LaunchPad按键消抖测试，推荐定时方式
1 #include <msp430g2553.h> 2 #define TYPE 0 //0 定时 1 延时 3 void main(void) 4 { 5 WDTCTL = WDTPW + WDTHOLD; // Stop watchdog timer 6 BCSCTL1 = CALBC1_1MHZ; // Set range 7 DCOCTL = CALDCO_1MHZ; 8 9 BCSCTL2 &= ~(DIVS_3); // SMCLK = DCO = 1MHz 10 P1DIR = 0x01; // P1.0 output, else input 11 P1OUT = 0x08; // P1.4 set, else reset 12 P1REN |= 0x08; // P1.4 pullup 13 P1IE |= 0x08; // P1.4 interrupt enabled 14 P1IES |= 0x08; // P1.4 Hi/lo edge 15 P1IFG &= ~0x08; // P1.4 IFG cleared 16 17 _BIS_SR(LPM0_bits + GIE); // Enter LPM4 w/interrupt 18 19 20 } 21 22 // Port 1 interrupt service routine 23 #pragma vector=PORT1_VECTOR 24 __interrupt void Port_1(void) 25 { 26 27 # if(TYPE) 28 //---------------------------------------- 29 //延时按键消抖 30 31 volatile unsigned int i; 32 P1IFG &= ~0x08; // P1.4 IFG cleared 33 for(i=500;i>0;i--); 34 35 if(!(P1IN & 0x08)) 36 P1OUT ^= 0x01; // P1.0 = toggle 37 38 39 #else 40 //----------------------------------------- 41 //看门狗定时按键消抖 42 43 P1IFG &= ~0x08; 44 WDTCTL = WDT_MDLY_32; // Set Watchdog Timer interval to ~30ms 45 IFG1 &= ~WDTIFG; 46 IE1 |= WDTIE; 47 48 #endif 49 50 51 } 52 53 # if(!TYPE) 54 55 #pragma vector=WDT_VECTOR 56 __interrupt void watchdog_timer(void) 57 { 58 59 IE1 &= ~WDTIE; 60 IFG1 &= ~WDTIFG; /* clear interrupt flag */ 61 WDTCTL = WDTPW + WDTHOLD; 62 63 if(!(P1IN & 0x08)) 64 P1OUT ^= 0x01; // P1.0 = toggle 65 } 66 67 #endif