msp430x54x_wdt_01.c

来自「MSP430F5XXX的sample code」· C语言 代码 · 共 42 行

//******************************************************************************
//  msp430FG5438 Demo - WDT, Toggle P1.0, Interval Overflow ISR, DCO SMCLK
//
//  Description: Toggle P1.0 using software timed by the WDT ISR. Toggle rate
//  is approximately 30ms = {(default DCO 1.045MHz) / 32768} based on default 
//  DCO/SMCLK clock source used in this example for the WDT.
//  ACLK = n/a, MCLK = SMCLK = default DCO ~1.045MHz
//
//                msp430FG5438
//             -----------------
//         /|\|                 |
//          | |                 |
//          --|RST              |
//            |                 |
//            |             P1.0|-->LED
//
//   M Smertneck
//   Texas Instruments Inc.
//   April 2008
//   Built with CCEv3.2 IAR Embedded Workbench Version: 3.42A
//******************************************************************************

#include <msp430x54x.h>

void main(void)
{
  // Set Watchdog interval to ~30ms
  WDTCTL = WDT_MDLY_32;                     // WDT SMCLK Delay Interval specify                  
  SFRIE1 |= WDTIE;                          // Enable WDT interrupt
  P1DIR |= 0x01;                            // Set P1.0 to output direction

  __bis_SR_register(LPM0_bits + GIE);       // Enter LPM0 w/ interrupt
}

// Watchdog Timer interrupt service routine
#pragma vector=WDT_VECTOR
__interrupt void watchdog_timer(void)
{
  P1OUT ^= 0x01;                            // Toggle P1.0 using exclusive-OR
}