MSP432跳不出定时器A中断为什么

一般是这样的。
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 *                       MSP432 CODE EXAMPLE DISCLAIMER
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 * MSP432 code examples are self-contained low-level programs that typically
 * demonstrate a single peripheral function or device feature in a highly
 * concise manner. For this the code may rely on the device's power-on default
 * register values and settings such as the clock configuration and care must
 * be taken when combining code from several examples to avoid potential side
 * effects. Also see www.ti.com/.../mspdriverlib for an API functional
 * library & https://dev.ti.com/pinmux/ for a GUI approach to peripheral configuration.
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//******************************************************************************
//  MSP432P401 Demo - Timer32 Example, One-shot and periodic mode
//
//  Description: Timer 32 (module 0) is set up in 32-bit, periodic mode. Timer
//  is configured to count down from a pre-loaded value to 0. Interrupt triggers
//  when timer count is equal to 0. Timer32 interrupt service routine (ISR)
//  toggles P1.0 LED.
//
//          MSP432P401x
//         ---------------
//     /|\|               |
//      | |               |
//      --|RST            |
//        |               |
//        |           P1.0|-->LED
//
//   William Goh
//   Texas Instruments Inc.
//   June 2016 (updated) | November 2013 (created)
//   Built with CCSv6.1, IAR, Keil, GCC
//******************************************************************************
#include "msp.h"

int main(void)
{
    WDT_A->CTL = WDT_A_CTL_PW |             // Stop WDT
            WDT_A_CTL_HOLD;

    // Configure GPIO
    P1->DIR |= BIT0;
    P1->OUT &= ~BIT0;

    // Timer32 set up in periodic mode, 32-bit, no pre-scale
    TIMER32_1->CONTROL = TIMER32_CONTROL_SIZE |
            TIMER32_CONTROL_MODE;

    // Load Timer32 counter with period = 0x20000
    TIMER32_1->LOAD= 0x20000;

    // Enalbe the Timer32 interrupt in NVIC
    __enable_irq();
    NVIC->ISER[0] = 1 << ((T32_INT1_IRQn) & 31);

    // Enable sleep on exit from ISR
    SCB->SCR |= SCB_SCR_SLEEPONEXIT_Msk;

    // Start Timer32 with interrupt enabled
    TIMER32_1->CONTROL |= TIMER32_CONTROL_ENABLE |
            TIMER32_CONTROL_IE;

    // Enter LPM0;
    __sleep();

    // For the debugger when halt is asserted. This is only needed for
    // debug mode
    __no_operation();
}

void T32_INT1_IRQHandler(void)
{
    TIMER32_1->INTCLR |= BIT0;              // Clear Timer32 interrupt flag
    P1->OUT ^= BIT0;                        // Toggle P1.0 LED
}