前段时间忙着画板子搞运放搞滤波了，程序更新的少，发现MSP430不是太好用，尤其Timer，不过也与我使用内部晶振有关，产生正玄波之前用MSP430发出PWM，再进行滤波变为正弦波太麻烦了，这次改用DDS芯片，今天板子回来一会就调了出来很方便。

AD9850为一款DDS芯片，这里不做什么详细介绍了，有两种接口：serial 和 parrel，两种接口驱动均完成

1 /*

2 * AD9850.h

3 *

4 * Created on: 2013-7-12

5 * Author: Allen

6 */

7

8 #ifndef AD9850_H_

9 #define AD9850_H_

10

11 #include

12 #include "MyType.h"

13

14

15 //----------------------------------------------------------------------------------

16 //AD9850:W_CLK P2.5

17 #define AD9850_W_CLK_DIR (P2DIR)

18 #define AD9850_W_CLK_OUT (P2OUT)

19 #define AD9850_W_CLK_PIN_NUM (BIT5)

20

21 #define AD9850_W_CLK_IO_INIT (Set_Bit(P2DIR,AD9850_W_CLK_PIN_NUM))

22 #define AD9850_W_CLK_H (Set_Bit(P2OUT,AD9850_W_CLK_PIN_NUM))

23 #define AD9850_W_CLK_L (Clr_Bit(P2OUT,AD9850_W_CLK_PIN_NUM))

24

25 //----------------------------------------------------------------------------------

26 //AD9850:FQ_UP P2.4

27 #define AD9850_FQ_UP_DIR (P2DIR)

28 #define AD9850_FQ_UP_OUT (P2OUT)

29 #define AD9850_FQ_UP_PIN_NUM (BIT4)

30

31 #define AD9850_FQ_UP_IO_INIT (Set_Bit(P2DIR,AD9850_FQ_UP_PIN_NUM))

32 #define AD9850_FQ_UP_H (Set_Bit(P2OUT,AD9850_FQ_UP_PIN_NUM))

33 #define AD9850_FQ_UP_L (Clr_Bit(P2OUT,AD9850_FQ_UP_PIN_NUM))

34

35 //----------------------------------------------------------------------------------

36 //AD9850:RESET P2.3

37 #define AD9850_RESET_DIR (P2DIR)

38 #define AD9850_RESET_OUT (P2OUT)

39 #define AD9850_RESET_PIN_NUM (BIT3)

40

41 #define AD9850_RESET_IO_INIT (Set_Bit(P2DIR,AD9850_RESET_PIN_NUM))

42 #define AD9850_RESET_H (Set_Bit(P2OUT,AD9850_RESET_PIN_NUM))

43 #define AD9850_RESET_L (Clr_Bit(P2OUT,AD9850_RESET_PIN_NUM))

44

45 //----------------------------------------------------------------------------------

46 //AD9850:BIT_DATA P1.7

47 #define AD9850_BIT_DATA_DIR (P1DIR)

48 #define AD9850_BIT_DATA_OUT (P1OUT)

49 #define AD9850_BIT_DATA_PIN_NUM (BIT7)

50

51 #define AD9850_BIT_DATA_IO_INIT (Set_Bit(P1DIR,AD9850_BIT_DATA_PIN_NUM))

52 #define AD9850_BIT_DATA_H (Set_Bit(P1OUT,AD9850_BIT_DATA_PIN_NUM))

53 #define AD9850_BIT_DATA_L (Clr_Bit(P1OUT,AD9850_BIT_DATA_PIN_NUM))

54

55

56 extern void AD9850_INIT_SERIAL(void);

57

58 extern void AD9850_RESET_SERIAL(void);

59

60 extern void AD9850_WR_SERIAL(unsigned char w0,double frequence);

61

62 extern void AD9850_INIT_PARREL(void);

63

64 extern void AD9850_RESET_PARREL(void);

65

66 extern void AD9850_WR_PARREL(unsigned char w0,double frequence);

67

68

69 #endif /* LED_H_ */

以上是头文件完成了pin定义与位操作，并口的数据线操作并没定义，到时候直接用port操作很方便，AD9850的D0-D7与MSP430的P1.0-P1.7对应，一次写入8位很简单。

其中使用了#include "MyType.h"中一些操作：

// C

#define Set_Bit(val, bitn) (val |= (/*1 <

#define Clr_Bit(val, bitn) (val &= ~(/*1<

#define Get_Bit(val, bitn) (val & (1<

先写的串口的程序：

1 void AD9850_INIT_SERIAL(void)

2 {

3 AD9850_W_CLK_IO_INIT;

4 AD9850_FQ_UP_IO_INIT;

5 AD9850_RESET_IO_INIT;

6 AD9850_BIT_DATA_IO_INIT;

7 }

1 void AD9850_RESET_SERIAL(void)

2 {

3 AD9850_W_CLK_L;

4 AD9850_FQ_UP_L;

5 //rest信号

6 AD9850_RESET_L;

7 AD9850_RESET_H;

8 AD9850_RESET_L;

9 //w_clk信号

10 AD9850_W_CLK_L;

11 AD9850_W_CLK_H;

12 AD9850_W_CLK_L;

13 //fq_up信号

14 AD9850_FQ_UP_L;

15 AD9850_FQ_UP_H;

16 AD9850_FQ_UP_L;

17

18 }

1 void AD9850_WR_SERIAL(unsigned char w0,double frequence)

2 {

3 unsigned char i,w;

4 long int y;

5 double x;

6 //计算频率的HEX值

7 x=4294967295/20;//适合125M晶振

8 //如果时钟频率不为20MHZ，修改该处的频率值，单位MHz !!!

9 frequence=frequence/1000000;

10 frequence=frequence*x;

11 y=frequence;

12 //写w4数据

13 w=(y>>=0);

14 for(i=0;i<8;i++)

15 {

16 // ad9850_bit_data=(w>>i)&0x01;

17 if((w>>i)&0x01)

18 AD9850_BIT_DATA_H;

19 else

20 AD9850_BIT_DATA_L;

21 AD9850_W_CLK_H;

22 AD9850_W_CLK_L;

23 }

24 //写w3数据

25 w=(y>>8);

26 for(i=0;i<8;i++)