前段時(shí)間忙著畫板子搞運(yùn)放搞濾波了，程序更新的少，發(fā)現(xiàn)MSP430不是太好用，尤其Timer，不過(guò)也與我使用內(nèi)部晶振有關(guān)，產(chǎn)生正玄波之前用MSP430發(fā)出PWM，再進(jìn)行濾波變?yōu)檎也ㄌ闊┝?，這次改用DDS芯片，今天板子回來(lái)一會(huì)就調(diào)了出來(lái)很方便。

AD9850為一款DDS芯片，這里不做什么詳細(xì)介紹了，有兩種接口：serial 和 parrel，兩種接口驅(qū)動(dòng)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_ */

以上是頭文件完成了pin定義與位操作，并口的數(shù)據(jù)線操作并沒(méi)定義，到時(shí)候直接用port操作很方便，AD9850的D0-D7與MSP430的P1.0-P1.7對(duì)應(yīng)，一次寫入8位很簡(jiǎn)單。

其中使用了#include "MyType.h"中一些操作：

// C

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

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

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

先寫的串口的程序：

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信號(hào)

6 AD9850_RESET_L;

7 AD9850_RESET_H;

8 AD9850_RESET_L;

9 //w_clk信號(hào)

10 AD9850_W_CLK_L;

11 AD9850_W_CLK_H;

12 AD9850_W_CLK_L;

13 //fq_up信號(hào)

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 //計(jì)算頻率的HEX值

7 x=4294967295/20;//適合125M晶振

8 //如果時(shí)鐘頻率不為20MHZ，修改該處的頻率值，單位MHz !!!

9 frequence=frequence/1000000;

10 frequence=frequence*x;

11 y=frequence;

12 //寫w4數(shù)據(jù)

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 //寫w3數(shù)據(jù)

25 w=(y>>8);

26 for(i=0;i<8;i++)[!--empirenews.page--]

27 {

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

29 AD9850_BIT_DATA_H;

30 else

31 AD9850_BIT_DATA_L;

32 AD9850_W_CLK_H;

33 AD9850_W_CLK_L;

34 }

35 //寫w2數(shù)據(jù)

36 w=(y>>16);

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

38 {

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

40 AD9850_BIT_DATA_H;

41 else

42 AD9850_BIT_DATA_L;

43 AD9850_W_CLK_H;

44 AD9850_W_CLK_L;

45 }

46 //寫w1數(shù)據(jù)

47 w=(y>>24);

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

49 {

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

51 AD9850_BIT_DATA_H;

52 else

53 AD9850_BIT_DATA_L;

54 AD9850_W_CLK_H;

55 AD9850_W_CLK_L;

56 }

57 //寫w0數(shù)據(jù)

58 w=w0;

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

60 {

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

62 AD9850_BIT_DATA_H;

63 else

64 AD9850_BIT_DATA_L;

65 AD9850_W_CLK_H;

66 AD9850_W_CLK_L;

67 }

68 //移入始能

69 AD9850_FQ_UP_H;

70 AD9850_FQ_UP_L;

71

72 }

串行連接時(shí)候需要注意pin2-4的連接：

以下是并行部分程序：

1 void AD9850_INIT_PARREL(void)

2 {

3 AD9850_W_CLK_IO_INIT;

4 AD9850_FQ_UP_IO_INIT;

5 AD9850_RESET_IO_INIT;

6 P1DIR=0xff;

7

8 }

1 void AD9850_RESET_PARREL(void)

2 {

3 AD9850_W_CLK_L;

4 AD9850_FQ_UP_L;

5 //rest信號(hào)

6 AD9850_RESET_L;

7 AD9850_RESET_H;

8 AD9850_RESET_L;

9 }

AD9850_WR_PARREL

主函數(shù)：

1 char mode=0; //0:serial 1:parrel

2 /*

3 * main.c

4 */

5 int main(void) {

6 WDTCTL = WDTPW | WDTHOLD; // Stop watchdog timer

7

8 mode=0;

9

10 if(mode==0)

11 {

12

13 AD9850_INIT_SERIAL();

14 AD9850_RESET_SERIAL();

15 AD9850_WR_SERIAL(0,18000);

16 }

17 else if(mode==1)

18 {

19

20 AD9850_INIT_PARREL();

21 AD9850_RESET_PARREL();

22 AD9850_WR_PARREL(0,25000);

23

24 }

25

26

27

28

29

30 while(1)

31 {

32

33

34 }

35 return 0;

36 }