MSP430F5529计时器中断问题

想用timerA_0的比较模式实现pwm，从而实现单周期的短脉冲。首先设定MCLK与SMCLK时钟均为DCO频率25MHz。其次，利用TA0CCR0=25000，TA0CCR1=24999，以及TA0CCTL1 = OUTMOD_3实现set/reset输出。于此同时，程序让LED灯闪烁。另外设置了TAIE中断使能，测试起见，中断处理函数没写内容，但程序跑了结果LED灯并没有闪烁，而且调试发现程序在中断处理函数中死循环，请问是何原因，多谢！！！

#include <msp430.h>				


/**
 * blink.c
 */


void main(void)
{
	WDTCTL = WDTPW | WDTHOLD;		// stop watchdog timer
	P1SEL |= BIT2;
	P1DIR |= BIT2;// P1.2 -> TA0.1
	P1DIR |= BIT0;					// P1.0 as output (LED)

	setupDCO();

	P1OUT = 0x0000;

	// set timer A
	TA0CCTL1 = OUTMOD_3;// CCR1 set/reset
	TA0CCR1 = 24999;
	TA0CCR0 = 25000;
	TA0CTL = TAIE | TASSEL_2 | MC_2 | TACLR;// SMCLK, continue mode, clear TAR
	__delay_cycles(100);

	__enable_interrupt();
	_BIS_SR(GIE);// Enter LPM0 w/ interrupt

	while(1)
	{P1OUT = 0x0001;__delay_cycles(2500000);P1OUT = 0x0000;__delay_cycles(12500000);//TA0CTL = TAIE | TASSEL_2 | MC_2 | TACLR;
	}
}

// Timer A0 interrupt service routine
#pragma vector=TIMER0_A0_VECTOR
__interrupt void TIMER0_A0_ISR(void)
{

}


void SetVCoreUp (unsigned int level)
{// Open PMM registers for write accessPMMCTL0_H = 0xA5;// Set SVS/SVM high side new levelSVSMHCTL = SVSHE + SVSHRVL0 * level + SVMHE + SVSMHRRL0 * level;// Set SVM low side to new levelSVSMLCTL = SVSLE + SVMLE + SVSMLRRL0 * level;// Wait till SVM is settledwhile ((PMMIFG & SVSMLDLYIFG) == 0);// Clear already set flagsPMMIFG &= ~(SVMLVLRIFG + SVMLIFG);// Set VCore to new levelPMMCTL0_L = PMMCOREV0 * level;// Wait till new level reachedif ((PMMIFG & SVMLIFG))while ((PMMIFG & SVMLVLRIFG) == 0);// Set SVS/SVM low side to new levelSVSMLCTL = SVSLE + SVSLRVL0 * level + SVMLE + SVSMLRRL0 * level;// Lock PMM registers for write accessPMMCTL0_H = 0x00;
}

void setupDCO(void)
{/* Power settings */SetVCoreUp(1u);SetVCoreUp(2u);SetVCoreUp(3u);UCSCTL3 = SELREF__REFOCLK;// select REFO as FLL sourceUCSCTL6 = XT1OFF | XT2OFF;// turn off XT1 and XT2/* Initialize DCO to 25.00MHz */__bis_SR_register(SCG0);// Disable the FLL control loopUCSCTL0 = 0x0000u;// Set lowest possible DCOx, MODxUCSCTL1 = DCORSEL_6;// Set RSELx for DCO = 50 MHzUCSCTL2 = 762u;// Set DCO Multiplier for 25MHz// (N + 1) * FLLRef = Fdco// (762 + 1) * 32768 = 25.00MHzUCSCTL4 = SELA__REFOCLK | SELS__DCOCLK | SELM__DCOCLK;__bic_SR_register(SCG0);// Enable the FLL control loop// Worst-case settling time for the DCO when the DCO range bits have been// changed is n x 32 x 32 x f_MCLK / f_FLL_reference. See UCS chapter in 5xx// UG for optimization.// 32*32*25MHz/32768Hz = 781250 = MCLK cycles for DCO to settle__delay_cycles(781250u);/* Loop until XT1,XT2 & DCO fault flag is cleared */do{UCSCTL7 &= ~(XT2OFFG + XT1LFOFFG  + DCOFFG);// Clear XT2,XT1,DCO fault flagsSFRIFG1 &= ~OFIFG;// Clear fault flags}while (SFRIFG1&OFIFG);// Test oscillator fault flag


}

gaoyang9992006：

中断里是不是要清理标志，不然就是一直卡在中断函数，就是这样的。

灰小子：

建议参考下官网提供的pwm例程，在例程的基础上修改

Hao Mengzhen：

要写中断处理函数的