msp430F413 请问喂狗语句

 你好,关于喂狗语句 ,问题如下,谢谢!
1、  MCU是msp430F413,使用外部晶振32K,看门狗定时器设为1S一次,请问喂狗语句是这句:WDT_ARST_1000,是吗?
      部分程序如下:
  WDTCTL = WDT_ADLY_1000;  //   // WDT 1 s, ACLK, interval timer
  __bis_SR_register(LPM3_bits + GIE);       // Enter LPM3 w/interrupt
  while(1)
  {
     WDT_ARST_1000;   /* 1000ms  " */
  }
2、WDT 定时设置与对应喂狗语句,是不是这样?
  (定时设置)                      (喂狗语句)
 WDT_ADLY_1000    :   WDT_ARST_1000
 WDT_ADLY_250   :    WDT_ARST_250
 WDT_ADLY_16    :    WDT_ARST_16
 WDT_ADLY_1_9  :    WDT_ARST_1_9

3 个回复

  • 1、WDT_ARST_1000是设置看门狗计时周期的语句,具体的周期时间和选用的时钟频率有关系。是2的15次方的时钟数。

    2、喂狗一般是用:WDTCTL =WDT_ARST_1000+WDTCNTCL;


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  • 回复 dirtwillfly:

    1、使用外部晶振32K,工作频率在1MHZ,

    SCFQCTL = SCFQ_1M; // 1MHZ fMCLK=32*fACLK */
    FLL_CTL0 |= XCAP14PF; // Configure load caps Set load cap for 32k xtal XIN Cap = XOUT Cap = 14pf */

    2、可以调用250mS一次来喂狗吗,?  谢谢!:WDTCTL =WDT_ARST_250+WDTCNTCL;   //250ms

  • 回复 user4385857:

    有相关例程的,您可以看一下(用WDT的定时模式来定时250ms翻转P5.1)

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    //******************************************************************************
    //  MSP-FET430P410 Demo - WDT, Toggle P5.1, Interval Overflow ISR, 32kHz ACLK
    //
    //  Description: Toggle P5.1 using WDT configured for Interval Timer mode.
    //  Interrupt toggles LED every 250ms based on 32kHz ACLK WDT clock source.
    //  ACLK = LFXT1 = 32768Hz, MCLK = SMCLK = default DCO = 32 x ACLK = 1048576Hz
    //  //* An external watch crystal between XIN & XOUT is required for ACLK *//	
    //
    //		  MSP430F413
    //             -----------------
    //         /|\|              XIN|-
    //          | |                 | 32kHz
    //          --|RST          XOUT|-
    //            |                 |
    //            |             P5.1|-->LED
    //
    //  M. Buccini
    //  Texas Instruments Inc.
    //  Feb 2005
    //  Built with CCE Version: 3.2.0 and IAR Embedded Workbench Version: 3.21A
    //*****************************************************************************
    #include <msp430.h>
    
    int main(void)
    {
      WDTCTL = WDT_ADLY_250;                    // WDT 250ms, ACLK, interval timer
      FLL_CTL0 |= XCAP14PF;                     // Configure load caps
      IE1 |= WDTIE;                             // Enable WDT interrupt
      P5DIR |= 0x02;                            // Set P5.1 to output direction
    
      __bis_SR_register(LPM3_bits + GIE);       // Enter LPM3 w/interrupt
    }
    
    // Watchdog Timer interrupt service routine
    #if defined(__TI_COMPILER_VERSION__) || defined(__IAR_SYSTEMS_ICC__)
    #pragma vector=WDT_VECTOR
    __interrupt void watchdog_timer(void)
    #elif defined(__GNUC__)
    void __attribute__ ((interrupt(WDT_VECTOR))) watchdog_timer (void)
    #else
    #error Compiler not supported!
    #endif
    {
      P5OUT ^= 0x02;                            // Toggle P5.1 using exclusive-OR
    }
    
    

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