无法退出低功耗

各位大侠救命，遇到个问题：MSP430F5438A 进入LPM3后，在定时器中断中退出低功耗，无法进入主程序，然后就只能进入定时中断程序了，好像是退出不了低功耗模式。而且这种情况是偶然出现的。与变量太多有关吗？在初始化时在一个结构体前加了__no_init，不然初始化超时重启。

Alvin Chen：

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//******************************************************************************
//MSP430x54x Demo - Enters LPM3 (ACLK = LFXT1)
//
//Description: Configure ACLK = LFXT1 and enters LPM3. Measure current.
//ACLK = LFXT1 = 32kHz, MCLK = SMCLK = default DCO
//Note: SVS(H,L) & SVM(H,L) not disabled
//
//MSP430x5438
//-----------------
///|\ |XIN|-
//||| 32kHz
//---|RSTXOUT|-
//||
//
//W. Goh
//Texas Instruments Inc.
//April 2009
//Built with CCE Version: 3.2.2 and IAR Embedded Workbench Version: 4.11B
//******************************************************************************
#include <msp430.h>int main(void)
{WDTCTL = WDTPW+WDTHOLD;// Stop WDTP7SEL |= 0x03;// Select XT1UCSCTL6 &= ~(XT1OFF);// XT1 OnUCSCTL6 |= XCAP_3;// Internal load cap// Loop until XT1,XT2 & DCO stabilizesdo{UCSCTL7 &= ~(XT2OFFG + XT1LFOFFG + XT1HFOFFG + DCOFFG);// Clear XT2,XT1,DCO fault flagsSFRIFG1 &= ~OFIFG;// Clear fault flags}while (SFRIFG1&OFIFG);// Test oscillator fault flagUCSCTL6 &= ~(XT1DRIVE_3);// Xtal is now stable, reduce drive// strengthP1OUT = 0x00;P2OUT = 0x00;P3OUT = 0x00;P4OUT = 0x00;P5OUT = 0x00;P6OUT = 0x00;P7OUT = 0x00;P8OUT = 0x00;P9OUT = 0x00;P10OUT = 0x00;P11OUT = 0x00;PJOUT = 0x00;P1DIR = 0xFF;P2DIR = 0xFF;P3DIR = 0xFF;P4DIR = 0xFF;P5DIR = 0xFF;P6DIR = 0xFF;P7DIR = 0xFF;P8DIR = 0xFF;P9DIR = 0xFF;P10DIR = 0xFF;P11DIR = 0xFF;PJDIR = 0xFF;__bis_SR_register(LPM3_bits);// Enter LPM3//可以加个延时或者用外部中断打断一下试试

LPM3_EXIT;

}

v wu：

回复 Alvin Chen:

您好，有外部中断的，也是无法退出低功耗，只能进入定时中断，您说的延时是在唤醒之前加吗？

Alvin Chen：

回复 v wu:

我说的延时是我上面那个code，就是您在进入LPM3之后加个延时在用LPM3_EXIT;

看一下这样是否可以正常退出。

v wu：

回复 Alvin Chen:

嗯嗯，我试试看，这种情况是偶尔出现，比较难验证。感谢！

v wu：

回复 Alvin Chen:

没有效果，应该不是这个原因。而且出现无法退出后，就一直退不出了，只能进入定时中断。还有别的可能吗？感谢

灰小子：

回复 v wu:

方便上传你的代码看看吗？

或者你运行一下官网的例程，看正不正常

v wu：

回复 灰小子:

void main(void)

{

   ……

__low_power_mode_3();

}

#pragma vector=TIMER0_A0_VECTOR__interrupt void Timer_A (void){

TA0CCR0 =656;

if(…)

{

__low_power_mode_off_on_exit();

}

}

#pragma vector = PORT2_VECTOR__interrupt void port2(void){

__low_power_mode_off_on_exit() ;

}

流程就是这样的，感谢