MSP430: Trying to learn interrupts using button and LED blinking - interrupt

Question

I'm learning the MSP430 for the first time, and trying to teach myself interrupts.
I'm trying to follow these examples 1 2 3 4.
I'm using an MSP430FR6989 eval board and writing the code in Code Composer Studio.
I'm trying to have the REDLED on the board toggle when I push the P1.1 button (ie, using an interrupt).
I'm able to blink the LEDs using separate code, so I know the board works.
This is the code that i'm trying to get to work.
#include <msp430.h>
#include "driverlib.h"
int main(void) //Main program
{
WDTCTL = WDTPW + WDTHOLD; // Stop watchdog timer
P1DIR |= BIT0; // Set P1.0 to output and P1.3 to input direction
P1OUT &= ~BIT0; // set P1.0 to Off
P1IE |= BIT3; // P1.3 interrupt enabled
P1IFG &= ~BIT3; // P1.3 interrupt flag cleared
__bis_SR_register(GIE); // Enable all interrupts
while(1) //Loop forever, we'll do our job in the interrupt routine...
{}
}
#pragma vector=PORT1_VECTOR
__interrupt void Port_1(void)
{
P1OUT ^= BIT0; // Toggle P1.0
P1IFG &= ~BIT3; // P1.3 interrupt flag cleared
}
When I press the button, the LED doesn't turn on and I'm not sure why.
I'd appreciate any help!
To show a working LED Blink program as requested by user #CL
#include <msp430.h>
#include "driverlib.h"
int main(void)
{
WDTCTL = WDTPW + WDTHOLD; // Disables the watchdog
PM5CTL0 &= ~LOCKLPM5; // allows output pins to be set... turning off pullups
P1DIR = BIT0; // Make a pin an output... RED LED
long x = 0; // Will be used to slow down blinking
while(1) // Continuously repeat everything below
{
for(x=0 ; x < 30000 ; x=x+1); // Count from 0 to 30,000 for a delay
P1OUT = BIT0; // Turn red LED light on
for(x=0 ; x < 30000 ; x=x+1); // Count from 0 to 30,000 for a delay
P1OUT ^= BIT0; // Turn off the red LED light
}
}

Answer 1

On the MSP430FR6989 LaunchPad, P1.3 is not connected to a button. Use P1.1 instead.
The button requires a pull-up resistor, so you have to configure it in P1REN and P1OUT.
It might be a good idea to configure the signal edge for the interrupt in P1IES.
You have to clear LOCKLPM5 to activate the port settings.
All this can be seen in the msp430fr69xx_p1_03.c example program.