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ISR is not responding to the non-vectored interrupt in LPC2138

Kumar Anand

Hi,

Below is the example code which is readily available on net for non-vectored interrupt to be used for LPC microcontroller. But even when I am giving an interrupt the ISR is not responding. Following are more details:

IDE: Keil uvision
Target: LPC2138

Steps considered:

1. After building the project when I go for debugging then Pin Connect Block is working fine and the pin P0.14 is selected as EINT1.

2. In VIC window I can see the default address (0x00000018 in my case). I verified the address from disassembler also.

3. In VIC window I can see '1' in the IntEnable column. Which means the interrupt is enabled.

4. Now when I tried to give an interrupt from the GPIO 0 window then in the "External Interrupt" window I can see the flag has been set for EINT1.

But the program is not able to reach ISR.

 #include <LPC21xx.h>

void NonVectoredIRQ (void) __irq
{
        if(VICIRQStatus & 0x00008000)//Test for the interrupt source
                {
                        IOSET1= 0x00FF0000; //Set the LED pins
                        EXTINT = 0x00000002; //Clear the peripheral interrupt flag
                }
                VICVectAddr = 0x00000000; //Dummy write to signal end of interrupt
}

int main (void)
{
        IODIR1 =0x00FF0000; //Set the LED pins as outputs
        PINSEL0 = 0x20000000; //Enable the EXTINT1 interrupt P0.14
        VICDefVectAddr = (unsigned long)NonVectoredIRQ; //pass the address of the IRQ
        VICIntEnable= 0x8000; //Enable EXTINT0 in the VIC
        while(1);
}

Please Help.
Regards

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