修改自51單片機(jī)，launchpad的P10連接蜂鳴器，蜂鳴器演奏《八月桂花》

1 #include "msp430g2553.h"

2

3 unsigned char n=0; //n為節(jié)拍常數(shù)變量

4 unsigned char music_tab[] ={

5 0x18, 0x30, 0x1C , 0x10, //格式為: 頻率常數(shù), 節(jié)拍常數(shù), 頻率常數(shù), 節(jié)拍常數(shù),

6 0x20, 0x40, 0x1C , 0x10,

7 0x18, 0x10, 0x20 , 0x10,

8 0x1C, 0x10, 0x18 , 0x40,

9 0x1C, 0x20, 0x20 , 0x20,

10 0x1C, 0x20, 0x18 , 0x20,

11 0x20, 0x80, 0xFF , 0x20,

12 0x30, 0x1C, 0x10 , 0x18,

13 0x20, 0x15, 0x20 , 0x1C,

14 0x20, 0x20, 0x20 , 0x26,

15 0x40, 0x20, 0x20 , 0x2B,

16 0x20, 0x26, 0x20 , 0x20,

17 0x20, 0x30, 0x80 , 0xFF,

18 0x20, 0x20, 0x1C , 0x10,

19 0x18, 0x10, 0x20 , 0x20,

20 0x26, 0x20, 0x2B , 0x20,

21 0x30, 0x20, 0x2B , 0x40,

22 0x20, 0x20, 0x1C , 0x10,

23 0x18, 0x10, 0x20 , 0x20,

24 0x26, 0x20, 0x2B , 0x20,

25 0x30, 0x20, 0x2B , 0x40,

26 0x20, 0x30, 0x1C , 0x10,

27 0x18, 0x20, 0x15 , 0x20,

28 0x1C, 0x20, 0x20 , 0x20,

29 0x26, 0x40, 0x20 , 0x20,

30 0x2B, 0x20, 0x26 , 0x20,

31 0x20, 0x20, 0x30 , 0x80,

32 0x20, 0x30, 0x1C , 0x10,

33 0x20, 0x10, 0x1C , 0x10,

34 0x20, 0x20, 0x26 , 0x20,

35 0x2B, 0x20, 0x30 , 0x20,

36 0x2B, 0x40, 0x20 , 0x15,

37 0x1F, 0x05, 0x20 , 0x10,

38 0x1C, 0x10, 0x20 , 0x20,

39 0x26, 0x20, 0x2B , 0x20,

40 0x30, 0x20, 0x2B , 0x40,

41 0x20, 0x30, 0x1C , 0x10,

42 0x18, 0x20, 0x15 , 0x20,

43 0x1C, 0x20, 0x20 , 0x20,

44 0x26, 0x40, 0x20 , 0x20,

45 0x2B, 0x20, 0x26 , 0x20,

46 0x20, 0x20, 0x30 , 0x30,

47 0x20, 0x30, 0x1C , 0x10,

48 0x18, 0x40, 0x1C , 0x20,

49 0x20, 0x20, 0x26 , 0x40,

50 0x13, 0x60, 0x18 , 0x20,

51 0x15, 0x40, 0x13 , 0x40,

52 0x18, 0x80, 0x00

53 };

54

55

56 void delay (unsigned char m) //控制頻率延時(shí)

57 {

58 unsigned i=3*m;

59 while(--i);

60 }

61

62 void delaymms(unsigned int a) //毫秒延時(shí)子程序

63 {

64 unsigned int t;

65 while(--a)

66 for(t=0;t<200;t++);

67 }

68

69 void main(void)

70 {

71 unsigned char p,m; //m為頻率常數(shù)變量

72 unsigned char i=0;

73

74 WDTCTL = WDTPW + WDTHOLD; // 停止看門(mén)狗

75

76 P1DIR = 0Xff;

77 P2DIR = 0Xff;

78

79 CCTL0 |= CCIE; // CCR0 interrupt enabled

80 CCR0 = 10000; //10ms

81 TACTL = TASSEL_2 ; // SMCLK, contmode

82 _EINT();

83

84

85 while(1)

86 {

87 p=music_tab[i];

88 if(p==0x00)

89 {

90 i=0;

91 delaymms(1000);

92 continue;;

93 } //如果碰到結(jié)束符,延時(shí)1秒,回到開(kāi)始再來(lái)一遍

94 else if(p==0xff)

95 {

96 i=i+1;

97 delaymms(100);

98 TACTL &=~MC_1;

99 continue;

100 } //若碰到休止符,延時(shí)100ms,繼續(xù)取下一音符

101 else

102 {

103 m=music_tab[i++];

104 n=music_tab[i++];

105 } //取頻率常數(shù) 和 節(jié)拍常數(shù)

106

107 TACTL |= MC_1+TACLR; //開(kāi)定時(shí)器

108 while(n!=0) P1OUT ^= BIT0,delay(m); //等待節(jié)拍完成

109 TACTL &=~MC_1; //關(guān)定時(shí)器

110 }

111

112 }

113

114

115 // Timer A0 interrupt service routine

116 #pragma vector=TIMER0_A0_VECTOR

117 __interrupt void Timer_A (void)

118 {

119 n--;

120 }