Part Number: MSP432P401R
Other Parts Discussed in Thread: CODECOMPOSER
Tool/software: Code Composer Studio
It is my first time using interrupts with the MSP432, and I already followed every step (changing the setup file, enabling interrupts in the code, etc). When I try to build the code in CodeComposer I get an error that NVIC is not defined. I already try everything, but I do not know how to change that. If you could help me I will be very thankful.
#include <msp432p401r.h>
#include <stdint.h>
// LED1 @ P1.0
// Button S1 @ P1.1
volatile uint8_t button_flag = 0; // Flag to signal button press
volatile uint32_t deb_cnt; // Counter for debouncing button
void main( void )
{
WDTCTL = (WDTPW | WDTHOLD); // Stop watchdog timer
P1SEL0 = 0x00; // Clear selection register 0 for port 1
P1SEL1 = 0x00; // Clear selection register 1 for port 1
P1REN = 0x02; // Enable resistor for S1 (P1.1)
P1OUT = 0x02; // S1 (P1.1) high -> pull-up resistor, others low
P1DIR = 0x01; // LED1 (P1.0) to output direction, others input
P1IES = 0x02; // Interrupt on high->low transition for S1 (P1.1)
P1IFG = 0x00; // Clear any pending flags
P1IE = 0x02; // Enable interrupt for S1 (P1.1)
NVIC_ISER1 = 1 << ((INT_PORT1 - 16) & 31); // Enable interrupts for port 1 in the NVIC module
__enable_interrupt(); // Enable global interrupts
while( 1 ) // Endless loop - main program
{
if( button_flag )
{
P1OUT ^= 0x01; // Toggle LED1 (P1.0)
for( deb_cnt = 0; deb_cnt < 20000; deb_cnt++ ); // Software delay for debouncing button - NOT TO USE IN A REAL PROGRAM
button_flag = 0; // Reset flag
P1IFG &= ~0x02; // Clear pending interrupt flag for S1 (P1.1)
P1IE |= 0x02; // Enable interrupt for S1 (P1.1)
}
}
}
void port1_ISR_handler( void ) // Interrupt handler for port 1
{
P1IE &= ~0x02; // Disable interrupt for S1 (P1.1) for debouncing
button_flag = 1; // Set flag to signal button press detected
}
