MSP432P401R: interrupt not working?

chethan sv

Part Number: MSP432P401R

Hi,

I'm using an above-mentioned controller, here interrupt is not working. when we give the interrupt, the controller executing the default handler.

For the port1.1 how can I make interrupt to this pin. And i didn't understand this line code NVIC->ISER[1] = 1 << ((PORT1_IRQn) & 31);

Check the below code, is there any mistake?

/*************************************************

#include <msp432p401r.h>
#include <stdint.h>

void main( void )
{

P2DIR |= BIT0; //P2.0 LED
P1DIR &= ~BIT1; // P1.1 Button
P1REN |= BIT1;
P1IE = BIT1;
P1IES = BIT1;
P1IFG = ~BIT1;
P2OUT = ~BIT0;

NVIC->ISER[1] = 1 << ((PORT1_IRQn) & 31);
__enable_interrupt(); // Enable global interrupts

while( 1 ) // Endless loop - main program
{
P2OUT = BIT0;

}

void port1_ISR_handler( void ) // Interrupt handler for port 1
{
int i;
P2OUT = ~BIT0;
P1IE &= ~BIT1;
for(i=10000; i>0; i--);
}

over 7 years ago

0 Bob Landers over 7 years ago

TI__Expert 8510 points

Chethan,

I'd recommend looking at the gpio_input_interrupt example on TI Resource Explorer. This example uses the driverlib API set, which is much more readable and portable between TI devices. I would look at this approach rather than register-level code.

If you still want to do this using register-level code, there is an example to do that also on that site.

-Bob L.

0 kazola over 7 years ago

Guru 18595 points

All this seem a bit wrong.
I have no CCS or MSP432 here but, for example, in the ISR you should P1IFG &= ~BIT1; (and this line should be in the init code too instead of the one you have) and also a long for in the ISR is not a good idea.

0 Bruce McKenney over 7 years ago

Guru 99595 points

> void port1_ISR_handler( void ) // Interrupt handler for port 1
Try:
> void PORT1_IRQHandler( void ) // Interrupt handler for port 1
These names can be found in startup_msp430p401r_ccs.c

Also:
> NVIC->ISER[1] = 1 << ((PORT1_IRQn) & 31);
This is probably more understandable written as:
> NVIC_EnableIRQ(PORT1_IRQn);

0 chethan sv over 7 years ago in reply to Bruce McKenney

Expert 1040 points

Hi,

Thanks all, the problem was resolved by changing the handler name from port1_ISR_handler( void ) to PORT1_IRQHandler( void ).

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MSP432P401R: interrupt not working?