fet430_wdt01.c

来自「application programme for fet430 in asse」· C语言 代码 · 共 43 行

//******************************************************************************
//  MSP-FET430P430 Demo - WDT Toggle P5.1 Interval overflow ISR, DCO SMCLK
//
//  Description; Toggle P5.1 using software timed by the WDT ISR. Toggle rate
//  is approximately 31ms based on default ~ 1.084 Mhz DCO/SMCLK clock source
//  used in this example for the WDT.
//  ACLK = n/a, MCLK = SMCLK = default DCO = 32xACLK = 1.048576Mhz
//
//                MSP430FG439
//             -----------------
//         /|\|              XIN|-
//          | |                 |
//          --|RST          XOUT|-
//            |                 |
//            |             P5.1|-->LED
//
//  M.Buccini
//  Texas Instruments, Inc
//  September 2004
//  Built with CCE for MSP430 Version: 1.00
//******************************************************************************

#include "msp430xG43x.h"

__interrupt void watchdog_timer(void);         // Prototype for ISR

void main(void)
{
  WDTCTL = WDT_MDLY_32;                 // Set Watchdog Timer interval to ~31ms
  IE1 |= WDTIE;                         // Enable WDT interrupt
  P5DIR |= 0x02;                        // Set P5.1 to output direction

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

// Watchdog Timer interrupt service routine
WDT_ISR(watchdog_timer)
__interrupt void watchdog_timer(void)
{
  P5OUT ^= 0x02;                        // Toggle P5.1 using exclusive-OR
}