;

//set EINT3 to edge sensitive
EXTMODE = 8;
//set EINT3 to rising-edge sensitive
EXTPOLAR = 8;
//need to clear this bit acording to the manual.
EXTINT = 8;

//enable rising edge interrupt on port0,4 and port0,5
IO0IntEnR = 0x10 | 0x20;
//Now enable EINT3 interrupt.
//Use Crossworks and and CTL API.
ctl_set_isr(17, 0, CTL_ISR_TRIGGER_FIXED,EdgeTrigger, 0);
ctl_unmask_isr(17);
}

void EdgeTrigger(void) {
//check if rising edge interrupt on port0,4
if (IO0IntStatR & 0x10) {
//do something....

//clear interrupt
IO0IntClr = 0x10;
}
}

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Hey

We found the problem. It was a circet without hysteresis that was
connected to the input pin.

Special thanks to Kees from NXP who helped trouble shoot.
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