#include
#include
volatile unsigned int i = 0; // 中断服务子程序中所用到的全局变量, 最好定义成 volatile 型, 具体原因和用法可以参考我的其他博文介绍
void main (void)
{
WDTCTL = WDT_MDLY_0_5; // 周期 0.5ms, 设置可参考下面头文件中的截段
IE1 |= WDTIE; // 使能WDT中断
P2DIR |= BIT2; // P2.2输出
_EINT(); // 使能全局中断
for (;;)
{
LPM0; // 进入LPM0
_NOP();
}
}
// 看门狗中断服务子程序
#pragma vector=WDT_VECTOR
__interrupt void WDT_Timer_ISR(void)
{
if (i++ > 1) {
P2OUT ^= BIT2; // 取反
}
}
//==========================================================================================================================
// 相关头文件中的定义
/************************************************************
* WATCHDOG TIMER
************************************************************/
#define __MSP430_HAS_WDT__ /* Definition to show that Module is available */
#define WDTCTL_ (0x0120u) /* Watchdog Timer Control */
DEFW( WDTCTL , WDTCTL_)
/* The bit names have been prefixed with "WDT" */
#define WDTIS0 (0x0001u)
#define WDTIS1 (0x0002u)
#define WDTSSEL (0x0004u)
#define WDTCNTCL (0x0008u)
#define WDTTMSEL (0x0010u)
#define WDTNMI (0x0020u)
#define WDTNMIES (0x0040u)
#define WDTHOLD (0x0080u)
#define WDTPW (0x5A00u)
/* WDT-interval times [1ms] coded with Bits 0-2 */
/* WDT is clocked by fSMCLK (assumed 1MHz) */
#define WDT_MDLY_32 (WDTPW+WDTTMSEL+WDTCNTCL) /* 32ms interval (default) */
#define WDT_MDLY_8 (WDTPW+WDTTMSEL+WDTCNTCL+WDTIS0) /* 8ms " */
#define WDT_MDLY_0_5 (WDTPW+WDTTMSEL+WDTCNTCL+WDTIS1) /* 0.5ms " */
#define WDT_MDLY_0_064 (WDTPW+WDTTMSEL+WDTCNTCL+WDTIS1+WDTIS0) /* 0.064ms " */
/* WDT is clocked by fACLK (assumed 32KHz) */
#define WDT_ADLY_1000 (WDTPW+WDTTMSEL+WDTCNTCL+WDTSSEL) /* 1000ms " */
#define WDT_ADLY_250 (WDTPW+WDTTMSEL+WDTCNTCL+WDTSSEL+WDTIS0) /* 250ms " */
#define WDT_ADLY_16 (WDTPW+WDTTMSEL+WDTCNTCL+WDTSSEL+WDTIS1) /* 16ms " */
#define WDT_ADLY_1_9 (WDTPW+WDTTMSEL+WDTCNTCL+WDTSSEL+WDTIS1+WDTIS0) /* 1.9ms " */
/* Watchdog mode -> reset after expired time */
/* WDT is clocked by fSMCLK (assumed 1MHz) */
#define WDT_MRST_32 (WDTPW+WDTCNTCL) /* 32ms interval (default) */
#define WDT_MRST_8 (WDTPW+WDTCNTCL+WDTIS0) /* 8ms " */
#define WDT_MRST_0_5 (WDTPW+WDTCNTCL+WDTIS1) /* 0.5ms " */
#define WDT_MRST_0_064 (WDTPW+WDTCNTCL+WDTIS1+WDTIS0) /* 0.064ms " */
/* WDT is clocked by fACLK (assumed 32KHz) */
#define WDT_ARST_1000 (WDTPW+WDTCNTCL+WDTSSEL) /* 1000ms " */
#define WDT_ARST_250 (WDTPW+WDTCNTCL+WDTSSEL+WDTIS0) /* 250ms " */
#define WDT_ARST_16 (WDTPW+WDTCNTCL+WDTSSEL+WDTIS1) /* 16ms " */
#define WDT_ARST_1_9 (WDTPW+WDTCNTCL+WDTSSEL+WDTIS1+WDTIS0) /* 1.9ms " */
