无法退出低功耗

/* --COPYRIGHT--,BSD_EX
 * Copyright (c) 2012, Texas Instruments Incorporated
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * *  Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 *
 * *  Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * *  Neither the name of Texas Instruments Incorporated nor the names of
 *    its contributors may be used to endorse or promote products derived
 *    from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
 * EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 *******************************************************************************
 * 
 *                       MSP430 CODE EXAMPLE DISCLAIMER
 *
 * MSP430 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/grace for a GUI- and www.ti.com/msp430ware
 * for an API functional library-approach to peripheral configuration.
 *
 * --/COPYRIGHT--*/
//******************************************************************************
//   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
//         ---|RST          XOUT|-
//            |                 |
//
//   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 WDT

  P7SEL |= 0x03;                            // Select XT1
  UCSCTL6 &= ~(XT1OFF);                     // XT1 On
  UCSCTL6 |= XCAP_3;                        // Internal load cap

  // Loop until XT1,XT2 & DCO stabilizes
  do
  {
    UCSCTL7 &= ~(XT2OFFG + XT1LFOFFG + XT1HFOFFG + DCOFFG);
                                            // Clear XT2,XT1,DCO fault flags
    SFRIFG1 &= ~OFIFG;                      // Clear fault flags
  }while (SFRIFG1&OFIFG);                   // Test oscillator fault flag

  UCSCTL6 &= ~(XT1DRIVE_3);                 // Xtal is now stable, reduce drive
                                            // strength

  P1OUT = 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;

}

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？

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。

嗯嗯，我试试看，这种情况是偶尔出现，比较难验证。感谢！

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

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