LaunchPad按鍵消抖測試，推薦定時方式

1 #include

2 #define TYPE 0 //0 定時 1 延時

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 //延時按鍵消抖

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 //看門狗定時按鍵消抖

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