msp430x54x_rtc_03.c

来自「MSP430F5XXX的sample code」· C语言 代码 · 共 46 行

//******************************************************************************
//  msp430FG5438 Demo - Basic Timer, Toggle P1.0 Inside ISR, 32kHz ACLK
//
//  Description: Toggles P1.0 by xor'ing P1.0 inside of a RTC ISR.
//  ACLK provides the RTCPS clock source. LED toggles every 126ms.
//  ACLK = REFO = ~32768Hz, MCLK = SMCLK = default DCO = 32 x ACLK = 1048576Hz
//  	
//
//		  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)
{
  WDTCTL = WDTPW + WDTHOLD;                 // Stop WDT
  P1DIR |= 0x01;                            // Set P1.0 as output
  RTCCTL01 = RTCTEV_3;
  RTCPS0CTL = RT0PSDIV_7;                   // Set RTPS0 to /256
  RTCPS1CTL = RT1IP_2 + RT1PSIE + RT1SSEL_3;// Set RT1IP to /4, enable
                                            // RT1PS interrupt and select
                                            // RTOPS output as clock
  _BIS_SR(LPM3_bits + GIE);                 // Enter LPM3, enable interrupts
}

// Basic Timer Interrupt Service Routine
#pragma vector=RTC_VECTOR
__interrupt void RTC_ISR(void)
{
  P1OUT ^= 0x01;                            // Toggle P1.0
  RTCCTL01 &= ~RTCTEVIFG;
  RTCPS1CTL &= ~RT1PSIFG;
}